Applicable Document 3.1 - 8865376_01_-TR-317 TRS.pdf

UNCLASSIFIED

53711-8865376

CAGE CODE 50225

06 July 2020

SCREENING

TECHNICAL REPAIR STANDARD (TRS)

FOR

TR-317B/C/D TRANSDUCER

WARNING: This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C. Section 2751, et seq.) or the

Export Administration Act Of 1979 (Title 50, U.S.C., App. 2401 et seq.), as amended. Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with provisions of DoD Directive 5230.25.

Distribution Statement D: Distribution authorized to the Department of

Defense and U.S. DoD contractors only: Critical Technology; 23 November

1998. Other requests for this document shall be referred to: Naval Undersea

Warfare Center Newport Division, Newport, RI. Code 1535.

06 July 2020 i

UNCLASSIFIED - FOR OFFICIAL USE ONLY

SCREENING

TECHNICAL REPAIR STANDARD (TRS)

FOR

TR-317B/C/D TRANSDUCER

ECP # SCN REV DATE DESCRIPTION OF CHANGE APPROVED

4220NE031 - 2020-Jul-06 Initial Release J. Thacker

06 July 2020 ii

Table of Contents

Section Title Page No.

1. INTRODUCTION

1.1 SCOPE

1.2 CLASSIFIED INFORMATION

1.3 Forms and Documentation

2. FUNCTIONAL DESCRIPTION

2.1 INTRODUCTION

2.2 EQUIPMENT USE

2.3 EQUIPMENT DESCRIPTION

2.4 PHYSICAL DIMENSION AND WEIGHT

3. TEST EQUIPMENT, TOOLS, AND MATERIAL

3.1 TEST EQUIPMENT

3.2 TOOLS

3.3 MATERIAL

4. REPAIRABILITY

4.1 INTRODUCTION

4.2 EPOXY COATING REPAIR

4.3 RUBBER COATING REPAIR WITH PRC-944F

5. SCREENING PROCESS

5.1 INTRODUCTION

5.2 REJECTED TRANSDUCERS

5.3 CABLE CONNECTOR REMNANT REMOVAL

5.4 TRANSDUCER CLEANING

5.5 METHOD 1: WET TECH CLEANING (Reference 2)

5.6 METHOD 2: WATER TROUGH CLEANING

5.7 TRANSDUCER VISUAL INSPECTIONS

5.7.1 HEAD MASS ASSEMBLY VISUAL INSPECTION

5.7.2 TRANSDUCER HOUSING VISUAL INSPECTION

5.7.3 TRANSDUCER END SEAL ASSEMBLY VISUAL INSPECTION

5.7.4 TRANSDUCER RUBBER DRY ROT INSPECTION

6. TRANSDUCER ELECTRICAL BENCH TESTING

6.1 DC RESISTANCE TEST

6.2 CAPACITANCE AND DISSIPATION FACTOR TEST

6.3 POLARITY TEST

6.4 TEST RESULTS

7. TRANSDUCER REPAIRS AND PRE-HYDRO VISUAL INSPECTION

8. TRANSDUCER FINAL ACCEPTANCE TESTING

8.1 HYDROSTATIC PRESSURE TEST

8.2 ACOUSTIC TESTING

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8.2.1 SAPM TESTING

8.2.2 Resonant Frequency

8.2.3 Impedance Magnitude and Impedance Phase Angle

8.2.4 Transmitting Power Response

8.2.5 Receiving Measurements

8.2.6 Acoustic Test Failure

9. TRANSDUCER FINAL VISUAL INSPECTION, CERTIFICATION, AND

PACKAGING

9.1 FINAL VISUAL INSPECTION

9.2 TRANSDUCER CERTIFICATION

9.3 TRANSDUCER PACKAGING

List of Figures

Figure No. Description Page No.

Figure 1 Repairable area of Transducer Face

Figure 2 Profile view of a properly excavated and prepared defect Figure 3 Repairable shaded area of Transducer Face

Figure 4 Shroud skirt 5/8” shaded bonding area Figure 5 End seal skirt 5/8” shaded bonding area Figure 6 Transducer End Seal Connector Insert Sealing Surfaces

Figure 7 Photograph of acceptable superficial rubber “spider webbing” Figure 8 Transmitting Power Response Upper and Lower Limits

Figure 9 TR-317D Free Field Voltage Sensitivity Upper and Lower Limits

List of Tables

Table No. Description Page No

Table 1 Confidential Parameters Table 2 National Stock and Part Number Table 3 Test Equipment Table 4 Tools Table 5 Material

Table 6 Inspection, Repair, and Rejection Criteria for the Transducer Face

Table 7 Inspection, repair, and rejection criteria for the transducer shroud and skirt

Table 8 Inspection, repair, and rejection criteria for the transducer head mass ferrules Table 9 Inspection, repair, and rejection criteria for the epoxy coated housing Table 10 Inspection, repair, and rejection criteria for the rubber coated housing Table 11 Inspection, repair, and rejection criteria for the transducer end seal and skirt Table 12 Inspection & Rejection Criteria for the Transducer End Seal Connector Insert . 24

Table 13 Inspection Criteria for Transducer Dry Rot Table 14 DC Bench Testing Requirements

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List of Tables (Continued)

Table 15 Capacitance and Dissipation Factor Testing Requirements Table 16 Polarity Testing Requirements

Table 17 Hydrostatic Pressure Test Sequence

Table 18 Free-Field Performance Requirements at 3 2 C, 75 ± 5 psi

Table 19 Transmitting Power Response 3 2 C, 75 ± 5 psi

Table 20 Free Field Voltage Sensitivity Requirements at 3 2 C, 75 ± 5 psi

List of Appendices, Figures and Tables

Appendix No. Description Page No.

Appendix A Required Forms and Documentation for Screening Process ........................ A-1

Figure A- 1 TR-317 Restoration Screening Worksheet_1 ................................................ A-3 Figure A- 2 TR-317 Restoration Screening Worksheet_2 ................................................ A-4

Figure A- 3 TR-317 Rejection Sheet ................................................................................ A-5 Figure A- 4 Sonar Transducer Acceptance Test Report ................................................... A-6 Figure A- 5 Transducer/Hydrophone Certification Card .................................................. A-7

Figure A- 6 Shipping Label Sample ................................................................................. A-8

Appendix B Spanner Wrench Drawing ............................................................................ B-1 Figure B- 1 TR-317B Spanner Wrench ............................................................................ B-2

Appendix C - Quick Reference Table for the Tools and Sanding Accessories ................ C-1

LIST OF REFERENCES

1 .NAVSEA 53711-8192758/(U) (Revision G). Critical Item Performance

Specification for the TR-317D Sonar Transducer. Naval Undersea Warfare Center

Newport Division, Newport, RI (Code 1535), 13 July 2017.

2. Wet Technologies

Wet Blasting Slurry and High Pressure

Closed Loop System

Phone: 631-285-7285

3. RFD No. 3820ND011 “TR-317B/C/D TRF CIPS Changes” Approved 20200506

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1. INTRODUCTION

This manual contains the screening requirements for the TR-317B/C/D transducers.

1.1 SCOPE

This TRS provides instructions to perform the following processes on F condition

(Unserviceable Repairable) transducers:

1. Screen the transducers for physical defects.

2. Perform minimal repairs to the transducer

3. Perform electrical bench tests for screening purposes

4. Perform hydrostatic pressure tests on transducers that passed the visual screening process and electrical tests.

5. Perform in-water acoustic tests

Transducers that pass the above operational requirements will be returned to the Supply system in “A” (ready for issue) condition. Transducers that do not pass these tests will either be returned to the supply system as Condition H (Scrap) or Condition G (End Seal

Repair).

1.2 CLASSIFIED INFORMATION

This TRS establishes the performance, manufacture, test and acceptance requirements of the TR-317B/C/D Transducers. The confidential values for the parameters used throughout this document are defined in Appendix A of reference 1. Table 1 identifies confidential parameters.

Table 1 Confidential Parameters

Parameter Description Units

Fo Frequency Hz

Frw Resonant Frequency Hz

Po Max Operating Pressure Psig

Pmax Max Non-Operating Pressure Psig

PWo Drive Level Watts

FFVSo Free Field Voltage Sensitivity dB//V/uPa

SPLo Sound Pressure Level @ 1 meter dB//uPa @ 1 meter

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1.3 FORMS AND DOCUMENTATION

Examples of paperwork that could be used during the restoration process have been attached in Appendix A.

SERIALIZATION OF RESTORED TRANSDUCERS

Due to local procedures for SUBSAFE and Level 1 controls, TR-317B/C/D serial numbers must reflect the actual serial number stamped on the transducer’s rubber/epoxy housing.

All transducers shall have an IDENTIFICATION LABEL attached to the transducer housing (figure A-6) and covered with Mylar

No new serial number will be assigned after restoration unless a serial number cannot be identified either from the housing or on the side of the head mass assembly.

In the event the old serial number is no longer legible on either the housing or head mass assembly, a new serial number will be assigned as follows: CP-YR-XXX

Where CP = Contractor Transducer Repair Facility

YR = Last two digits of the current calendar year

XXX = Chronological numbering beginning with 001 for each new year.

When a transducer conversion or upgrade creates a new serialized refurbished transducer, the serial number assignments shall conform to the new serial number requirements stated above.

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2. FUNCTIONAL DESCRIPTION

2.1 INTRODUCTION.

This section describes the use, physical makeup, and significant design features of the

TR-317B/C/D.

2.2 EQUIPMENT USE.

The TR-317B/C/D is used by mainframe Sonar Systems such as the AN/BQQ-5, AN/BQQ-10 and AN/BSY-1 for the Spherical Array on submarines. The array is capable of transmitting and receiving acoustic signals.

2.3 EQUIPMENT DESCRIPTION.

The TR-317B/C/D is a double mass loaded longitudinal vibrator. It is parallel tuned in the transmit mode and series tuned in the receive mode by means of switching diodes and an autotransformer. The TR-317B/C/D transducer is composed of a primary element assembly, lower assembly and plug assembly. The main purpose of the primary element assembly is to convert electrical energy into acoustic energy in the transmit mode and to convert acoustic energy into electrical energy in the receive mode. The TR-317B/BQ is stocked in two configurations: epoxy coated and rubber coated.

2.4 PHYSICAL DIMENSION AND WEIGHT.

Item Description

System (s): AN/BQQ-5, AN/BSY-1, AN/BQQ-10

Height: 21 inches

Weight: 54 lbs.

Housing Diameter: 5 inches

Head Mass Dimensions: 7.75 X 5.5 inches

Housing:

Housing:

TR-317B Epoxy Coated (Green)

TR-317B/C/D Rubber Coated

End Seal: 4 inch O.D. Hollow Cylinder

Cable Attachment: Threaded coupling

Table 2 National Stock and Part Number.

Transducer National Stock Number NSN

TR-317B Epoxy Coated 2F 5845-01-188-7303 5845-01-188-7303

TR-317B Rubber Coated 2F 5845-01-277-8641 5845-01-277-8641

TR-317C Rubber Coated 2F 5845-01-277-8642 5845-01-277-8642

TR-317D Rubber Coated 2F 5845-01-548-3114 5845-01-548-3114

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3. TEST EQUIPMENT, TOOLS, AND MATERIAL

3.1 TEST EQUIPMENT.

Table 3 Test Equipment

Test Equipment Type Used For…

Megohmmeter GENRAD 1863 or equivalent Insulation resistance testing

LCR Meter ESI 252 Capacitance/Dissipation factor testing

Multimeter Simpson 260 Series or equivalent DC resistance testing

Null Meter Keithley 155 or equivalent Polarity testing

3.2 TOOLS.

Table 4 Tools

Tool Type Used For…

Mounting Bracket P/N 01916-003; NSN

5845-01-173-7993

Ferrule alignment inspection

12 Foot Test Cable Test cables must meet an Insulation Resistance of ≥ 100 M ohms across each lead made from

Part Number 5516975

Bench Testing

Test Cable Test cables must meet an Insulation Resistance of ≥ 100 M ohms across each lead made from

Part Number 5516975

Transducer hydrostatic pressure testing and acoustic testing

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3.3 MATERIAL.

Table 5 Material

TRS

Item # Description/Part Number (P/N) NSN General Use

1 Protective Cover P/N 5516989

TRF

manufactured

Protection for acoustic face

2 Scotchkote 323 8040-LL-N04-

Epoxy repairs

3 Seam Filler P/N PRC-944F 8010-01-224-

Rubber repairs

4 Isopropyl Alcohol P/N 2200200 6810-00-753-

Cleaning various transducer surfaces

5 Lint Free Wipes P/N SPI #05091-

MA

N/A Cleaning various transducer surfaces

6 Acetone P/N 1B464 6810-00-753-

Cleaning end seal skirt bonding surfaces

7 Plastic Dust Cap P/N MS90376-

28R

N/A Protect receptacle threads

8 Bacteriostat detergent P/N A-A-

6840-00-935-

Cleaning TR-317B/C/D transducers

9 Mylar Sheet 9330-01-358-

Used to adhere and protect the

IDENTIFICATION LABEL

(Appendix A) to a restored transducer

10 Simple Green 7930-01-373-

Cleaning TR-317B/C/D transducers

11 Fusor 305 P/N Fusor 305 8040-LL-N04-

End seal skirt bonding

12 Shipping Container P/N 7634131 NA Final packaging

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4. REPAIRABILITY

4.1 INTRODUCTION.

This section describes the repair procedures for the TR-317B/C/D transducer. The level of repair and disassembly required for transducer restoration will be determined by the screening procedures of Section 5.

WARNING

The TR-317B, TR-317C and/or TR-317D transducer rubber coatings may contain lead oxide (red lead). Therefore, all TR-317B/C/D transducers shall be handled with appropriate safety precautions as if they contain lead, regardless of origin, batch, or actual composition. Work involving simple handling of TR-317B/C/D transducers requires the use of good hygiene practices to prevent skin contact and potential ingestion. Use of disposable gloves is recommended.

4.2 EPOXY COATING REPAIR.

Repair defects to the epoxy coated transducer housing assembly using Scotchkote 323 (pc 2 in Table 5 Material) in accordance with the following repair procedures.

Wear vinyl gloves when working with Scotchkote 323.

1. Inspect the entire transducer in accordance with paragraph 5.7 to ensure that all repairable defects have been identified and no non-repairable defects exist.

2. Thoroughly clean and degrease all surfaces to which the epoxy repair compound is to be applied. Abrade the patch area and thoroughly clean all abrasion debris from the patch area. Make certain surfaces are dry and the temperature is 41º F or above.

3. Apply the Scotchkote 323 using a small, flat piece of flexible plastic to the area to be patched. Cover the area completely, but not excessively, to allow for shaping the patch. Wipe off excess material using a cloth dampened with a solvent such as acetone.

4. As the patch begins to gel (a process taking about 20 minutes) use a knife to carefully

06 July 2020 cut and/or scrape away excess material to conform to the original shape of the transducer housing as required.

5. Allow 24 hours for the epoxy patch to fully cure.

4.3 RUBBER COATING REPAIR WITH PRC-944F

Repair defects to the rubber-covered housing, end seal assembly and the head mass assembly in accordance with the following procedure. Repairs shall be made using PRC-944F Seam

Filler (pc 3 Table 5 Material).

Wear vinyl gloves when working with PRC-944F.

CAUTION

Repairs are allowed to the transducer face only in the shaded area shown in Figure 1.

Any repair outside of this shaded area (e.g. application of PRC-944F, grinding actions, etc.) will result in the transducer being rejected. Proper care should be taken to avoid “over-repairing”.

Figure 1 Repairable area of Transducer Face

06 July 2020

To obtain good results, these materials must be handled carefully and patiently. Proper time must be allowed for each step of application. Cleanliness is especially important at all times.

NOTE

It is important to work quickly after the PRC-944F has been mixed to ensure that it does not begin to cure prior to application to the transducer as this can result in improper adhesion.

In the case of very fine defects, it may be possible to “buff” out the defects during the sanding process such that the resulting area meets the visual inspection requirements of paragraph 4.7. If a defect is “buffed” out, it is not required to be filled with PRC-944F so long as the “buffed” defect meets the requirements of paragraph 5.7.

1. Inspect the entire transducer in accordance with paragraph 5.7 to ensure that all reparable defects have been identified and no non-reparable defects exist.

2. Refer to Appendix C for a quick reference sheet for the sanding and grinding tools required to perform PRC-944F repairs. Appendix C also provides recommended rotary tool speeds.

3. Using Appendix C as a reference for tool requirements, prepare defects to be repaired by excavating the defect as necessary. Ensure the profile of the defect excavation resembles that shown in Figure 2 (left) to ensure proper adhesion of the PRC-944F. Take care not to enlarge the defect more than is necessary to provide the profile shown in Figure 2 (right).

Figure 2 Profile view of a properly excavated and prepared defect

4. For clarity, identify all prepared defects with a grease pencil to ensure that all defects are repaired.

5. As required, mask off areas of the transducer which should not have rubber applied such as the unrepairable area of the face shown in Figure 1.

6. Use isopropyl alcohol (pc 4 Table 5 Material) and a lint free cloth to clean the

06 July 2020 ground out areas. Ensure there is no dust or debris on the area where new rubber will be applied.

7. Prior to mixing the rubber, review the unit to be repaired to ensure all repairs have been properly prepared and that the transducer is positioned optimally to ensure that the repair process can be performed quickly.

8. Mix the PRC-944F using the SEMKIT TWO-PART MATERIAL

CARTRIDGE BARRIER TYPE MIXING INSTRUCTIONS below.

A. Safety glasses shall be worn during the mixing process.

B. Hold cartridge, grasp dasher rod and pull back enough to clear the clinch band (approximately ½").

C. Remove clinch band. To prevent mess, stick clinch band marker tape onto the old rubber tube sleeve.

D. Depress cartridge in the area of the clinch band to deform foil barrier.

E. Push dasher rod down to plunger, to remove foil from mixing area.

F. Use the mixer and mix the material for 3 minutes. When mixing, do not operate the machine in reverse direction. This will unscrew the rod.

1. Screw the plastic rod onto the bottom screw by hand to ensure a good fit. The large pin must face out towards the user when the small pins are locked into place.

2. Turn the power switch man/auto down to automatic. Rotate the timer knob clockwise to turn the rotator on. Do not use the timer function.

A standalone timer will be used.

3. When finished, put the machine in reverse and hold the plastic rod to get rod unscrewed from machine.

G. Remove the Semkit from the mixer.

H. Remove the bottom cap.

I. Pull dasher rod back to neck of cartridge, grasp cartridge firmly at neck, unscrew dasher rod and remove. To prevent mess, put rod pieces into old sleeve that rubber tube was in.

J. Screw the nozzle into the cartridge and insert into the Semco Extrusion

Gun and use as required.

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9. Remove air bubbles from the mixed rubber by squirting a little bit onto a paper towel. After the initial bleed, reduce the air pressure on the gun to avoid an uncontrolled release of material.

10. Apply the rubber to each excavated defect in one continuous bead of rubber in a back and forth motion, overlapping slightly with each pass. Only over-apply as much as one tip-width all around the defect. Avoid excessive overfills as this will require additional time to sand.

11. Stretch a clean square of plastic and press gently onto the wet rubber. Do not press the plastic too hard. Ensure there will be about 1/16” to 1/4" of rubber protruding from the repair. Leave the plastic in place until the rubber cures.

12. After all defects have been filled, remove any masking tape used while the rubber is still wet.

13. Ensure the rubber fill date and rubber cure date (one week from the rubber fill date) is annotated for the transducer. A temporary sign hanging off the transducer may be used.

14. The rubber shall cure for at least 1 week prior to sanding operations.

15. Once the rubber has fully cured (1 week) “fair” (i.e. smooth the rubber repair surface with the surrounding material) the rubber repairs with the surrounding material. Refer to Appendix C for fairing tool requirements. Use a grinding tool to remove excess rubber until the defect is very close, but still beyond

(about 1/16” to 1/32”), the final contour needed. Finish the fairing using sanding tools. Only sand new rubber. Avoid over sanding the defect. If sanding extends into a non-repairable rubber surface, the unit will be rejected.

16. Ensure the finished repairs have no bubbles, pits, voids, loose flaps, cracks, or any evidence of improper bonding at the seam between the new and existing rubber.

5. SCREENING PROCESS

5.1 INTRODUCTION.

This section contains the requirements for screening the TR-317B/C/D transducer. The screening process is designed to identify and perform the level of disassembly and repair needed to make TR-317B/C/D transducers ready for issue (RFI). Further, this process defines transducer characteristics which may be un-repairable and how to disposition these units. On-site engineering will be consulted for any transducer deemed un-repairable prior to being sent to Supply in the prescribed condition code. The screening process is broken down into the following procedures:

06 July 2020

1. Cleaning and Visual inspections

2. Electrical bench tests

a. DC Resistance

b. Capacitance and Dissipation Factor

c. Polarity Test

3. Hydrostatic Pressure tests

4. Acoustic tests

5. Final Visual Inspections and Packaging

This TRS is specifically tailored to TR-317B/C/D transducers. Upon initial receipt from Supply, verify that the TR-317 is a type “B, C or D”. If not (e.g. TR-317 or TR-

317A), contact NUWC/NPT for disposition instructions for the mislabeled transducers.

During the screening process, a transducer may be found to be rejectable/unrepairable in accordance with the instructions of this TRS. Upon the discovery of any non-repairable “H” condition defect, further inspections are no longer required and the transducer may be dispositioned as “H” condition. If a transducer exhibits non-repairable “G” condition defects (damage to end seal), the transducer must pass electrical bench testing prior to being identified and dispositioned as “G” condition.

Keep the protective cover on the face of the TR-317B/C/D transducer at all times during the screening process. Only remove the cover temporarily as required to perform inspections, repair, or testing.

If a TR-317B/C/D is received with Level 1 material (such as a hull penetrator and/or hex nut) still attached immediately contact NUWC/NPT for handling instructions.

5.2 REJECTED TRANSDUCERS

During the process of screening, a transducer may be rejected due to non-repairable defects or test failures. Use the TR-317 Rejection Sheet (Appendix A) to annotate the type of failure and its location. All failures shall be confirmed with on-site engineering. The failures will be packaged and returned to the supply system in the prescribed condition code in accordance with local shipping requirements. In the case of “G” condition failures related to the end seal, the transducers will be dispositioned to the supply system.

06 July 2020

5.3 CABLE CONNECTOR REMNANT REMOVAL

Perform the removal of cable connector remnants in accordance with the following procedure on the received TR-317B/C/D transducers to prepare them for cleaning and inspection.

1. Spray a small amount of Simple Green on the cable connector remnant and brass ring.

2. Wait 10 minutes for the Simple Green to penetrate and loosen up any sea-growth.

3. Position the transducer vertically underneath a fume collection hood. This will allow for the safe collection and transfer of SF-6 gas if a connector “pops” during separation. The contractor shall follow local state guidelines on handling of SF-6 gas.

4. Utilize the TR-317B Spanner Wrench (Figure B-1) to loosen the brass ring and remove the cable connector remnant.

5. If the cable connector remnant was successfully removed, forward the transducer on for cleaning and further inspection. If a connector “pops” during separation, use TR-317 Rejection Sheet (Appendix A) to annotate the failure and disposition the transducer in “H” condition.

5.4 TRANSDUCER CLEANING

Perform transducer cleaning in accordance with the following procedures on the received

TR-317B/C/D transducers and prepare them for inspection. The two methods that may be used are the Wet Tech Cleaning or the Water Trough Cleaning procedures.

The following cleaning procedures may utilize or generate hazardous material or hazardous waste. Follow local procedures for protecting against and disposing of hazardous material and/or hazardous waste.

06 July 2020

5.5 METHOD 1: WET TECH CLEANING (Reference 2)

Handle the transducer carefully during the cleaning process because the external surfaces are susceptible to damage. When placing the transducer in the WET

TECH cleaning system, always position it so that it will not fall or be knocked over.

1. Remove the protective cover from the molded head mass assembly (if present).

2. Cover the transducer receptacle with a protective waterproof cap or thread on a spare transducer cable section to prevent water from entering the receptacle during cleaning.

3. Place the transducer into the WET TECH cleaning system and wash in accordance with shop practice and the manufacturer’s instructions. Take caution when using this cleaning system. Do not direct any high-pressure blast at the transducer face and ensure the receptacle remains protected during cleaning.

4. Remove the transducer from the cleaning system, ensure the end seal has been drained from any excess water, and place it on a clean dry surface.

5. Dry the transducer with a clean dry cloth.

6. Remove the receptacle protective cap/cable and thoroughly clean the connector insert with isopropyl alcohol and a lint free cloth.

7. Attach/reattach the transducer face protective cover.

5.6 METHOD 2: WATER TROUGH CLEANING

Handle the transducer carefully during the cleaning process because the external surfaces are susceptible to damage. When placing the transducer in the trough, always position it such a way that it cannot fall or be knocked over.

1. Obtain a trough of suitable size to allow submerging of the transducer. Fill with a detergent solution containing 1 ounce of detergent (pc 8 table 5) to 3 gallons of fresh water. (Multiple transducers may be cleaned at once if desired.)

06 July 2020

2. Remove the protective cover from the molded head mass assembly (if present).

3. Carefully place the transducer in the bath of mild detergent and let soak for as long as is required to break free dirt and other fouling material. For best results, let the transducer soak overnight.

4. Use rags or a soft bristled brush to clean all exterior surfaces of the transducer.

5. Remove the transducer from the bath and thoroughly rinse with fresh water.

Drain any excess water from the end seal.

6. Place the transducer on a clean dry surface and dry the transducer with a clean dry cloth.

7. Remove the receptacle protective cap/cable and thoroughly clean the connector insert with isopropyl alcohol and a lint free cloth.

8. Attach/reattach the transducer face protective cover

5.7 TRANSDUCER VISUAL INSPECTIONS.

The entire exterior surface of the transducer shall be inspected to assess any visible signs of damage and to determine whether repairs are feasible. Inspections shall be conducted in the following sequence: head mass assembly, epoxy/rubber coated transducer housing assembly and finally the end seal assembly. In addition to being inspected for reparable damage, all rubber transducer surfaces will be inspected for dry rot. The dry rot inspection may be performed at the same time as the damage inspections for each surface. Repairs, if required, shall be annotated on the applicable TR-317 RESTORATION SCREENING SHEET

(Appendix A).

Debonded areas are defined as areas where the rubber coating is not bonded to the underlying metal.

Swollen bubbles are defined as the presence of any gas between the rubber coating and underlying metal that project beyond the original contour.

06 July 2020

5.7.1 HEAD MASS ASSEMBLY VISUAL INSPECTION

The following procedure provides instructions and requirements for visual inspection of the rubber molded head mass assembly, which includes the face, shroud, and metal ferrules.

1. Remove the protective cover from the molded head mass assembly.

2. Using a bright light, inspect the face of the transducer for defects. With a grease pencil, mark defects which require repair or are deemed non-repairable as required. Do not mark defects which don’t require repair. See Table 6 for a summary and definition of satisfactory, repairable, and non-repairable defects. For non-repairable defects, use the rejection instructions shown in

Table 6. Satisfactory defects which do not require repair shall be left as is; no repairs will be performed on them.

3. Reinstall the protective cover.

Table 6 Inspection, Repair, and Rejection Criteria for the Transducer Face

Satisfactory defects which will not be repaired

Unsatisfactory defects which require repair

Unsatisfactory defects which cannot be repaired

Description of defect

Rejection instructions

Cuts or depressions shallower than

1/16” anywhere on the transducer face regardless of length and width

Cuts or depressions that are between

1/16” and 1/4" deep regardless of length or width that lie in the shaded region of the rubber face as shown in Figure 3.

Cuts or depressions in the transducer face deeper than

1/16” that lie in the unshaded region shown in Figure 3.

Reject to “H” condition; no further transducer inspection required

Cuts or depressions in the transducer face deeper than 1/4" that lie in the shaded region shown in

Figure 3.

Reject to “H” condition; no further transducer inspection required

Repair actions

(grinding, rubber repair) performed in the unshaded region shown in Figure 3.

Reject to “H” condition; no further transducer inspection required

06 July 2020

Figure 3 Repairable shaded area of Transducer Face

4. Inspect the head mass shroud and shroud skirt for rubber defects. With a grease pencil, mark defects which require repair or are deemed non-repairable as required. Do not mark defects which don’t require repair. See Table 7 for a summary and definition of satisfactory, repairable, and non-repairable defects. For non-repairable defects, use the rejection instructions shown in

Table 7. Satisfactory defects which do not require repair shall be left as is; no

5. Inspect all surfaces of the head mass shroud for debonding. With a grease pencil, mark debonding which requires repairs or is deemed non-repairable as required. Do not mark debonding which doesn’t require repair. See Table 7 for a summary and definition of satisfactory, repairable, and non-repairable debonding. For non-repairable debonding, use the rejection instructions shown in See Table 7. Satisfactory debonding which does not require repair shall be left as is; no repairs will be performed on it.

6. Inspect the head mass shroud skirt/housing interface for debonding by using a dull hooked tool (such as a brass O-ring probe) along the circumference of the shroud rubber skirt/housing interface. Use the tool to gently press into the center of the rubber skirt. Do not force the tool to break the epoxy bead or the existing bond between the skirt and housing. Use gentle pressure. Do NOT insert the probe between the skirt and housing. With a grease pencil, mark debonding which requires repair or is deemed non-repairable as required. See

Table 7 for a summary and definition of repairable and non-repairable debonding at the shroud skirt/housing interface.

06 July 2020

Table 7 Inspection, repair, and rejection criteria for the transducer shroud and skirt defects which will not be repaired

Unsatisfactory defects which require repair

Unsatisfactory defects which cannot be repaired

Description of defect

Rejection instructions

Gouges or cuts shallower than 1 mm anywhere on the shroud/skirt

Debonding along the shroud skirt/housing interface that is less than 2” long and extends no further than 3/4" from the skirt/housing interface boundary

Debonding in the

5/8” band shown in

Figure 4 which cannot be successfully repaired

Reject to “H” condition; no further transducer inspection required Any evidence of debonding on any surface of the rubber shroud and skirt outside the shaded 5/8” band shown in Figure 4

Swollen bubbles or any evidence of water intrusion anywhere on head mass shroud and skirt

Reject to “H” condition; no further transducer inspection required

All shroud skirt debonding which doesn’t extend to the shroud skirt/housing interface within the

5/8” band shown in

Figure 4.

Metal corrosion deeper than 1/16”

Reject to “H” condition; no further transducer

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Figure 4 Shroud skirt 5/8” shaded bonding area

7. Inspect the transducer head mass ferrules for damage. With a grease pencil, mark defects that require repair or are deemed non-repairable as required. Do not mark defects that don’t require repair. See Table 8 for a summary and definition of satisfactory, repairable and non-repairable defects. For non-repairable defects use the rejection instructions shown in Table 8. Satisfactory defects that do not require repair shall be left as is; no repairs will be performed on them.

8. Verify proper ferrule alignment by inserting a mounting bracket (complete with epoxy washers/cheerios) into the ferrules. If the bracket fits, the alignment of the ferrules is considered satisfactory. Refer to Table 8 for rejection instructions if the ferrules are deemed misaligned.

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Table 8 Inspection, repair, and rejection criteria for the transducer head mass ferrules defects which will not be repaired

Unsatisfactory defects which require repair

Unsatisfactory defects which cannot be repaired

Description of defect

Rejection instructions

Slight debonding

(stretch or give in the rubber) between the shroud and ferrule around the edge of the ferrule.

To be satisfactory, ferrules must be securely attached in place and not

“slide” back and forth

Complex cuts (i.e.

cuts with a 90 degree bend), chunks of missing rubber, or cuts greater than ¼" long

Corroded or loose ferrules

Reject to “H” condition; no further transducer inspection required

Simple slices (no chunks of rubber missing) less than

¼" in length

Unit fails alignment test of paragraph

5.7.1 step 8

Reject to “H” condition; no further transducer

5.7.2 TRANSDUCER HOUSING VISUAL INSPECTION

transducer housing. The epoxy paint coating inspection applies to green epoxy coated transducers only and the rubber inspection applies to rubber-coated transducers only.

1. For epoxy paint coated transducers: Inspect the green epoxy coated housing for defects. With a grease pencil, mark defects that require repair or are deemed non-repairable as required. See Table 9 for a summary and definition of repairable and non-repairable defects. For non-repairable defects use the rejection instructions shown in See Table 9.

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Table 9 Inspection, repair, and rejection criteria for the epoxy coated housing

Unsatisfactory defects which require repair

Unsatisfactory defects which cannot be repaired

Description of defect

Rejection instructions

Any scratches or chips that expose bare metal to the environment

Metal corrosion deeper than 1/16”

Reject to “H” condition; no further transducer

2. For rubber coated transducers: Inspect the rubber-coated housing for defects.

With a grease pencil, mark defects that require repair or are deemed non-repairable as required. Do not mark defects that don’t require repair. See

Table 10 for a summary and definition of satisfactory, repairable and non-repairable defects. For non-repairable defects use the rejection instructions shown in Table 10. Satisfactory defects that do not require repair shall be left as is; no repairs will be performed on them.

Table 10 Inspection, repair, and rejection criteria for the rubber coated housing defects which will not be repaired

Unsatisfactory defects which require repair

Unsatisfactory defects which cannot be repaired

Description of defect

Rejection instructions

Gouges or cuts less than 1mm deep

Gouges or cuts in the housing rubber greater than 1mm deep

Metal corrosion deeper than 1/16”

Reject to “H” condition; no further transducer inspection required

Debonded areas that do not meet the criteria of “swollen bubble”

Swollen bubbles Reject to “H” condition; no further transducer inspection required

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5.7.3 TRANSDUCER END SEAL ASSEMBLY VISUAL INSPECTION

transducer end seal, which includes the rubber coating and connector, insert.

1. Inspect the end seal and end seal skirt for rubber defects. With a grease pencil, mark defects that require repair or are deemed non-repairable as required. Do not mark defects that don’t require repair. See Table 11 for a summary and definition of satisfactory, repairable, and non-repairable defects.

For non-repairable defects, use the rejection instructions shown in Table 11.

Satisfactory defects that do not require repair shall be left as is; no repairs will be performed on them.

2. Inspect all surfaces of the end seal for debonding. With a grease pencil, mark debonding which requires repairs or is deemed non-repairable as required. Do not mark debonding which doesn’t require repair. See Table 11 for a summary and definition of satisfactory, repairable, and non-repairable debonding. For non-repairable debonding, use the rejection instructions shown in Table 11. Satisfactory debonding which does not require repair shall be left as is; no repairs will be performed on it.

3. Inspect the end seal skirt/housing interface for debonding by using a dull hooked tool (such as a brass O-ring probe) along the circumference of the shroud rubber skirt/housing interface. Use the tool to gently press into the center of the rubber skirt. Do not force the tool to break the epoxy bead or the existing bond between the skirt and housing. Use gentle pressure. Do NOT insert the probe between the skirt and housing. With a grease pencil, mark debonding which requires repair or is deemed non-repairable as required. See

Table 11 for a summary and definition of repairable and non-repairable debonding at the end seal skirt/housing interface.

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Table 11 Inspection, repair, and rejection criteria for the transducer end seal and skirt defects which will not be repaired

Unsatisfactory defects which require repair

Unsatisfactory defects which cannot be repaired

Description of defect

Rejection instructions

Gouges or cuts shallower than 1 mm anywhere on the end seal/skirt

Debonding along the end seal skirt/housing interface that is less than 2” long and extends no further than 3/4" from the skirt/housing interface boundary

Debonding in the

5/8” band shown in

Figure 5 which cannot be successfully repaired

Mark as potential

“G” condition pending further visual inspections and electrical testing.

Any evidence of debonding on any surface of the rubber end seal and skirt outside the shaded 5/8” band shown in Figure 5.

Swollen bubbles or any evidence of water intrusion anywhere on end seal and skirt

Mark as potential

“G” condition pending further visual inspections and electrical testing.

All shroud skirt debonding which doesn’t extend to the shroud skirt/housing interface within the

5/8” band shown in

Figure 5.

Metal corrosion deeper than 1/16”

Mark as potential

“G” condition pending further visual inspections and electrical testing.

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Figure 5 End seal skirt 5/8” shaded bonding area

4. Inspect the end seal connector insert for damage. With a grease pencil, mark unacceptable damage as required. Do not mark defects that are acceptable.

See Table 12 for a summary and definition of satisfactory and unsatisfactory defects. For unsatisfactory defects use the rejection instructions shown in

Table 12. Satisfactory defects shall be left as is; no repairs will be performed on them.

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Table 12 Inspection & Rejection Criteria for the Transducer End Seal Connector Insert

Satisfactory defects which will not be repaired

Unsatisfactory defects which cannot be repaired

Description of defect Rejection instructions

Defects which do not qualify as a chip, crack or gross damage in static sealing surfaces shown in Figure 6 and do not impede the proper mating between the cable and receptacle (the brass connector ring can be fully torqued)

Bent, broken, corroded, or dislodged socket termini

Mark as potential “G” condition pending further visual inspections and electrical testing.

Any receptacle thread is entirely missing or cracks penetrate through the receptacle wall

Mark as potential “G” condition pending further visual inspections and electrical testing.

Chips, cracks or gross defects in the static sealing surfaces identified in

Figure 6.

Mark as potential “G” condition pending further visual inspections and electrical testing.

Defects which impede the proper mating of the cable

(the brass connector ring cannot be fully torqued)

Mark as potential “G” condition pending further visual inspections and electrical testing.

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Figure 6 Transducer End Seal Connector Insert Sealing Surfaces

5.7.4 TRANSDUCER RUBBER DRY ROT INSPECTION

The following procedure provides instructions and requirements for assessing transducer rubber for dry rot. This inspection applies to all rubber surfaces of the transducer including the face, shroud, housing (if applicable), and end seal. This inspection may be performed at the same time as the damage/debonding inspections already detailed for each transducer component.

When calculating the affected surface area of dry rot, each separate transducer component (e.g. face, shroud/skirt assembly, housing and end cap) shall be considered independently.

1. Inspect all transducer rubber surfaces for the presence of dry rot. Dry rot is defined as the cracking or splitting of the rubber due to a breakdown of the material. Transducer rubber, though, may exhibit superficial surface “spider webbing” which shall not be considered dry rot. To determine if transducer rubber is exhibiting dry rot or merely surface “spider webbing” use a dull

Socket

Static Sealing Surfaces

Light Gray: Flat Surface (vertical & horizontal at top of connector)

Medium Gray: Curved Surface around insert

Threads

Threads

06 July 2020 tipped tool (such as a flat O-ring tool) and apply slight pressure to the affected surfaces while visually observing its response with no magnification. The affected surface is dry rotted if the surface splits open due to the pressure. If the surface does not split open, the “spider webbing” is superficial and shall not be considered dry rot. See Figure 7 for a picture of acceptable superficial

“spider webbing”. Table 13 details the acceptable and unacceptable levels of dry rot on a transducer surface. Acceptable defects shall be left as is; no

Table 13 Inspection Criteria for Transducer Dry Rot

Satisfactory defects which will not be repaired

Unsatisfactory defects which cannot be repaired

Description of defect Rejection instructions

Any amount of superficial “spider webbing” as determined by paragraph

5.7.4.

Dry rot as determined by paragraph 5.7.4

(Step 1) which covers 50% or more

(estimated visually) on any one of each of the transducer components (face, shroud/skirt assembly, and housing) excluding end seal

Reject to “H” condition. No further transducer inspection required

Dry rot as determined by paragraph

5.7.4 which covers less than 50%

(estimated visually) of all of the transducer components (face, shroud/skirt assembly, housing and end cap)

Dry rot as determined by paragraph 5.7.4

Step 1) which covers

50% or more

(estimated visually) on the end seal only

Mark as potential “G” condition pending further visual inspections and electrical testing.

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Figure 7 Photograph of acceptable superficial rubber “spider webbing”

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6. TRANSDUCER ELECTRICAL BENCH TESTING.

Transducers that have passed visual inspection with no “H” condition defects shall be bench tested. The bench tests include DC resistance, capacitance/dissipation factor, and polarity testing. Any “G” condition candidate must pass all electrical bench checks per this section prior to being dispositioned as “G” condition.

6.1 DC RESISTANCE TEST

The DC Resistance requirements in the paragraph below are sourced by reference 3 that takes precedence. Any requirements in the below paragraph are only provided for general guidance purposes and exact requirements should be confirmed by consulting the reference.

Attach the test leads of a voltmeter (Simpson 260 or equivalent) across the leads of the transducer cable assembly. Reverse the leads and repeat the measurements. Table 14 contains the DC resistance requirements.

Table 14 DC Bench Testing Requirements

Testing direction Resistance Requirement

Black lead to White lead 3.0 to 15.0 ohm

White lead to Black lead 3.0 to 15.0 ohm

6.2 CAPACITANCE AND DISSIPATION FACTOR TEST

Measure the capacitance and dissipation factor using an RLC bridge at 1 kHz and 100 mVolt or less (B&K Precision 885, ESI 252, or equivalent). Table 15 contains the capacitance and dissipation factor requirements.

Capacitance and Dissipation Factor Testing Requirements in the paragraph below are sourced by reference 3 that takes precedence. Any requirements in the below paragraph are only provided for general guidance purposes and exact requirements should be confirmed by consulting the reference.

Table 15 Capacitance and Dissipation Factor Testing Requirements

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Test Requirement

Capacitance

(Black lead to White lead)

18.4 ± 2.8 nF

Dissipation Factor

(Black lead to White lead) < 0.05

6.3 POLARITY TEST

Conduct a polarity test using a null meter (Keithley 155 or equivalent). Connect the (+) lead to the White lead and (-) lead to the Black lead. Apply a modest force to the transducer face to the extent required to observe a deflection on the null meter. Table 16 contains the polarity testing requirements.

Polarity Testing Requirements in the paragraph below are sourced by reference 1 that takes precedence. Any requirements in the below paragraph are only provided for general guidance purposes and exact requirements should be

Table 16 Polarity Testing Requirements

Test Requirement

Polarity

(White lead positive to

Black lead negative)

Initial instantaneous deflection is in negative direction

6.4 TEST RESULTS

1. If the transducer passes electrical bench tests and is not a “G” condition candidate, enter satisfactory test data onto the applicable TR-317 RESTORATION

SCREENING SHEET (Appendix A). Forward the transducer for completion of repairs and/or final visual inspection in accordance with paragraph 7.

2. If any of the electrical bench tests fail or testing was not possible due to the extent of transducer damage (regardless of whether the transducer was a “G” candidate or not), reject the transducer into “H” condition. No further inspections, tests, or repairs will be performed. When dispositioning a transducer as “E” condition, document all electrical test readings for on-site engineering to evaluate.

3. If the transducer was a “G” condition candidate and passed all of the electrical bench tests, then disposition the transducer as “G” condition.

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7. TRANSDUCER REPAIRS AND PRE-HYDRO VISUAL INSPECTION

1. If required, repair transducer defects found in paragraph 5.7 using the

Reparability instructions of Section 4 to the extent required to restore all defects to an acceptable condition. Document completion of any required repairs on the applicable TR-317 RESTORATION SCREENING SHEET (Appendix A).

2. Upon completion of all repairs, if the transducer does not already have them, apply a bead of Fusor 305 (pc 11 Table 5) to the head shroud skirt/body interface and to the end seal skirt/body interface over the entire circumference of the transducer. Do not over apply the adhesive. Use masking tape as required to prevent over application. This bead is being applied to prevent possible separation at the head shroud skirt/body interface and the end seal skirt/body interface.

3. Perform a final visual inspection on all transducers in accordance with section 5.7 to certify they are ready for final acceptance testing. Document the satisfactory pre-hydro visual inspection on the applicable TR-317 RESTORATION

SCREENING SHEET (Appendix A) and forward the transducer for final acceptance testing in accordance with Section 8.

8. TRANSDUCER FINAL ACCEPTANCE TESTING.

Transducer acceptance testing consists of hydrostatic and acoustic testing. The transducer acceptance testing shall be performed in accordance with references 1 and 3. The final acoustic test results shall be accepted by the acoustic test requirements called out in references 1 and 3. Only transducers that have had all required repairs completed and passed all visual inspections and electrical bench testing shall be submitted for final acceptance testing. Testing requirements are called out in the following test paragraphs.

8.1 HYDROSTATIC PRESSURE TEST

The following procedure details how to perform the hydrostatic pressure testing of TR-317B/C/D transducers. Subject the transducer to the hydrostatic pressure sequence outlined in Table 17.

This testing shall always be conducted prior to final acoustic testing. A test cable shall be used to provide a watertight connection to the transducer under test to facilitate performing insulation resistance and DC resistance measurements while the transducer is under test.

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Hydrostatic Pressure Test Requirements in the paragraph below are sourced by reference 1 that takes precedence. Any requirements in the below paragraph are

Table 17 Hydrostatic Pressure Test Sequence

Cycles to Pmax Duration of Peak Pressure

Cycle 1 30 ± 5 minutes

Cycles 2, 3, and 4 5 to 10 seconds

Cycle 5 30 ± 5 minutes

1. Place the transducer inside of the pressure vessel.

2. Connect a test cable to the transducer under test. Torque the cable coupling nut to

150 10 inch-lbs. using the TR-317B special spanner wrench.

3. Fill the pressure vessel with water and conduct the pressurization sequence as outlined in Table 17.

4. Measure the Insulation Resistance (with 500 volts ± 10 percent applied) between each lead to pressure tank ground and DC resistance across the leads under the following conditions:

Insulation Resistance Measurements

a. At 0 psig in water at start of test.

b. At Pmax ± 50 psig in water at the end of each 30-minute cycle.

c. At 0 psig in water after the pressure cycle test.

5. The Insulation Resistance for the in-water measurement of any applicable combination of lead and ground shall be greater than 100 megohms.

6. Drain the pressure vessel, disconnect the test cable from the transducer under test and remove the transducer from the pressure vessel.

7. If the transducer fails any testing, inspect for potential test cable failure/water intrusion and retest the transducer with a different test cable prior to determining the transducer as failed.

8. If the transducer fails testing even after attempting to retest, reject the transducer into “H” condition. When dispositioning a transducer as “H” condition, document all electrical test readings for on-site engineering to evaluate.

9. If the transducer passes the hydrostatic testing requirements of Table 17 and Step

4, forward the transducer for acoustic…