LD10 Pintle SOW Full - Nov 8.pdf

SCOPE OF WORK

PINTLE AND BUSHING FABRICATION

PART 1 GENERAL

1.1 SCOPE

Fabrication of four (4) pintles balls, four (4) pintle bushings, and supply various specified items required for installation of these pieces. The pintles must have an outer bearing surface finished truly hemispherical and the pintle bushings must have an inner bearing surface finished truly hemispherical. Machine work to be performed under this contract is shown on the attached drawings and is described by this specification.

Summary of Work

a. Fabricate and supply pintles and pintle bushings as specified in drawings

b. Machine hemispherical surfaces on pintle bushings as specified

c. Mill grooves into pintle bushings for lubricant routing and for O-ring seals

d. Supply specified O-ring seals, lifting eyebolts, keys, and fasteners

The height of the pintle ball and pintle bushing determines the miter gate elevation. Once installed, there is no method to adjust the gate elevation.

For this reason, care must be taken to minimize the change in assembled height, and the machined pintle and pintle bushing height must conform to the attached drawing dimensions.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. (AIA/NAS)

AIA/NAS NAS410 (2020; Rev 5) NAS Certification &

Qualification of Nondestructive Test

Personnel

AMERICAN SOCIETY FOR NONDESTRUCTIVE TESTING (ASNT)

ANSI/ASNT CP-189 (2020) ASNT Standard for Qualification and

Certification of Nondestructive Testing

Personnel (ANSI/ASNT CP-105-2006)

ASNT SNT-TC-1A (2020) Recommended Practice for Personnel

Qualification and Certification in

Nondestructive Testing

ANSI/MSS SP-55 (2011) Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other

Piping Components - Visual Method for

Evaluation of Surface Irregularities

ASME INTERNATIONAL (ASME)

ASME B1.1 (2019) Unified Inch Screw Threads (UN and UNR

Thread Form)

ASME B1.20.1 (2018) Pipe Threads, General Purpose (Inch)

ASME B18.15 (2021) Forged Eyebolts

ASME B46.1 (2019) Surface Texture, Surface

Roughness, Waviness and Lay

ASTM INTERNATIONAL (ASTM)

ASTM A388/A388M (2019) Standard Practice for Ultrasonic

Examination of Steel Forgings

ASTM A489 (2018) Standard Specification for Carbon

Steel Eyebolts

ASTM A564/A564M (2019) Standard Specification for Hot-

Rolled and Cold-Finished Age-Hardening

Stainless-Steel Bars and Shapes

ASTM B148 (2018) Standard Specification for Aluminum-Bronze Sand

Castings

ASTM B271/B271M (2023) Standard Specification for Copper-Base Alloy

Centrifugal Castings

ASTM E94/E94M (2022) Standard Guide for Radiographic

Examination Using Industrial Radiographic

Film

ASTM E165 (2018) Standard Practice for Liquid

Penetrant Testing

ASTM E186 (2020) Standard Reference Radiographs for Heavy-Walled (2 to 41⁄2 in. (50.8 to 114 mm)) Steel Castings

ASTM E272 (2021) Standard Reference Radiographs for High-Strength Copper-Base and

Nickel-Copper Alloy Castings

ASTM E280 (2021) Standard Reference Radiographs for Heavy-Walled (41⁄2 to 12 in. (114 to 305 mm)) Steel Castings

ASTM E390 (2020) Standard Reference Radiographs for Steel Fusion Welds

ASTM E446 (2020) Standard Reference Radiographs for Steel Castings Up to 2 in. (50.8

mm) in Thickness

ASTM E1030/E1030M (2021) Standard Practice for

Radiographic Examination of

Metallic Castings

ASTM E1032 (2019) Standard Practice for

Radiographic Examination of

Weldments Using industrial x-Ray

Film

ASTM E1417/E1417M (2021) Standard Practice for Liquid

Penetrant Testing

ASTM E1742/E1742M (2018) Standard Practice for

Radiographic Examination

ASTM E1955 (2020) Standard Radiographic Examination for Soundness of Welds in Steel by

Comparison to Graded ASTM E

390 Reference Radiographs

ASTM F468 (2022) Standard Specification for

Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for

General Use

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 10360-2 (2009) Geometrical Product Specifications

(GPS) — Acceptance and Reverification

Tests for Coordinate Measuring Machines

(CMM) — Part 2: CMMs Used for Measuring

Linear Dimensions

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 1110-2-2610 (2013) Mechanical and Electrical

Design for Lock and Dam Operating

Equipment

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following:

SD-02 Shop Drawings

Pintle Balls; G, ME

Pintle Bushings; G, ME

Fabricated Miscellaneous Materials; G, ME

Purchased Miscellaneous Materials; G, ME

SD-06 Test Reports & Procedures

Radiographic Testing Procedure; G, ME

Ultrasonic Testing Procedure; G, ME

Welding Procedure; G, ME

Radiographic Test Report; G, ME

Ultrasonic Test Report; G, ME

Liquid Penetrant Test Report; G, ME

SD-07 Certificates

Certified CP-189 Level II in Radiographic Testing (RT); G, ME

Certified CP-189 Level II in Penetrant Testing (PT); G, ME

Certified CP-189 Level II in Ultrasonic Testing (UT); G, ME

American Welding Society Certified Welding Inspector (AWS CWI);

G, ME

Submittals will be approved by either the point of contact (POC) or technical point of contact (TPOC).

POC: Theodore Hecht

Theodore.r.hecht@usace.army.mil

651-290-5415

POC: Mike Holzer

Michael.A.Holzer@usace.army.mil

651-290-5989

1.3.1 Radius Certification

Submit certification that the final machined hemispherical radii for each of the pintles and pintle bushings are within specified tolerances to the TPOC.

The certification must be signed by the machinist and a designated 3rd party

Quality Assurance (QA) representative.

1.3.2 Procedures

Testing procedures are subject to approval by the government before proceeding with their use. Submit the testing procedure for the chosen method, radiographic or ultrasonic, along with testing personnel qualifications and certifications.

If welding is required, welding procedures are subject to approval by the government before proceeding with their use. The Contractor must submit the proposed welding procedures and proof of welder qualification for the proposed welding procedures to the Contracting Officer. The welding procedures must include the following as a minimum: weld callouts; preheat treatment; interpass temperature; filler rod; welder machine and process used; polarity; and post heat treatment. Fusion welding should not be used unless it is deemed necessary and must be authorized by USACE. If fusion welding is authorized by USACE, it must be inspected using ASTM E390 Standard

Reference Radiographs for Steel Fusion Welds.

mailto:Theodore.r.hecht@usace.army.mil mailto:Michael.A.Holzer@usace.army.mil

1.3.3 O-ring Seal Description

Submit catalog cuts for the O-rings to include method of splicing (bonding), material specifications, and dimensions.

1.3.4 Shop Drawings

Detailed shop drawings for pintles balls, pintle bushings, and all shop fabricated metal items, must be submitted and approved prior to fabrication. The provided drawings may be submitted and suffice as approved shop drawings should there be no changes to the design during the fabrication process.

1.3.5 Material Orders

For materials that are not in stock, substitute equal materials may be requested. Any substitute material must be approved by the government. Submit copies of purchase orders, mill orders, shop orders and work orders for substitute materials prior to the use of the materials in the work.

1.4 SHIPPING, DELIVERY, STORAGE, AND HANDLING

The Pintle Balls are required to be inspected by the Government prior to being crated and prior to shipping and/or delivery. The stainless steel pintle components must be coated with an appropriate temporary rust preventative compound after inspection but prior to acceptance by the

Government and prior to shipment.

The pintle balls and pintle bushings are required to be crated prior to shipping and/or delivery. The crating containers must be constructed in a manner that allows for movement with a forklift and marked on four (4) sides with the contract award number, description of contents, number of pieces, and weight. Pintle balls must be packaged in sets of components. Prior to shipping, the Contractor must submit a packing list for the contents of each crate to the Contracting Officer and the Operations point of Contact, Mike

Holzer, at least 15 days prior to shipment, via email. The Contractor is responsible for notifying the Contracting Officer forty-five (45) days prior to shipping the finished pieces. The Contractor must notify the POC seven (7) days in advance of delivery the finished pieces. The Contractor is responsible to repair any damage that may occur during shipping.

The contractor will deliver the finished pintles and pintle bushings (and the miscellaneous contractor-furnished parts) by June 1, 2024 to:

US Army Corps of Engineers

Fountain City Service Bay

Attn: Mike Holzer

431 North Shore Drive

Fountain City, WI 54629

1.5 QUALITY ASSURANCE

The Contractor will be responsible to maintain records to certify compliance with all aspects of this contract and must make these records available in a timely manner should the POC request to see them.

1.6 ACCEPTANCE

Make the completed pieces available for final inspection by the Government at the Contractor's facility prior to any application of protective coatings and prior to shipment. Notify the POC at least seven (7) days in advance of when the pieces will be available for inspection.

The final products must be free from imperfections that may impair serviceability. Any products which show tolerance errors, distortion, fissures, notches, cracks, cross threads, or variance from the specified condition may be cause for rejection and must be corrected at the

Contractor's expense.

PART 2 PRODUCTS

2.1 MATERIALS

Submit system of identification which shows the disposition of specific lots of approved materials and fabricated items in the work, before completion of the contract.

2.1.1.1 Metals

Stainless steel, bronze, aluminum bronze, and other metal materials used for fabrication must conform to the requirements shown in the following paragraphs.

2.1.1.2 Aluminum Bronze Pintle Bushing

Fabricate pintle bushing(s) from an aluminum bronze alloy material which conforms to the requirements of ASTM B148, C95400 or ASTM B271 C95400. Heat treat in accordance with TABLE 3 in ASTM B148. Machine pintle bushing(s) to meet the dimensions, surface finish and tolerances as indicated in the contract drawings. Pattern cast and machine the bushing or machine the bushing from a solid piece of material to acquire the shape and surface finishes indicated. Provide a surface finish of 16 micro-inches or better on the running bearing surface. Surface finishes are shown on the drawings in accordance with ASME B46.1.

Permanently label each pintle and bushing on a non-mating surface by engraving, stamping or laser etching a serial number. The serial numbers must be at least 12 font and follow the convention XXXXXXX-PN-001, where the first seven numbers (XXXXXXX) are the contract number, PN designates pintle, and the last three numbers are the individual identifier

(example: 1111111-PN-001, 1111111-PN-002..., 1111111-PN-008).

Mate the bushing bearing surface with the corresponding pintle ball through metrology methods and the use of a calibrated scanning probe coordinate measuring machine that meets the requirements of ISO 10360-2, compare with contact measurements or dye or tape to confirm uniform bearing contact. The contact area between the mating components must be tested to achieve a bearing contact area of 85 percent or better to be acceptable. This test must be witnessed by the Government, and the Contractor will notify the Government seven (7) days prior to testing. In the event the Government declines to attend, the testing results will be sent to the Contracting Officer promptly for Government review. All serial number pairings of mated pintle balls and pintle bushings must be recorded and reported to the government as a submittal.

All threads machined into the pintle bushing must be in accordance with ASME

B1.1 or ASME B1.20.1, as appropriate.

2.1.1.3 Stainless Steel Pintle Ball

Fabricate pintle ball(s) from hot-rolled stainless steel which conforms to the requirements of ASTM A564/A564M TYPE 630 H1150, UNS S17400. Machine pintle ball(s) to meet the dimensions, surface finishes, and tolerances as indicated in the attached drawings. Any forging dies or patterns developed become property of the Government and must be packaged for long term storage with the pertinent part identification provided on the exterior packaging.

The pintle ball will free float into the pintle bushing without distortion or altering the fit with the mating pintle bushing. Furnish removable lifting eyebolts with the pintle ball for lifting.

Mate the pintle ball bearing surface with the pintle bushing through metrology methods and the use of a calibrated scanning probe coordinate measuring machine that meets the requirements of ISO 10360-2, compared with contact measurements or dye or tape to confirm uniform bearing contact. Test the contact area between the mating components to achieve a bearing contact area of 85 percent or better to be acceptable. This test must be witnessed by the

Government, and the Contractor will notify the Government seven (7) days prior to testing. All serial number pairings of mated pintle balls and pintle bushings must be recorded and reported to the government as a submittal. The maximum static bearing pressure for the pintle ball must not exceed 9000 psi when a normal load 625,510 pounds is applied at an angle of 36.22 degrees from horizontal or 18000 psi during dynamic operation.

All threads machined into the pintle ball must be in accordance with ASME

B1.1 or ASME B1.20.1, as appropriate.

2.1.2 O-ring Seals

Supply and install elastomeric NBR acrylonitrile butadiene (Buna-Nitrile or

"Buna N") O-rings with the pintle assemblies. The O-rings must be 70 Shore

Durometer Hardness, 0.50-inch circular cross-sectional diameter, with pitch diameter to fit to the pintle bushing O-ring grooves as shown on the Contract

Drawing. The O-rings will have diameter of the seal of 15.75 inches. The O-ring loop may be spliced by bonding, provided the spliced cross section develops full tensile properties of the base material. The method of splicing must be submitted for approval. The Contractor will supply six (6) bonded O-rings (includes 2 spares).

2.1.3 Miscellaneous Materials

Supply the following items. Fabricate to the dimensions and tolerances shown on the contract drawings. Variances from the below listed requirements are allowed only if specifically approved by the Contracting Officer.

All eyebolts and set screws must be in accordance with ASME B1.1, ASME

B18.15, or ASTM A489 as appropriate.

2.1.3.1 Pintle Bushing Lifting Eyebolt

Galvanized or zinc-plated steel, ASTM A489, 3/4”-10 UNC threads, minimum safe working load 5000 lbs. These are optional and can be used for lifting pintle bushings during machining. Certify the eyebolts fit the pintle bushing threads. Detail included on drawings.

2.1.3.2 Pintle Eyebolt

Galvanized or zinc-plated steel, ASTM A489, 3/4”-10 UNC threads, minimum safe working load 5000 lbs. These will be used for lifting pintle balls in the field.

Certify the eyebolts fit the pintle threads. Contractor will supply two (2) eyebolts. Detail included on drawings.

2.1.3.3 Set Screw - Type 1: 3/4”-10 UNC x 2.50

Purchase or fabricate from bronze, ASTM F468, Alloy 655 (Silicon Bronze).

Contractor will supply eighteen (18) type 1 set screws (includes two spares). A detail for this item is included on drawings.

2.1.3.4 Set Screw - Type 2: 3/4”-10 UNC x 3.625

Contractor will supply five (5) type 2 set screws (includes one spare). A detail for this item is included on drawings.

2.1.3.5 Key Screw: 5/8”-11 UNC x 1.50 Hex Head

Contractor will supply ten (10) key screws (includes two spares). A detail for this item is included on drawings.

2.1.3.6 Key

Fabricate from 316 stainless steel. Contractor will supply ten (10) keys

(includes two spares) to the dimensions shown on the drawings.

PART 3 EXECUTION

3.1 PINTLE BUSHING MACHINING

Machine the hemisphere surface to obtain the surface finish and tolerance required. Location of hemisphere center point must be recorded and reported to the Contracting Officer as a submittal.

Machine the grease channels to the dimensions, tolerances, and surface finishes as indicated on the contract drawings. Deburr and relieve all sharp edges on milled grooves.

Mill two annular grooves into each pintle bushing hemisphere. The upper annular groove is the grease return channel. The lower annular groove is the

O-ring seal recess. Details and dimensions are shown on the drawings.

Machine the grease groove and O-ring groove last, after resurfacing the hemispheres. Deburr and relieve all sharp edges on milled grooves.

Drill and tap the bore on top of each pintle bushing to accept a 1/2"-14 NPT grease pipe. This bore will not be used for lifting. Drill and tap two (2)

1/2”-13 UNC handling holes into the bottom of the bushing per drawings. These will be used for installing the pintle bushing. Drill and tap five (5) 5/8”-11

UNC holes for set screws per drawings.

"The aluminum bronze bushing is to be press fit into the pintle socket and secured by bolting to the socket. The amount of press fit of the bushing in the socket should be kept minimal" in accordance with USACE EM 1110-2-2610.

This is to "prevent any alteration of the machined fit between the bushing and pintle ball after assembly." The outer pintle bushing diameter must be 1'-6"

+0.001/-0.000 after machining. The pintle socket inner diameter will be kept to 1'-6" +0.001/-0.000. This must result in a modified FN1 fit. Confirmation of dimensions for the pintle socket may be obtained by contacting the POC.

3.2 PINTLE MACHINING

Machine the hemisphere surface to obtain the surface finish and tolerance indicated on the contract drawings. Location of hemisphere center point must be recorded and reported to the Contracting Officer as a submittal.

Drill and tap the top of each pintle to accept the threaded eye bolt as indicated on the contract drawings. Machine (as required) the key slot on the lower lip of each pintle to match the dimensions given on the attached drawings.

3.3 PINTLE COMPONENT NONDESTRUCTIVE TESTING EXAMINATION

3.3.1 Castings and Forgings

Each casting and forging must bear cast or stamped mark numbers. Castings and forgings weighing more than 500 pounds must also bear cast or stamped heat numbers. Dimensions shown on approved detail drawings will be finished dimensions. Castings or forgings that are warped or otherwise distorted or that are oversized to an extent that will interfere with proper fit with other parts of other structures will be rejected. The structure of metal in castings or forgings must be homogeneous and free from excessive nonmetallic inclusions. Excessive segregation of impurities or alloys at critical points in castings or forgings will be cause for rejection. Repairs to castings or forgings will not be made without prior approval. Minor surface imperfections not affecting the strength of the casting or forging may be welded in the "Green" only if specifically authorized by the Government. Surface imperfections will be considered minor when the depth of the cavity prepared for welding is the lesser of 20 percent of the actual wall thickness or 1 inch. Defects other than minor surface imperfections may be welded only when specifically authorized by the Government and meet the following requirements:

(1) The defects have been entirely removed and are judged not to affect the strength, use, or machineability of the casting or forging when properly welded and stress relieved.

(2) The proposed welding procedure, stress relief, and method of examination of the repair work have been submitted and approved by the

Contracting Officer.

3.3.2 Welding of Steel Castings and Forgings

Unsound material must be removed from the surfaces of steel castings or forgings to be incorporated into welded connections by chipping, machining, air-arc gouging or grinding. Major connections designed for the transfer of stresses must not be welded if the temperature of the casting or forging is lower than 100 degrees Fahrenheit. Castings or forgings containing over 0.35 percent carbon or over 0.75 percent manganese must be preheated to a temperature not to exceed 450 degrees Fahrenheit, and welding must be accomplished while the castings or forgings are maintained at a temperature above 350 degrees Fahrenheit. Welding will not be permitted on castings or forgings containing carbon in excess of 0.45 percent, except when authorized in writing. Castings or forgings requiring welded repairs after the first annealing and involving welding fabrication must be stress-relieved annealed prior to receiving final machining unless otherwise permitted. The proposed welding procedure, stress relief, and method of examination of the repair work must be submitted and approved by the Contracting Officer before any welding is performed.

3.3.3 Tests, Inspections, and Verifications

The Contractor must have all required material tests and analysis performed and certified by an approved laboratory to demonstrate that the chemical requirements and the mechanical requirements for the materials for the pintle bearing assembly components are in conformance with the specifications. These tests and analytics must be performed after castings and forgings are completed and before machining of the items has started. Test reports must be submitted to the Contracting Officer immediately after completion of the testing. Tests must be conducted in the presence of the Contracting Officer if requested by the Government. The Contractor must furnish specimens and samples for additional independent tests and analyses upon request of the

Contracting Officer. Specimens and samples must be properly labeled and prepared for shipment.

3.3.4 Nondestructive Testing

All parts associated with the pintle assembly will be inspected and tested as outlined in paragraph 3.3.5, and all costs associated with these will be included in the original contract cost.

When doubt exists as to the soundness of any material part, such part may be subjected to any additional form of nondestructive testing as determined by the Contracting Officer. This may include ultrasonic, liquid penetrant, x-ray, gamma ray, or any other test that will thoroughly examine the part in question. The cost of such investigation will be borne by the Government.

Any cracks or defects found may be cause for immediate rejection and rejected parts shall be replaced and retested at the Contractor's expense.

3.3.5 Inspection of Castings and Forgings

Radiographic or Ultrasonic inspections must be performed on all castings and forgings and must be performed by a Certified CP-189 Level II person. Submit copies of certificates showing evidence of qualifications or certifications. Provide reports for all nondestructive testing. All nondestructive testing film shall be submitted to the QA inspector prior to final acceptance.

Perform visual and radiographic or ultrasonic inspections of the bushings and pintle balls. Visual inspection and acceptance criteria in accordance with

ANSI/MSS SP-55. Procedures for making, evaluating, and reporting ultrasonic inspections must be in accordance with ASTM A388. Procedures for making, evaluating, and reporting radiographic inspections must conform to the requirements of ASTM E94/E94M and ASTM E1030/E1030M. All radiographic or ultrasonic inspection work must be completed by an ANSI/ASNT CP-189–qualified person.

The radiographic shooting diagram for pintle bushings and pintle balls must be in accordance with ASTM E94/E94M. The castings and forgings are unacceptable if shown to have defects greater than the following severity levels:

Pintle Bushing; ASTM E272 (Cu and Ni based alloy castings)

Radiographic Indication Acceptance Criteria

Description Code Severity Level

Gas Porosity A 3

Sand Inclusions Ba 3

Dross Inclusions Bb 2

Shrinkage, Linear Ca 3

Shrinkage, Feathery Cd 3

Shrinkage, Spongy Cd 3

Cracks None Allowed

Hot Tears None Allowed

Chaplets None Allowed

Pintle Ball; ASTM E446 (thickness up to 2 inches)

Category Description Severity Level

A Gas Porosity 3

B Sand and Slag Inclusions 2

C Shrinkage

CA 2

CB 1

CC 2

CD 1

D Cracks None Allowed

E Hot Tears None Allowed

F Inserts None Allowed

Pintle Ball; ASTM E186 (thickness 2 to 4 ½ inches)

Category Description Severity Level

A Gas Porosity 4

B Sand and Slag Inclusions 3

C Shrinkage

Type 1 3

Type 2 3

Type 3 3

D Cracks None Allowed

F Inserts None Allowed, unfused

Pintle Ball; ASTM E280 (thickness 4 ½ to 12 inches)

Category Description Severity Level

A Gas Porosity 4

B Sand and Slag Inclusions 4

C Shrinkage

Type 1 3

Type 2 3

Type 3 3

D Cracks None Allowed

F Inserts None Allowed

3.3.5.1 Pintle Balls, Pintle Bushings, and Components

All Pintle bushings, balls and fabricated pintle components must have the following NDT testing performed.

• Pintle ball: radiographic testing per ASTM E94/E94M, ASTM E1742/E1742M, ASTM E1030/E1030M, and ASTM E1032 or ultrasonic testing per ASTM A388

• Pintle bushing: radiographic testing per ASTM E94/E94M, ASTM

E1742/E1742M, ASTM E1030/E1030M, and ASTM E1032 or ultrasonic testing per ASTM A388

• Set screws, key screw, and key: liquid penetrant testing per ASTM

E1417/E1417M, Type 1 - Fluorescent dye, Sensitivity Level 3 – High, no cracks allowed

Only ANSI/ASNT CP-189 qualified personnel may perform radiographic NDT testing. Radiographic acceptance criteria for castings and forgings satisfies the minimum severity level requirements for a Grade I condition as defined by ASTM E1955.

Only ANSI/ASNT CP-189-rated personnel may perform ultrasonic testing.

Any cracks found are unacceptable and reason for immediate rejection.

Evaluate all relevant indications greater than 1/16 inch in length present on radiographic films against the specified acceptance criteria where the length of each indication (li) within an area of interest and along a continuous straight line oriented in the direction of interest are measured. If the distance between two indications is smaller in length than the length of the smaller indication, then both indications must be added and treated as a single indication to include the distance of both indications as well as the distance between the indications. The total indication length is obtained as the sum of all indication lengths on a straight line within the area of interest. The maximum total indication length (lim) on any such single straight line is used to assess acceptance of the casting being evaluated.

This maximum total indication length (lim) is divided by the feature length

(Lf), where (Lf) equals 1-1/8 inches, to calculate the indication fraction F

(F = lim / Lf). The value of indication fraction F must be acceptable for values less than a Level I F=0.1. Provide 7-day advance notice of the NDT testing and perform all testing in the presence of the POC. If testing and certification is not performed in the presence of the POC, the Government reserves the right to perform independent quality verification, at the expense of the Contractor, and the acceptable total indication length (lim) for the acceptable indication fraction Level will be increased by 1/16 inch for the calculation to account for reproducibility in the evaluation. The manufacturer must certify in writing that the inspection was performed in accordance with the requirements specified and found to meet or exceed the requirements of the specified inspection level.

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