3524_243_A.pdf

TP: 3524

(HM&E MANUAL)

TECHNICAL MANUALS

SEAL, FORWARD STERN SHAFT -

MODEL MB SERIES REV. 1

JOHN CRANE INTERNATIONAL

DISTRIBUTION STATEMENT D. - Distribution authorized to Department of Homeland Security, DoD and their contractors to protect publications required for official use or for administrative or operational purposes only, determined on 7 January 1997. Other requests for this document shall be referred to Commander, USCG Surface Forces Logistics Center, ESD - Tech Info Mgmt Br, 2401 Hawkins Point Road (M/S 25), Baltimore, MD 21226

WARNING – This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 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.

DESTRUCTION NOTICE. - For unclassified, limited documents, destroy by any method that will prevent disclosure of contents or reconstruction of the document.

PUBLISHED UNDER AUTHORITY OF THE U.S. COAST GUARD

SWBS 243

SECTION: A

Department of Homeland Security

UNITED STATES

COAST GUARD

Individual Manual Application Sheet

Technical Publications Number

Section Applicability

SWBS Number 243 SWBS Element Title PROPULSION SHAFTING

Section Identifier A

Equipment Functional Description

SEAL, FORWARD STERN SHAFT -

MODEL MB SERIES REV. 1

CI Functional Description ESWBS Code Remarks

Planset Hulls

225-WLB 201, 202, 203, 204, 205

225B-WLB 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216

WLB 225' Seagoing Buoy Tender

Seal, Forward Stern Shaft

Manufacturer: John Crane

Model N0. MB Series Rev. 1

SWBS/TAB: 243 - ATPN: 3524

201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 Hull Applicability 243-01-04

DTCG23-98-C-AWL501

DTCG23-93-C-AWL401

Built By:

Marinette Marine Corporation

LIST OF EFFECTIVE PAGES

(Insert latest changed pages. Destroy superseded pages.)

NOTE: The portion of the text affected by the changes are indicated by a vertical line in the outer margin of the page. Changes to illustrations are indicated by miniature pointing hands. Changes to wiring diagrams are indicated by shaded areas.

Dates of issue for original and changed pages are:

ORIGINAL . . . . . . . . . . . . . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . . . . 01 JUNE 1995 CHANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . . . . . . . 01 MARCH 2001 CHANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . . . 12 MARCH 2004

PAGE NO. TITLE *CHANGE PAGE NO. TITLE *CHANGE

NO. NO.

Title Page List of Effective Pages Change Record Validation Certificate/blank Table of Contents Page 1 thru 23 APPENDIX Page 29

(*) Zero in this column indicates an original page.

Change 2

CHANGE RECORD

CHANGE

NO. DATE TITLE AND OR

BRIEF DESCRIPTION SIGNATURE

3/1/01

3/12/04

Define Torque Wrench and Clock Gage Specifications listed under special tools and test equipment.

This change created to update revision levels on System Drawing and Parts List

Change Record

Except as stated in II, the technical manual identified above has been satisfactorily validated in accordance with all requirements of the applicable TMCR and the approved Validation Plan. This technical manual is hereby certified to be accurate and complete, and the information, instructions, text and illustrations conform in all respects to the applicable general and detailed specifications.

Seal, Forward Stern Shaft John Crane MB Series Rev. 1

243 - A

WLB 225' JUNIPER Class Seagoing Buoy Tender

TECHNICAL MANUAL VALIDATION CERTIFICATE

DTCG23-98-C-AWL501

DTCG23-93-C-AWL401

201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 21HULL APPLICABILITY:

243-01-04

TECHNICAL MANUAL TITLE:

COAST GUARD TECHNICAL PUBLICATION NUMBER

CONTRACT NUMBER/TMCR NO.

I -VALIDATION TYPE: 3-Desktop review/analysis And 1-Physical performance

(FINAL)

Date: 3/30/2004

II - EXCEPTIONS:

EXCEPTIONS AUTHORIZED BY

Manufacturer:

Model N0:

SWBS-TAB:

Change:

SIGNATURE OF PUBLICATION QUALITY ASSURANCE OFFICER DATE

30 Mar 0430 Mar 04

TABLE OF CONTENTS

TITLE PAGE

1. INTRODUCTION ------------------------------------------------------------------------------ 1

2. PREPARATION -------------------------------------------------------------------------------- 2

1. Prior to Installation ------------------------------------------------------------------------- 2

2. Seat Machining------------------------------------------------------------------------------ 2

3. SAFETY SUMMARY ------------------------------------------------------------------------- 3

4. INSTALLATION – SHAFT “IN” SITUATION-------------------------------------------- 6

1. Mane Seal------------------------------------------------------------------------------------ 6

2. Inflatable Seal ------------------------------------------------------------------------------15

3. Outboard Seal ------------------------------------------------------------------------------16

4a. TAILSHAFT REMOVED SITUATION ---------------------------------------------------17

1. Partially/Fully Split Seal ------------------------------------------------------------------17

2. Outboard Seal ------------------------------------------------------------------------------17

3. Inboard Seal --------------------------------------------------------------------------------17

5. INFLATABLE SEAL -------------------------------------------------------------------------18

6. TESTING ---------------------------------------------------------------------------------------20

7. MAINTENANCE ------------------------------------------------------------------------------21

8. REPAIR PARTS -------------------------------------------------------------------------------24

9. GENERAL ARRANGEMENT DRAWING -----------------------------------------------26

APPENDIX I ---------------------------------------------------------------------------------------29

1. INTRODUCTION:

"M" series seals are produced for a wide variety of applications, however these instructions are applicable to all makes of seals regardless of size or lubricant used.

For descriptions of the various types of "M" series seals available see APPENDIX I.

These instructions should read in conjunction with the general arrangement drawings and apply to the fitting of aii"M" series seals.

The primary seal is provided by continuous rubbing contact between the rotating seat and the face of the stationary seal unit. This contact is sustained by spring pressure applied through a flexible spring assembly. The seal unit is thus able to accommodate low frequency shaft movement, high frequency movement at shaft speed and induced vibrations of very high frequencies.

The main seal requires no adjustment between refits and inboard seal components, subject to wear and failure, are visible without dismantling. All work on the outboard seal must be carried out in drydock or with the vessel tipped.

The inflatable seal (if fitted) is housed in the mounting ring of the inboard stationary seal unit and provides an emergency sealing device. When the ship is afloat this seal should be activated when it is necessary to remove or replace a seal component, or should the mane seal be accidentally damaged. When inflated, it forms a liquid tight joint around the shaft.

Seals that are partially split, incorporate an unsplit mounting ring and face carrier therefore initial installation must be made with the shaft withdrawn and prior to fitting the propeller. Subsequent repairs are not prejudiced, since all components liable to wear, damage or deterioration can be replaced by fully split components without disturbance of the shaft or the propeller.

Fully split seals can be fitted without removing the shaft or propeller.

The following instructions cover every aspect of installing "M" series seals for both water and oil lubricated bearings.

ManeSeal and ManeBrace are Trade names of John Crane International.

2. PREPARATION

1. Prior To Installation:

(a) When handling "M" series type seals it is essential that the sealing faces are protected from damage.

· (b) Remove any burrs and clean area of bulkhead and stern tube to which seals will be fitted.

(c) Remove any burrs and clean the surface of the shaft thoroughly, finishing with medium emery paper, in the vicinity of the seat and drive clamp ring of the inboard seal.

(d) Smear all threads with a suitable anti-sieze compound.

2. Seat Machining:

Outboard seats are normally supplied 10 mm over length to allow for variations in seal envelope, notes on machining on General Arrangement Drawing should be read to ensure correct seal compression.

These areas are to be thoroughly cleaned prior to installation

Shaft Liner Remo·Je a 11 Burrs

3. SAFETY SUMMARY

GENERAL SAFETY NOTICES:

The following general safety precautions should be understood and applied during the operation and maintenance of equipment covered herein. Should situations arise that are not covered in these general safety precautions, the Commanding Officer or other authority shall issue orders as deemed necessary to cover the situation.

1. Install and ground all electrical components associated with this system/equipment in accordance with applicable USCG regulations and approved shipboard practices.

2. Ensure that all maintenance operations comply with proper USCG regulations and procedures.

3. Ensure that any protective guards and shutdown devices are properly installed and maintained around rotating parts of machinery and high voltage sources.

4. Do not wear loose clothing while working near rotating parts of machinery.

5. Ensure that special precautionary measures are employed to prevent applying power to the system/equipment at any time maintenance work is in progress.

6. Do not make any unauthorized alterations to the equipment or components.

7. Before working on electrical systems/equipment, check with voltmeter to ensure that system is not energized.

8. Consider all circuits not known to be "dead". live and dangerous at all times.

9. When working near electricity, do not use metal rules, flashlights, metallic pencils or other objects having exposed conducting material.

1 0. De-energize all equipment before connecting or disconnecting meters or test leads.

11. When connecting a meter to terminals for measurement, use range higher than expected voltage.

12. Before operating equipment or performing any test or measurements, ensure that frame of all motors and starter panels are securely grounded.

13. Ensure that area is well ventilated when using cleaning solvents. Avoid prolonged breathing of fumes and solvent contact with skin or eyes.

DO NOT REPAIR OR ADJUST ALONE

Under no circumstances should repair or adjustment of energized equipment be attempted alone. The immediate presence of someone capable of rendering aid is required. Before making any adjustments, be sure to protect against grounding. If possible, adjustments should be made with one hand, with the other hand free and clear of equipment. Even when power has been removed from equipment circuits, dangerous potentials may exist due to retention of charges by capacitors. Circuits must be grounded and all capacitors discharged prior to attempting repairs.

MOVING EQUIPMENT

Personnel shall remain clear of moving equipment. If equipment requires adjustment while in motion, a safety watch shall be posted. The safety watch shall have full view of operations being performed and immediate access to controls capable of stopping equipment motion.

ROTATING MACHINERY

Exercise caution and do not wear loose clothing when working around activated or rotating machinery. The system is designed for automatic operation and motor driven equipment can energize without warning.

Before maintenance is performed on motor driven equipment, personnel should de-energize, isolate and tag the equipment at the control panel.

LIVE CIRCUITS

Use extreme caution when servicing the equipment or even working in the vicinity of its live circuits. Potentially fatal voltages are present. Personnel should observe all safety precautions and regulations and should never work alone. Personnel working near or with these circuits should be familiar with up-to-date resuscitation methods. In some instances, defective components can be replaced without disconnecting electrical power from the equipment.

Only authorized maintenance personnel should isolate defective components by the operation of a selector switch or by removing electrical leads ar a terminal point. Personnel must appropriately tag selector switches when de-energizing motor driven equipment.

FIRST AID

An injury, no matter how slight, shall never go unattended. Always obtain first aid or medical attention immediately.

RESUSCITATION

Personnel working with or near high voltage should be familiar with approved methods of resuscitation. If anyone is injured and stops breathing, initiate resuscitation immediately and send for a physician. A delay could cost the victim's life.

4. INSTALLATION -SHAFT "IN" SITUATION:

1. Mane Seal Inboard

The seal is delivered fully assembled and therefore if the shaft is already installed, the seal must first be carefully dismantled by removing all butt bolts, etc.

If the sea\ can be threaded along the shaft without dismantling then refer to Paragraph 4(a) INSTALLATION Chapter 1. "Tailshaft Removed", otherwise continue below.

When dismantling the seal, before installation , it is important to note or record the relative radial positions of the seal components and joint lines. This will ensure correct re-assembly when fitting the seal around the shaft.

The re-assembly of the seal around the shaft from the mounting ring up to the face is the same on both inboard and outboard seals.

(a) Mounting Ring With Inflatable Seal:

Place half the mounting ring around the shaft and pass the second half under the shaft and lift into position. Insert the butt bolts, engage three turns of thread, clean the butt faces and apply joining compound. Tighten the butt bolts ensuring that the joints are not stepped. Remove any excess joining compound on mounting ring faces.

The inflatable seal must be fitted before completion of the same seal.

Installation is under "4 INFLATABLE SEAL" at the end of this section.

(1a) Mounting Ring Without Inflatable Seal

Place half of the mounting ring around the shaft and pass the second half under the shaft and lift into position. Insert the butt bolts, engage three turns of thread , clean the butt faces and apply joining compound.

Tighten the butt bolts, ensuring that the joints are not stepped.

Remove any excess joining compound on mounting ring faces.

The mounting ring can now be secured to the stern tube with its gasket and bolts, ensuring all pipe connections and the poker gauge access hole are in their correct positions (refer to General Arrangement Drawing for positions).

Lightly grease the gasket and engage the spigot location.

If there is no spigot location, the mounting ring should be centered around the shaft and dowelled into position. Tighten mounting ring bolts/nuts evenly.

(b) Face Carrier

Place the two halves of the face carrier around the shaft. Insert the butt bolts, engage three turns of thread, clean the butt faces and apply joining compound.

Tighten the butt bolts ensuring that the joints are not stepped. Wipe off any excess joining compound.

Center the face carrier on the shaft, if necessary, using suitable wood chocks.

The gap to be left between the mounting ring and the face carrier is shown on the General Arrangement Drawing.

(c) Support Springs

Starting at bottom dead center, tap the ends of the support springs into the grooves in the mounting ring and face carrier: Continue on around, snapping each spring, in turn, into the grooves and finishing back at bottom dead center as shown.

To secure the joining, tape across four springs, ie. two springs either side of the joining.

RETAINING GROOVES

S...rf'ORT SPRINGS

WOODEN CHOCKS

( !F REOUlRED)

~ John Crane Marine USA

Beginning and end of Suppo rt Spring Assembly e nd spr ings tapcc in grooves

SUPPORT SPR i i'1G ASSE,,:BLY

NOTE: Diagram shown inverted for clarity.

(d) lnterlayer

The start of the interlayer is important as the folded end determines the position of the main clamp ring butts, (See General Arrangement Drawing for position).

NOTE: Spares supplied by Deep Sea Seals come correctly rolled and ready to fit.

Pre formed End

INTERLAYER

Interlaye r

Place the coil on the support spring as shown below:

! NTERLAY(R

SUPPORT S??.iNGS

Secure the free end with three strips of adhesive tape, each 600mm long, with one strip on the top and one in each hollow as shown.

Wrap the interlayer around the support spring, working it slowly with maximum tension, keeping it centered and free from creases. The interlayer should make three complete turns of the support springs and have an overlap with the start.

Finish by securing the end of the interlayer to the top surface with three strips of tape, that are long enough to make one complete turn of the interlayer as shown.

'F John Crane Marine USA

FIX ING TAPES

INTERLAYC:R

(e) Bridging Springs

Place one plastic covered bridging spring to hold the end of the interlayer and to fit snugly behind the swelling caused by the folded end of the interlayer.

Equally space the remaining bridging springs around the interlayer. They must bridge the gaps between the backing spring segments when these segments are positioned.

(f) Backing Springs

Grease the inside of each segment using a general purpose grease. Take two of the plastic covered backing spring segments with the main clamp rings .and position them over the interlayer so that the ends rest, centered, on the bridging springs.

SPRING

BACKING SPRING

MAIN CLAMP RING

'8 John Crane Marine USA

Ensure the numbers stamped in the main clamp rings are matched. Insert two of the butt bolts and nuts but do not tighten. A gap should be left at the butts.

Position the remaining segments and butt bolts. Progressively tighten all of the bolts, ensuring the gaps at the butts remain equal as they close, and that the bridging springs remain correctly positioned. Torque the bolts to the figure shown on the General Arrangement Drawing.

Finally, remove the wood chocks supporting the face carrier, fit the compression tools to the main clamp ring butt bolts and insert the compression studding supplied, apply fitting compression. Test inflatable seal. (See Chapter 6).

QJ,ain Cl,.mp

& Nuts SELLO\i CmlPRESSIO~

(COMPRESSION TOOL DRAWING)

(g) Face

To fit the split face, clean and grease the recess in the face carrier. Insert the face sealing strip into the recess with the radius edge last on the inside diameter as shown.

RADIUS ON FACE SEALING STRIP

John Crane Marine USA

To overcome the excess length, the strip ends should be butted and the excess rubber slowly worked into the recess.

FACE SEAL! i'-1 G

STR\P

00 I~OT REMOVE

THIS EXCESS

NOTE: The face sealing strip is supplied overlength to ensure that the ends butt hard together and must not be shortened.

Grease the face on the surface that is located by the face sealing strip (See General Arrangement Drawing).

Take one half of the face and insert it into the recess, rotate the face slightly, if necessary, to engage the drive pins. Ensure the face sealing strip joint does not coincide with the joint on the face or the face carrier.

Insert the other half face and press both halves squarely home with the hands.

If additional force is required, carefully tap home with a mallet using a piece of wood to protect the exposed face. The split joint on the face must be flat, ie.

undetectable with the finger nail.

(h) Ensure that the shaft is clean as detailed in "Preparation".

Clean the butt joints of the seat and grease the "0" Cord grooves. Press the split "0" Cords into the grooves in one half of the seat with their ends hanging free and staggered.

Place this half of the seat, complete with the "0" Cords over the shaft, within 50mm of the face ensuring that the "0" Cords remain in their grooves and are not trapped.

NOTE: The "0" Cords are supplied overlength, to ensure their ends butt hard together and must not be shortened.

Pass the second half of the seat under the shaft and lift into position, ensuring that the "0" Cords do not become trapped. This operation requires extreme care and is more easily accomplished with assistance.

Once it is certain that the ''0" Cords are correctly positioned in the grooves ·and are not trapped at the butts, insert the butt bolts three full threads only.

Clean the seat butt faces.

Apply joining compound to the seat butt faces and close the joints but do not completely tighten the butt bolts. While closing the joints, ensure that the "0:

Cords remain correctly positioned and do not become trapped between the seat butts. Wipe excess joining compound from the seat face. The face and seat running faces should be thoroughly cleaned with a general use solvent cleaner.

12.1

Tighten the seat butt bolts. Push the seat along the shaft until it touches the face.

NOTE: There should be no detectable step at the butt joints with the fingernail , after the seat butt bolts have bee tightened.

U) Drive Clamp Ring Assembly

Ensure the shaft: \n the way of the drive clamp ring is dean and free from grease. Place the two halves of the drive clamp ring around the shaft. Insert the butt bolts but do not tighten .

Position the drive clamp ring as close to the seat as possible, without touching , engage the drive bolts in the recessed bosses on the seat and tighten the butt bolts to the correct torque (See General Arrangement Drawing) to clamp the two halves of the drive clamp ring to the shaft.

Screw the alignment bolts up to the seat. Remove the compression studs and tools.

(k) Seat Alignment

Mount a clock gauge to register against the face of the seat or the machined face of the face carrier. (See Parts list 'for Specia\ Too\ Requirements).

Rotate the shaft slowly and tighten up on the drive and alignment bolts until the seat has been set to give a maximum of 0.25 mm total indicated reading .

On completion check that bellows compression is within 1 mm of the designed fitting compression (refer to General Arrangement Drawing} and tighten up the locknuts on the drive and alignment bolts.

Check the compression and record the measurement of the gaps between each of the sets of main clamp ring lugs for the purpose of assessing seal wear.

Finally. make any connections to the mounting ring and face carrier that are required.

NOTE: It is important that if pipes are fitted to the face carrier that flexible hoses, at an appropriate point, are used.

(I) Splash Guard

Locate the splash guard around the face carrier, ensuring that the drain hole is at the bottom dead center.

2. INFLATABLE SEAL

Degrease the butts of the inflatable seal and place it around the shaft behind the mounting ring. Apply a suitable cyanoacrylate adhesive to the butts, in accordance with the manufacturer's instructions. Join the butts ensuring there is no step at the joint.

·Carefully insert the support ring into the inflatable seal ensuring that butt joints are not coincidental.

lnflzcable Seal

I NFLATABLE SEAL ASSEM5LY

Lightly grease the inflatable seal recess in the rear of the mounting ring.

Insert the inflatable seal, initially entering the leading edge of the rubber all around.

NOTE: The inflatable seal is supplied overlength to ensure good butting and must not be shortened.

Secure the adaptor ring in position and tighten the bolts.

Complete build up of seal bellows assembly (See Chapter 1 Mane Seal Inboard).

Now test the inflatable seal with air or liquid at 2-3 Bar. A slight leak from this seal is acceptable. The inflatable seal should also be completely down on the shaft all the way around.

NOTE: Before connecting the air supply pipe to the inflatable seal connection, blow through well to ensure that all loose scale has been removed .

Now continue with "(g) Face" under 1 MANE SEAL of this section.

3. OUTBOARD SEAL

The procedure for assembling the outboard main seal is the same as previously described under Section 3 INSTALLATION 1. Mane Seal (1 a) to (g).

(a) Seat

Before assembllng the seat around the shaft, ensure that the gasket propeller sealing cord and backing ring, if required, are in position and that the seat has been machined to correct length (See Section 2.2). The propeller sealing cord should be a snug fit around the shaft. It may be necessary to increase the sea! compression to allow room for the seat spigot to enter.

Place the seat halves around the shaft and insert the butt bolts. Before t ightening, clean the butt faces and coat them with sealing compound .

NOTE: There should be no detectable step at the butt joints with the fingernail, after the seat butt bolts have been tightened.

Secure the seat to the propeller boss or flange (refer to the General Arrangement Drawing).

The face and seat should be cleaned with a general solvent cleaner. Remove compression tools and studding and retain these for future use. Check to ensure the overall length of the seal is correct. (Refer to General Arrangement Drawing). Check the torque and re-tighten, if necessary, the main clamp ring butt bolts.

Finally, record the measurement of the gaps between each of the sets of main clamp ring lugs for the purpose of assessing seal wear.

4a. INSTALLATION- TAILSHAFT REMOVED SITUATION

1. PARTIALLY/FULLY SPLIT SEALS WITH TAILSHAFT REMOVED

NOTE: The inflatable seal supplied with a fully split seal is NOT bonded and must be assembled as in Section 3 INSTALLATION, 2 "Inflatable Seal" BEFORE whole assembly is bolted to stern tube.

Only the inboard seat seal, drive clamp ring and splash guard should be removed prior to assembly. These are split components and are fitted after installation of the tailshaft.

The seals should be threaded along the shaft, where necessary, with all relevant gaskets, as the shaft is installed in the vessel. Once the shaft is in approximately the correct position, lightly grease the gaskets and engage the spigot locations of the mounting rings, ensuring all liquid connection and the poker gauge access holes are in their correct positions. (Refer to the General Arrangement Drawing for specific positions). If there is no spigot location, center the mounting ring around the shaft and dowel in position.

Finally, tighten mounting ring bolts/nuts evenly.

2. OUTBOARD SEAL

(i) For Taper Mounted Propellers

Prior to fitting the propeller, the shaft should be entered into the stern bearing. Apply the seal compression using the special tools and studding supplied (refer to General Arrangement Drawing for method of compression and seal working length). Slide the seat gasket, propeller sealing cord and backing ring (if fitted) in position over the end of the shaft. The propeller sealing cord should be a snug fit around the shaft.

Clean the face and seat prior to finally positioning propeller.

With the propeller in position fit the backing ring (if fitted), 0 cord, seat and gasket to the propeller.

Remove compression tools and studding and retain these for future use.

Check to ensure the overall length of the seal is correct. (Refer to General Arrangement Drawing).

Finally, record the measurement of the gaps between each of the sets of main clamp ring lugs for the purpose of assessing seal wear.

(ii) For Flange Mounted Propellers

Once the tailshaft is within one meter of its final position the seat can be secured to the propeller boss or flange (Refer to General Arrangement Drawing) with its gasket and bolts. The face and seat should be cleaned on their rubbing faces before moving the shaft to its final working position and releasing the compression.

Remove compression tools and studding and retain for future use. Check to ensure the overall length of the seal is correct. Check the torque and tighten, if necessary, the main clamp ring butt bolts.

Finally, record the measurement of the gaps between each of the sets of main clamp ring lugs for the purpose of assessing seal wear.

3. INBOARD SEAL

If an inflatable seal is fitted refer to "3a INSTALLATION (NOTE)" and "5 INFLATABLE SEAL" before continuing with the seal assembly below.

During installation of the tailshaft, thread the inboard seal (Jess the seat and drive clamp ring) along the shaft to its approximate position. When the tailshaft is secured in its final position, bolt the seal mounting ring to the stern bush using a 1 mm gasket ensuring that it is concentric to the shaft.

(a) Seat

See "3 INSTALLATION Paragraph h".

(b) Drive Clamp Ring

See "3 INSTALLATION Paragraph J".

(c) Sear Alignment

See "3 INSTALLATION Paragraph k".

5. INFLATABLE SEAL

Once the inboard seal is secured and the tailshaft is in its final position, test the inflatable seal with air or liquid at the specified test pressure. The inflatable seal should be tight on the shaft. A slight leak from the seal is acceptable.

NOTE: Before connecting the air supply pipe to the inflatable seal connection, blow through well to ensure that all loose scale has been removed.

John Crane Marine USA

Air Supply

Service air at a pressure of 5 Bar must be available, via a suitable control system, for the operation of the inflatable seal.

A typical control system is indicated in the diagram below.

GAUGE

- - -------'~ l 9 SUPPLY -p--U ... _J

PRESSURE

REDUCING

VALVE

DIRECTIONAL

Jl CONTROL GAUGE

Q VALVE I

lJd INFLATABLE r

VENT

?1\ SEAL

: DRAIN.

I

An air vent or drain must be provided in the operating system which must be kept open at all times when the inflatable seal is not in use.

If a liquid is used as the operating medium, it is advisable that the drain should be fitted at bottom dead center to ensure that the seal is properly drained.

Now continue with "(h) Seat in 3 INSTALLATION, 1 MANE SEAL".

6. TESTING

(a) MAIN SEALS

Upon completion a static test may be applied.

For test pressures applicable to the seal refer to the General Arrangement Drawing.

(b) INFLATABLE SEALS

Refer to "5 INFLATABLE SEAL in the last section.

7. MAINTENANCE

1. Wear Assessment

When installing the seal, initially or after refit, the distance between each of the main clamp ring lugs should be measured and recorded.

Subsequently, the overall wear, i.e. on face and seat, can be assessed by checking measurements between the main clamp ring lugs and comparing these against the initially recorded measurements. When the measurement differs from the initially recorded measurement by more than 0.236 inches, the Face should be replaced.

2. FACE AND SEAT

The face may be replaced with a new split face replacement. The seat may also be replaced but normally it only requires skimming to clean off the old rubbing surface. Follow the procedures below.

(a) Inboard Seals

Close the valve supplying water to the stern tube bearing and main seal and operate the inflatable seal (if fitted) .

Open the drain on the main seal and drain off remaining fluid.

Fit compression tools and tighten to hold bellows to its normal fitting compression. Remove splash guard. Slacken butt bolts, securing the two halves of the drive clamp ring, and slide the drive clamp ring along the shaft.

Loosen and remove seat butt bolts and remove seat.

Carefully lever out the face and remove together with the face sealing strip. If the face is a solid ring, to remove it from the shaft, it must be cut in halves.

(b) Outboard Seals

The vessel must be dry docked or tipped. Drain the oil or water from the stern bearing.

Fit compression tools and tighten until the face is clear of the seat allowing enough clearance (refer to General Arrangement Drawing) for the seat spigot (if fitted). Loosen seat butt bolts and mounting bolts and remove seat. Carefully lever out the face and

·~ John Crane Marine USA

(c) Inboard and Outboard Seals (reassembly)

For both inboard and outboard seats, reassemble the two halves and tighten the butt bolts. Clamp the seat to a suitable face plate and machine the face of the seat to a fine finish, removing all wear tracks. Care should be taken to avoid distortion during the machining operation and to ensure that the butt joints are not stepped.

If a new face is being fitted, ensure the correct replacement face has been obtained as inboard and outboards seals are not interchangeable.

The old face sealing strip should be discarded and a new one obtained is a new face is to be fitted .

To fit a new face on both inboard and outboard seals, clean and grease the recess in the face carrier. Insert the new face sealing strip into the recess with the rad ius edge last on the inside diameter.

RADlUS

To overcome the excess length, the strip ends should be butted and the excess rubber slowly worked into the recess.

NOTE: The face sealing strip is supplied overlength to ensure that the ends butt tightly together and must not be shortened.

Grease the new face on the surface that is located by the face sealing strip.

Take half of the new face and insert it into the recess, rotate the face slightly, if necessary, to engage the drive pins.

Ensure the face sealing strip joint does not coincide with the joint on the face.

Insert the other half face and press both halves squarely home with the hands. If additional force is required, carefully tap home with a mallet using a piece of wood to protect the exposed face. The split joint on the face must be flat i.e. undetectable with the fingernail.

Refit seat and the drive clamp ring on inboard seals as covered in "INSTALLATION". Refitting seat on outboard seals is the reverse of removal, but joining compound must be used on the butt joints. Ensure all sealing surfaces are cleaned before assembly and lightly grease gaskets.

3. INFLATABLE SEAL

The only maintenance required on inflatable seals is a regular, periodic test. Experience has shown that the pipe systems supplying air to the inflatable seal, especially where ferrous materials have been used, are subject to scaling which can affect operation of the seals .

It is important, accordingly, to check at regular intervals, preferably every six months, to ensure that the pipe system is clear and that the inflatable seal operates satisfactorily.

4. MAJOR OVERHAUL

After four or five years the seals should be inspected thoroughly both inside and out. Should a major loss (>0.500 inches from original) of free length or any signs of damage be found, the bellows assembly must be replaced . The bellows assembly should be replaced every eight to ten years regardless of condition.

The face and seat should be replaced or reconditioned as required.

The minimum spares requirement for the major overhaul of the seal assembly is as follows:

Inboard Seals

1 face 1 face sealing strip 1 bellows assembly 1 interlayer 2 seat "0" rings 1 inflatable seal (if fitted)

Outboard Seals

1 face 1 face sealing strip 1 bellows assembly 1 interlayer

8.

PARTS LIST

Part Number Nomenclature Quantity

H81830-A01 Mounting Ring 1 H81831-A01 Adaptor Ring 1 H81861-A05 Screw 18 H81859-A16 Support Ring 1 CM1138-M035* Inflatable Seal 1 H46059-A02 Main Clamp Ring 1 H44255-3-A05 Screw 6 H48422-9-A05 Nut 6 H42930-529-1-D10* Support Spring Assy 1 H42930-78-4986-F14* Interlayer 1 H43923-529-D10* Bridging Spring Assy 1 H42930-529-4-D10* Backing Spring Assy 1 H81829-A01 Carrier 1 H40673-2131-F22 Guard 1 H87997-G91 Face (non-split) 1 H41863-1917-F03* Sealing Strip 1 H86561-G91 Face (split) 1 H81826-A03 Seat (split) 1 H44254-5-A05 Screw 4 H43381-7-A06 Seat Dowel 2 H48402-1-D23 Spring Pin 2 H45112-3-1505-FD3* O-Cord 2 H81825-A01 Drive Clamp Ring 1 H44254-7-A05 Screw 2 H44205-2-A05 Drive Screw 2 H44206-1-A05 Screw 4 H48422-6-A05 Nut 6 H81860-A05 Screw 4 H72579-01-CT Compression Tool Assy 1 H72579-01-TK Tool Kit 1

* Recommended Spares for One Year Period

Tool Kit H72579-01-TK is sold as a kit only; and is not sold separately. The kit consists of the following items each having a quantity of one.

ToolBox ~"Allen Key 5/8" Allen Key ~" Sq. Dr. Ratchet 15/16", ~" Sd Socket] Anti-Seize Compound PVC Tape

Padlock Open End Wrench 15/16" x 1-1 /2" Open End Wrench 1-15/16" X 1-1 5/8" Hex Adaptor 12mm Wide Tape Silastic732 Sealant Loctite406 Adhesive

SPECIAL TOOLS AND TEST EQUIPMENT

Torque Wrench~" Drive 0-300 foot pounds

Clock Gage This gage, which is also known as a dial caliper, is used to check the concentricity of the seal, in way of the shaft. The gage should attach to the bulkhead; and should be able to measure this concentricity in thousanths.

Change l 25

9. GENERAL ARRANGEMENT DRAWINGS

DRAWING NO. US72579-01 sheet 1 of 2 DRAWING NO. U$72579-01 sheet 2 of 2

DRG NO: 2 INCHES FULL SIZE 1ST ANGLE PROJECTION

DWG NO: REV:

SHEET:

Print is property of Deep Sea Seals Ltd subject to return upon demand. Title to same never sold or transferred for any reason. All rights to invention reserved.

Copyright � Deep Sea Seals 2002

Deep Sea Seals Ltd

ENGINEERED SEALING SYSTEMS

SIZE:

TITLE:

D

18.000 inch TYPE MB SEAL

U.S. COASTGUARD (WLB)

SEAGOING BUOYTENDERS

OF 2

US72579-01

INSTALLATION

REVISIONS

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

S

T

U

V

W

X

Y

Z

AA

AB

AC

AD

24 Nov 1993

24 May 1994

7 Jan 1999

16 Oct 2003

US72579-01 SEAL CODE: 42930/529/41/598.2/38/75/41863/FL = 362.7 ± 3.3 ACCESS CODE: ALLL

D

NAVAL SEA SYSTEMS COMMAND

CONTRACT NO:

DRAWN BY:

CHECKED BY:

APPROVED BY:

DATE:

APPROVED SIGNED DATE

PROJ ENGR

BR HD

DIV HV

24 Nov 1993

OSYN4

CODE IDENT NO:

SCALE: UNIT WEIGHT:-

REV. DESCRIPTIONS APP. DATE APP.LTR.

(ORIG 25/11/93

(2-10052)

(3-10412)

A (4-10338)(A-10338 5/94

B ECN JCMI 94-0017 (B-10643) 5/94

C DSS MOD 1/99

D DSS MOD 16/10/03

REVISIONS

INSTALLATION

8-6 5/8" - 11 63

8-2 1" - 8 184

2-2 1" - 8 75

1-3 7-2 5/8" - 11 70

DRG

POSn

THREAD

UNC

TORQUE

FT LBS

Change 2

1fl6" JOINT

(CUSTOMER SUPPLY)

C 12x ) 3/ 4"-1 0 UNC

& NUTS EQUISPACED

CENTRES ON 27 . 000

(CUSTOMER SUPPLY)

r- 3/4

RADIAL

'-- ¢ 1 8. 000 ±. 00 3 SHAFT

'-- ¢25.000 +-~12 BORE

¢29.000

EH~

~-------------------------------------------------18.500 APPROX OVERALL LENGTH------------------------------------------------~

~------------------- WORK J NG LENGTH = FREE LENGTH M J NUS 0. 3 9 4 ± 0. 0 3 9 --------------------------~

1----~-t- 1 . 0 0 0 (2x) 3/ 8" FLANGES (MIL-F-20042C-l50lbs)

AIR CONNECTIONS TO INFLATABLE SEAL

SPACED DIAMETRICALLY OPPOSITE

(2x) 1" FLANGES (MIL-F- 20042C-1501bs)

VENT AT T. D. C.

FLUSH/DRAIN AT B.D.C.

L 2. 560

SETTING

DIMENSION

J

DRAIN AT B.D.C.

NOTES

1. ALL DIMENSIONS IN INCHES.

2. ALL COMPONENTS MAY BE REMOVED WITHOUT DISTURBING THE SHAFT

WITH THE EXCEPTION OF ITEMS H7 2579-0l-1 & H72 579-01-4.

3. EXACT SHAFT AND / OR LI NER DIAMETERS MUST BE SUPPLIED BY CUSTOMER.

4. VENT INFLATABLE SEAL TO ATMOSPHERE WHEN NOT IN USE.

5. INFLATABLE SEAL TEST PRESSURE = SEE T. D. S. 2/001

6- WEIGHT = 869 LBS

SERVICE DATA

SERVICE ..

TEMPERATURE

REV / MIN ..

PRESSURE.

FLOW ..

SEAL PARAMETERS

SEAWATER

28' TO 90'F

10FT DRAFT

15 G.P.M. (10 G.P.M. MIN)

FITTNG COMPRESSION

MAX OPERATING COMPRESSION

MIN OPERATING COMPRESSION

MAX RADIAL MOVEMENT

MAX AXIAL MOVEMENT

VIEW ON ARROW 'A ' SHOWING

COMPRESSION TOOL ASSEMBLY

LOCKED FOR TRANSIT PURPOSES

REMOVE BEFORE ROTATING SHAFT -280 MIN. 09 / 16"

SEE

NOTE 7.

7. HOLES FOR ITEM 8-6 TO BE DRILLED IN SITU USING ITEM 8-1 AS TEMPLATE.

VIEW SHOWING METHOD OF

LOCKING DRIVE CLAMP RING

TO SHAFT AND ALIGNING SEAT

DRG NO: 2 INCHES FULL SIZE 1ST ANGLE PROJECTION

DWG NO: REV:

SHEET:

Print is property of Deep Sea Seals Ltd subject to return upon demand. Title to same never sold or transferred for any reason. All rights to invention reserved.

Copyright � Deep Sea Seals 2002

Deep Sea Seals Ltd

ENGINEERED SEALING SYSTEMS

SIZE:

TITLE:

D

18.000 inch TYPE MB SEAL

U.S. COASTGUARD (WLB)

SEAGOING BUOYTENDERS

US72579-01

INSTALLATION

REVISIONS

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

S

T

U

V

W

X

Y

Z

AA

AB

AC

AD

24 Nov 1993

24 May 1994

7 Jan 1999

16 Oct 2003

US72579-01 SEAL CODE: 42930/529/41/598.2/38/75/41863/FL = 362.7 ± 3.3 ACCESS CODE: ALLL

D

NAVAL SEA SYSTEMS COMMAND

CONTRACT NO:

DRAWN BY:

CHECKED BY:

APPROVED BY:

DATE:

APPROVED SIGNED DATE

PROJ ENGR

BR HD

DIV HV

24 Nov 1993

OSYN4

CODE IDENT NO:

SCALE: UNIT WEIGHT:-

REV. DESCRIPTIONS APP. DATE APP.LTR.

(ORIG 25/11/93

(2-10052)

(3-10412)

A (4-10338)(A-10338 5/94

B ECN JCMI 94-0017 (B-10643) 5/94

C DSS MOD 1/99

D DSS MOD 16/10/03

REVISIONS

INSTALLATION

H87997-G91

H86561-G91

MANETEX 22

MANETEX 22

.. John Crane Marine USA

APPENDIX I

'H'Series Seals fall into two basic categories

1. The ~aneseal for water ap9lications.

2. The manebrace for oil ap?lications.

TYPE INBOARD/ CONFIGURATION LUBRICATION P_DDITIONS.

OUTBOARD

HA" INBOARD FULLY SPLIT WATER WITH INFLA.T;..BLE SEAL

MB INBOARD PARTIALLY SPLIT WATER WITH INFLATABLE SEJI..L

HD INBOARD PARTIALLY SPLIT WATER WITH TN:L.~TABLE SEAL

!19 /M"..<9 INBOARD FULLY SPLIT WATER AUXILLERY PACKING PROVISION

WITH Hi'FLATABLE SE.AL l".X4 OUTBOARD PARTIALLY SPLIT WATER

HANEBRACE

HC OUTBOARD PARTIALLY SPLIT OIL/WATER "COP..STGUARD" WITH

INTERNAL LIP SEALS

ML INBOARD PARTIALLY SPLIT OIL

MLX INBOARD FULLY SPLIT OIL

HN OUTBOARD PARTIALLY SPLIT OIL

MNx OUTBOARD FULLY SPLIT OIL

ME INBOARD FULLY SPLIT OIL SAHE AS MLX

MF OUTBOARD FULLY SPLIT OIL SP..HE AS HN"..<

APPENDIX I