S6225-W6-MMA-010 - Fire Pump - Tech Manual.pdf

TECHNICAL MANUAL

FOR

NAVY STANDARD, TITANIUM

CENTRIFUGAL PUMP,

1000 GPM

(NAVSEA DRAWING NO. 803-5773203)

OPERATION, MAINTENANCE, AND ILLUSTRATED PARTS

BREAKDOWN

SUPERSEDURE NOTICE: THIS MANUAL SUPERSEDES S6225-W6-MMA-010,

DATED 15 OCTOBER 2019, AND ALL CHANGES THERETO.

DISTRIBUTION STATEMENT C: DISTRIBUTION AUTHORIZED TO U.S. GOVERNMENT AGENCIES AND

THEIR CONTRACTORS; ADMINISTRATIVE OR OPERATIONAL USE; 30 AUGUST 2006. OTHER U.S.

REQUESTS FOR THIS DOCUMENT SHALL BE REFERRED TO NSWC PHILADELPHIA, CODE 314.

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. DISSEMINATE IN ACCORDANCE WITH THE

PROVISIONS OF DOD DIRECTIVE 5230.25.

DESTRUCTION NOTICE: DESTROY BY ANY METHOD THAT WILL PREVENT DISCLOSURE OF CONTENTS

OR RECONSTRUCTION OF THIS DOCUMENT.

S6225-W6-MMA-010

REVISION 8

TITLE-1 / (ii Blank)@@FIpgtype@@TITLE@@!FIpgtype@@ @@FIpgtype@@TITLE@@!FIpgtype@@

PUBLISHED BY DIRECTION OF COMMANDER, NAVAL SEA SYSTEMS COMMAND

*0910LP1199722* 15 SEP 2020

TITLE-2

@@FIpgtype@@BLANK@@!FIpgtype@@

RECORD OF REVISIONS

REVISION NO. DATE TITLE OR BRIEF DESCRIPTION

0 15 FEB 1985 INITIAL ISSUE.

1 15 AUG 1995 INCORPORATED CHANGE A PACKAGE.

2 30 AUG 2006 INCORPORATE CHANGES RESULTING FROM CVN 77 NEW CON-

STRUCTION. UPDATED PARTS LIST INTABLE 7-2.

3 31 AUG 2009 THIS REVISION DOCUMENTS SHIPALT 6766.02D.

CHANGED INFORMATION INCLUDES THE FOLLOWING:

PARAGRAPH:D

4 15 JUL 2011 THIS REVISION INCORPORATES SCD-79185 (MA-670) WHICH PRO-

VIDES GALVANIC ISOLATION BETWEEN THE TITANIUM PUMP

AND SYSTEM PIPING.

CHANGED INFORMATION INCLUDES THE FOLLOWING:

PARAGRAPHS:6-4., 6-6., 6-7. and8-9.

FIGURE: 8-4

5 30 APR 2012 INCORPORATES TMDER N65540-12-C006 TO CLARIFY

DEENERGIZING AND TAG OUT PROCEDURES. CHANGES AUTHO-

RIZED BY CODES 938 AND 944. THE FOLLOWING WAS CHANGED:

6 15 MAR 2016 ADDED FIRE PUMP EMI FIX KIT AND UPDATED PARTS LIST

DESCRIPTION. THE FOLLOWING WAS CHANGED:

7 15 OCT 2019 TMDER N42192-19-SB02; PROVIDING UPDATES TO BYPASS THE

MOTOR THERMISTOR, AND UPDATED TROUBLESHOOTING PRO-

CEDURES. INCORPORATING UPDATES TO THE FIREMAIN PUMP

AIR RELEASE VALVE AND HOSE, DISASSEMBLY AND REASSEM-

BLY PROCEDURES, SHIPBOARD INSTALLATION, DRAWINGS, AND

PARTS LISTS.

PARAGRAPHS:2-4.1, 3-4., 3-5., 3-5.1, 3-5.1.1, 3-5.1.2, 6-4., 6-6., 6-7.,

6-8., 6-9., 6-9.1, 6-9.1.1, 6-9.1.2, 8-9., A-3.4, A-5.3, A-5.4, A-5.5, A-5.6, A-6.3.1, A-6.3.2, A-6.4.1, A-6.4.2, A-6.5.1, A-6.5.2, A-9.3, A-9.4, A-9.5, C-3.4, C-5.3, C-5.4andC-5.5 FIGURES:7-4, 7-5, 7-6, 7-7 and8-5 TABLES: 7-5, 7-6, 7-7, A-6 andC-5

8 15 SEP 2020 ADDED 1/4-INCH ISOLATION GASKET KIT, PART NUMBER 0.25-

250MPGE/E-N/M, FOR 1/4-INCH VENT CONNECTION IN SUPPORT OF

CVN 73 RCOH.

THE FOLLOWING WAS CHANGED:

PARAGRAPHS:1-3., 6-4., 6-6., 6-7., 8-6., 8-7.2, 8-9. and8-10.

TABLES: 6-2 and7-2

FOR OPTIMAL VIEWING OF THIS TECHNICAL MANUAL, THE PAGE LAYOUT IN ADOBE ACROBAT

READER SHOULD BE SINGLE PAGE. CONTINUOUS PAGE DISPLAY CAN CAUSE PROBLEMS WITH

LINK REFERENCES AND THE BOOKMARKS.

S6225-W6-MMA-010

FOREWORD

This technical manual provides description, operation, maintenance, troubleshooting, repair, and parts list information for the Navy Standard, Titanium Centrifugal pump, 1000 gpm (NAVSEA Drawing No. 803- 5773203). This technical manual is intended for guidance of and use by personnel operating and maintaining the equipment described herein.

This manual consists of one volume arranged in eight chapters and four appendices as follows:

Chapter 1- General Information and Safety Precautions

Chapter 2- Operation

Chapter 3- Functional Description

Chapter 4- Scheduled Maintenance

Chapter 5- Troubleshooting

Chapter 6- Corrective Maintenance Section I. Introduction Section II. Adjustments and Alignment Section III. Repair

Chapter 7- Parts List

Chapter 8- Installation

Appendix A - Hansome, General Electric, and Mawdsley’s Limited Motors

Appendix B- Tech Systems Motor Data For LSD 41 Class (CV)

Appendix C- Reliance Electric Motor

Appendix D- Cutler-Hammer Motor Controller 6962ED3264

Ships, training activities, supply points, depots, Naval Shipyards and Supervisors of Shipbuilding are requested to arrange for the maximum practical use and evaluation of NAVSEA technical manuals. All errors, omissions, discrepancies and suggestions for improvement to NAVSEA technical manuals shall be forwarded to:

COMMANDING OFFICER

CODE 310 TMDERs

NAVSURFWARCENDIV NSDSA

4363 MISSILE WAY BLDG 1389

PORT HUENEME, CA 93043-4307

on NAVSEA/SPAWAR Technical Manual Deficiency/Evaluation Report (TMDER), NAVSEA form 4160/1. All feedback comments shall be thoroughly investigated and originators will be advised of action resulting there-from. One copy of NAVSEA form 4160/1 is at the end of each separately bound technical manual 8-1/2 x 11 inches or larger. Copies of NAVSEA form 4160/1 may be requisitioned from the Naval Systems Data Support Activity Code 310 at the above address. Users are encouraged to transmit deficiency submittals via the Naval Systems Data Support Activity Web site located at:

https://nsdsa.dc3n.navy.mil i / (ii Blank)

FOREWORD-2

TABLE OF CONTENTS

Chapter/Paragraph Page

1 GENERAL INFORMATION AND SAFETY PRECAUTIONS . . . . . . . . . . . 1-1

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

1-2. SAFETY PRECAUTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2.1 Danger/Warning/Caution/Note Definitions. . . . . . . . . . . . . . . . . . . . . 1-1 1-2.2 Additional Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1-3. EQUIPMENT DESCRIPTION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1-4. RELATIONSHIP OF COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1-5. REFERENCE DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2-2. SAFETY PRECAUTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2-3. CONTROLS AND INDICATORS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2-4. OPERATING PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-4.1 Pre-Operational Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-4.2 Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-4.3 Inspection.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-4.4 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

3 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3-2. PUMP DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.1 Casing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.2 Seal Head.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.3 Wearing Rings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.4 Impeller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2.5 Shaft Seal.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3-3. PUMP OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3-4. PUMPING UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3-5. FIRE PUMP AIR RELEASE VENT VALVE.. . . . . . . . . . . . . . . . . . . . . . . 3-3 3-5.1 Fire Pump Air Release Vent Valve. . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3-5.1.1 Automatic Air Release Vent Valve . . . . . . . . . . . . . . . . . . 3-3 3-5.1.2 Manual Air Vent Valve. . . . . . . . . . . . . . . . . . . . . . . . . 3-3 iii

TABLE OF CONTENTS - Continued

4 SCHEDULED MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-2. PREVENTIVE MAINTENANCE SCHEDULE. . . . . . . . . . . . . . . . . . . . . . 4-1

4-3. VISUAL INSPECTION OF THE PUMP MECHANICAL SEAL FOR LEAKAGE. . 4-1

4-4. EXTENDED SHUTDOWN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4-5. GENERAL OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4-6. INTERMEDIATE AND DEPOT LEVEL MAINTENANCE. . . . . . . . . . . . . . . 4-2

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5-2. SAFETY PRECAUTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5-3. TROUBLESHOOTING PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5-4. PRELIMINARY TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-4.1 Common Malfunctions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-4.2 Immediate Action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-4.3 Probable Causes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-4.4 Corrective Action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

5-5. PERFORMANCE MONITORING CHARTS.. . . . . . . . . . . . . . . . . . . . . . . 5-2

5-6. MECHANICAL SCHEMATIC DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . 5-2

6 CORRECTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

SECTION I INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

SECTION II ADJUSTMENTS AND ALIGNMENT. . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6-2. ADJUSTMENTS AND ALIGNMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

SECTION III REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6-3. REPAIR PROCEDURES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6-4. RENEWAL OF WEARING RINGS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 iv

6-5. CASING STUD REMOVAL AND INSTALLATION. . . . . . . . . . . . . . . . . . . 6-10

6-6. RENEWAL OF SHAFT SEAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

6-7. RENEWAL OF IMPELLER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19

6-8. EMERGENCY PACKING INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . 6-27

6-9. AUTOMATIC AIR RELEASE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35 6-9.1 Automatic Air Release Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35

6-9.1.1 Disassembly and Inspection . . . . . . . . . . . . . . . . . . . . . . 6-35

7 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7-2. LIST OF MAJOR COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7-3. PARTS LIST TABLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7-3.1 Figure and Index Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7-3.2 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7-3.3 Quantity.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 7-3.4 Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 7-3.5 Manufacturer’s Part Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

7-4. PARTS LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

8 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8-1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8-2. INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8-3. SITE INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8-4. PREPARATION OF FOUNDATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8-5. REFERENCE DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8-6. TOOLS AND MATERIAL REQUIRED FOR INSTALLATION. . . . . . . . . . . . . 8-1

8-7. UNPACKING AND PACKING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2 8-7.1 Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2 8-7.2 Packing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2 8-7.3 Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

8-8. INPUT REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2 v

8-9. INSTALLATION PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

8-10. INSTALLATION CHECKOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

8-11. ADJUSTMENTS AND TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

8-12. GROUNDING PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

8-13. STARTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

APPENDIX A HANSOME, GENERAL ELECTRIC, AND MAWDSLEY’S LIMITED

MOTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

APPENDIX B TECH SYSTEMS MOTOR DATA FOR LSD 41 CLASS (CV) . . . . . . . . . . . B-1

APPENDIX C RELIANCE ELECTRIC MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

APPENDIX D CUTLER-HAMMER MOTOR CONTROLLER 6962ED3264. . . . . . . . . . . . D-1

vi

LIST OF TABLES

Table Title Page

1-1 Pump Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1-2 Pump Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1-3 Principal Design Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1-4 Equipments, Accessories, and Documents Supplied . . . . . . . . . . . . . . . . . . . 1-3

4-1 Planned Maintenance Schedule (Pump End) . . . . . . . . . . . . . . . . . . . . . . . 4-1

5-1 Pump Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

6-1 Impeller Diameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22

6-2 Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29

7-1 Navy Standard Titanium Centrifugal Pumping Units . . . . . . . . . . . . . . . . . . . 7-1

7-2 Pump Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

7-3 Multi-Spring Mechanical Seal Parts List . . . . . . . . . . . . . . . . . . . . . . . . . 7-9

7-4 Navy Standard Single-Spring Mechanical Seal Parts List . . . . . . . . . . . . . . . . 7-11

7-5 Fire Pump Automatic Air Release Valve and Hose Assembly . . . . . . . . . . . . . . 7-12

7-6 Automatic Air Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15

7-7 Manual Vent Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16 vii

LIST OF ILLUSTRATIONS

Figure Title Page

1-1 Fire Pump - Horizontal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

1-2 Performance Curve - 125 PSI, 750 GPM . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1-3 Performance Curve - 150 PSI, 750 GPM . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

1-4 Performance Curve - 125 PSI, 900 GPM . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1-5 Performance Curve - 125 PSI, 1000 GPM . . . . . . . . . . . . . . . . . . . . . . . . 1-9

1-6 Performance Curve - 150 PSI, 1000 GPM . . . . . . . . . . . . . . . . . . . . . . . . 1-10

1-7 Performance Curve - 175 PSI, 1000 GPM . . . . . . . . . . . . . . . . . . . . . . . . 1-11

6-2 Impeller Balance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

6-3 Method for Checking Impeller Runout . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

6-4 Method for Holding Motor Shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30

6-5 Torquing Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30

6-6 Impeller and Mechanical Seal Retainer Engagement . . . . . . . . . . . . . . . . . . . 6-31

6-7 Pump Assembly/Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33

7-1 Pump Sectional Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

7-2 Multi-Spring Mechanical Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7-3 Navy Standard Single-Spring Mechanical Seal . . . . . . . . . . . . . . . . . . . . . . 7-10

7-4 Fire Pump Automatic Air Release Valve and Hose Assembly . . . . . . . . . . . . . . 7-11

7-5 Pump Automatic Air Release Valve Hose Assembly End Fitting Material Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

7-6 Fire Pump Automatic Air Release Valve. . . . . . . . . . . . . . . . . . . . . . . . . . 7-14

7-7 Fire Pump Manual Vent Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

8-1 Unit Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7

8-2 Resilient Mount Arrangement and Unit Footprint. . . . . . . . . . . . . . . . . . . . . 8-9

8-3 Shipping Arrangement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10

8-4 Galvanic Isolation Component Arrangement (Installed by SCD-79185 (MA-670) or Other Means) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

8-5 Fire Pump Automatic Air Release Valve and Hose Assembly Installation . . . . . . . 8-12

8-6 Seawater Pump Manual Vent Valve Installation. . . . . . . . . . . . . . . . . . . . . . 8-13 viii

SAFETY SUMMARY

GENERAL SAFETY NOTICES

The following general safety notices supplement the specific dangers, warnings, and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during opera-tion and maintenance of the equipment covered herein. Should situations arise that are not covered in the gen-eral or specific safety precautions, the Commanding Officer or other authority will issue orders as deemed nec-essary to cover the situation. No work shall be undertaken on energized equipment or circuits until approval of the Commanding Officer is obtained, and then only in accordance with Naval Ships’ Technical Manual (NSTM) S9086-KC-STM-010/Chapter 300.

DO NOT REPAIR OR ADJUST ALONE

Under no circumstances shall repair or adjustment of energized equipment be attempted alone. The imme-diate presence of someone capable of rendering first aid is required. Before making adjustments, be sure to pro-tect 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 still exist due to retention of charges by capacitors. Circuits must be grounded and all capacitors discharged prior to attempting repairs. Equipment should be deenergized and properly tagged DANGER DO NOT OPERATE per the Tag-Out Users Manual (S0400-AD-URM-010/TUM).

TEST EQUIPMENT

Ensure that test equipment is in good condition. If a test meter must be held, ground the case of the meter before using. Do not touch live equipment or personnel working on live equipment while holding a test meter.

Some types of measuring devices should not be grounded; do not hold such devices when taking measurements.

INTERLOCKS AND SAFETY DEVICES

Interlocks are provided for safety of personnel and equipment and should be used only for the purpose intended. Never tamper with or render ineffective any safety device, interlock, ground strap or similar device intended to protect operators or the equipment without specific approval of the Commanding Officer. Do not depend solely upon interlocks for protection. Whenever possible, disconnect power at the distribution source.

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 be qualified to administer CPR, have a full view of the operations being performed, and have immediate access to controls capable of stopping equipment motion.

FIRST AID

An injury, no matter how slight, shall never go unattended. Always obtain first aid or medical attention immediately, and file an injury report in accordance with OPNAVINST 5102.1 series, subj: Mishap Investigation and Reporting.

ix

SAFETY SUMMARY - Continued

RESUSCITATION

Personnel working with or near high voltage shall be familiar with approved methods of resuscitation.

Should someone be injured and stop breathing, begin resuscitation immediately. A delay could cost the victim’s life. Resuscitation procedures shall be posted in all electrically hazardous areas.

GENERAL PRECAUTIONS

The following general precautions are to be observed at all times.

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

b. Ensure all maintenance operations comply with Navy Occupational Safety and Health (NAVOSH) Program Manual for Forces Afloat, OPNAVINST 5100.19 series.

c. Observe precautions set forth in NSTM S9086-KC-STM-010/Chapter 300 with respect to electrical equipment and circuits.

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

e. Do not wear loose clothing while working around rotating parts of machinery.

f. Ensure special precautionary measures are employed to prevent applying power to the system/equip-ment any time maintenance work is in progress.

g. Do not make any unauthorized alterations to equipment or components.

h. Before working on electrical system/equipment, deenergize and tag power source DANGER DO NOT OPERATE per the Tag-Out Users Manual (S0400-AD-URM-010/TUM) and check with volt-meter to ensure that system is not energized.

i. Consider all circuits energized until proven to be deenergized as outlined in NSTM S9086-KC- STM010/CH 300, Electric Plant - General.

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

k. Deenergize all equipment before connecting or disconnecting meters or test leads.

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

m. Before operating equipment or performing any tests or measurements, ensure area is dry of water or other liquid conductive material and that frames of all motors and starter panels are securely grounded.

n. Ensure area is well-ventilated when using cleaning compound or solvent. Avoid prolonged breathing of fumes and compound or solvent contact with skin or eyes.

x

SAFETY SUMMARY - Continued

DANGERS, WARNINGS, AND CAUTIONS

Specific dangers, warnings, and cautions applying to the system/equipment covered by this manual are summarized below. These dangers, warnings, and cautions appear elsewhere in the manual following paragraph headings and immediately preceding the text to which they apply. They are repeated here for emphasis.

Danger is used to indicate a location, equipment, or system where an imminent hazard exists, capable of producing immediate injury or death to personnel, or threatens the primary mission of the ship.

Page 1-1

Prior to working on equipment, ensure all switches and circuit breakers have been placed in the open (off) position and properly tagged out using all appli-cable shipboard tag out procedures. Ensure all remotely supplied alternate power sources are placed in the open (off) position in and properly tagged out in accor-dance with all shipboard procedures. Failure to follow proper procedures may result in, equipment damage and serious injury or death of personnel.

Pages 6-2, 6-12, 6-19, 6-27, A-6, A-11, A-14, A-22, A-24, A-27, A-30, A-33, A-35, A-42, A-81, A-84, A-92, C-5, C-11, C-13

Warning is used to indicate a location, equipment, or system where a potential hazard exists, capable of producing injury to personnel, if approved procedures are not followed.

Page 1-1

Follow the general safety notices and general precautions set forth in theSafety Summary.

Pages 6-2, 6-12, 6-20, 6-27, A-6, A-7, A-9, A-11, A-14, A-22, A-25, A-27, A-30, A-33, A-35, A-43, A-51, A-81, A-84, A-92, C-6, C-6, C-8, C-11, C-13, C-26 xi

Failure to completely isolate the pump and tag all valves out of service in accor-dance with ship procedures may result in injury to or death of personnel.

Pages 6-2, 6-12, 6-20, 6-27, A-12, A-14, A-25, A-28, A-30, A-33, A-36, A-43, A-82, A-84, C-11, C-14

The pump casing weighs approximately 110 pounds. Failure to use proper rig-ging and hoisting procedures may result in injury to or death of personnel.

Pages 6-3, 6-8, 6-13, 6-17, 6-21, 6-25

The pump seal head weighs approximately 110 pounds. Failure to use proper rigging and hoisting procedures may result in injury to or death of personnel.

Pages 6-4, 6-6, 6-14, 6-15, A-16, A-20, A-37, A-40, A-86, A-90

Pressurized air may drive particles into eyes and skin if handled improperly. To prevent injury to personnel, wear proper protective gear including goggles.

Pages 6-11, A-5, C-5

Do not wear loose clothing while working around rotating machinery.

Pages 6-29, A-7, C-6 xii

Asbestos is recognized as a major health hazard. Inhalation of fibers of this material can lead to serious impairment of health in subsequent years. The insu-lation installation on the piping may contain asbestos material. The industrial hygienist at the repair activity should be notified whenever asbestos is found in the pipe insulation. The industrial hygienist will supervise the correct removal of the asbestos insulation from the pipe.

Page 8-3

Observe all safety precautions when troubleshooting the motor. Carelessness can result in serious injury to personnel and damage to equipment. If electrical power is connected, a 440-volt potential is present to the pump electrical motor.

Extreme care must be taken when the electrical box is opened.

Pages A-9, C-9

Take precautions to prevent possible burn hazard when handling the heated bear-ing.

Pages A-13, A-26, A-29, A-32, A-34, A-83, C-12, C-15

Ensure all switches and circuit breakers are still tagged out before reconnecting the electrical wiring to the pump motor.

Pages A-14, A-22, A-27, A-30, A-32, A-35, A-42, A-45, A-84, A-92, C-13

The pumping unit weighs approximately 2,300 pounds. Failure to use appropri-ate rigging and hoisting procedures may result in injury to or death of personnel.

Pages A-15, A-36 xiii

Prior to working on equipment, ensure all switches and circuit breakers have been placed in the open (off) position and tagged as follows, using applicable shipboard tag out procedure. Ensure all remotely supplied alternate sources are also open and tagged out. One cannot assume a single power source supplies all equipment internally.

Pages A-23, C-21

Before proceeding, ensure equipment is disconnected from the 440 VAC power source, and the 440 VAC power source is tagged out.

Page A-52

The pumping unit weighs 2,530 pounds. Failure to use appropriate rigging and hoisting procedures may result in injury to or death of personnel.

Page A-85

Caution is used to indicate where a hazard exists, that could severely damage equipment, a system, or the ship, causing loss of mission capability if approved procedures are not followed.

Page 1-2

This equipment is designed and built for quiet operation. Extreme care must be taken when handling this equipment to prevent any damage which might increase operating noise levels.

Page 1-2 xiv

Never start the pump if it is not filled with water. Operating the pump in an air-locked or dry condition will damage close running internal surfaces.

Pages 2-1, 6-10, 6-19, 6-27, 6-28, A-8

The pump must not be operated with a flow rate less than 30 GPM or the pump will overheat and seize.

Page 3-2

Do not install emergency packing rings unless there is a leakage of more than 45 drops per minute. If leakage is insufficient (i.e. less than 45 drops per min.) to cool the emergency packing, damage will occur to the pumping unit.

Pages 4-1, 6-28

Safeguard loose titanium and Inconel parts. Use of other than the approved pump material (i.e. titanium or Inconel 625) may cause pump corrosion leading to catastrophic pumping unit failure and flooding.

Pages 6-2, 6-12, 6-20, 6-28

Use care when assembling or disassembling parts to prevent damage to internal surfaces having close machined tolerances.

Pages 6-3, 6-8, 6-13, 6-17, 6-21, 6-25, A-12, A-15, A-25, A-28, A-30, A-33, A-36, A-43, A-82, A-85, C-11, C-14 xv

Do not use HARSH ABRASIVE that might scratch or otherwise mar surface finishes.

Pages 6-5, 6-15, 6-21, 6-23

Do not turn wear area beyond the required dimension to establish the 125 RMS finish.

Pages 6-5, 6-22

Use of other than an Inconel 625 impeller key (8) may result in a key disinte-grating. This will allow the lock nut (5) to become free and allow the impeller to come into contact with the casing, leading to catastrophic pumping unit failure.

Do not use a key that exhibits corrosion.

Pages 6-7, 6-16, 6-23

If the mechanical seal drive pins (2.1) are not in line with the slots in the seal when the impeller is installed, the springs in the seal will be fully compressed by the pins when the impeller is tightened. This will prevent the impeller from seat-ing on the shaft sleeve, resulting in one of the following:

a. The seal may rotate and the impeller pins fall into the slots. The resulting free play between the impeller and the shaft sleeve will keep the seal from operating properly. The seal will leak and the pump will vibrate due to the loose impeller.

b. The pins may not fall into the slots, causing the seal faces to be loaded too heavily. The faces will burn up quickly.

The end result in either case is catastrophic failure of the pumping unit.

Pages 6-7, 6-16, 6-24, A-20, A-41, A-90 xvi

Do not wedge, pry, or chain fall piping into position to align flanges. Excessive/ undue stress put on pump casing will change internal clearances of pump, thus causing unsatisfactory operation or failure.

Pages 6-9, 6-18, 6-26

Galvanic isolation must be maintained between the titanium pump flanges and the system flanges to prevent corrosion.

Pages 6-9, 6-18, 6-26, 8-4

For ships with galvanic flange isolation kits installed, the suction and discharge flange fasteners should not be torqued to greater than 60 Ft-Lbs to avoid damag-ing the galvanic isolation components. Do not overtorque vent flange fasteners when using guidance from NSTM S9086-CJ-STM/CH075, Fasteners.

Pages 6-9, 6-19, 6-26, 8-4, 8-5

Primers and chlorinated cleaning solvents are not to be used with titanium. Fail-ure to adhere to this may cause damage to the titanium.

Page 6-10

To avoid equipment damage, ensure low pressure air used to dry components is clean and dry. Moisture in an air line causes rust.

Pages 6-11, A-6, C-5 xvii

Excessive or repeated skin contact with anaerobic adhesive/sealants may cause skin irritation. In case of contact with skin, remove promptly by washing. To avoid skin contact, use an applicator.

Page 6-11

Do not turn wear area beyond that dimension required to establish the 125 RMS finish.

Page 6-15

The Navy Standard Titanium Centrifugal Pump has been designed and manufac-tured to minimize mechanical and electrical vibrations and noise to the extent that the pumping unit is considered to be a precision machine. It should be handled as such. Abuse by rough handling could upset the super precision bal-ance built into this unit.

Page 8-3

In all installations and particularly new installations, use extreme care when con-necting piping to ensure no foreign matter such as dirt, chips, pipe scale, and welding beads are in the piping as this debris will be drawn into the pump and cause internal damage. Thoroughly flush the system before connecting it to the pump.

Page 8-4

To prevent galvanic corrosion, fitting failure, and flooding, titanium tubing and fittings should be used for gage and vent lines.

Page 8-5 xviii

Do not overgrease. Too much grease will cause churning of grease, which can lead to overheating of the bearings. The total grease capacity for the DE bearing is 2.75 oz, while the ODE bearing contains 3 oz. The bearing lubricant shall conform to DOD-G-24508.

Page A-8

Disassembly of AC motors should be accomplished by authorized personnel at authorized maintenance activities only. Disassembly by unauthorized personnel may result in equipment damage.

Pages A-11, A-24, A-81, C-10

Do not allow machined surfaces to contact other surfaces without protection against nicks, scratches, burrs, etc.

Pages A-17, A-38, A-87

To avoid damage to motor windings and shaft bearings, brace motor rotor securely while end brackets/shields are removed.

Pages A-17, A-38, A-44, A-87

The pumping unit is positioned on studs. The unit must be lowered straight down to protect studs and reamed holes in motor housing feet.

Pages A-21, A-41, A-91 xix

Do not use lead or zinc paints on internal parts of the motor. Use only air dry-ing insulating varnish.

Pages A-23, A-93

Do not overgrease. Too much grease will cause churning of grease, which can lead to overheating of the bearings. The bearing lubricant shall conform to DOD- G-24508.

Page C-7 xx

CHAPTER 1

GENERAL INFORMATION AND SAFETY PRECAUTIONS

1-1. INTRODUCTION.

This manual covers the description, installation, operation, scheduled maintenance, troubleshooting, correc-tive maintenance, and parts lists of the pumping unit, Navy Standard Drawing No. 803-5773203 and is appli-cable to the following ratings (Table 1-1):

Table 1-1 Pump Ratings

Rating Configuration

125 PSI 750 GPM Figure 1-2 150 PSI 750 GPM Figure 1-3 125 PSI 900 GPM Figure 1-4 125 PSI 1000 GPM Figure 1-5 150 PSI 1000 GPM Figure 1-6 175 PSI 1000 GPM Figure 1-7

1-2. SAFETY PRECAUTIONS.

The dangers, warnings, cautions, and notes appearing throughout this technical manual are important for per-sonnel and equipment safety. Prior to any attempt to operate, maintain, troubleshoot or repair any part of the motor driven Navy Standard Titanium Centrifugal Pump (hereinafter referred to as the pumping unit), all dan-gers, warnings, cautions, and notes should be thoroughly reviewed and understood. Refer to theSafety Summary, which is located in the front matter of this manual, for a complete listing of dangers, warnings, and cautions used throughout this manual.

1-2.1 Danger/Warning/Caution/Note Definitions. The following paragraphs define dangers, warnings, cau-tions, and notes as they are used in this manual.

Danger is used to indicate a location, equipment, or system where an imminent hazard exists, capable of producing immediate injury or death to personnel, or threatens the primary mission of the ship.

Warning is used to indicate a location, equipment, or system where a potential hazard exists, capable of producing injury to personnel, if approved procedures are not followed.

1-1

Caution is used to indicate where a hazard exists, that could severely damage equipment, a system, or the ship, causing loss of mission capability if approved procedures are not followed.

Note highlights an essential operating or maintenance procedure, condition, or statement.

1-2.2 Additional Warnings. Operating procedures presented in this manual are not intended to modify or replace approved operating procedures for the pumping unit.

1-3. EQUIPMENT DESCRIPTION.

The pumping unit (Figure 1-1) was designed by Worthington Pump Division of Dresser Industries, Inc. and is built in accordance with MIL-P-17639E dated 23 March 1979 as modified by contract N00024-84-C-4261. It is a horizontal, single stage, double volute centrifugal pump used to develop the required sea water pressure for the ship’s fire fighting system. The pump is close coupled to a constant speed driving motor which is secured to the ship’s foundation at the motor feet. For ships that require low noise installations, the unit is mounted on a common bedplate which in turn is mounted to the ship’s foundation by means of four resilient mounts (Figure 8-2). The pump suction and discharge flanges, and vent flange (if installed, attached to the pump casing using a titanium adapter), are secured to the ship’s suction, discharge, and vent piping manifolds, respectively. These units were designed and manufactured to minimize vibration and noise by the use of quiet operation bearings and a specially designed motor fan. Some ships may have galvanic flange isolation kits (seeFigure 8-4) installed at the pump suction, discharge, and vent (if installed) flanges by SCD-79185 (MA-670) or other means. These iso-lation kits prevent galvanic corrosion between dissimilar metals; the titanium pump flange and the monel piping flange.

This equipment is designed and built for quiet operation. Extreme care must be taken when handling this equipment to prevent any damage which might increase operating noise levels.

For performance capabilities of the pumping unit, refer to the pump test curves,Figures 1-2through1-7.

1-4. RELATIONSHIP OF COMPONENTS.

For a pictorial illustration depicting the components comprising the pumping unit, relative sizes, and rela-tionships to each other, refer toFigure 8-1.

1-2

1-5. REFERENCE DATA.

The pump characteristics are contained inTables 1-2, 1-3, and1-4.

Table 1-2 Pump Characteristics

Item Characteristics

Rating (PSI) 125 150 125 125 150 175

(GPM) 750 750 900 1000 1000 1000

Liquid Pumped Sea water Specific gravity 1.03 Liquid temperature 85 °F max Speed at capacity 3585 rpm Efficiency at capacity 70.3% 71.5% 74% 75% 75% 76% Rated input at capacity (BHP) 78 92 89 97 117 134 Max input at any condition (BHP) 95 116 101 115 134 167 Actual shutoff head (PSI) 147 170 154 161 183 207 Hydrostatic test pressure 315 PSIG NPSHR, Max (Ft) 13 13 16.5 18.5 18.5 18.5 NPSHA, Max (Ft) 55 Ft Critical speed 6533 RPM Maximum axial thrust load 31.3 lbs toward suction

Table 1-3 Principal Design Dimensions

Item Design Dimensions

Size of discharge 5-inch, MIL-F-20042; 250# Size of suction 6-inch; MIL-F-20042; 250# Size of casing vent 7/8-14 UNF; MS16142 Size of casing drain 3/4-16 UNF; MS16142 Size of seal head drain 3/4-16 UNF; MS16142 Size of seal vent 9/16-18 UNF; MS16142 Size of gage connections 9/16-18 UNF, MS16142 Running clearances (Figure 7-1):

Impeller (2) vs casing wearing ring (1.2) 0.018-0.020 inch radial Impeller (2) vs seal head wearing ring (3.2) 0.017-0.019 inch radial Impeller (2) vs seal head (3) 0.026-0.037 inch radial

Table 1-4 Equipments, Accessories, and Documents Supplied

Qty Item Name or Nomenclature Overall Dimensions (inch) Weight and Volume

1 Pumping Unit Uncrated: Uncrated:

52 5/8 long 34 1/2 wide 28 1/8 high

2,495 lbs

31.3 cu ft

Crated: Crated:

59 long 40 wide 40 high

2,700 lbs

54.6 cu ft

1-3

Table 1-4 Equipments, Accessories, and Documents Supplied - Continued

Qty Item Name or Nomenclature Overall Dimensions (inch) Weight and Volume

1 Pump 13 long 26 wide

24 5/8 high

300 lbs

4.7 cu ft

1 Motor, frame 505Z Hansome:

39 5/8 long

34 wide 28 1/8 high

2,195 lbs

21.5 cu ft

General Electric:

49 long

32 3/4 wide 23 1/2 high

2,086 lbs

21.8 cu ft

1 Motor, frame 505DZ Mawdsley’s Limited

47.60 long 32 wide 28 high

2,230 lbs

1 Baseplate (For low noise applications) 27 1/2 long 29 wide

6 3/8 high

380 lbs

3.0 cu ft

4 Resilient Mounts (For low noise applications) Type 6E900 2 S6225-W6-MMA-010, Technical Manual for Navy

Standard, Titanium Centrifugal Pump, 1000 GPM (NAVSEA Drawing No. 803-5773203)

8 1/2 x 11 x 3/4

1-4

Figure 1-1 Fire Pump - Horizontal

1-5

Figure 1-2 Performance Curve - 125 PSI, 750 GPM

1-6

Figure 1-3 Performance Curve - 150 PSI, 750 GPM

1-7

Figure 1-4 Performance Curve - 125 PSI, 900 GPM

1-8

Figure 1-5 Performance Curve - 125 PSI, 1000 GPM

1-9

Figure 1-6 Performance Curve - 150 PSI, 1000 GPM

1-10

Figure 1-7 Performance Curve - 175 PSI, 1000 GPM

1-11 / (1-12 Blank)

1-12

CHAPTER 2

OPERATION

2-1. INTRODUCTION.

Under normal conditions the firemain, sea water cooling, and flushing systems on various class ships are supplied by the motor driven Navy Standard Titanium Centrifugal Pump. When used in conjunction with ship’s Engineering Operational Sequencing System (EOSS), this chapter explains to operating personnel the operating procedures for normal conditions that may arise while operating this pump.

2-2. SAFETY PRECAUTIONS.

Before operating this equipment, personnel should read and become thoroughly familiar with theSafety Summary. Warnings, cautions, and notes are also located throughout this manual.

2-3. CONTROLS AND INDICATORS.

The controls and indicators for this equipment are not discussed in this manual.

2-4. OPERATING PROCEDURES.

There are four normal operating procedures for the pumping unit. These procedures are precheck, start-up, inspection, and shutdown.

All personnel who operate the pumping unit should become familiar with its operation including normal noises, temperatures, and gage pressure readings.

2-4.1 Pre-Operational Checks. Before starting the pumping unit, complete the following prechecks:

a. Close the discharge valve on the pump discharge line.

b. Open the suction valve on the pump suction line.

c. Ensure the recirculation (bypass valve) is locked open.

Never start the pump if it is not filled with water. Operating the pump in an air-locked or dry condition will damage close running internal surfaces.

d. Vent the pump by opening the bleed-off valve on the top of the pump casing.

e. Line up the valves to the suction and discharge pressure gages so they indicate the pressure between the pump suction and discharge valves.

2-1

2-4.2 Startup. To start the fire pump proceed as follows:

a. Rotate the shaft by hand to ensure it turns freely.

b. Open applicable system isolation valves.

c. Turn on power to the pump motor in accordance with established ship’s procedures. Jog the pump motor to ensure correct direction of pump rotation. If necessary, correct by switching any two motor leads.

d. Start the pump unit. Monitor discharge line pressure gage. As the pressure in the discharge line builds up, slowly open the discharge valve.

2-4.3 Inspection. The following inspections should be made periodically during operation of the pumping unit, and if there is a deviation from normal, the operator shall secure the pumping unit, investigate, and correct immediately in accordance withTable 5-1.

a. Listen for rubbing sounds, unusual noise, or vibration.

b. Watch for sea water leakage at casing joints or grease leakage from the bearing housings.

c. Check the temperature of each motor housing by touch. If the housing feels hot, determine its temperature with a thermometer. Place the bulb directly on the housing and protect the bulb from the surroundings with putty.

Normal operating temperature is between 100 °F and 150 °F. Maximum allowable operating temperature is 180 °F. Pump should be monitored more frequently when temperature approaches 150 °F.

d. Check the readings of the suction and discharge gages.

e. The pumping unit shall be inspected periodically for mechanical seal leakage. If the seal leakage exceeds five drops per minute, the leakage should be monitored more frequently. When the leakage rate is 45-60 drops per minute, emergency packing should be installed and the mechanical seal should be replaced as soon as practi-cal. The procedures for installing the emergency packing are given inparagraph 6-8.

2-4.4 Shutdown. To shutdown the pumping unit proceed as follows:

a. Press the STOP button.

b. Close the pump discharge valve.

c. Close the suction valve.

2-2

CHAPTER 3

FUNCTIONAL DESCRIPTION

3-1. INTRODUCTION.

This chapter provides maintenance personnel with a general functional description of the pump portion, one of the two major components that comprises the pumping unit. The pump receives its drive from the AC motor (19). The rotation of the shaft and the impeller’s radial curved vanes in the water-filled cavity generates centrifu-gal force sufficient to move the water from the suction piping to the discharge piping.

3-2. PUMP DESCRIPTION.

The principal features of the pump end portion of the pumping unit are illustrated and identified by piece numbers inFigures 6-7and7-1, and consist of the following:

3-2.1 Casing. The casing (1.1) is of the double volute type and is designed to produce a smooth flow with gradual changes in velocity. It is provided with suction and discharge nozzles cast integral. The casing is also provided with vent and drain connections. Refer toFigure 8-1for location of vent and drain connections.

3-2.2 Seal Head. The seal head (3.1) provides for positioning the mechanical seal (10) or (10A) and is designed with machined faces which register and space the casing with respect to the motor (19). The seal head is positioned by a rabbet fit on the casing and the motor mounting face.

A drain connection is provided to drain any overflow leakage from the stuffing box in case of seal failure.

The seal head is bolted to the casing by studs (1.4) and nuts (1.5) and to the motor with studs (3.6 and 3.7) and nuts (3.8).

3-2.3 Wearing Rings. Both the casing and seal head are provided with renewable wearing rings (1.2U and 3.2U) to allow for renewal of design wearing clearances. The wearing rings are shrink fitted into the casing and seal head and locked in place by #8-32 slotted set screws (1.3 and 3.3) which are located 180° apart.

3-2.4 Impeller. The impeller (2A through 2F) is of the single suction closed type keyed to the motor shaft by the impeller key (8). The impeller is locked in position against the shaft sleeve (4) by means of the impeller nut

(6) and lockwasher (5).

3-2.5 Shaft Seal. The pump is furnished with either the original multi-spring mechanical seal (10) or the new Navy Standard single-spring mechanical seal (10A). The Navy Standard seal is the preferred mechanical seal. It uses an open spring design to resist silt build up and a harder carbon ring to increase its capability of handling abrasive silt.

The mechanical seal is located in the seal head and is held in place by the mechanical seal gland (10.10).

The rotating portion of the mechanical seal is seated on the shaft sleeve. The stationary seat portion is held in place by the mechanical seal gland which also has provisions to install two rings of 3/16 inch square packing (10.14) to be used in case of mechanical seal failure. The rotating portion of the original multi-spring mechani-cal seal is driven by two pins (2.1) on the impeller hub which engage in two slots provided in the seal retainer (10.5) (Refer toFigure 6-6). The rotating portion of the Navy Standard seal is driven by the friction fit between the seal diaphragm (10A.4) and the shaft sleeve. The seal retainer (10A.5) of the Navy Standard seal has four large open slots to allow installation over existing pins (2.1). A connection is provided in the casing volute which

3-1 supplies the water to flush and lubricate the mechanical seal faces. This connection is piped with 3/8-inch OD tubing through a cyclone separator (11) and into the mechanical seal gland, thus maintaining optimum shaft seal performance. The sediments from the separator outlet are piped back to the pump suction. The mechanical seal gland is furnished with a vent connection which must be open when venting the pump.

3-3. PUMP OPERATION.

A centrifugal pump converts mechanical energy from the driver into kinetic energy of the pumped fluid. The rotating impeller induces the fluid to flow into the impeller eye, where by means of centrifugal force, the fluid is directed to the outer diameter of the impeller. As the fluid moves from the impeller eye to the outer diameter, it is greatly accelerated by means of the impeller vanes. The resulting high velocity head at the vane tips is then converted into pressure head by the design of the volute collector portion of the pump casing which directs the flow to the casing discharge flange.

3-4. PUMPING UNIT.

The pumping unit is designed to operate at any of the rated conditions listed inTable 1-2, the highest of which is 1000 GPM at a discharge pressure of 175 PSIG. The pumping unit is suitable for continuous operation at any flow rate between 30 GPM and free delivery with a NPSHA not to exceed 55 ft. at the free delivery con-dition.

The pump must not be operated with a flow rate less than 30 GPM or the pump will overheat and seize.

If at the free delivery condition 55 ft. NPSHA is exceeded, the pump will attempt to run further out along the curve and will result in the motor overloading.

It is important to note the recirculation bypass flow must not be directed into the suction side of the pump, but must be directed overboard or to the suction sea chest.

3-2

The pump is balanced for operation at the rated condition of service, therefore, operation at any other condition will have an effect on bearing vibration and noise.

Refer toFigure 8-1for the outline of the pump and motor.

3-5. FIRE PUMP AIR RELEASE VENT VALVE.

3-5.1 Fire Pump Air Release Vent Valve. Pumps that are utilized in seawater applications require vent systems fabricated with titanium materials attached to the pump casing with a galvanic isolation provision installed between the titanium materials and copper nickel or nickel copper materials used in the pump venting system.

This requirement does not apply to freshwater pump applications such as chilled water pumps. Copper nickel, bronze, or nickel copper materials will fail in two to three years due to galvanic corrosion if directly connected to the titanium pump in seawater applications.