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The Fleet Type Submarine Online
Submarine Trim and Drain Systems

Submarine Trim and Drain Systems manual cover
Folks,

Submarine Trim and Drain Systems, Navpers 16166, is one of a series of submarine training manuals that was completed just after WW II. The series describes the peak of WW II US submarine technology.

In this online version of the manual we have attempted to keep the flavor of the original layout while taking advantage of the Web's universal accessibility. Different browsers and fonts will cause the text to move, but the text will remain roughly where it is in the original mamanual. In addition to errors we have attempted to preserve from the original (for example, it was H.L. Hunley, not CS Huntley), this text was captured by optical character recognition. This process creates errors that are compounded while encoding for the Web. Please report any typos, or particularly annoying layout issues to info@maritime.org for correction.

Our thanks to Shelly Shelstad ( http://www.history-on-cdrom.com) for permitting us to use images he has scanned, particularly the oversized images that were meticulously pieced together. History on CD ROM sells a very nice CD version of this manual in PDF format for easy access off the web and for a printing. Thanks also to IKON Office Solutions (http://www.ikon.com) for scanning services.

Richard Pekelney
Webmaster

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NavPers 16166
Produced for ComSubLant by Standards and Curriculum Division Training, Bureau of Naval Personnel. Submarine Trim and Drain Systems
July 1945

 
  NRB-48151-7 May 45-6M.
RESTRICTED
 

This is one of a series of Submarine
Training Manuals. The series includes:
 
1. The Fleet Type Submarine NavPers 16160
2. Submarine Main Propulsion Diesels NavPers 16161
3. Submarine Electrical Installations NavPers 16162
4. Submarine Refrigerating and Air-Conditioning Systems NavPers 16163
5. Submarine Distilling Systems Navpers 16163A
6. Submarine Air Systems NavPers 16164
7. Submarine Periscope Manual NavPers 16165
8. Submarine Trim and Drain Systems NavPers 16166
9. Submarine Sonar Operator's Manual NavPers 16167
10. Submarine Underwater Log Systems NavPers 16168
11. Submarine Hydraulic Systems NavPers 16169
12. Torpedo Tubes, 21-Inch submerged, Mks 32 to 39 O.P. 1085
 
ii
PREFACE

The Submarine School, Submarine Base, New London, Connecticut and other activities of Submarines, Atlantic Fleet, have collaborated in the preparation of this manual. It is designed for use in both instruction and operations.

The text is prepared in two parts: the first three chapters cover the principles of operation and description of the trim and drain systems; detailed and specific operational instructions for each system are presented in Chapters 4 and 5. Free use has been made of sketches and flow diagrams in order to best serve the forces afloat as well as the students of the Submarine School.

It is recognized that equipment design is subject to change as new requirements are taken into account, and as recommendations from the forces afloat are acted upon. Consequently, the descriptions and discussions included must be considered as generally typical rather than final and specific in all details.

Rear Admril Styer's signature
C. W. STYER,
Rear Admiral, U. S. Navy,
Commander Submarines, Atlantic Fleet.

 
iii
CONTENTS
 
CHAPTER 1. INTRODUCTION  
  A. Basic Principles 1
  B. Trim System 1
  C. Drain System 2
CHAPTER 2. THE TRIM SYSTEM  
  A. Functions 3
  B. Trim Pump 4
  C. Manifolds 9
  D. Valves 14
CHAPTER 3. THE DRAIN SYSTEM  
  A. Functions 20
  B. Drain Pump 22
  C. Valves and Fittings 25
CHAPTER 4. TRIM OPERATIONS  
  A. Pump from Forward Trim Tank to Sea with Trim Pump 32
  B. Pump from After Trim Tank to Forward Trim Tank with Trim Pump 33
  C. Pump from Forward WRT Tank to Sea with Trim Pump 34
  D. Pump from Auxiliary Ballast Tank No. 1 to Forward Trim Tank with Trim Pump 35
  E. Pump from Safety Tank to Sea with Trim Pump 36
  F. Pump from Negative Tank to Sea with Trim Pump 37
  G. Pump from Negative Tank to Auxiliary Ballast Tank No. 2 with Trim Pump 38
  H. Pump from Sea to Hose Connection in Forward Engine Room with Drain Pump 39
  I. Pump from No. 1 to No. 2 Auxiliary Ballast Tank with Trim Pump 40
CHAPTER 5. DRAIN OPERATIONS  
  A. Pump from Forward Torpedo Room Bilges to Expansion Tank with Drain Pump 41
  B. Pump from Pump Room Bilges to Sea with Drain Pump 42
  C. Pump from Forward Torpedo Room Bilges to Sea with Drain Pump 43
  D. Pump Water from Collecting Tank to Expansion Tank with Drain Pump 44
  E. Pump Water from Collecting Tank to Expansion Tank with Trim Pump 45
  F. Pump from Poppet Valve Drain Tank to Sea with Drain Pump 46
 
iv
ILLUSTRATIONS
 
2-1. Trim pump 5
2-2 Trim pump controls 6
2-3 Priming pump 8
2-4 Trim manifold 10
2-5 Forward WRT and trim tank manifold 12
2-6 Torpedo tube drain manifold 13
2-7 Trim pump sea stop valve 15
2-8 Torpedo tube drain stop valve to WRT tank 16
2-9 Magazine flood valve and testing casting 17
2-10 Trim line hose connection 18
3-1 Drain pump 21
3-2 Drain pump controls 23
3-3 Drain line stop valve 24
3-4 Drain pump overboard discharge valve 26
3-5 Bilge strainer 27
3-6 Macomb strainer 28
3-7 Drain line sight glass 29
3-8 Pitometer log well suction line and sump 30
3-9 Trim and drain systems 31
4-1 Pump from the forward trim tank to sea with the trim Pump 32
4-2 Pump from the after trim tank to the forward trim tank with the trim pump 33
4-3 Pump from forward WRT tank to sea with the trim Pump 34
4-4 Pump from auxiliary ballast tank No. 1 to the forward trim tank with the trim pump 35
4-5 Pump from the safety tank to sea with the trim Pump 36
4-6 Pump from the negative tank to sea with the trim Pump 37
4-7 Pump from the negative tank to auxiliary ballast tank No. 2 with the trim pump 38
4-8 Pump from sea to hose connection in forward engine room with the drain pump 39
4-9 Pump from No. 1 to No. 2 auxiliary ballast tank with the trim pump 40
5-1 Pump from forward torpedo room bilges to the expansion tank with the drain pump 41
5-2 Pump from the pump room bilges to sea with the drain pump 42
5-3 Pump from the forward torpedo room bilges to sea with the drain pump 43
5-4 Pump water from the collecting tank to the expansion tank with the drain pump 44
5-5 Pump water from the collecting tank to the expansion tank with the trim pump 45
5-6 Pump from the poppet valve drain tank to sea with the drain pump 46
 
v
Submarine underway.
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