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Ammunition Demolition Outfit Mark 108 (For Submarines), Ordnance Pamphlet 1012, 1943, describes the self destruction demolition device used to prevent the intact capture of a submarine.

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RESTRICTED
ORDNANCE PAMPHLET NO. 1012
AMMUNITION
DEMOLITION OUTFIT MARK 108
(For Submarines)
DESCRIPTION
INSTALLATION AND OPERATION
A BUREAU OF ORDNANCE PUBLICATION
JUNE 1943


RESTRICTED NAVY DEPARTMENT
BUREAU OF ORDNANCE
WASHINGTON 25, D. C.
 

To all holders of Ordnance Pamphlet 1012 insert change; write on cover 'Change 1 inserted' Approved by The Chief of The Bureau of Ordnance Hussey OP 1012  CHANGE 1
16 March 1945
2 Pages--Page 1

ORDNANCE PAMPHLET 1012
is changed as follows:
DEMOLITION OUTFIT MARK 108 (FOR SUBMARINES)
DESCRIPTION, INSTALLATION AND OPERATION

1. Delete paragraph 7(a) on page 6 as written and insert:

7(a) - If one or more torpedo warheads are to be used for demolition or scuttling purposes, and Demolition Charges Mark 2 are not available, the warhead should be selected and fitted with a cork plug, furnished as part of the outfit.

2. Delete paragraph 8 on page 6 as written and insert:

8.- When the situation requires the use of the Demolition Outfit, the following procedure shall be observed:

(a) If both torpedo warheads and Demolition Charges Mark 2 are available, place the Demolition Charges as follows:

(1) One as near as possible to the explosive charge in one of the forward torpedo warheads

(2) One as near as possible to the explosive charge in one of the after torpedo warheads

(3) One amidships

Install the blasting cap in each of the Demolition Charges Mark 2 as outlined in paragraph 19.

(b) If Demolition Charges Mark 2 are not available and torpedo warheads are available, place one blasting cap in the booster of one of the forward torpedo warheads and one blasting cap in the booster of one of the after torpedo warheads. Install the blasting caps as outlined in paragraph 7.

(c) If only Demolition Charges Mark 2 are available, place the Demolition Charges in position. one forward, one aft, and one amidships. Install the blasting caps in Demolition Charge Mark 2 as outlined in paragraph 19.

(d) The following procedure applies for use of the Demolition Outfit Mark 108 under any of the conditions described in 8(a), (b) and (c) above:

(1) Run out the single conductor cable in general accordance with the schematic wiring diagram (Figure 5), and splice blasting cap wires to the cables, making certain that the "shorting" clip is removed from the detonator wires and that the splices are well taped. If for any reason it is necessary to shorten the leg wires of the blasting cap, all enamel must be scraped from the part of the leg wires used for making the final connection.

(2) Set up the timer and battery box in its prearranged location. Check batteries by flashing the test lamp. Set the timer dial to the delay period desired. Connect the two cables from the demolition charges (or from the warhead booster cavity, if applicable) to the box terminal. Cut the retaining wires from the three plate screws, remove screws and safety plate from timer.

(3) Throw timer toggle switch to the "ON" position.

3. Add paragraphs 18 to 21, inclusive, as indicated below, under the heading of "Special Precautions to Insure Functioning":

SPECIAL PRECAUTIONS TO INSURE FUNCTIONING

18. Dry cell deterioration, particularly under unsatisfactory storage conditions, is rapid. If the ship has suitable storage batteries to furnish a source of current not more than 24 volts and not less than 12 volts, it is desirable, if circumstances permit, to utilize the source of current from the storage batteries by attaching the storage batteries in series with the dry cells.

19. To insure intimate contact between the blasting cap and the tetryl pellet of the booster, remove the booster charge, insert the blasting cap in the detonator well by puncturing the onionskin paper, replace booster charge, making sure the blasting cap is not dislodged. Run the leg wires from the blasting cap through the cover plate and stuffing nut, replace the cover plate and tighten down the stuffing nut. Connect the leg wires of the blasting cap to the blasting cable in series with the other



Change 2
 
charges. If the electric blasting cap extends more than 7/16" from the end of the booster detonator well, it is not properly placed and low order detonation is likely to occur.

20. The Demolition Charge Mark 2 shall be right side up when and after inserting the blasting cap to prevent any slight withdrawal of the blasting cap from contact with the tetryl pellet of the booster.

21. In the blasting cap assembly with a torpedo warhead (Figure 4), care shall be exercised to insure that the blasting cap is pushed far enough through the cork and the cork pushed close enough to the booster to obtain as initimate a contact with the tetryl booster of the warhead as possible.

4. Add paragraph 22, as indicated below, under the heading of "Special Notice"

SPECIAL NOTICE

22. The preferred arrangement for utilizing Demolition Outfit Mark 108 is as outlined in item 8(a) above, and alternate arrangements described herein are described to take care of any limiting conditions that may occur.

DISTRIBUTION

Requests for additional copies of OP 1012 Change I should be submitted on NAVORD FORM 1, ORDNANCE PUBLICATIONS AND FORMS REQUISITION, to the nearest Ordnance Publications Distribution Center: Navy Yard, Wash. 25, D. C.; Adak, Alaska; Mare Island, Calif.; OrdPubSubcen, NSD, Guam Island, Marianas; Pearl Harbor, T. H.; Manus Island, Admiralty Islands. Distribution Center Mailing addresses should be obtained from List 10 nn of the Standard Navy Distribution List, or from the reverse side of NAVORD FORM 1.

Standard Navy Distribution List No. 27 (C) & 30 (R)
2 copies unless otherwise noted.

1. a, f, h, k, 1;
2. c, k, u;
3. mm, oo, pp;
B3. (5 copies), LIONS, CUBS;
4. mm, oo, pp;
5. b(London only);
6. a;
7. f, h, i, j, q;
7. (5 copies), b, c, 1, p, s;
7. (10 copies), a;
8. b, h*, i, n(SPECIAL LIST K, P, X), cc;
10. f, i*, qq, ss;
10. (25 copies), nn;
11. a(CNO);
12. a, b(Revision 1);
13. hh, nn;
14. a, q

* Applicable Addressees



RESTRICTED ORDNANCE PAMPHLET NO. 1012

AMMUNITION
DEMOLITION OUTFIT MARK 108
(For Submarines)

DESCRIPTION
INSTALLATION AND OPERATION

Department of the Navy Bureau of Ordnance
JUNE 1943


This publication is RESTRICTED and will be handled in accordance with Article 76, United States Navy Regulations, 1920


UNITED STATES GOVERNMENT PRINTING OFFICE
WASHINGTON - 1944



2
 

NAVY DEPARTMENT
BUREAU OF ORDNANCE
WASHINGTON, D. C.

RESTRICTED June 1943.

ORDNANCE PAMPHLET No. 1012
DEMOLITION OUTFIT MARK 108

1. Ordnance Pamphlet No. 1012 contains information on the installation, operation, and maintenance of the Demolition Outfit Mark 108. This outfit consists of a Mark 3 timer and battery box, Mark 2 and 4 demolition charges, blasting caps, and conductor cable.

2. This publication is primarily for the use of competent ordnance personnel aboard units of the fleet. If the need is warranted, the Demolition Outfit Mark 108 may be used by demolition units ashore.

3. Ordnance Pamphlet No. 1012 is a new publication and does not supersede any existing Ordnance Pamphlet. It will become effective upon receipt.

4. This publication is Restricted and should be handled in accordance with the provisions of Article 76, U. S. Navy Regulations, 1920.

W. H. P. BLANDY
Rear Admiral, U. S. Navy,
Chief of the Bureau of Ordnance.
Ruddock Acting



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CONTENTS
DEMOLITION OUTFIT MARK 108

Subject Page
Introduction 4
Purpose 4
General description 4
Timer and battery box Mark 3 4
Batteries 4
55-pound demolition charges Mark 2 4
Blasting caps 5
Blasting cap packing box 5
Cork plugs 5
Cable 5
Preparation of outfit for installation 5
General 5
Timer and battery box 5
Blasting cap box 6
55-pound demolition charges Mark 2 6
Torpedo war head assembly 6
Preparation for action 5
General notes 5
Estimated weights 7
List of applicable drawings 7
LIST OF ILLUSTRATIONS
Title
FIGURE 1. Timer and battery box-battery end 4
FIGURE 2. Timer and battery box-timer end 4
FIGURE 3. 55-pound demolition charge Mark 2 5
FIGURE 4. Blasting cap assembly-torpedo war head 5
FIGURE 5. General wiring diagram 6

595915-44



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DEMOLITION OUTFIT MARK 108-INSTALLATION AND OPERATION
 

INTRODUCTION

1. The Purpose of the Demolition Outfit Mark 108 is to provide a means for scuttling a submarine at a predetermined time (between 15 minutes and 5 hours) subsequent to its abandonment.

GENERAL DESCRIPTION

2. The Demolition Outfit Mark 108, as issued to each vessel, consists of the following components :

(a) One timer and battery box Mark 3 consisting of a hardwood box, approximately 13.5

Figure 1.-Timer and battery box-battery end.
Figure 1.-Timer and battery box-battery end.

inches long, 6.75 inches wide and 12.125 inches high, hinged at both ends. One end, marked "Batteries," provides access to the battery compartment and contains a diagram showing the internal wiring. (See fig. 1.) The other

  end, marked "Timer," contains the operating panel, comprising the timer, toggle switch, battery-test lamp and switch, two terminals for connecting the cables leading to the demolition charges, and an instruction card. ( See fig. 2.)

(b) Eight standard 2 1/2 by 6 inch dry cells, with screw terminals, to be procured from store and installed in the timer and battery box by ship's force before commencing each patrol.

(c) Three 55-pound demolition charges Mark 2, with boosters. This charge consists of a metal case, approximately 9.25 inches square by 14.25 inches high over-all, provided with a booster

Figure 2.-Timer and battery box-timer end.
Figure 2.-Timer and battery box-timer end.

cavity, 2 inches square, and a stuffing box for passing the wires leading to the blasting cap. The booster consists of one 1/2-pound TNT-Tetryl block (demolition charge Mark 4). The 1/2-pound compressed TNT block



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(demolition charge Mark 3) may be used as a booster if the TNT-Tetryl blocks are not available. (See fig. 3.)

Figure 3.-Fifty-five pound demolition charge Mark 2
Figure 3.-Fifty-five pound demolition charge Mark 2

(d) Eight blasting caps, type B, electric. These caps are also known as the "Army Engineer Special." Each cap has two insulated wires, 12 feet long, which are "shorted" by means of a small metal clip to prevent functioning due to stray or induced currents while in storage. The clips must be removed before the caps are used.

(e) One packing or stowage box for the eight blasting caps.

(f) Three cork plugs, for securing blasting caps in the detonator cavity of loaded torpedo war heads. (See fig. 4.)

(g) Six hundred-foot single conductor, insulated cable. Furnished in three coils of 200 feet each.

PREPARATION OF OUTFIT FOR INSTALLATION

3. General.-Check all items received to insure that a complete outfit, including a set of dry cells, is on hand.

4. Timer and battery box Mark 3.

(a) Open up the timer and battery box and remove the seven battery connectors found inside, Loosen the wing nut (see fig. 1) and

  rotate the retaining bar outward and down, permitting insertion of batteries into the battery compartment. Connect the green and blue wires, at bottom of compartment, to opposite terminals of the two lowermost batteries. Connect all batteries in series, using the seven connectors furnished in the box. Test the battery installation by throwing the test switch (see fig. 2) and observing the test lamp. If the lamp lights brightly, the installation may be considered satisfactory. If light is dim, or does not light up at all, check the wiring. If this fails, test each battery by standard methods. With the safety plate on the timer, check for OPEN circuit between the two large terminals, or binding posts, at the bottom of the panel compartment. Remove safety plate and allow timer to start running. Throw the toggle switch on the timer to the "ON" position and recheck for OPEN circuits between the two terminals. Permit timer to run until it reaches "0" time and check for "CLOSED" circuit. This condition corresponds to "FIRING" the demolition charges.

(b) At the discretion of the Commanding Officer, the timer may be set to run various lengths of time and the actual time of operation checked. A "calibration card" so derived may be made up and attached to the box for future reference.

Figure 4.-Blasting cap assembly-torpedo war head.
Figure 4.-Blasting cap assembly-torpedo war head.

(c) To place the timer in the "secure" condition, throw the timer toggle switch "OFF"; set timer to any position beyond 15 minutes; replace safety plate and its three holding nuts; run small safety wire through all three nuts; remove all tools; etc.; from the compartment;



6
 
close and hook door shut. Check battery compartment for foreign matter; check all battery terminals to insure their tightness; close and hook door.

(d) Place the box in a secure and dry stowage place, where it cannot be tampered with.

5. Blasting cap packing box.

Provide a suitable and safe stowage place for the blasting cap stowage box, in accordance with existing regulations pertaining to the stowage of detonators.

6. 55-pound demolition charges Mark 2.

Open up the booster cavity of the demolition charges Mark 2 by removing the four screws surrounding the top center part. Examine cavity to insure that the 1/2-pound TNT-Tetryl (or compressed TNT) block booster is in place. Replace the cavity cover. Check the stuffing box. The charge may remain in its shipping crate if so desired. Stow the three charges in appropriate locations.

7. Torpedo war head assembly.

(a) If one or more loaded torpedo war heads are to be used for demolition or scuttling purposes, in lieu of the 55-pound demolition charges, such war heads should be selected and fitted up with the cork plugs furnished as part of the outfit.

(b) Check the cork plugs by trying one of of the blasting caps for fit through the central hole of each plug.

(c) Provide a wooden dowel of the same size as the blasting cap (0".275 diameter by 3".0 long) and assemble it in the center of the cork plug. Fit the cork plug and dowel into the detonator cavity of the war head booster as indicated in figure 4. If any war head requires different fitting of the cork plug, both the cork and the war head should be clearly marked to insure proper reassembly.

(d) Should the war head booster assembly differ materially from that shown in figure 4, any suitable means at hand may be utilized to provide a substantially similar assembly. The primary object sought is, of course, the detonation of the war head booster by the blasting cap.

 

PREPARATION FOR ACTION

8. When the situation requires the use of Demolition Outfit, the following procedure should be observed :

(a) Place the demolition charges in position, one forward, one aft, and one amidships. Open up booster cavities preparatory to installing blasting caps.

(b) Run out the single conductor cables, in general accordance with the schematic wiring diagram, figure 5. Demolition Charges (or War Heads)

Figure 5.-General wiring diagram.
Figure 5.-General wiring diagram.

(c) Install blasting cap in each demolition charge (or war head). Splice blasting cap wires to the cables, making sure that the "shorting" clip is removed from the detonator wires and that the splices are good and are well taped.

(d) Set up the timer and battery box in its predetermined location. Check batteries by flashing the test lamp. Set the timer dial to the delay period desired. Connect the two cables from the demolition charges to the box terminals. Cut the retaining wire from the three plate screws, remove screws and safety plate from timer.

(e) Throw timer toggle switch to the "ON" position.

9. The outfit is now in operating condition and will fire at the expiration of the set time interval.

GENERAL NOTES

10. Caution. Not more than three blasting caps shall be connected in series when using this outfit.



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11. The personnel to be responsible for setting up and operating the outfit shall become thoroughly familiar with the operation of the timer, the assigned location of all components, both in stowage and in action, and the method of installing and connecting the blasting caps and wiring.

12. The connecting cables, cork plugs, and specially made items, such as wedges, etc., required for fitting into war heads, should be bundled and labelled as to their purpose, and stowed away carefully, to avoid their inadvertent use for other purposes.

13. The blasting caps must be kept in the stowage box until ready for use. The timer and battery box should require no maintenance, other than keeping it in as dry and protected place as is practicable. Batteries should be exchanged for fresh ones before starting a patrol, or oftener if desired and opportunity presents, to insure that batteries will be good when needed for action.

14. The instructions and descriptive data included on the card attached to the inside of the timer compartment door should be studied carefully in conjunction with the instructions herein contained.

  15. The tactical uses of this outfit will be covered by separate instructions.

16. Estimated weights.
Pounds
Timer and battery box Mark 3 (less batteries) 14
Eight dry cells 17 31
--
Three demolition charges, Mark 2 (less shipping crate), @ 65 pounds 195
Three shipping crates, @ 16 pounds 48 243
-- --
Eight blasting caps and packing box 9
Three cork plugs 1
600-foot single conductor cable 4
--
Total weight of outfit (approximate) 288

17. List of applicable drawings.

Timer and battery box Mark 3, outline 393658
55-pound demolition charge Mark 2 328794
Packing box for demolition charge Mark 2 328819
1/2-pound demolition charge Mark 4 ( TNT-Tetryl block) 330074
1/2-pound demolition charge Mark 3 (Compressed TNT block) 281778
Blasting cap, type B, electric 393653
Packing box for 8 blasting caps 178466
Cork plug (for torpedo war head) 330119



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DISTRIBUTION

Ordnance Pamphlet No. 1012 has been given the following initial distribution:
 

Activity Number
copies
Comin Ch 2
Cin CPac 2
Cin CLant 2
ComSoWesPac (ComSeventhFleet) 2
ComSoPac (ComThirdFleet) 2
ComNav Eu 2
ComSoEasPac 2
ComSerPac 2
ComServLant 2
ComSoLant (ComFourthFleet) 2
ComSubsPac 2
ComSubsLant 2
ComWesAustrFor 2
ComSoWesPac (ComServSeventh Fleet) 2
ComEighthFleet 2
ComNorPac 2
COTCLant 2
COTCPac 2
ComTenthFleet 2
ComSubRoms 2
ComSub Divs 2
ComAlSec 2
ComServRons 2
ComServForSuborCom 2
ASW Units 2
Submarine (SS) 2
Submarine Rescue Vessels (ASR) 2
Submarine Tenders (AS) 2
LIONS 2
 
Activity Number
copies
CUBS 2
Comdts, Naval Districts 2
Navy Yards 2
NavStas 2
ComdtNOBs 2
Naval War College 2
Naval Academy 2
Post Graduate School 2
NavTraStas 2
Naval Proving Ground 2
SS and DD Bases 2
NADs 2
NavTorpStas 2
Nav Min Depots 2
ASWTraCens 2
Laboratories 2
Naval Magazines 2
Gen. Ordnance Schools 2
Ind. Schools (Ft. Schuyler only) 2
Bomb Disposal Schools 2
Submarine School 2
SupShips* 2
SecNav 1
ViceCNO 2
BuAer 2
BuShips 2
BuDocks 2
Comdt MarCorps 2
Comdt USCG 2
* Electric Boat Co., Groton, Conn.; Manitowoc Shipbuilding Co., Manitowoc, Wis.

Notification of any desired changes in the above distribution should be forwarded direct to the Bureau of Ordnance. Requests for additional copies of this Ordnance Pamphlet should be forwarded to the nearest Bureau of Ordnance Publications Distribution Center:

(1) Commandant and Superintendent, United States Naval Gun Factory, Navy Yard, Washington, D. C.

(2) Commandant, Navy Yard, Mare Island, Calif.

(3) Officer in Charge, Ordnance Publications SubCenter, Naval Supply Depot, Pearl Harbor, Hawaii.


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