(Appendix – A)

GENERAL TECHNICAL SPECIFICATION FOR MECHANICAL POINT DETONATION FUZE (FILLED)

REQUIRED FOR SHELL 130 MM HE (EX-RUSSIAN)

TO BE FIRED WITH GUN 130 MM RIFLE BORE Fd M-46.

1. General Description: The Fuze is a mechanical nose fuze to be used in 130mm High Explosive

Shell. It is a combined percussion direct action (DA) and graze action type, with delay safety

mechanism. In this fuze “safety lock mechanism” device to be provided. The fuze is to be safe in

storage, handling and operation and ensures the reliable and safe function of the ammunition in all

weather conditions.

2. Technical Specification:

a) Length of Fuze - 105.71 mm

b) External Dia of Fuze - 40.0 mm (Max) (Ref. Appendix- C1)

c) Wt. of Fuze - 415 gm to 440 gm (Filled condition)

d) Thread dimension - 36.18 X 10 TPI

e) External dimension of Fuze is enclosed drawing No. OFCh-2015/I

This fuze is to be assembled in Adapter which in turn fitted to the Shell. The profile drawing

of Adapter assembled with CE Pellet is enclosed for ready reference as per Drawing No. OFCh-

2015/ II, OFCh-2015/III, OFCh-2015/IV.

3. Operational Readiness: The fuze should not require preparation for firing after removing it from

its container (except delay mode setting).

4. Safety: The fuze should be safe for storage, handling and transportation as per MIL-STD-1316E or

STANAG 4187. It should have bore, muzzle and flight safety. Vendor should mention in details the

mechanism provided in the fuze for meeting storage, handling and operation safety.

Reliability: It must have functional reliability of at least 95% for both direct impact & delay mode.

5. Packing:

a) Suitable packing arrangements should be provided for transportation and storage without causing

any damage to fuze.

b) The fuzes should be packed in hermetically sealed condition.

c) The package marking should be legible giving details of fuze, lot No., Year of mfg, Qty.,

Compatibility Group & UN Hazard Division. Labels and lot details to be mentioned on packages.

d) Marking of fuze: Fuze should be marked with luminous paint for ease of recognition at night

under field conditions.

6. Shelf Life: The residual shelf life of the fuze should not be less than 07 years in Indian conditions &

the supplies should be of latest manufacture. The Vendor will provide technical details for storage

and transportation. Vendor will provide Specifications with regards to explosive filling with test

procedures to evaluate shelf life. Technical literature substantiating the claim that fuze and its

explosive filling would give stipulated shelf life should be made available.

7. Proof and Sentencing Criteria: The fuzes will be checked for Check Proof and Chemical analysis

to assess the serviceability.

Type of Fuze proof : Filled Proof

Size of Lot : Multiple of 10,000 nos.+ quantity required for Filled Proof & PDI tests

Proof Conditions :

(i) Static Tests: To be finalised and carried out by OEM at their premises during manufacturing

stages and at the time of PDI.

(ii) Chemical Testing: Qty. 1 sample per lot to be subjected to chemical analysis of explosive

components at CQA(ME), Khadki, Pune.

Contd..Page 2/..

:: 2 ::

(iii) Dynamic firing : Table - 1

Proof

condition

No.

of

Rds

Shell Charge Target Fuze Setting Performance

required.

(a) Absence

of premature

08

Shell 130 mm

Inert Filled with

TNT/AL Pellet

130 mm Full ch

+ increment to

realise pressure

419 to 425 Mpa

25 mm

wooden

target to

be kept at

100 to

150m.

Instantaneous

There must not be

(i) Premature

(ii) Blind

(iii) Low order

detonation

(b) Arming

proof

08

Shell 130 mm

Inert Filled with

TNT/AL Pellet

130 mm RVC,

Ch-4

25 mm

wooden

target to

be kept at

100 to

150m.

Instantaneous

There must not be

(i) Premature

(ii) Blind

(iii) Low order

detonation

(c) Percn

Proof-Set

Delay

08

Shell 130 mm

Inert Filled with

TNT/AL Pellet

130 mm RVC,

Ch-3

25 mm

wooden

target to

be kept at

100 to

150m.

Delay Cap off

There must not be

(i) Premature

(ii) Blind

(iii) Low order

detonation

(iv) Failure in

Delay distance

(which is 15 to 60m

behind the target)

Special Note: Trials are underway at Proof establishments for introduction of following proof methodologies

1. Introduction of Magnesium pellet in place of TNT/AL Pellet.

2. Use of Mild Steel plate instead of Wooden target board

(iv) Observation Required :

(a) For Proof Condition (a) & (b)

(i) Correct functioning of Rd

(ii) Complete Detonation / Low Order Detonation

(iii) Blind

(iv) Defect in barrel such as Land stripping, scoring, flattened lands and MB damaged.

(v) Any other Defects.

(b) For Proof Conditions (c)

(i) Chamber Elongation of the barrel

(ii) Correct functioning of Rd

(iii) Complete Detonation / Low Order Detonation

(iv) Blind

(v) Defect in barrel such as Land stripping, scoring, flattened lands and MB damaged.

(vi) Delay Distance

(vii) Any other Defects.

(v) Classification of Defects :

For Proof condition (a) and (b)

(i) Critical Defects :- Premature

(ii) Major Defects :- Blind, Low Order Detonation

For Proof Condition (c)

(i) Critical Defects :- Premature

(ii) Major Defects :- Blind, Low Order Detonation, failure in Delay Distance

Contd..Page 3/..

:: 3 ::

(vi) Acceptance Criteria:

For Critical Defects (Premature)

Proof

Level

Sample

Size

Cumulative

Sample

size

Acceptance Criteria

AQL Acc Rej

Each lot 08 08 0 1 --

For Major Defects (Blind & Low Order Detonation)

Proof

Level

Sample

Size

Cumulative

Sample

size

Acceptance Criteria AQL

Acc Rej

4% First proof 08 08 0 2

Reproof 08 16 1 2

For Major Defects (Failure in Delay Distance)

Proof

Level

Sample

Size

Cumulative

Sample

size

Acceptance Criteria AQL

Acc Rej

10% First proof 08 08 1 4

Reproof 08 16 4 5

8. Technical Literature

Vendor to provide User Handbook / operator manual, Technical manual, drawings, specifications,

manufacturing process schedule, gauge schedule, manufacturing tool drawings, Jig drawings,

,fixture drawings and assly/ disassembly and safety instruction for manufacturing this fuze in

India. All literature should be in English. In addition to hard copy, a soft copy i.e. CD containing

all above information should also be provided.

a) UNHD & Compatibility Group of Fuze to be specified and the same should be included by

OEM.

b) Procedure of disposal of blinds and removal of stuck up rounds to be provided.

c) Computer based full animation graphics to explain functioning of fuzes to be provided.

d) Do & Don‟t for usage.

9. Environmental Conditions :

It must adhere to MIL-STD- 331C 2005 or latest version

a) Minimum Temperature for use – 25 0C

b) Maximum Temperature for use + 50 0C

c) Minimum Temperature for storage – 50 0C

d) Maximum Temperature for storage + 70 0C

e) Minimum Relative Humidity 95 %

f) Avg Relative Humidity 65 %

g) Mean value of year‟s Temperature 32 0C

10. Special Note

The Filled Fuzes will be from current manufacture or latest vintage. The firm shall provide free Transfer

of Technology (TOT) of the fuzes quoted by firm as per para 8 at the time of supply. The depth of

Technology transfer (not less than 100%) to be indicated and should cover hardware and all explosive

compositions. List of components and chemicals with price & quantities are to be provided (quantities in

Technical offer and price in commercial offer) Offer should include 3 sets of documents in English.

(Appendix - B)

TRIAL METHODOLOGY:

1) User Trial:

The aim of the User trial will be to assess the performance of the ammunition against operational requirements of

the Indian Army. This trial will be conducted by the User as per their actual condition of the firing. (Appendix -

B2)

The required of Fuzes for shell 130mm HE for trials to be carried out by the User are as under:

(a) Plain / Desert Qty - 35

(b) HAA Qty – 25

2) Technical Trial (DGQA Trial):

This trial will be carried out to evaluate the fuze safety, functioning and adoptability with the ammunition /

weapon at designated proof range / laboratories in India. (Appendix- B1)

Vendor representative would be required to give a certificate that the fuze given for User trial and DGQA trial is

acceptable and safe for firing for both the trials. The fuzes produced for above mentioned trials will have to be

despatched to the designated port in India at their own cost. The vendor‟s representative can attend the user trial

and DGQA trial at their own expenses in India with prior intimation in writing minimum 30 days in advance.

(Appendix – B1)

DGQA TRIAL

Reference: DGQA letter No. B/85133/Fuze B429/DGQA/ARM-3 dt. 02 Nov. 2015.

Proof Conditions:

1 Static tests: To be finalized and carried out by OEM at their premises during mfg stages

and at the time of PDI.

2 Chemical testing: Qty 1 sample per lot to be subjected to chemical analysis of explosive

components at CQA (ME).

3 Dynamic Firing:

Proof

condition

No.

of

Rds

Shell Charge Target Fuze Setting Performance

required.

(a) Absence

of

premature

08 Shell 130 mm

Filled Inert with

smk pellet

130 mm Full ch

+ increment to

realize pressure

419 to 425 Mpa

25 mm

wooden

target to be

kept at 100

to 150m.

Instantaneous There must not be

(i) Premature

(ii) Blind

(iii) Low order

detonation

(b)

Arming

proof

08 Shell 130 mm

Filled Inert with

smk pellet

130 mm RVC,

Ch-4 25 mm

wooden

target to be

kept at 100

to 150m.

Instantaneous There must not be

(i) Premature

(ii) Blind

(iii) Low order

detonation

(c) Percn

Proof-Set

Delay

08 Shell 130 mm

Filled Inert with

smk pellet

130 mm RVC,

Ch-3 25 mm

wooden

target to be

kept at 100

to 150m.

Delay Cap off There must not be

(i) Premature

(ii) Blind

(iii) Low order

detonation

(iv)Failure in

Delay distance

(which is 15 to

60 m behind the

target)

4. Observation Required:

(a) For Proof Condition (a) & (b)

(i) Correct functioning of Rd

(ii) Complete Detonation / Low Order Detonation

(iii) Blind

(iv) Defect in barrel such as Land stripping, scoring, flattened lands and MB damaged.

(v) Any other Defects.

Contd…Page 2 /-

- 2 -

(b) For Proof Conditions (c)

(i) Chamber Elongation of the barrel

(ii) Correct functioning of round

(iii) Complete Detonation / Low Order Detonation

(iv) Blind

(v) Defect in barrel such as Land stripping, scoring, flattened lands and MB damaged.

(vi) Delay Distance

(vii) Any other Defects.

5. Classification of Defects

For Proof conditions (a) and (b)

(i) Critical Defects: - Premature

(ii) Major Defects: - Blind, Low Order Detonation

For Proof Condition (c)

(i) Critical Defects: - Premature

(ii) Major Defects: - Blind, Low Order Detonation, failure in Delay Distance

6. Acceptance Criteria:

For Critical Defects

Proof

Level

Sample

Size

Cumulative

Sample

size

Acceptance Criteria

AQL Acc Rej

Each lot 08 08 0 1 --

For Major Defects (Blind & Low Order Detonation)

Proof

Level

Sample

Size

Cumulative

Sample

Size

Acceptance Criteria AQL

Acc Rej

4% First proof 08 08 0 2

Reproof 08 16 1 2

For Major Defects (Failure in Delay Distance)

Proof

Level

Sample

Size

Cumulative

Sample

size

Acceptance Criteria AQL

Acc Rej

10% First proof 08 08 1 4

Reproof 08 16 4 5

(Appendix – B2)

USER TRIAL

Reference: IHQ of MOD (Army) MGO Br/DDG Proc, New Delhi letter No. 20082/Elect Fuze/MGO/DDG Proc

dtd. 26/07/2016.

EVALUATION MATRIX FOR FUZE FOR SHELL 130 MM HE AMMUNITION)

Sl.

No. Parameter

User

Trial

DGQA

Evaluation Remarks

Part-II : Operational Characteristics

1 (a)The Fuze must be capable to be fired with all

in-service shelf of 130 mm & must match the existing

range table.

√

b) The maximum range of shells (all types) when fuzed

with the fuze should not reduce by more than 4x 50%

zone at that range after catering for nonstandard

metrological conditions, wear of the gun and change

temperature from the range /firing tables maximum

ranges.

√

2 (a) The new fuze should be capable of being screw

threaded in the current shells easily.

√

(b) There should not be any gap between shell and fuze

body after assembly.

√

Fuze Setting Arrangement

3 Fuze Setter/ Fuze setting arrangement should be similar

to in-service fuze. It must have the arrangement for fuze

setting both during day and night to include.

√

(a) It should be possible to set the fuze to „Safe‟ setting √

(b) It should allow for repeated changes in fuze setting √

Safety

4 The fuze design must meet the safety requirement

objectives and design guidelines at established by

MIL-STD 1316E or STANAG 4187 (Vendor

certificate).

√

It should adhere to safety parameters as under :-

(a) Paradropability: The fuze must be safe during and

after a para drop (Vendor certificate).

√

(b) Bore and Muzzle safety: The fuze should be safe in

bore and withstand the shock of discharge Fuzes should

not arm at a distance less than 100 m from the Muzzle.

√

Contd..Page 2/..

:: 2 ::

S. No. Parameter User

Trial

DGQA

Evaluation Remarks

Part-III : Handling, Storage & Environmental conditions

5 Marking: Marking on the fuzes must be done with the

aim of identifying the type of fuze and to ensure safety

setting are readable identifiable at night.

√

6 Packing

(a) The fuzes must be packed in hermetically sealed

containers.

(b) These should be further packed in boxes or

containers for ease of transportation. The

packages marking must give out all relevant

ammunition detail including the UN hazard

Division

√

√

7 Shelf Life: Fuzes should be have a shelf life of not less

than 15 years.

√

ENVIRONMENT CONDITIONS

8 The fuzes must adhere to MIL-STD -331C (2005 /

later version)

√

PART-IV: SPECIFIC CHARACTERISTICS

PERCUSSION FUZE

9 The fuze should detonate on impact. It should cater for

two settable modes as follows.

√

(a) Direct Impact √

(b) Delay Incorporate a minimum delay of 0.04

Sec.

√ √

10 It should have functional reliability of at least 95% for

both direct impact and delay modes (Vendor Certificate)

√