Detail Specs_MIL-DTL-901E.pdf

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AMSC N9824 AREA ENVR

DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited.

INCH-POUND

MIL-DTL-901E

20 June 2017

SUPERSEDING

MIL-S-901D(NAVY)

17 March 1989

DETAIL SPECIFICATION

SHOCK TESTS, H.I. (HIGH-IMPACT) SHIPBOARD

MACHINERY, EQUIPMENT, AND SYSTEMS,

REQUIREMENTS FOR

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CONTENTS

PARAGRAPH PAGE

1. SCOPE

1.1 Scope

1.2 Classification

1.2.1 Test categories

1.2.1.1 Standard shock test methods (see 3.1.8.1 through 3.1.8.4)

1.2.1.2 Alternate shock test vehicles/machines (see 3.1.8.5)

1.2.2 Shock grades

1.2.3 Equipment types

1.2.4 Equipment classes

1.2.5 Shock test types

1.2.6 Mounting locations

1.2.6.1 Hull mounted

1.2.6.2 Deck mounted

1.2.6.3 Shell mounted

1.2.6.4 Wetted-surface mounted

1.2.6.5 Submarine frame mounted

1.2.6.6 Submarine end closure/closure bulkhead mounted

1.2.6.7 Surface ship mast mounted

1.2.7 Mounting plane aboard ship

1.2.8 Mounting orientation aboard ship

2. APPLICABLE DOCUMENTS

2.1 General

2.2 Government documents

2.2.1 Specifications, standards, and handbooks

2.2.2 Other Government documents, drawings, and publications

2.3 Non-Government publications

2.4 Order of precedence

3. REQUIREMENTS

3.1 Shock testing requirements

3.1.1 Establishment of requirements

3.1.1.1 Limitations

3.1.1.2 Contractor development of requirements

3.1.1.3 Approval of detailed requirements

3.1.2 Selection of test category (see 1.2.1)

3.1.3 Selection of shock grade (see 1.2.2)

3.1.4 Selection of equipment type and class (see 1.2.3 and 1.2.4) ii

CONTENTS

PARAGRAPH PAGE

3.1.5 Selection of shock test type (see 1.2.5)

3.1.5.1 Type A

3.1.5.2 Type B

3.1.5.3 Type C

3.1.6 Mounting and testing requirements

3.1.6.1 Mounting and testing of test items to the standard or non-standard test fixtures

3.1.6.2 Lightweight test fixtures

3.1.6.2.1 Modifications to fixture 4C of figure 8 and fixture 11C of figure 12

3.1.6.3 Medium weight test fixtures

3.1.6.3.1 Selection of test fixtures (medium weight shock test)

3.1.6.3.2 Medium weight shock machine mounting requirements

3.1.6.4 Design and selection of test fixtures

3.1.6.5 Selection of DSF target frequencies

3.1.6.5.1 For Class II equipment and, if applicable, Class I/II and Class III equipment

3.1.6.5.1.1 On surface ships

3.1.6.5.1.2 On submarines

3.1.7 Simulation of items during shock tests

3.1.7.1 Simulation of shipboard connections

3.1.7.2 Simulation of subsidiary components

3.1.7.3 Simulation of subassemblies

3.1.8 Conduct of shock tests

3.1.8.1 Lightweight shock test

3.1.8.2 Medium weight shock test

3.1.8.2.1 Surface ship medium weight shock test

3.1.8.2.1.1 Surface ship reduced blow test schedules

3.1.8.2.2 Submarine medium weight shock test

3.1.8.3 Heavyweight shock test

3.1.8.3.1 General heavyweight shock test schedule and shot geometries

3.1.8.3.2 General heavyweight shock test schedule of deck mounted equipment with DSF

3.1.8.3.2.1 Limitations on selection of DSF target frequency

3.1.8.4 Medium weight deck simulating shock testing of Class II deck mounted equipment and, if applicable, Class I/II and Class III deck mounted equipment

3.1.8.4.1 Testing of Class II, Class I/II, and Class III equipment installed on submarine decks

3.1.8.4.2 Testing of Class II deck mounted and, if applicable, Class I/II and Class III deck mounted equipment on surface ships and carriers

3.1.8.4.2.1 Testing of Class II, Class I/II, and Class III deck mounted equipment on surface ships except iii

CONTENTS

PARAGRAPH PAGE

carriers

3.1.8.4.2.2 Testing of Class II, Class I/II, and Class III deck mounted equipment on carriers

3.1.8.5 Testing of any items, including wetted surface mounted items, on the FSP or alternate shock test vehicles/machines

3.1.8.5.1 Requirements for acceptable use of the DSF on the heavyweight shock test

3.1.8.5.1.1 Location of equipment under test on DSF

3.1.8.5.1.2 DSF damping

3.1.8.5.1.3 DSF mass to equipment mass ratios

3.1.8.5.1.4 FSP and DSF ballast

3.1.8.6 Operation of equipment during shock tests

3.1.8.7 Monitoring of items during tests

3.1.8.8 Fastener tightening during shock tests

3.1.8.9 Balancing method for medium weight shock test assembly

3.1.9 Pre and post-shock test functional testing and inspection

3.1.9.1 Functional testing

3.1.9.2 Inspection

3.1.10 Shock test acceptance criteria

3.1.10.1 Grade A items

3.1.10.2 Grade B items

3.1.10.2.1 Supplemental acceptance criteria for Grade B items

3.1.11 Resolution of shock test failures

3.1.11.1 Lightweight

3.1.11.2 Medium weight

3.1.11.3 Heavyweight

3.1.11.4 Medium weight deck simulating shock testing

3.1.11.5 Retest requirements

3.1.11.5.1 Corrective design modifications for subsidiary components or subassemblies of the tested item.

3.1.11.5.2 Modifications during test

3.1.11.5.2.1 Incorrect or incomplete item assembly

3.1.11.6 Minor corrective design modifications

3.1.11.7 Alternate shock test vehicle/machine test failures

3.1.11.8 Design modifications

3.1.12 Shock test reporting

3.1.13 Acceptance of shock tested items

3.1.14 Disposition of shock tested items

iv

CONTENTS

PARAGRAPH PAGE

3.1.15 Use of Government-owned shock test facilities

3.2 Extension of previous shock test approvals

3.2.1 General

3.2.2 Shock test extension requests

3.2.2.1 Acceptance of shock test extension requests

3.3 Equipment and drawing marking

3.3.1 Drawings

3.3.1.1 For items approved on the basis of shock testing

3.3.1.2 For items approved by extension of previous shock test approvals

3.3.1.3 Limitations

3.3.1.4 Shock, noise, or vibration isolation devices

3.3.1.5 Exclusions

3.4 Marking of equipment requiring shock, noise, or vibration isolation devices

4. VERIFICATION

4.1 Shock test facilities

4.2 Number of items requiring tests

5. PACKAGING

6. NOTES

6.1 Intended use

6.2 Acquisition requirements

6.2.1 Specification of shock test requirements in acquisition documents

6.2.2 Supplemental ordering data

6.2.3 Associated Data Item Descriptions (DIDs)

6.3 Distribution of deliverable data

6.4 General information

6.5 Items requiring approval by the Technical Authority

6.6 Definitions

6.6.1 Ballast

6.6.2 Certification

6.6.3 Contracting activity

6.6.4 Contractor

6.6.5 Deck simulating fixture (DSF)

6.6.6 Designated Government representative

6.6.7 DSF quarter points

6.6.8 DSF target frequency

6.6.9 Equipment

6.6.10 Evaluation of hazards

v

CONTENTS

PARAGRAPH PAGE

6.6.11 Flexible element

6.6.12 Floating shock platform (FSP)

6.6.13 Foundation/sway braces

6.6.14 FSP/DSSM payload

6.6.15 Haunched frames

6.6.16 Hazard

6.6.17 Identical item

6.6.18 Inclination angle

6.6.19 Isolation devices

6.6.20 Item

6.6.21 Limited displacement capability isolation devices

6.6.22 Mass

6.6.23 Mounting configuration

6.6.24 Multi-directional equipment

6.6.25 Noise and vibration mount

6.6.26 Operating conditions

6.6.27 Principal units

6.6.28 Reviewer signature

6.6.29 Side-to-side center plane

6.6.30 Ship structure

6.6.31 Shipboard response frequency

6.6.31.1 Ship deck frequency

6.6.31.2 Submarine response frequency

6.6.32 Shock excursion envelope

6.6.33 Shock mount

6.6.34 Shock response frequency (SRF)

6.6.35 Subassemblies

6.6.36 Submarine conventional deck

6.6.37 Submarine shock isolated deck

6.6.38 Submarine shock mitigated deck

6.6.39 Subsidiary components

6.6.40 Surface ship decks

6.6.41 System

6.6.42 Technical Authority

6.6.43 Test orientation

6.6.44 Witness

6.7 Contractual and administrative provisions considered essential for acquisition vi

CONTENTS

PARAGRAPH PAGE

6.7.1 Responsibility for inspection

6.7.1.1 Responsibility for compliance

6.7.2 Shock test witness and report certification requirements (see 6.6.2 and 6.6.44)

6.8 Subject term (key word) listing

6.9 Changes from previous issue

Appendix A EXAMPLE OF SHOCK RESPONSE FREQUENCY (SRF) CALCULATION

A.1 SCOPE

A.1.1 Scope

A.2 GUIDANCE

A.2.1 Mounts

A.2.2 Load-deflection curves

A.2.3 Definitions

A.2.4 Shock response frequency (SRF)

A.2.4.1 Procedure for mounts characterized by a single load-deflection curve (identified as curve A only). .. 126

A.2.4.2 Procedure for mounts characterized by separate load-deflection curves for the compression loading and extension loading directions (identified as curve A and curve B)

A.2.5 Sample method of calculation for nonlinear hardening mounts (e.g., typical Navy standard resilient mounts)

A.2.5.1 Example 1: 11M25 mount with load-deflection curve from the Navy Standard Resilient Mount

Handbook

A.2.5.2 Example 2: 11M25 mount with an auxiliary snubber having a clearance of 0.125 inch

A.2.5.3 Example 3: 6E2000 Mount with separate load-deflection curves for the compression loading and extension loading directions from the Navy Standard Resilient Mount Handbook vii

LIST OF FIGURES

FIGURE PAGE

FIGURE 1. Lightweight shock machine (LWSM) for testing lightweight equipment FIGURE 2. Medium weight shock machine (MWSM) for testing medium weight equipment FIGURE 3. Standard heavyweight floating shock platform (standard FSP) FIGURE 3a. Heavyweight extended floating shock platform (EFSP) FIGURE 3b. Heavyweight intermediate floating shock platform (IFSP) FIGURE 4. Heavyweight large floating shock platform (LFSP) FIGURE 5. Standard FSP – maximum permissible height of vertical CG for tested items; maximum working area –

14 feet by 26 feet FIGURE 5a. EFSP – maximum permissible height of vertical CG for tested items FIGURE 5b. IFSP – maximum permissible height of vertical CG for tested items FIGURE 6. LFSP – maximum permissible height of vertical CG for tested items FIGURE 7. Fixture 4A standard mounting for back mounted equipment (type “A” test LWSM) FIGURE 8. Fixture 4C standard mounting for base mounted equipment (type “A” test LWSM) FIGURE 9. Fixture 6D-1 standard mounting for electrical switchboard meters and other panel mounted equipment

(type “C” test LWSM) FIGURE 10. Fixture 6D-2 standard mounting for electrical indicating switchboard meters and other panel mounted equipment (type “C” test LWSM) FIGURE 11. Fixture 6E standard mounting for controller components (contactors, relays, resistors, etc.) (type “C” test LWSM) FIGURE 12. Fixture 11-C standard mounting for base mounted equipment (LWSM) FIGURE 13. Standard mounting platform for testing equipment on the MWSM FIGURE 14. Section details of standard mounting platform for testing equipment on the MWSM FIGURE 15. Standard mounting platform for testing back mounted equipment on the MWSM FIGURE 16. 30-degree mounting fixture for testing base mounted equipment on the MWSM FIGURE 17. Alternate 30-degree mounting fixture for testing base mounted equipment on the MWSM FIGURE 18. 30-degree mounting fixture for testing back mounted equipment on the MWSM FIGURE 18a. 90-degree test fixture assembly FIGURE 19. Shock qualification acceptance form FIGURE 20. Examples of equipment classes FIGURE 21. Examples of testing requirements for classes of equipment FIGURE 22. Flowcharts of testing requirements for qualification of equipment by shock testing FIGURE 23. Deck simulating shock machine (DSSM) FIGURE 24. DSSM tray, spring, and spring number configuration selection – configuration 1 FIGURE 25. DSSM tray, spring, and spring number configuration selection – configuration 2 FIGURE 26. DSSM tray, spring, and spring number configuration selection – configuration 3 FIGURE 27. Equipment mounting plane FIGURE 28. Representative examples depicting three unrestricted equipment mounting orientations FIGURE 29. Representative examples depicting two vertical axis specified equipment mounting orientations FIGURE 30. Representative example of restricted equipment mounting orientation FIGURE 31. Deck simulating fixture (DSF) quarter point location FIGURE 32. Shot geometry for standard FSP FIGURE A-1. Curve A, assumed bi-linear mount load-deflection (F-X) relationship FIGURE A-2. Curve B, assumed bi-linear mount load-deflection (F-X) relationship FIGURE A-3. 11M25 mount – SRF as a function of the break point, c FIGURE A-4. 11M25 mount w/snubber (clearance 0.125”) – SRF as a function of the break point, cA FIGURE A-5. 6E2000 mount – SRF as a function of the break points, cA and cB viii

LIST OF TABLES

TABLE PAGE

TABLE I. LWSM test schedule 1 TABLE II. LWSM test schedule 2 TABLE III. LWSM test schedule 3 TABLE IV. LWSM test schedule 4 TABLE V. Test schedule for medium weight shock machine TABLE VI. MWSM test schedule 1 TABLE VII. MWSM test schedule 2 TABLE VIII. MWSM test schedule 3 TABLE IX. Surface ship MWSM test inclination and operating condition with reduced number of blows: vertical axis specified orientation shock qualification TABLE X. Surface ship MWSM test inclination and operating condition with reduced number of blows: restricted orientation shock qualification TABLE XI. Medium weight shock test inclination schedule for submarine equipment with hull, frame, and conventional deck mounting locations TABLE XII. Medium weight shock test inclinations schedule for submarine equipment with mitigated deck mounting locations TABLE XIII. Test schedule for heavyweight shock testing TABLE XIV. Test schedule for heavyweight shock testing of deck mounted equipment with DSF TABLE XV. DSSM test schedule of class II, class I/II, and class III equipment installed on submarine decks TABLE XVI. DSSM test schedule for class II, class I/II, and class III deck mounted equipment on surface ships except carriers TABLE XVII. DSSM test schedule of class II, class I/II, and class III deck mounted equipment on carriers TABLE XVIII. Mounting limitations for shock test extension TABLE A-I. Initial velocity for SRF calculation

This specification is approved for use by all Departments and Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This specification covers high-impact (H.I.) shock testing requirements for machinery, equipment, systems, and structures aboard surface ships, including carriers unless otherwise noted, and submarines, herein referred to collectively as “ships”. The purpose of these requirements is to verify the ability of shipboard installations to withstand shock loadings due to the effects of nuclear or conventional weapons or environmental mechanical shock during operation.

1.2 Classification.

1.2.1 Test categories. Tests are classified in accordance with one of the following test categories, as specified

(see 3.1.2, 6.2.1, and 6.2.2):

1.2.1.1 Standard shock test methods (see 3.1.8.1 through 3.1.8.4).

Lightweight. The lightweight shock test is a test performed on the lightweight shock machine (LWSM) (see figure 1).

Medium weight. The medium weight shock test is a test performed on the medium weight shock machine

(MWSM) (see figure 2).

Heavyweight. The heavyweight shock test is a test performed on a Standard Floating Shock Platform (FSP), Extended Floating Shock Platform (EFSP), Intermediate Floating Shock Platform (IFSP), or Large Floating Shock

Platform (LFSP) (see 3.1.2.c and figures 3, 3a, 3b, and 4).

Medium weight deck simulating. The medium weight deck simulating shock test is a test performed on Class

II deck mounted equipment and, if applicable, Class I/II and Class III deck mounted equipment on the Deck

Simulating Shock Machine (DSSM) (see figure 23).

1.2.1.2 Alternate shock test vehicles/machines (see 3.1.8.5). All equipment categorized as requiring lightweight, medium weight, heavyweight, or medium weight deck simulating shock testing can, at the discretion of the Technical Authority, be tested on the Submarine Shock Test Vehicle (SSTV), Full Scale Section (FSS), A/B-1, or by other means approved by the Technical Authority (see 6.5). In some cases, the Paddle Wheel Test Vehicle

(PWTV), simple drop testing, or other machines that can be used to test mast mounted equipment, subsidiary components, etc., may be used with approval by the Technical Authority.

1.2.2 Shock grades. Items to be tested are classified in accordance with one of the following grades, as specified (see 3.1.3 and 6.2.1):

Grade A. Grade A items are items that are essential to the safety and continued combat capability of the ship.

Grade B. Grade B items are items whose operation is not essential to the safety and combat capability of the ship, but which could become a hazard to personnel operating or manning Grade A equipment including personnel at battle stations, to Grade A items, or to the ship as a whole, as a result of exposure to shock.

1.2.3 Equipment types. Items to be tested are classified in accordance with one of the following types, as specified (see 3.1.4 and 6.2.1):

Principal unit

Subsidiary component

Subassembly

Note that the definitions of principal unit (see 6.6.27), subsidiary component (see 6.6.39), and subassembly

(6.6.35) may be different than other common usages.

1.2.4 Equipment classes. Items to be tested are classified in accordance with one of the following classes, as specified (see 3.1.4 and 6.2.1):

Class I. Class I equipment is required to meet these shock requirements without the use of isolation devices

(e.g., shock, noise, or vibration mounts, or flexible elements) installed between the equipment and the ship structure or shipboard foundation. (For clarification on submarines only, equipment mounted on a submarine conventional deck [see 6.6.36] or submarine shock mitigated deck [see 6.6.38] without isolation devices between the equipment and the deck is still considered Class I, or Class I/II [as defined below], vice Class II equipment). Examples are on figure 20.

Class II. Class II equipment is required to meet these shock requirements with the use of isolation devices

(e.g., shock, noise, or vibration mounts, or flexible elements) installed between the equipment and the ship structure or shipboard foundation. Examples are on figure 20.

Class I/II. Class I/II equipment is equipment that has some part or parts that are required to meet these shock requirements without the use of isolation devices (e.g., shock, noise, or vibration mounts, or flexible elements) and some other part or parts that are required to meet these shock requirements with the use of isolation devices installed between the part(s) and ship structure or shipboard foundation. Examples are on figure 20.

Class III. Class III equipment has shipboard application both with and without the use of isolation devices

(e.g., shock, noise, or vibration mounts, or flexible elements) installed between the equipment and the ship structure or shipboard foundation, and is therefore required to meet these requirements with and without the use of isolation devices.

1.2.5 Shock test types. Tests are classified in accordance with one of the following types, as specified

(see 3.1.5 and 6.2.1):

Type A. A Type A test is a test of a principal unit.

Type B. A Type B test is a test of a subsidiary component.

Type C. A Type C test is a test of a subassembly.

1.2.6 Mounting locations. Items are classified in accordance with one of the following mounting locations aboard ship, as specified (see 6.2.1):

1.2.6.1 Hull mounted. Hull mounted items are those mounted on:

a. For surface ships, excluding carriers. The main structural members of the ship that have a direct load path to the wetted hull, including structural bulkheads and structural bulkhead stiffeners below the main deck, and shell plating above the waterline.

b. For carriers. The basic hull structure, including frames, structural bulkheads below the waterline (or limiting draft, as defined by the ship specification), and shell plating above the waterline.

c. For submarines. The main structural members of the ship including structural bulkheads including stiffeners, hard tanks, the haunched portion of typical frames, and deep frames, but excluding typical hull frames.

1.2.6.2 Deck mounted. Deck mounted items are those mounted on:

a. For surface ships, excluding carriers. The main deck and above, and decks, platforms, and non-structural bulkheads below the main deck, or on structural bulkheads that do not have a direct load path to the wetted hull (see 6.6.40).

b. For carriers. Decks, structural bulkheads that are above the waterline (or limiting draft, as defined by the ship specification), or non-structural bulkheads.

c. For submarines.

(1) Conventional deck mounted. A conventional deck (see 6.6.36).

(2) Mitigated deck mounted. A shock mitigated deck (see 6.6.38).

(3) Isolated deck mounted. A shock isolated deck (see 6.6.37). (Testing and extension requirements are not covered by this specification.)

1.2.6.3 Shell mounted. Shell mounted items are those mounted on:

a. For surface ships. The shell plating and longitudinal stringers below the waterline.

b. For submarines. The shell plating. (This specification does not cover underwater explosion testing of items that penetrate the submarine pressure hull [see 3.1.1.1].)

1.2.6.4 Wetted-surface mounted. Wetted-surface mounted items are those located such that the item is fluid immersed and mounted:

a. For surface ships. Below the waterline and (1) external to the hull or (2) internal within normally filled hull integral tankage.

b. For submarines. External to a pressure hull boundary or internal within a normally filled hull integral tankage.

Except that, for all ships, where the item is (1) arranged in a location not subject to explosion-induced water flow, such as ballast tanks or fairwaters, or whose compactness makes it insensitive to flow effects; (2) has no buoyant or pressure sensitive components; and (3) where specifically exempted by the Technical Authority, then the item is considered not vulnerable to wetted surface effects and is classified and qualified as appropriate to its mounting location.

1.2.6.5 Submarine frame mounted. Frame mounted items are those mounted directly on submarine hull frames, excluding frames identified as submarine hull mounted item locations (see 1.2.6.1.c.).

1.2.6.6 Submarine end closure/closure bulkhead mounted. End closure/closure bulkhead mounted items are those mounted directly on submarine pressure hull closure bulkheads, but in areas not backed by pressure hull frames or external framing.

1.2.6.7 Surface ship mast mounted. Mast mounted items are those mounted on the surface ship’s masts, yard-arms, or other flexible structure above deck.

1.2.7 Mounting plane aboard ship. Items are classified in accordance with one of the following planes of mounting aboard ship, as specified (see 6.2.1 and figure 27):

Base (Bottom)

Front or face

Back

Top

Combination (such as base and back)

Other

1.2.8 Mounting orientation aboard ship. Items are classified in accordance with one of the following installed orientations aboard ship, as specified (see 6.2.1 and figures 28 through 30):

a. Unrestricted. The item is installed aboard ship in any orientation with respect to the vertical, fore-aft, and athwartship axes of the ship without limitation.

b. Vertical axis specified. The item is installed aboard ship in a particular orientation with respect to the vertical axis of the ship, but without regard to the fore-aft or athwartship axes of the ship.

c. Restricted. The item is installed aboard ship in a particular orientation with respect to the vertical, fore-aft, and athwartship axes of the ship.

Mounting orientation restrictions or limitations that are applicable to the item’s installation should be recorded on block 23, “Remarks/Approval Limitations”, of figure 19.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

DEFENSE SPECIFICATIONS

MIL-DTL-1222 - Studs, Bolts, Screws and Nuts for Applications Where a High Degree of

Reliability is Required; General Specification for

MIL-DTL-15024 - Plates, Tags and Bands for Identification of Equipment

MIL-P-15024/5 - Plate, Identification

MIL-W-21157 - Weldment, Steel, Carbon and Low Alloy (Yield Strength 30,000 – 60,000

PSI)

MIL-DTL-22200/1 - Electrodes, Welding, Mineral Covered, Iron-Powder, Low-Hydrogen, Medium and High Tensile Steel, As Welded or Stress-Relieved Weld

Application

FEDERAL STANDARDS

FED-STD-H28 - Screw-Thread Standards for Federal Services

DEFENSE STANDARDS

MIL-STD-22 - Welded Joint Design

MIL-STD-798 - Nondestructive Testing, Welding, Quality Control, Material Control and

Identification and HI-Shock Test Requirements for Piping System

Components for Naval Shipboard Use

MIL-STD-1689 - Fabrication, Welding, and Inspection of Ships Structure

MIL-STD-31000 - Technical Data Packages

(Copies of these documents are available online at http://quicksearch.dla.mil/.)

2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

NAVAL SEA SYSTEMS COMMAND (NAVSEA) DRAWINGS

BUSHIPS 10-T-2145-L - HI Shock Testing Machine, Lightweight

BUSHIPS 645-1973904 - Floating Shock Platform, General Arrangement and Details

BUSHIPS N0807-655947 - HI Shock Testing Machine, Medium Weight

NAVSEA 072-6938024 - Ninety Degree Mounting Fixture for Testing Equipment on the

Medium Weight Shock Test Machine

Source: http://assist.dla.mil -- Downloaded: 2020-02-03T12:37Z http://quicksearch.dla.mil/

H-81898-SF-645-H-1644 - Large Floating Shock Platform (San Francisco Bay Naval Shipyard

Drawing)

(Copies of these documents are available from the applicable repositories listed in S0005-AE-PRO-010/EDM, which can be obtained online at https://nll.ahf.nmci.navy.mil, may be requested by phone at 215-697-2626, or may be requested by email at nllhelpdesk@navy.mil. Copies of these documents may also be obtained from the Naval

Ships Engineering Drawing Repository (NSEDR) online at https://199.208.213.105/webjedmics/index.jsp. To request an NSEDR account for drawing access, send an email to

NNSY_JEDMICS_NSEDR_HELP_DESK@navy.mil.)

NAVAL SEA SYSTEMS COMMAND (NAVSEA) PUBLICATIONS

S9074-AR-GIB-010/278 - Requirements for Fabrication, Welding and Inspection, and Casting

Inspection and Repair for Machinery, Piping, and Pressure Vessels

(Copies of this document are available online at https://nll.ahf.nmci.navy.mil, may be requested by phone at

215-697-2626, or may be requested by email at nllhelpdesk@navy.mil. This publication can be located by searching the Navy Publications Index for the Technical Manual Identification Number (TMIN) without the suffix.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

ASME

ASME B46.1 - Surface Texture (Surface Roughness, Waviness and Lay)

ASME Y14.5 - Dimensioning and Tolerancing

ASME Y14.6 - Screw Thread Representation

(Copies of these documents are available online at www.asme.org.)

AMERICAN WELDING SOCIETY (AWS)

AWS A2.4 - Standard Symbols for Welding, and Nondestructive Testing, Including Brazing and Nondestructive Examination

AWS A3.0 - Standard Welding Terms and Definitions, Including Terms for Brazing, Soldering, Thermal Spraying, and Thermal Cutting

(Copies of these documents are available online at www.aws.org.)

HUNTINGTON INGALLS INDUSTRIES, NEWPORT NEWS SHIPBUILDING

DSSM 2010-100 - Deck Simulating Shock Machine Generation II Assembly

DSSM 2010-102 - 25Hz Spring Tray Assembly

DSSM 2010-103 - 8-14Hz Spring Tray Assembly

(Copies of these documents are available from COMNAVSEASYSCOM, 1333 Isaac Hull Avenue SE, Washington

Navy Yard, DC 20376.)

HI-TEST LABORATORIES DRAWINGS

HT-IFSP-1 - Intermediate Floating Shock Platform (IFSP)

HT-OH-39 - Paddle Wheel Test Vehicle (PWTV)

(Copies of these documents are available from COMNAVSEASYSCOM, 1333 Isaac Hull Avenue SE, Washington

Navy Yard, DC 20376.)

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2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Shock testing requirements. Shock testing requirements shall be met either by shock testing (see 3.1.1 through 3.1.15) or by extension of previously approved shock tests (see 3.2). Shock machines and FSPs shall comply with the appropriate Government drawings, unless otherwise approved by the Technical Authority.

3.1.1 Establishment of requirements. Requirements contained herein are intended to establish general shock test criteria, and to provide a basis for selection by the contracting activity or contractor of detailed shock test requirements (see 6.2.2), which must be tailored to suit the design, function, and application of the specific item to be tested.

3.1.1.1 Limitations. This specification is very general so as to cover the entire field of shipboard machinery, equipment, and systems. This specification does not cover all the detailed requirements for shock testing of any specific item. In order to apply this specification properly and avoid post-test disagreements, all features enumerated herein shall be specified, described, or defined as specified (see 6.2.1). Testing of items located on submarine shock isolated decks, testing of submarine pressure hull penetrations (see 1.2.6), and testing of wetted surface components to hull integrity levels, are not covered by this specification.

3.1.1.2 Contractor development of requirements. Where required data listed in 6.2.1 is not specified in the acquisition documents, the contractor shall develop the required information on the basis of this specification and on the basis of the contractor’s knowledge of the design, function, and intended application of the item requiring tests. In cases where information required by the contractor to permit development of detailed testing requirements is not available to the contractor, such information shall be requested from the contracting activity or Technical

Authority. Contractor-developed ordering data requires approval by the Technical Authority (see 6.2.2.b, 6.5.c, and

6.5.d).

3.1.1.3 Approval of detailed requirements. For heavyweight and alternate vehicle/machine shock tests, detailed test procedures and other ordering data listed in 6.2, which are independently developed by the contractor, shall require Technical Authority approval prior to installing the item for shock tests (see 6.5.c). Test fixture drawings shall be as specified (see 6.2.3) and justification shall be provided as to why the test fixture satisfactorily meets the requirements of this document (see 6.2.3). Acquisition documents may require that detailed test procedures and other information required by 6.2.1, which are independently developed by the contractor for lightweight, medium weight, and medium weight deck simulating shock tests, also be approved by the Technical

Authority prior to installing the item for shock tests (see 6.5.d). Absence of specified requirements for prior approval of such information does not prohibit the contractor from submitting such information for approval prior to testing.

3.1.2 Selection of test category (see 1.2.1). Unless otherwise specified (see 1.2.6, 6.2.2, and 6.5), for surface ships, shell mounted and wetted surface mounted items shall be subject to heavyweight shock testing. Unless otherwise specified (see 1.2.6, 6.2.2, and 6.5), for submarines, shell mounted items and wetted surface mounted items shall be subject to heavyweight or alternate vehicle shock testing. Other items shall be proven acceptable by either lightweight, medium weight, heavyweight, medium weight deck simulating, or alternate vehicle/machine shock testing, provided that the following limitations are complied with:

a. Lightweight shock test. The total weight supported by the lightweight shock machine anvil plate

(excluding the weight of anvil plate itself but including all structure and equipment added to the anvil plate) shall not exceed, for surface ship items and submarine shock mitigated deck mounted items, 550 pounds, and for submarine conventional deck, hull, and frame mounted items, 300 pounds. Practical size limitations shall not be exceeded. Equipment that would normally be tested on the lightweight shock machine, but is mounted on or incorporates isolation devices (e.g., shock, noise, or vibration mounts; or flexible elements) that have a deflection capability under shock loading of 1½ inches or more in any direction, shall instead be subject to medium weight, medium weight deck simulating, heavyweight, or alternate vehicle/machine shock testing.

b. Medium weight shock test. For surface ship items and submarine shock mitigated deck mounted items, the total weight supported by the medium weight shock machine anvil table shall not exceed 7,400 pounds. For submarine conventional deck mounted and hull mounted items, the total weight (item and test fixture) supported by the medium weight shock machine anvil table shall not exceed 6,000 pounds and the item weight supported by the anvil table shall not exceed 4,500 pounds (except as noted below). When the standard 90-degree fixture

(figure 18a), or a previously approved non-standard 90-degree fixture, is used for testing submarine conventional deck mounted and hull mounted items, the maximum allowable total weight supported by the medium weight shock machine anvil table shall not exceed 7,400 pounds and the item weight supported by the anvil table shall not exceed

4,500 pounds. For submarine frame mounted items, the total weight supported by the medium weight shock machine anvil table shall not exceed 3,400 pounds (except as noted below). When the standard 90-degree fixture

(figure 18a), or a previously approved non-standard 90-degree fixture, is used for testing submarine frame mounted items, the maximum allowable total weight supported by the medium weight shock machine anvil table shall not exceed 5,000 pounds and the item weight supported by the anvil table shall not exceed 3,400 pounds. The use of previously approved non-standard 90-degree fixtures shall comply with the requirements of 3.1.6.4. Practical size limitations shall not be exceeded. Equipment that would normally be tested on the medium weight shock machine, but is mounted on or incorporates isolation devices (e.g., shock, noise, or vibration mounts, or flexible elements) that have a deflection capability under shock loading of 3 inches or more in any direction, shall instead be subject to medium weight deck simulating, heavyweight, or alternate vehicle/machine shock testing.

c. Heavyweight shock test. Weight, size, and center of gravity (CG) limitations applicable to Standard FSP

(see figure 3) testing are shown on figure 5. Weight, size, and CG limitations for the utilization of the EFSP

(see figure 3a), IFSP (see figure 3b), or LFSP (see figure 4) shall be in accordance with figures 5a, 5b, and 6, respectively. The approved payload weight limits for the FSPs are as follows:

(1) Standard FSP: 2,500 lbs * (L – 4); where L = barge length in ft

For example, the standard 28-ft FSP has a 60,000-lb limit.

(2) EFSP: 100,000 lbs.

(3) IFSP: 250,000 lbs.

(4) LFSP: 400,000 lbs.

NOTE: It may be acceptable to exceed these approved payload weight limits on a case basis subject to

Technical Authority review and approval.

FSP deck simulating fixture (DSF) mass ratios may limit the maximum tested equipment weight. Mass added to satisfy the FSP DSF mass ratio requirements of 3.1.8.5.1.3 shall be included in the payload capacity calculations of heavyweight shock test procedures that include the use of the DSF.

d. Medium weight deck simulating shock test. This test is performed on Class II deck mounted equipment and, if applicable, Class I/II and Class III deck mounted equipment, subject to satisfying all criteria for use of the

DSSM in 3.1.8.4. The shock excursion envelope of Class II deck mounted equipment and, if applicable, Class I/II and Class III deck mounted equipment (6.6.32) shall not interfere with the DSSM cage structure (see figure 23), which has an interior dimension of 56 inches by 56 inches by 88 inches, or the conduct of the test. The payload weight limit shall be as specified on figures 24 through 26 for the testing of all Class II isolated payloads with weights up to 1,000 pounds and some Class II isolated payloads with weights up to 4,000 pounds. Applicability for weights between 1,000 and 4,000 pounds is dependent on ship type as well as equipment, fixture, and additional weight. Greater weights may be used subject to review and approval by the Technical Authority.

e. Alternate shock test vehicles/machines. Use of alternate shock test vehicles/machines may be required when specified (see 6.2.2).

(1) Shell mounted items. The PWTV may be utilized as an alternate shock test vehicle as approved by the

Technical Authority. When shock testing on the PWTV, shell mounted items shall be attached to the PWTV target plate using the same attachment method as specified in the shipboard installation. The equipment weight shall not exceed 900 pounds and its attachment points to the target plate shall not extend beyond a 15-inch diameter area on the target plate centered about the equipment’s centroid. A clearance of at least 6 inches shall be maintained between an internal shell mounted item and the paddle wheel backing plate when installed in the paddle wheel.

(2) Submarine end closure/closure bulkhead mounted items not directly backed by pressure hull frames or external stiffeners. Technical Authority approval shall be obtained for the test to be performed as either shell mounted (see 1.2.6.3) or frame mounted (see 1.2.6.5).

(3) Surface ship mast mounted items. In order to meet the requirements of 3.1.6.4, non-standard testing is generally required for mast mounted items. Alternate shock testing vehicles/machines may be used to provide a technically acceptable alternative on a case basis subject to Technical Authority review and approval. Mast mounted equipment ordering data shall include shipboard location and equipment shock test requirements.

f. Separately specified limitations. Acquisition documents may specify the shock test category, or may impose additional limitations upon selection of the test category (see 6.2.2).

3.1.3 Selection of shock grade (see 1.2.2). Shock grade shall be as specified (see 6.2.1). If shock grade is not specified, acceptance of tested items shall be based upon requirements for Grade A items (see 3.1.10.1), unless otherwise approved by the Technical Authority.

3.1.4 Selection of equipment type and class (see 1.2.3 and 1.2.4). Equipment type and class shall be as specified (see 6.2.1) or, if no type or class is specified, shall be selected to suit the types or classes described in 1.2.3 or 1.2.4.

3.1.5 Selection of shock test type (see 1.2.5). Shock test type shall be as specified (see 6.2.1).

3.1.5.1 Type A. The Type A test (principal unit test) shall be required in all cases, except as indicated in

3.1.5.2 and 3.1.5.3. The fact that subsidiary components and subassemblies of a principal unit have passed the

Type B or C shock test does not affect requirements for Type A testing.

3.1.5.2 Type B. The Type B test (subsidiary component test) shall be required in cases where Type A testing is not possible due to heavyweight shock test size or weight limitations (see 3.1.2.c and 6.2.1). The fact that subassemblies have passed Type C tests does not affect requirements for Type B testing. Type B testing may also be required by specifications (or may be recommended by the contractor for approval by the Technical Authority) to suit any of the following situations:

a. In cases where a subsidiary component (such as an electric motor) is associated with a wide variety of principal units, Type B testing of the item may be required by the acquisition documents for the purpose of providing reasonable assurance that the item will also pass subsequent Type A tests (when tested as a part of one or more principal units), and to support shock test extension or analysis.

b. In cases where a subsidiary component has failed during shock testing of a principal unit, repeat shock testing of the subsidiary component only (by Type B testing) may be permitted by the Technical Authority in lieu of repeat testing of the entire principal unit (see 3.1.11.5.1).

c. In cases where a subsidiary component is installed in a principal unit where the principal unit is re-qualified by shock extension, and in cases where a subsidiary component is installed in a principal unit and the principal unit is not re-qualified (e.g., controllers on the turbine generator), Type B testing may be required. The effect of the subsidiary component on the survivability of the principal unit must be evaluated in the shock extension process, regardless of whether or not the principal unit is designated for requalification. Additionally, limitations must be placed on the subsidiary component qualification based on the application and non-standard test performed to represent the principal unit installation.

3.1.5.3 Type C. The Type C test (subassembly test) shall be performed only when specified (see 6.2.1) or as approved by the Technical Authority. The Type C test may be required by specifications (or recommended by the contractor for consideration by the Technical Authority) for the same reasons as indicated in 3.1.5.2.a, 3.1.5.2.b, and

3.1.5.2.c. The contractor may also recommend performance of Type C tests in cases where subassemblies associated with a principal unit or subsidiary component are not available at the time the principal unit or subsidiary component is scheduled for shock testing (see 3.1.7.3).

3.1.6 Mounting and testing requirements. Items shall be mounted upon shock machines (see figures 1, 2, and

23), upon FSPs (see figures 3, 3a, 3b, and 4), or upon alternate shock test vehicles/machines for shock testing in the manner specified (see 6.2.1). 3.1.6.1 through 3.1.6.4 provide testing requirements, mounting requirements, and requirements applicable to selection or design of shock test mounting fixtures by the contracting activity, and provide requirements that shall be observed by the contractor in the event that the required mounting fixture design is not specified by the acquisition documents.

3.1.6.1 Mounting and testing of test items to the standard or non-standard test fixtures. Items, regardless of class, shall be mounted to the appropriate standard or non-standard fixture. The means of attachment of the item to the test fixture shall represent the means of attachment aboard ship, where possible. Where not possible, the means of attachment shall be at least as stiff, in the three orthogonal directions, as the shipboard attachment. Items that are not mounted directly to ship structure (e.g., valves suspended in pipe runs) may be attached to the appropriate standard or non-standard test fixture using additional support structure (such as block hangers for pipe hung components).

a. Class I equipment shall be shock tested mounted to the test fixture in the non-isolated mounting configuration (see 6.6.23).

b. Class II equipment shall be shock tested mounted to the test fixture in the isolated mounting configuration.

Class II equipment for which all isolation devices are Limited Displacement Capability Isolation Devices (LDCIDs)

(see 6.6.21), and where the equipment’s shock response frequency (SRF) is greater than 37 Hz, may be tested upon the mounts to Class I equipment requirements with approval by the Technical Authority. Class II equipment utilizing external LDCIDs and any internal non-LDCIDs shall be qualified to Class I/II equipment requirements, unless otherwise approved by the Technical Authority.

c. Class I/II equipment shall be shock tested mounted to the test fixture in the shipboard mounting configuration. Class I/II equipment that only uses LDCIDs may be tested to Class I equipment requirements with approval by the Technical Authority, including approval that the corresponding SRF requirements have been met.

d. Unless otherwise specified (see 6.2.1.i, 6.2.2.f), or if approved by the Technical Authority (see 6.5.y), Class III equipment shall be shock tested mounted to the test fixture in both the isolated and non-isolated mounting configurations. Class III equipment for which all isolation devices are LDCIDs, and where the equipment’s SRF is greater than 37 Hz, may be tested in the non-isolated mounting configuration to Class I equipment requirements with approval by the Technical Authority. Permission to do so is subject to the provision that the isolation devices, subbases, hold-down means, and other components unique to the isolation mounted installation are selected, designed, or shock tested to satisfy separately invoked shock requirements.

e. Medium weight shock machine test orientations and inclinations are provided in tables VI through X for surface ships and tables XI and XII for submarines. For cases where the item has application in both submarines and surface ships, test orientations and inclinations for submarine application shall be used. When an item is to be qualified on the medium weight shock machine for any mounting location excluding shell mounted equipment, it shall be tested for unrestricted orientation. When medium weight testing is required to be performed prior to knowing the actual shipboard mounting orientation, the item shall be tested for unrestricted mounting orientation, or vertical axis specified mounting orientation if appropriate (see 1.2.8). Additional criteria for selection and use of medium weight test fixtures are contained in 3.1.6.3.1 and 3.1.6.4.

f. For heavyweight or alternate vehicle/machine shock testing, consideration shall be given to the mounting orientation of the equipment aboard ship. If this equipment is to be qualified for vertical axis specified mounting orientation (see 1.2.8) or if the limiting mounting orientation is not known, testing in two test orientations may be required (see 3.1.8.3.1.b). Qualification of equipment for unrestricted mounting orientation (see 1.2.8) on the

Standard FSP, EFSP, IFSP, or LFSP will generally require testing in three test orientations (see 3.1.8.3.1.a).

g. For medium weight deck simulating shock testing, test items shall be mounted in the DSSM in the isolated mounting configuration, using an approved fixture, according to the following conditions:

(1) Equipment shall be positioned in the cage so that the vertical location of the principal unit CG during the test accurately represents the vertical location of the principal unit CG in the shipboard installation.

(2) Equipment shall be positioned in the cage so that the horizontal principal unit CG is located inside the internal cage dimensions and, where practicable, along the cage side-to-side center plane as depicted on figure 23.

3.1.6.2 Lightweight test fixtures. For lightweight shock tests, items to be tested shall normally be attached to the anvil plate of the lightweight shock machine by means of standard mounting fixtures 4A, 4C, 6D-1, 6D-2, 6E, or

11-C as shown on figures 7 through 12. If the required mounting fixture is not specified, an appropriate standard fixture shall be selected by the contractor (see 3.1.6.4), or the contractor may recommend the use of a non-standard fixture that complies with 3.1.6.4 for approval by the Technical Authority. The test item shall be mounted directly to standard or non-standard fixtures. No intermediate fixtures or interface fixtures are to be used except as indicated in 3.1.6.2.1. When the item has been mounted for test upon a standard or non-standard fixture, its position upon the fixture shall not be changed to accomplish the required orthogonal blows during the course of the test (see 3.1.8.1).

3.1.6.2.1 Modifications to fixture 4C of figure 8 and fixture 11-C of figure 12. To minimize mounting plate and fixture replacement due to excessive perforation of the mounting plates, the test facility may specify installation patterns for the ½ inch bolts in the mounting plates of these fixtures to allow for universal mounting arrangements using adaptor plates, contingent upon review and approval by the Technical Authority.

3.1.6.3 Medium weight test fixtures. For medium weight shock tests, items to be tested shall normally be attached to the medium weight shock machine anvil table by means of the standard or non-standard mounting fixtures referred to in 3.1.6.3.1. If the required mounting fixtures are not specified, appropriate standard fixtures shall be selected by the contractor (see 3.1.6.4), unless use of one or more non-standard fixtures that comply with

3.1.6.4 is recommended by the contractor with substantiating technical justification and approved by the Technical

Authority. Note that different test fixtures may be required for…