NES 748 Requirements for Strainers in HM Surface Ships and Submarines - Category 2

Requirements for Strainers in HM SurfaceShips and Submarines

Ministry of Defence Defence Standard 02-748

Issue 2 Publication Date 26 September 2002

Category 2

AMENDMENTS ISSUED SINCE PUBLICATION

AMD NO DATE OFISSUE

TEXT AFFECTED SIGNATURE &DATE

Revision Note

This Issue of this Standard has been prepared to incorporate changes to text and presentation.The technical content has been updated in line with current practice.

Historical Record

Def Stan 02-748 Issue 1 1 April 2000NES 748, Issue 3 October 1989NES 748, Issue 2NES 748, Issue 1

1DEFENCE STANDARD 02748 (NES 748)

REQUIREMENTS FOR STRAINERS IN HM SURFACE SHIPSAND SUBMARINES

ISSUE 2

This Defence Standard is

authorized for use in MOD contracts

by the Defence Procurement Agency and

the Defence Logistics Organization

Published by:

Defence Procurement AgencyAn Executive Agency of The Ministry of DefenceUK Defence StandardizationKentigern House65 Brown StreetGlasgow G2 8EX

DEF STAN 02748 / ISSUE 2 (NES 748 )

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SCOPE

1. This Defence Standard (DEF STAN) in conjunction with the documents referred to herein,specifies the general design requirement for strainers, capable of removing particulate matterin the range 50 m to 6 mm, fitted in the fluid systems of HM Surface Ships and Submarines.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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FOREWORDSponsorship

1. This Defence Standard (DEF STAN) is sponsored by the Warship Support Agency (WSA),Ministry of Defence (MOD).

2. Any user of this Standard either within MOD or in industry may propose an amendment toit. Proposals for amendments that are not directly applicable to a particular contract shall bemade to the publishing authority identified on Page 1, and those directly applicable to aparticular contract shall be dealt with using existing departmental procedures.

3. If it is found to be unsuitable for any particular requirement, MOD shall be informed in writingof the circumstances.

4. No alteration shall be made to this Standard except by the issue of an authorized amendment.

5. Unless otherwise stated, reference in this Standard to approval, approved, authorized andsimilar terms means by the MOD in writing.

6. Any significant amendments that may be made to this Standard at a later date will be indicatedby a vertical sideline. Deletions will be indicated by 000 appearing at the end of the lineinterval.

7. Extracts from British Standards quoted within this Standard have been included with thepermission of the British Standards Institution.

8. This Standard has been reissued due to a Technical and Editorial update.

Conditions of ReleaseGeneral

9. This Standard has been devised solely for the use of the MOD, and its contractors in theexecution of contracts for the MOD. To the extent permitted by law, the MOD hereby excludesall liability whatsoever and howsoever arising (including but without limitation, liabilityresulting from negligence) for any loss or damage however caused when the Standard is usedfor any other purpose.

10. This document is Crown Copyright and the information herein may be subject to Crown orthird party rights. It is not to be released, reproduced or published without written permissionof the MOD.

11. The Crown reserves the right to amend or modify the contents of this Standard withoutconsulting or informing any holder.

MOD Tender or Contract Process12. This Standard is the property of the Crown. Unless otherwise authorized in writing by the

MOD it must be returned on completion of the contract, or submission of the tender, inconnection with which it is issued.

13. When this Standard is used in connection with a MOD tender or contract, the user shall ensurethat he is in possession of the appropriate version of each document, including relateddocuments, relevant to each particular tender or contract. Enquiries in this connection maybe made to the authority named in the tender or contract.

14. When Defence Standards are incorporated into MOD contracts, users are responsible for theircorrect application and for complying with contractual and any other statutory requirements.Compliance with a Defence Standard does not of itself confer immunity from legal obligations.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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Categories of Standard15. The Category of this Standard has been determined using the following criteria:

a. Category 1. If not applied may have a Critical affect on the following:

Safety of the vessel, its complement or third parties.

Operational performance of the vessel, its systems or equipment.

b. Category 2. If not applied may have a Significant affect on the following:

Safety of the vessel, its complement or third parties.

Operational performance of the vessel, its systems or equipment.

Through life costs and support.

c. Category 3. If not applied may have a Minor affect on the following:

MOD best practice and fleet commonality.

Corporate Experience and Knowledge.

Current support practice.

Related Documents16. In the tender and procurement processes the related documents listed in each section and

Annex A can be obtained as follows:

a. British Standards British Standards Institution,389 Chiswick High Road,London, W4 4AL.

b. Defence Standards Defence Procurement Agency,An Executive Agency of The Ministry of Defence,UK Defence Standardization,Kentigern House,65 Brown Street,Glasgow, G2 8EX.

c. Other documents Tender or Contract Sponsor to advise.

17. All applications to Ministry Establishments for related documents shall quote the relevantMOD Invitation to Tender or Contract number and date, together with the sponsoringDirectorate and the Tender or Contract Sponsor.

18. Prime Contractors are responsible for supplying their subcontractors with relevantdocumentation, including specifications, standards and drawings.

Health and SafetyWarning

19. This Standard may call for the use of processes, substances and/or procedures that may beinjurious to health if adequate precautions are not taken. It refers only to technical suitabilityand in no way absolves either the supplier or the user from statutory obligations relating tohealth and safety at any stage of manufacture or use. Where attention is drawn to hazards,those quoted may not necessarily be exhaustive.

20. This Standard has been written, and shall be used, taking into account the policy stipulatedin JSP430 MOD Ship Safety Management System Handbook.

Additional Information(There is no relevant information included)

DEF STAN 02748 / ISSUE 2 (NES 748 )

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CONTENTSPage No

TITLE PAGE 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SCOPE 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FOREWORD 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sponsorship 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conditions of Release 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Categories of Standard 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Documents 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Health and Safety 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Additional Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONTENTS 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 1. PERFORMANCE SPECIFICATION 7. . . . . . . . . . . 1.1 General 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2. NATIONAL/INTERNATIONAL REGULATIONS 72.1 Lifting 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3. MILITARY STANDARDS/REQUIREMENTS 7. . . . 3.1 Drawings 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Environmental Requirements 8. . . . . . . . . . . . . . . . . . 3.3 Oils and Greases 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Installation Requirements 8. . . . . . . . . . . . . . . . . . . . . 3.4.1 Lifting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.2 Location 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 Noise Shock and Vibration 8. . . . . . . . . . . . . . . . . . . . 3.6 Test Requirements 8. . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7 Preparation for Dispatch 8. . . . . . . . . . . . . . . . . . . . . . 3.8 Marking 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4. DESIGN REQUIREMENTS/GUIDANCE 9. . . . . . . 4.1 General 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 Materials 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 5. CORPORATE EXPERIENCE & KNOWLEDGE 10. 5.1 General 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Basket Strainer 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 5.1 Illustration of a Typical Simplex Basket Strainer 11. . Figure 5.2 Illustration of a Typical Duplex Strainer 11. . . . . . . . . 5.3 Straight Through Flow Basket Strainer 12. . . . . . . . Figure 5.3 Illustration of a Typical StraightFlow Strainer 12. . . 5.4 Y Type Strainer 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 5.4 Illustration of a Typical YType Strainer 13. . . . . . . .

DEF STAN 02748 / ISSUE 2 (NES 748 )

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Page No5.5 Strainer Selection 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 5.1 Codified Strainer Types and Sizes 14. . . . . . . . . . . . . . Table 5.2 Previously Used Materials 14. . . . . . . . . . . . . . . . . . . . .

ANNEX A RELATED DOCUMENTS 15. . . . . . . . . . . . . . . . . . . .

ANNEX B ABBREVIATIONS 16. . . . . . . . . . . . . . . . . . . . . . . . . . .

ANNEX C PROCUREMENT CHECK LIST 17. . . . . . . . . . . . . . .

ALPHABETICAL INDEX 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DEF STAN 02748 / ISSUE 2 (NES 748 )

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1. PERFORMANCE SPECIFICATION

Related Documents: There are no Related Documents in this Section.

1.1 General

a. Where possible Strainers capable of removing particulate matter in the rangeof 50 m to 6 mm from fluid systems in HM Surface Ships and Submarines shallbe selected from commercially available ranges.

b. Selected Strainers and their materials shall be fit for purpose for theapplication(s) for which they are selected. The operating medium shall bestated in the System Requirement Document (SRD).

c. The standard of filtration required shall be stated in the SRD.

d. Strainers for use in HM Surface Ships and Submarines shall have a maximumWorking Pressure (WP) of 10 bar (1 Mpa); where WP in excess of 10 bar isrequired it shall be stated in the SRD.

e. WP for sea connected Strainers fitted in HM Submarines shall be stated in theSRD.

f. Strainers shall have a maximum Working Temperature (WT) of 120C; whereWT in excess of 120C is required this shall be stated in the SRD.

2. NATIONAL/INTERNATIONAL REGULATIONS

Related Documents: LOLER 1998; see also Annex A.

2.1 Lifting (See also Military Standards/Requirements)

a. Lifting activities and components/equipment shall conform to the LiftingOperations and Lifting Equipment Regulations 1998 (LOLER).

3. MILITARY STANDARDS/REQUIREMENTSRelated Documents: DEF STAN 015; DEF STAN 02302 Part 1; DEF STAN 02722;DEF STAN 0534; DEF STAN 08103 Part 2; DEF STAN 08123; BR 3021(1); BR3021(2); BR 8470; BR 8471; BR 8472; BR 8470; see also Annex A.

3.1 Drawings

a. Drawings shall conform to requirements of DEF STAN 02722.

b. Drawings supplied by the manufacturer shall show the following:

(1) Overall dimensions;

(2) Mounting arrangements;

(3) General arrangement;

(4) Maintenance envelope, lifting points and centre of gravity, as detailed inDEF STAN 02302 Part 1 and DEF STAN 08103 Part 2;

(5) Parts list;

(6) Assemblies;

(7) Subassemblies;

(8) Pressure drop characteristics and viscosity corrections.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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3.2 Environmental Requirements

a. Strainers shall be capable of operating efficiently under the environmentalconditions stated in DEF STAN 08123.

3.3 Oils and Greases

a. Requirements for any oils or greases to be used for any purpose shall, whereverpossible, be selected from those listed in DEF STAN 015 Fuels, Lubricants andAssociated Products. If this is not possible it shall be brought to the attention ofthe Prime Contractors Office (PCO) and/or the Warship SupportAgency/Marine Propulsion Systems IPT, WSA/MPS216, as applicable.

3.4 Installation Requirements

3.4.1 Lifting (See also National/International Regulations)

a. Strainers shall be provided with lifting points where appropriate.

b. If lifting gear is required to move components, it shall be used only on the liftingpoints provided.

3.4.2 Location

a. Space envelopes, for operation, maintenance and cleaning of Strainers shall beas specified in DEF STAN 02302 Part 1 or DEF STAN 08103 Part 2 asappropriate.

3.5 Noise Shock and Vibration

a. Strainers for use in HM Surface Ships shall be shock rated to Naval ShockStandard (NSS)1, in accordance with BR 3021(1). They shall also conform tothe requirements of BR 3021(2), BR 8470, BR 8471, BR 8472 and BR 8473 asapplicable.

b. The Noise, Shock and Vibration requirements for Strainers for use inSubmarines will be specified in the SRD.

3.6 Test Requirements

a. Each Strainer shall be hydrostatically tested, using clean water as the testmedium, to 1.5 times maximum WP, which shall be maintained for a minimumof 5 minutes during which time no leaks shall be allowed.

3.7 Preparation for Dispatch

a. On completion of testing, each Strainer shall be drained, cleaned and dried. Allmachined faces shall be adequately protected from mechanical damage andbranch openings shall be sealed to prevent the ingress of dirt or foreign matter.

3.8 Marking

a. Strainer bodies, baskets and covers shall be marked for identification inaccordance with DEF STAN 0534.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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4. DESIGN REQUIREMENTS/GUIDANCERelated Documents: There are no Related Documents in this Section.

4.1 General

a. Except where stated in the SRD Single Element Strainer Bodies shall be formedfrom a single casting with integral inlet and outlet branches. Double ElementStrainers may be assembled from multiple castings in order to incorporate flowcontrol components.

b. Double Element Strainers shall incorporate a balance cock or valve to separatethe Strainer chambers and permit changeover without hydraulic shock. Thedesign of the changeover mechanism shall allow for uninterrupted system flowduring changeover.

c. Branch bores shall be circular on a common axis and the diameters shall be inaccordance with the nominal size of the Strainer. For information relating toStrainer sizes previously used refer to Clause 5.5e and Table 5.1.

d. Where inlet and outlet connections are flanged, the flanges shall be at rightangles to the axis of the branch and concentric with the bore. Flanges shall bedrilled in accordance with the requirements of the SRD.

e. Where inlet and outlet connections are to be welded, the weld preparation shallbe specified in the SRD.

f. Where inlet and outlet connections are threaded, the threadform shall bespecified in the SRD.

g. Where practicable, Strainer bodies shall be provided with machined drain andvent bosses to dimensions appropriate to the filter body size. Vent and drainplugs shall be provided which shall be manufactured from materials which arecompatible with the Strainer body material.

h. Quick release covers are preferred. Where these are provided, removal andfitting should not require the use of tools. Strainer cover joint faces shall bemachined.

i. With the exception of clearance holes for fastenings, all covers shall be fittedwith full area gaskets or toroidal seals as appropriate.

j. Perforation/mesh size shall be appropriate to the degree of filtration specified inthe SRD.

k. Where shock mounting pads are specified, they shall be cast as an integral partof the Strainer body.

l. An arrow shall be cast on the Strainer body to indicate direction of flow. Wherealternative methods of indicating flow are proposed they shall be referred toWSA/MPS216 for approval.

m. The freeflow area characteristic of the Strainer (based on the ratio of open areathrough the Strainer basket to area of inlet branch) shall be not less than thevalue stated in the SRD. See also Clause 5.5b.

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4.2 Materials

a. Strainers shall be of robust construction and manufactured from materialswhich are fit for purpose and suitable for installation in Naval Vessels. Forpreviously used suitable materials refer to Clause 5.5f. and Table 5.2.

b. Overall Material Design shall embody advances in design concept and newdevelopments in technology, which may lead to innovative and alternativeproposals or solutions.

c. Any proposal to use materials not previously employed for similar duty shall besubmitted to WSA/MPS216 for approval.

5. CORPORATE EXPERIENCE & KNOWLEDGE

Related Documents: BS EN 1982; BS 3072; DEF STAN 02-830 Part 1; DEF STAN07-253 Part 1; DEF STAN 07-261 Parts 3, 4 and 5; see also Annex A.

5.1 General

a. The two fundamental types of pipeline Strainers in current use and previouslyused are the Basket Type and the Y-Type. Additionally, a straight-throughflow variant of the Basket Strainer would be specified for use within sea watersystems.

5.2 Basket Strainer

a. Basket Strainers would generally be used where there is a requirement forregular or frequent cleaning, because they hold considerably more entrappedmaterial and offer less pressure drop than Ytype Strainers.

b. Because this type of Strainer would be fitted where cleaning often occurs, thebasket(s) would be made to be removed and replaced as simply as possible. Ayoke type cover would be suitable for smaller sizes where the Strainer coverwould be held down by a clamping yoke sturdy enough to hold full line pressure,which could be quickly loosened or tightened by hand. In larger Strainers itwould be more appropriate to secure the cover at multiple points e.g. by usingswing bolts and butterflynuts.

c. Basket Strainers would be installed upright and the basket lifted out from thetop. This imposes system design constraints requiring that the Strainer beinstalled in a horizontal line with an adequate space envelope for basketremoval/replacement.

d. Basket Strainers would be used in both Single and Double Elementapplications.

e. Systems would be configured to allow Single Element Strainers to be isolatedfor basket cleaning.

f. Figure 5.1 shows the functionality of a Single Element Strainer.

g. Double Element Strainers would be appropriate where there is a requirementto clean Strainer elements without interrupting the service in which theStrainer is fitted. An example of a Double Element Strainer is shown inFigure 5.2.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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Figure 5.1 Illustration of a Typical Single Element Strainer

Figure 5.2 Illustration of a Typical Double Element Strainer

DEF STAN 02748 / ISSUE 2 (NES 748 )

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5.3 Straight Through Flow Basket Strainer

a. Straightthrough Flow Strainers, have low pressure drop characteristics andare particularly suitable for applications such as main sea suction systems inplace of sludge/weed boxes.

b. Straightthrough Flow Strainers are smaller and lighter than sludge/weedboxes, taking up approximately half their weight and space. Pleated orconvoluted basket design would be employed to increase the straining areawhile minimising basket size.

c. An example of a Straightthrough Flow Strainer is shown in Figure 5.3.

Figure 5.3 Illustration of a Typical StraightThrough Flow Strainer

5.4 Y Type Strainer

a. Ytype Strainers could be installed in either horizontal or vertical pipework or, ifrequired, an orientation in between. However, whichever configuration is used,the Strainer would be installed with the screen down, so that entrappedmaterial could be collected efficiently.

b. Ytype Strainers would only be used where the cleaning requirement isinfrequent.

c. An example of a Ytype Strainer is shown at Figure 5.4.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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Figure 5.4 Illustration of a Typical Y-Type Strainer

5.5 Strainer Selection

a. Size for size, Ytype Strainers offer less dirt holding capacity and a largerpressure drop than basket Strainers.

b. The open area ratio of a Strainer describes the amount of free open area of theStrainer and Basket. It is the ratio of the open area through a clean StrainerBasket to the cross sectional area of the pipeline. A basket Strainer should havean open ratio of at least 4 : 1; anything less may cause an excessive pressuredrop.

c. Manufacturers can assist in identifying the appropriate type of Strainer for aparticular application. It is important that operating medium viscosity,acceptable particle size and pressure drop are taken into account. Additionaldesign data is available online from Strainer manufacturers.

d. There are no industrywide standards for face to face dimensions for flangedStrainers. Therefore, the Strainer from one manufacturer may not physicallyfit into pipework designed for a different brand of Strainer.

e. Table 5.1 indicates Strainers by type and size that have been codified and usedpreviously. The table is not exhaustive and additional information relating toprevious applications is available from WSA/MPS216.

f. Table 5.2 lists materials previously found suitable for Strainers. The table isnot exhaustive and materials specified to equivalent or superior national orinternational standards may be appropriate.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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NominalBore(mm)

20 25 40 50 65 80 100 125 150 200 250 300 400 500

Single ElementType

x x x x x x x x x

Double ElementType

x x x x x x x x

StraightThrough-FlowBasketType

x x x x x x x x x x x

Table 5.1 Codified Strainer Types and Sizes

ITEM MATERIAL SPECIFICATION

Body Gunmetal

Al.B

DEF STAN 02830 Part 1

BS EN 1982

Basket Nickel Alloy (Monel)CuNi

BS 3072

DEF STAN 07253 Part 1

Cover As Strainer body

Valve Bodies As Strainer body

Fastenings Steel

Steel Zinc Plated

CuNi

DEF STAN 07261 Part 3

DEF STAN 07261 Part 4

DEF STAN 07261 Part 5

Table 5.2 Previously Used Materials

DEF STAN 02748 / ISSUE 2 (NES 748 )

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ANNEX A.A.

RELATED DOCUMENTS

A1. The following documents and publications are referred to in this Standard:

LOLER 1998 Lifting Operations and Lifting Equipment Regulations 1998.

BS EN 1982 Copper and Copper Alloys. Ingots and Castings.

BS 3072 Specification for Nickel and Nickel Alloy Sheet and Plate.

JSP 430 Ship Safety Management System Handbook:

Volume 1: Policy and Guidance on MOD Ship and EquipmentSafety Management.

DEF STAN 015 Fuels, Lubricants and Associated Products.

DEF STAN 02302(NES 302 Part 1)

Requirement for Maintenance Envelopes and Removal Routes:

Part 1: HM Surface Ships.

DEF STAN 02722(NES 722)

Requirements for Drawings.

DEF STAN 02830(NES 830)

Requirement for Gunmetal Ingots and Castings:

Part 1: Gunmetal Ingots and Class 3 Gunmetal Castings.

DEF STAN 0534 Marking of Service Materiel.

DEF STAN 07253(NES 780)

Requirements for 70/30 Copper Nickel Alloy Material:

Part 1: Sheet, Strip, Plate.

DEF STAN 07261(NES 862)

Fasteners:

Part 3: Ferrous Fasteners;

Part 4: Ferrous (Submarine First Level Quality Assured);

Part 5: NonFerrous (Submarine First Level Quality Assured).

DEF STAN 08103(NES 302 Part 2)

Requirement for Maintenance Envelopes and Removal Routes:

Part 2: Requirements for Submarines.

DEF STAN 08123(NES 1004)

Requirements for Design and Testing of Equipments to MeetEnvironmental Conditions.

BR 3021(1) Shock Manual (Metric).

BR 3021(2) Shock Manual (Metric).

BR 8470 Shock and Vibration Manual.

BR 8471 Mounting System Design, Installation and Maintenance.

BR 8472 Naval Standard Range Mounts for Equipment (To AttenuateMechanical Shock or Vibration.

BR 8473 Miscellaneous Mounts for Equipment Installation (To AttenuateMechanical Shock or Vibration).

DEF STAN 02748 / ISSUE 2 (NES 748 )

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ANNEX B.B.

ABBREVIATIONS

B1. For the purpose of this Standard the following abbreviations apply.

BR Book of Reference

BS British Standard

BS EN British Standard European

DEF STAN Defence Standard

IPT Integrated Project Team

JSP Joint Service Publication

LOLER Lifting Operations and Lifting Equipment Regulations

MOD Ministry of Defence

MPS Marine Propulsion Systems

NES Naval Engineering Standard

NSS Naval Shock Standard

PCO Prime Contractors Office

SRD System Requirement Document

WP Working Pressure

WSA Warship Support Agency

WT Working Temperature

DEF STAN 02748 / ISSUE 2 (NES 748 )

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ANNEX C.C.

PROCUREMENT CHECK LIST

Notes:

C.1 This Check List is to ensure that certain aspects of this Defence Standard are consulted when preparing a procurement specification for a particular applicationapplication.

C.2 Clauses where a preference for an option is to be used or where specific data is to be added are included in the Check List.

C.3 Each item is to be marked either:

= included

NA = not applicable

CHECKNo

CHECK CLAUSE No or NA

1 Operating medium specified. 1.1b.

2 Filtration standard specified. 1.1c.

4.1j.

3 Maximum working pressure specified. 1.1.d

1.1e.

4 Maximum working temperature specified. 1.1f.

5. Fuels, Lubricants and Associated Products thatcannot be selected from DEF STAN 015.

3.3

6. Shock rating specified. 3.5

7 Fabrication method specified. 4.1a.

8 Flange and flange drilling table specified. 4.1d.

9. Welded connection style and preparation specified.

4.1e.

10. Threadform specified. 4.1f.

11. Minimum free flow characteristic specified. 4.1m.

12. Alternative Method for Indicating Flow 4.1l.

13. Materials not previously employed for similarduty.

4.2c.

DEF STAN 02748 / ISSUE 2 (NES 748 )

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CCasting, 9

Cleaning, 10

DDirection of Flow, 9

Drain and Vent, 9

FFlanges, 9

Fliltration Standard, 7

HHydraulic Shock, 9

Hydrostatic Testing, 8

LLifting Points, 7, 8

Lubricants, 8

MMaterials, 10

OOpen Area Ratio, 13

Operating Medium, 7

SSea Connected Strainers, 7

TTemperature, 7

WWorking Pressure, 7

Inside Rear Cover

Crown Copyright 2002

Copying Only as Agreed with DStan

Defence Standards are Published by and Obtainable from:

Defence Procurement AgencyAn Executive Agency of The Ministry of Defence

UK Defence StandardizationKentigern House65 Brown Street

GLASGOW G2 8EX

DStan Helpdesk

Tel 0141 224 2531/2 Fax 0141 224 2503

Internet e-mail [email protected]

File Reference

The DStan file reference relating to work on this standard is D/DStan/69/02/748.

Contract Requirements

When Defence Standards are incorporated into contracts users are responsible for their correctapplication and for complying with contractual and statutory requirements. Compliance witha Defence Standard does not in itself confer immunity from legal obligations.

Revision of Defence Standards

Defence Standards are revised as necessary by up issue or amendment. It is important thatusers of Defence Standards should ascertain that they are in possession of the latest issue oramendment. Information on all Defence Standards is contained in Def Stan 00-00 Standardsfor Defence Part 3 , Index of Standards for Defence Procurement Section 4 Index of DefenceStandards and Defence Specifications published annually and supplemented regularly byStandards in Defence News (SID News). Any person who, when making use of a DefenceStandard encounters an inaccuracy or ambiguity is requested to notify the Directorate ofStandardization (DStan) without delay in order that the matter may be investigated andappropriate action taken.

CONTENTSTITLE PAGESCOPEFOREWORDSponsorshipConditions of ReleaseCategories of StandardRelated DocumentsHealth and SafetyAdditional Information

1. PERFORMANCE SPECIFICATION1.1 General

2. NATIONAL/INTERNATIONAL REGULATIONS2.1 Lifting (See also Military Standards/Requirements)

3. MILITARY STANDARDS/REQUIREMENTS3.1 Drawings3.2 Environmental Requirements3.3 Oils and Greases3.4 Installation Requirements3.4.1 Lifting (See also National/International Regulations)3.4.2 Location

3.5 Noise Shock and Vibration3.6 Test Requirements3.7 Preparation for Dispatch3.8 Marking

4. DESIGN REQUIREMENTS/GUIDANCE4.1 General4.2 Materials

5. CORPORATE EXPERIENCE & KNOWLEDGE5.1 General5.2 Basket StrainerFigure 5.1 Illustration of a Typical Single Element StrainerFigure 5.2 Illustration of a Typical Double Element Strainer

5.3 Straight Through Flow Basket StrainerFigure 5.3 Illustration of a Typical StraightThrough Flow Strainer

5.4 Y Type StrainerFigure 5.4 Illustration of a Typical Y-Type Strainer

5.5 Strainer SelectionTable 5.1 Codified Strainer Types and SizesTable 5.2 Previously Used Materials

ANNEX A. RELATED DOCUMENTSANNEX B. ABBREVIATIONSANNEX C. PROCUREMENT CHECK LISTALPHABETICAL INDEX