1、A-A-59008 9399774 0175216 T5T I INCH-POUND I A-A-59008 22 July 1997 COMMERCIAL ITEM DESCRIPTION STRAINERS, SELF-CLEANING, BACKFLUSH TYPE (MANUAL OR AUTOMATED) The General Service Administration has authorized the use of this commercial item description, for all federal agencies. 1. SCOPE 1.1 Score.
2、This commercial item description covers both manual and automated backflush type self-cleaning strainers. 1.2 Intended use. The strainers specified are intended for installation in sea water piping systems on the discharge side of the pump. 2. CLASSIFICATION 2.1 Classification. Backflush type self-c
3、leaning strainers shall be of the following types, classes, styles, and sizes as specified (see 7.1): Type I - Manual. Type II - Automated. Class 150 - 150 pounds per square inch gage (psig) pressure Class 250 - 250 psig pressure rating. rating. Style 1 - Rotational divider, sizes 2, 3, 4, 6, 8, 10,
4、 12, Style 2 - Rotational backwash arm, sizes 2, 3, 4, 6, 8, 10, 14, 16, 20 and 24 inch. 12, 14, 16, 18, 20 and 24 inch. Beneficial comments, recommendations, additions, deletions, clarifications etc. and any other data which may improve this document should be sent to: Commander, SEA 03R42, Naval S
5、ea Systems Command, 2531 Jefferson Davis Hwy, Arlington, VA 22242-5160. AMSC N/A FSC 4730 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A - A-5 9 O O 8 D 9999974 0175
6、217 996 A-A-59 008 3. SALIENT CHARACTERISTICS 3.1 Codes and standards. Strainer shall comply with the applicable requirements of Table I. 3.2 Desian and constxuction. Each strainer shall be of the type, class, style, and size as specified (see 2.1). The self cleaning action shall remove particulate
7、contaminants from the sea water system without interrupting the operation of that system. The straining element shall be cleaned in segments such that the particulate contaminants are flushed free of the strainer. 3.3 Material. The material requirements for all strainer components shall be in accord
8、ance with Table II. TABLE I. Reference data. MIL-F-20042 raised face flanges MIL-M-17059 3.4 Strainina element. The straining element shall be made of one unit. The element shall be of the perforated plate or plate type construction. All seam welds shall be continuous. 3.4.1 Strainino element comtme
9、ssion strenoth test. The straining element shall be tested by applying a differential pressure (outside-inside) across the straining element equal to 100 percent of the specified strainer design pressure for the applicable type and class, using water for a duration of 5 minutes. or less. Differentia
10、l pressure shall be applied in a rapid manner, one minute 3.4.2 Straininu element emansion strenuth test. The straining element shall be tested by applying a differential pressure (inside-outside) across the straining element equal to 100 percent of the specified strainer design pressure for the app
11、licable type and class, using water for a duration of 20 minutes. Differential pressure shall be applied in a rapid manner, one minute or less. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59008 m 9999974 0375238 822 m . A-A- 5 90 08 3.5 Act
12、uation. Each strainer shall be fitted with a shaft along its rotational axis, which penetrates the compartment cover through a watertight seal. Outside the housing, the shaft shall be capable of being fitted with either a handle (Type I) or an electric motor actuator (Type II). Each type I strainer
13、shall be sized and configured so that maximum required operating force is less than 50 pounds. For certain hazard areas, such as installation in a JP-5 pump room, type II strainer motors shall be explosion proof. TABLE II. Materials reauired for strainers. Part Bodies, covers Col lar, hand1 e self c
14、leaning mechanism Threaded fasteners O II -ring Straining element Mat er i al Copper-nickel NiA1 bronze Cast tin bronze CRES NiA1 bronze NiCu alloy Fluorocarbon CuNi plate NiCu date Applicable documents Remarks ASTM B 369 C96400 ASTM B 148 C95800 ASTM B .61 C92200, ASTM A 276 C31600 ASTM B 127 NO440
15、0 ASTM B 148 C95800 ASTM F 467 N04400, NO4405 ASTM F 468 MIL-R-83248/1 For all except threaded bosses MIL-R-83248/2 Threaded bosses 1 ASTM B 122 C71500 3.6 Self cleanina mechanism. 3.6.1 Stvle 1. The straining element is divided by a vertical partition which yields 2 - halves of a cylindrical elemen
16、t. At the bottom of each half, there is a drain connection which will be used to connect backflush valves at installation. Backflushing is accomplished by rotating the divider handle 180, diverting flow to the clean half of the element, and then opening the drain valve of the dirty half. A portion o
17、f the fluid, flows back through the dirty element freeing the contaminant and allowing the debris to be flushed from the strainer. Fluid use to flush the debris out of the strainer shall not exceed 15% percent of the total flow through the strainer assembly. Strainer shall be fitted with two flushin
18、g connections one for each partitioned straining compartment. 3.6.2 Stvle 2. The straining element is cleaned by a hollow backwash arm which rotates inside the element. Backflushing is accomplished by opening the drain valve, diverting fluid flow back through a portion of the element. The debris flo
19、ws into hollow backwash arm and out of the strainer. The backwash arm then rotates to the next portion of the element. Fluid used to flush the debris out of the strainer shall not exceed 15% percent of the total flow through the strainer assembly. 3 Provided by IHSNot for ResaleNo reproduction or ne
20、tworking permitted without license from IHS-,-,-A-A-59008 D 9999974 OL752L9 769 D A-A- 5 900 8 3.7 Covers. Covers shall be flanged and attached to the body by bolts. Each cover shall effect a positive seal on an O-ring. 3.8 Functional Derformance. Unless otherwise specified (see 7-11, design flow ca
21、pacity, design temperature, and clean pressure drop shall be as specified in Table III. 3.8.1 ODerational cvclina tests. The strainer shall be tested for a total of 600 hours at design pressure and flow rates. once every hour during testing period. At the completion of the 600 hours, compliance with
22、 the required operating force of 50 pounds or less and zero leakage shall be demonstrated. Upon satisfactory completion of this test the unit shall be refurbished to new condition before being offered for delivery. 3.9 EnveoDe dimensions. Envelope dimensions shall be in accordance with Table IV. Str
23、ainer shall be backflushing 3.10 WorkmanshiD. The strainer body and covers shall be of uniform quality and condition, free from blow holes, porosity, hard spots, shrinkage defects, cracks, and other defects. All surfaces shall be smooth and well cleaned. The inside surfaces of strainers shall be wel
24、l cleaned and free from sharp edges. TABLE III. Functional Derformance. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A- 5 9 O0 8 TABLE IV. EnveloDe dimensions. 4. REGULATORY REQUIREMENTS 4.1 Recovered ma terials . The offeror/contractor is enc
25、ouraged to use recovered materials to maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR). 4.2 Prohibited material. Zinc or cadmium plating shall not be used on any part of the strainer. 4.3 percurv exclusion. The strainer shall be free of merc
26、ury contamination. During the manufacturing process, tests, and examination, the product to be offered for acceptance shall not come in direct contact with mercury or any of its components, nor with any mercury containing device employing a single boundary of containment. 5. QUALITY ASSURANCE PROVIS
27、IONS 5.1 Product conformance. The products provided shall meet the salient characteristics of this comercial item description, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same production offered for sale in the commercial market. The
28、government reserves the right to reqLre proof of such conformance. 5.2 Additional inmectiog. Where other specifications form a part of this specification, sampling, examination, and tests shall be conducted as required by the pertinent specification, unless otherwise specified in the contract or ord
29、er (see 7.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59008 9999974 0175221 317 W A-A-590 O 8 I 6. PACKAGING 6.1 General reauirement . Commercial packaging shall be in accordance with the requirements of ASTM D 3951. . Shipping containers
30、 exceeding 200 pounds gross 6.1.1 Container modification weight shall be provided with a minimum of two, 3- by 4-inch nominal wood skids laid flat, or a skid- or sill-type base which will support the material and facilitate handling by mechanical handling equipment during shipment, stowage, and stor
31、age. 7. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) . Acquisition documents must specify the 7.1 A-ments following. . Title, number, and date of this commercial item description. Type, class, and style required (see 2.1). St
32、raining element design and characteristics (see 3.4). Whether alternate motor design is required (see 3.5). Whether gage connections are required at inlet and outlet The required design flow capacity, design pressure, design Quantity of technical manuals and drawings required (see 7.3). Whether repa
33、ir parts are required (see 7.5.1). Issue of DODISS to be cited in the solicitation, and if required, the specified issue of individual documents referenced (see 7.2.1.1). (see Table I). temperature, and clean pressure drop (see Table III). 7.2 Sourcecof. 7.2.1 Gove-t documents . The following docume
34、nts of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified. 7.2.1.1 -cations. standards. a nd handbooks . The following specifications, standards, and handbooks form a part of this document to the extent specified herei
35、n. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index cf Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 7.1). S PEC I FI CAT I ONS DEPARTMENT OF DEFENSE MIL-S-901 - Shock Tests, H.I.
36、 (High-Impact); Shipboard Machinery, Equipment, & Systems, Requirements for. Fractional H.P., Shipboard Use. MIL-M-17059 - Motors, 60-Cycle, Alternating Current, MIL-F-20042 - Flanges, Pipe, Bronze (Silver Brazing). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
37、se from IHS-,-,-A-A-59008 9999974 0175222 253 A-A- 59008 DEPARTMENT OF DEFENSE (Continued) MIL-M-38510 - Microcircuits, General Specification for. MIL-R-83248 - Rubber, Fluorocarbon Elastomer, High Performance Fluid and Compression Set Resistant. Temperature Fluid and Compression Set Resistant (O-Ri
38、ngs, Class 1, 75 Hardness). Pressure Fluid (O-Rings, Class 2, 60 Hardness) . MIL-R-83248/1 - Rubber, Fluorocarbon Elastomer, High MIL-R-83248/2 - Rubber, Fluorocarbon Elastomer, High STANDARDS DEPARTMENT OF DEFENSE MIL-STD-1686 - Electrostatic Discharge Control Program for Protection of Electrical a
39、nd Electronic Parts, Assemblies, and Equipment (Excluding Electrically Initiated Explosive Devices), Metric. (Unless otherwise indicated, copies of federal and military specifica- tions, standards, and handbooks are available from the Naval Publication and Forms Center, Standardization Documents Ord
40、er Desk, BLDG. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 7.2.2 Non-Government Dublications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of
41、the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 7.1). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 276 - Standard Specification for Stainless and Heat Resisting B
42、61 - Standard Specification for Steam or Valve Bronze B 122 - Standard Specification for Copper-Nickel-Tin Alloy, Steel Bars and Shapes. Castings. Copper Nickel-Zinc Alloy (Nickel Silver), and Copper- Nickel Alloy Plate, Sheet, Strip and Rolled Bar. B 127 - Standard Specification for Nickel-Copper A
43、lloy (UNS NO44001 Plate, Sheet, and Strip. B 148 - Standard Specification for Nickel Aluminum Alloy. B 369 - Copper Nickel Alloy Castings. D 3951 - Commercial Packaging, Practice for. F 467 - Standard Specification for Nonferrous Nuts for General F 468 - Standard Specification for Nonferrous Bolts,
44、Hex Cap Use. Screws, and Studs. (Application for copies should be addressed to the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2859.) 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59008 m 999
45、9974 0375223 39T m 8 A-A-5900 8 FLUID CONTROL INSTITUTE (FCI) 78-1 - Pressure Rating Standard For Pipeline Strainers Other Then “Y“ Type. (Application for copies should be addressed to the Fluid Control Institute, Inc., P.O. Box 3854, Tequesta, FL 33458.) INSTRUMENT SOCIETY OF AMERICA (ISA) S75.02 -
46、 Control Valve Capacity Test Procedure. (Application for copies should be addressed to the Instrument Society of America, 67 Alexander Dr., P.O. Box 12277, Research Triangle Park, NC 27709.) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) J 1926 - Specification for Straight Thread O-Ring Boss Port. (Applicati
47、on for copies should be addressed to the Society of Automotive Engineers Inc., 400 Common Wealth Drive, Warrendale, PA 15096-0001.) (Non-Government standards and other publications are normally available from the organization that prepares or distributes the documents. These documents also may be av
48、ailable in or through libraries or other informational services. ) 7.2.3 Order of mecedence. In the event of a conflict between the text of this commercial item description and the references cited herein, the text of this commercial item description takes precedence. Nothing in this commercial item
49、 description, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 7.3 Technical manuals. The requirement for technical manuals should be considered when this commercial item description is applied to a contract. If technical manuals are required, military specifications and standards which have been cleared and listed in DoD 5010.12-L (AMSDL) must be listed on a separate CDRL (DD Form 14231, include
