1、INCH-POUNDI MIL-T-2118C(SH) 22 Aumst 1990 SUPERSEDING 4 February 1972 (See 6.8) MIL-T-2118B(SHIPS) MILITARY SPECIFICATION TRAP, STEAM, ANGLE, THERMOSTATIC This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and
2、Agencies of the Department of Defense. 1. SCOPE 1.1 ScoDe. This specification covers the requirements for thermostatic steam traps for services up to 100 pounds per square inch (lb/in2). 1.2 ClassificatioA. sizes, as specified (see 6.2). Steam traps shall be of the following classes and Class I Clas
3、s II - High pressure (25 to 100 lb/in2, 338F maximum). - Low pressure (O to 25 lb/in2, 268 degrees Fahrenheit (OF) maximum). 1.2.1 Size. nominal pipe size (nps) on the inlet side of the trap. Sizes are listed in table I and range from 1/2 to 2 inches 1.2.2 Workine D ressure. Class I shall include wo
4、rking pressures of 5 lb/in2, 15 lb/in2 and 25 lb/in2. lb/in2, 35 lb/in2, 50 ib/in2, and 100 lb/in2. Class II shall include working pressures of 25 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to:
5、 Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 4730 DISTRIBUTION STATEMENT A. Approved for pub
6、lic release; distribution is unlimited. Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2. APPLICABLE DOCUMENTS 2.1 Governme nt docum ents. 2.1.1 SDecification s. standards. and h andbooks. The following speci
7、fi- cations, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the
8、solicitation (see 6.2). SPECIFICATIONS FEDERAL PPP-F-320 - Fiberboard; Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes. MILITARY MIL-P- 116 - Preservation, Methods of. MIL-F-1183 - Fittings, Pipe, Cast Bronze, Silver-Brazing, General Specification for. MIL-L-19140 - Lumber and Pl
9、ywood, Fire-Retardant Treated. STANDARDS MILITARY MIL-STD-1186 - Cushioning, Anchoring, Bracing, Blocking and MIL-STD-2073-1 - DoD Materiel Procedures for Development and Waterproofing; with Appropriate Test Methods. Application of Packaging Requirements. (Unless otherwise indicated, copies of feder
10、al and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.2 Non-Government Dubicatiom . The following document(s) form a part of this document to the extent specified herein. Unl
11、ess otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). Unless otherwise specified, the issues of AMERICAN
12、 NATIONAL STANDARDS INSTITUTE (ANSI) B46.1 - Surface Texture (Surface Roughness, Waviness and Lay). (DoD adopted) (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3951 - S
13、tandard Practice for Commercial Packaging. (DoD adopted) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(Non-
14、Government standards and other publications are normally available from These documents also the organizations that prepare or distribute the documents. may be available in or through libraries or other informational services.) 2.3 Order of mece dence. In the event of a conflict between the text of
15、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 First a rticle. When specified (see 6.2), a sample shall be subj
16、ected to first article inspection (see 6.4) in accordance with 4.4. 3.2 Hateru . The material for each part shall be as specified herein. However, where a definite material is not specified, an appropriate ASTM, AISI, or Federal specification material shall be used which will enable the traps to mee
17、t the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product (see 4.6.1). 3.2.1 -. Covers and bodies shall be made of ASTM, AISI, or Federal specification brass, bronze, or copp
18、er-nickel alloy acceptable for steam service. 3.2.2 Valve Dins an d rene wable seat s. Valve pins and renewable seats shall be made of the following ASTM, AISI, or Federal Specification materials: corrosion-resisting (chrome) steel, nickel, or copper-nickel alloy. 3.2.3 Therm ostatic el ements. Ther
19、mostatic elements shall be of corrosion- resisting materials capable of long life without physical changes, such as cracking, softening, or stretching, at the maximum pressure and temperature required for the class. 3.3 Recovered materials. Unless otherwise specified herein, all equipment, materials
20、, and articles incorporated in the products covered by this specifica- tion shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which have been col
21、lected or recovered from solid waste and reprocessed to become a source of raw materials as opposed to virgin raw materials. that the use of used or rebuilt products is permitted under this specification. None of the above shall be interpreted to mean 3.4 Construction. Thermostatic elements and valv
22、e pins of the same design and manufacture for any given size of a class shall be interchangeable, without adjustment, in that size and class (see 6.3 and appendix). Thermosensitive valves, when placed in the trap bodies and with covers properly secured, shall be correctly positioned and distanced fr
23、om the valve seats (see 4.6.1). 3.4.1 Thermostatic elements (and strainers when provided). Traps shall be easily removed for examination and cleaning without breaking the inlet and outlet connections. Removal of the element while hot shall not result in distortion (of the element) that would affect
24、future operation. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4.2 End connections. End connoctloru of traps shall be union ends with silver-brazed tailpieces in accordance with HIL-F-1183. Trap inlet nPS ( inches ) 3.4.3 BaD confwation. Unles
25、s otherwise specified (see 6.2), traps shall be of the angle pattern with (side, inlet/bottom, outlet). Class I Class and working pressure ( lb/in2) A B C (5) (15) (25) 3.4.4 Class I traiis. Strainers as opeclfied for class II traps may be provided at the option of the manufacturer. F (50) 1,950 2,6
26、00 3,400 8,500 12,000 16,000 3.4.5 Clas s II traDg . Each class II steam trap shall be provided with a rugged strainer of ASTM, AISI, or Federal specification corrosion-resisting material. The strainer shall be integral with the trap inlet side, If possible, but it may be furnished in a separate fit
27、ting connected to the trap on the inlet side. G (100) 2,600 3,500 4,500 11,000 18,000 21,000 3.4.6 Valve ioim . Joints in the thermostatic valve element shall be mechanical, soldered, or a combination of both. Where solder is used for class I traps, it shall have a softening point of not less than 3
28、15F. used for class II traps, it shall have a softening point of not less than 425F. Where solder is 1 2 3 4 5 6 3.4.7 Val ve seatq. .Class II traps shall have renewable valve seats. 1/2 500 900 1,200 3/4 900 1,400 1,800 1 1,300 2,000 2,500 1 - 1/4 3,000 5,000 6,500 2 5,000 9,000 11,000 1 - 1/2 4,00
29、0 7,000 9,000 3.5 Jerformance. 3.5.1 Steam leaku . When exposed to saturated steam at working pressure, the thermostatic element shall cause the steam trap valve to close causing a major reduction in flow through the steam trap (see 4.6.3). 3.5.2 Pischaree caDacitv. Steam traps shall discharge the m
30、inimum continuous discharge capacities specified in table I (see 4.6.3) for the size, class, and working pressure specified. TABLE I. uve caDacitv (DOUndS of water Der ho ur). Size Class II Class and working pressure ( lb/in2) 1,200 1,800 2,500 6,500 9,000 11,000 1,550 2,200 2,900 7,500 10,000 14,00
31、0 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5.3 TemDerature differentials. Class I and class II traps in table I Class I traps shall function within the following temperature differentials. shall start discharging with a temperature differe
32、ntial (that is the difference between the temperature of the discharge water and that of the saturated steam of the same pressure as on the trap) of 10 to 25F. Class II traps shall start to discharge at a temperature differential of 30 to 40F (see 4.6.3). 3.5.4 Hvdrostatic strength. Thermostatic tra
33、ps shall be hydrostatically tested to 150 percent of the maximum working pressure for the class of service to determine that trap bodies and covers are not porous. tested to a hydro (body) cold rating pressure of 37.5 lb/in2, and class II traps shall be tested to a hydro (body) cold rating pressure
34、of 150 lb/in2 (see 4.6.4). Hydrostatic testing of class I and class II traps shall be conducted without thermostatic valves installed. Class I traps shall be 3.5.4.1 Pressure ratine. Thermostatic traps shall have a maximum allowable working pressure of 25 lb/in2 for class I and 100 lb/in2 for class
35、II. 3.6 Identification marking;. Each trap shall be marked legibly and permanently as specified below: (a) Manufacturers name or trademark (see 3.6.1). (b) Model number (see 3.6.1). (c) Pressure class number (for example CL. II - H.P.). 3.6.1 Manufacturers name or trademark and model decimation. The
36、 manufac- turers name or trademark and model designation shall be permanently and visibly marked on a nonoperating part. 3.7 Special tools. Steam traps shall not require special tools for instal- (Copies of this catalog may be consulted in lation and routine maintenance. Special tools are defined as
37、 those tools not listed in the Federal Supply Catalog. the office of the Defense Contract Administration Services Management Area (DCASMA) ) . 3.8 Exterior finish. Machined surfaces shall not exceed 125 roughness height rating (RHR) as defined in ANSI B46.1. When specified (see 6.2), castings shall
38、be nickel-plated internally and externally. 3.9 Workmanshiu. Components shall be free from defects which affect their appearance or which may affect their operation (see 4.6.1). clean, sound, smoothly cored, true to form, uniform in texture, and free from cold shunts, porosity, blow holes, and other
39、 injurious defects. Castings shall be thoroughly cleaned, both inside and outside, and all fins and roughness shall be removed. Castings shall be 4. QUALITY ASSURANCE PROVISIONS 4.1 ResDonsibiitv for insDection. Unless otherwise specified in the contract or purchase order, the contractor is responsi
40、ble for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-ZLLBC
41、 47 9999906 044bZ79 2 M MIL-T-2118C(SH) his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Govern- ment reserves the right to perform any of the inspections set forth in this specification where such
42、 inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 Responsibilitv for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspecti
43、on system or quality program (see 6.3). The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling i
44、nspection, as part of the manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.1.2 Test eaui
45、pment and inspection facilities, The matufacturer shall ensure that test and inspection facilities of sufficient accuracy, quality, and quantity are established and maintained to permit performance of required inspec- tions. 4.2 Classification of inspections. The inspection requirements specified he
46、rein are classified as follows: (a) First article inspection (see 4.4). (b) Quality conformance inspection (see 4.5). 4.3 Inspection. Unless otherwise specified (see 6.2), inspections shall be performed in accordance with the conditions specified in 4.3.1 through 4.3.2. 4.3.1 Test temperature. Inspe
47、ction and tests shall be accomplished at ambient room temperature unless otherwise specified. 4.3.2 Test fluid. Tests shall be conducted using saturated steam at the pressures identified in 3.5.4. 4.4 First article inspection. A first article test shall be conducted on the thermostatic element desig
48、n. simulated steam trap or an actual steam trap as long as the chamber dimensions where the element is mounted are equal. mance test of 4.6.3 and shall be caused to cycle at least 10 times. inspection of the element after this test shall show no signs of cracking, deformation or weakness of the elem
49、ent, or erosion of the seating element. The element may be installed in either a Inspection shall consist of the perfor- A visual 4.5 Quality conformance. Inspection shall be performed on sample units produced with equipment and procedures normally used in production. 45.1 Inspection lot. Traps of the same material, type, style, size, and class offered for delivery at the same time are considered to be a lot. E 4.5.2 SamDline;. A random sample shall be selected from each
