1、MIL-T-Sb0E Li7 = SS9990b 0270323 O - MIL-T-960E (SHIPS) 21 June 1963 SUPERSEDING MIL-T-B6OD(SHIPS) 8 September 1958 MILITARY SPECIFICATION TRAPS, STEAM, INTERMITTENT DISCHARGE AND CONTINUOUS FLOW, NAVAL SHIPBOARD 1. SCOPE 1.1 Scope.- This specification covers steam traps for use in draining condensa
2、te from steam systems. 1.2 - Classification.- Sream traps shall be of the following types and series, as specified (see 6.1): Type I Type II Type III Series 100 Series 150 Series 300 Series 400 Series 600 Series 1500 - Fluid level actuated (open bucket, inverted bucket, or ball float). - Pulsating e
3、lement or bimetallic. - Continuous discharge, no moving parts. - Bronze body traps; up to and including 100 pounds per square inch .s.i.) working - Steel body traps; from 101 to 150 p.s.i., inclusive, working pressure, 500F. maximum - From 151 to 300 p.s.i., inclusive, working pressure; 775F. maximu
4、m temperature. - From 301 to 400 p.s.i., inclusive, working pressure; 775F. maximum temperature. - From 401 to 600 p.s.i., inclusive, working pressure at 975F. - From 601 to 1500 p.s.i., inclusive, working pressure at 975F. pressure, 425 degrees Fahrenheit (“F.) maximum temperature. temperature. 2.
5、APPLICABLE DOCUMENTS 2.1 The following documents 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 herein. SPECIFICATIONS FEDERAL QQ-N-281 QQ-S-763 QQ-S-766 - Nickel-Copper Alloy (Monel and R-Monel), Bars, Plates,
6、Rods, Sheets, Strips, - Steel Bars, Shapes and Forgings - Corrosion Resisting. - Steel Plates, Sheets, and Strip Corrosion Resisting. Wire, Forgings and Structural and Special Shaped Sections. MILITARY MIL-B-857 MIL-D-963 MIL- F-1183 MIL-S-1222 MIL-S-2953 MIL-R- 17 13 1 MIL-F-20042 MIL-G-21032 - Bol
7、ts, Nuts and Studs. - Drawings, Electrical, Hull and Mech - Fittings, Tube Cast, Bronze, Silver - Studs, Continuous Thread (Bolt Stud. Round - High Temperature. - Strainers, Steam (for Small Branch Lines). - Rods, Welding, Surfacing. - Flanges, Pipe, Bronze (Silver Brazing). - Gaskets, Metallic - As
8、bestos, Spiral Wound (for ASA Commercial Flanged cal Equipment for Naval Shipboard Use. and Steel Bars, Joints in Piping Systems) (Identification Symbol 2410). STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes. DRAWINGS BUREAU OF SHIPS B-104 - Flanged Compo
9、sition, Pipe Fittings, 100 Pounds. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-SbOE 47 997770b 0270124 2 D MIL-T-QWE (SHIPS) PUBLICATIONS ! BUREAU OF SHIPS NAVSHIPS 250-692-13 - Radiographic Standards for Steel Castings. (Copies of specific
10、ations, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contract- ing officer .) 2.2 Other publications.- The following documents form a part of this specification to th
11、e extent specified herein. tIniess otherwise indicated, the issue in effect on they shall also operate satisfactorily when supported on a moving platform rolled up to 17-1/2 degrees in any direction from the normal horizontal. 3.6 Rated discharge capacity.- The rated discharge capacity shall be mark
12、ed on a permanently attached marking tag to indicate the capacity for the trap and the orifice furnished therewith (see 3.10). 3.6.1 Method of rating trap capacity.- Based upon the continuous discharge capacities of the trap at a temperature depression of lo“, 20“ and 30F. as determined by the labor
13、atory or by laboratory confirmed data submitted by the exhibitor, the trap shall be rated as follows: The rated discharge capacity shall be se- lected as the continuous discharge capacity at the highest pressure in the series, and, for 1/2 inch traps shall meet the minimum requirements specified in
14、table IV. Table IV - Minimum requirements for continuous discharge capacities of 1/2 inch traps at specified temperature depressions with constant back pressure of 30 p.s.i. Minimum capacity pounds per hour 10F. depression 1 20F. depression I 30F. depression 1 Trap 1 Inlet series pressure Type I LOO
15、 100 800 900 lo00 150 150 800 900 1000 300 300 800 900 1000 400 400 1400 1500 1600 soo0 600 600 2600 2800 L i 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-9bOE LI7-W 9999906 0230328 T .li MIL-T-SeOE(SFXIR3) Table IV - Minimum requirement8
16、for continuou8 discharge capcicities of l/Z inch traps at epecie temperoture depreseions with constant back pressure of 50 p.5. (Contd) Minimum capacity pounds per hour Trap Inlet series pressure 30F. depression 10F. depression 20F. depression Typen 100 100 1000 1100 1300 150 150 lo00 1100 1300 soo
17、300 lo00 1100 1300 400 400 1000 1100 1300 800 800 1000 1100 1300 1500 1400 2000 2500 3000 3.7 Steam loss.- Traps shall be designed to have a minimum loss or leakage of steam. When supplied with dry steam at the highest pressure for the trap seres, the trap shall not pass more than 20 pounds of steam
18、 per hour. 3.8 Detail requirements.- 3.8.1 Type I traps.- 3.8.1.1 Series.- Open bucket and inverted bucket traps may be furnished in all series. Ball float traps . shall be furnwm series 100 and 150 only. trap. 3.8.1.2 Air cock.- Ball float traps shall be fitted with an air cock for testing and to v
19、ent air from the 3.8.2 Types II and HI traps.- Types II and l traps may be furnished in all series. 3.9 Drawings.- Drawings shall be furnished in accordance with type I of MIL-D-963. 3.10 Markings.- Each trap shall be stamped or otherwise permanently marked with the following infor- mation in a mann
20、er which will not impair the serviceability of the trap: The data may be on a plate which shall be permanently secured to the trap body except for the direction of flow and body material, which shall be marked on the body directly. (a) The i.p.8. of the inlet and outlet connections. ) Direction of f
21、low (on the trap body). (c) The specification number, type and series - example: “Specification MIL-T-960, type II, series 600.“ (d) The name of the manufacturer. (e) Material of body (on the trap body). (f) Capacity at highest pressure in the series at a temperature depression of 30F (see 3.6). (g)
22、 Replacement seats or orifices shall be labeled to specify trap size and series. 3.11 Workmanship.- Workmanship shall be first class in all respects. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection.- Unless otherwise specified in the contract or purchase order, the supplier is resp
23、onsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the s
24、pecifica- tion where such inspections are deemed necessary to assure supplies and services conform to prescribed requirement s. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-SbOE 47 9999906 0270329 L MIL-T-960E (SHIPS) 4.2 Qualification te
25、sts1.- Qualification tests shall be conducted at a laboratory satisfactory to theBureau of Ships. Qualification tests shall consist of the tests specified in 4.2.1. 4.2.1 Sample traps for qualification tests (types I and II only).- Sample traps (types I and II only) shall be submitted as follows for
26、 the tests specified in 4.2.2 through 4.2.8: (a) One 1/2 inch size trap of each type and series for which qualification is being sought. (b) One trap of another size in the type offered for qualification approval shall be furnished for the , test specified in 4.2.4 for confirmation of the flow capac
27、ities. Bureau of Ships with each sample trap submitted for qualification as specified in 4.2.1: 4.2.1.1 Additional information to be submitted.- The following information shall also be submitted to the (a) The type of trap for which qualification is being sought. (b) Actual flow data for the traps c
28、overing the lowest and highest pressure in the range for each series. The flow capacities shall be conducted with water at a temperature of 30 degrees below the saturation. The flow data shall cover each size and orifice being considered for qualification for the pressure concerned. (c) A descriptio
29、n of the test set-up by which the data specified herein was obtained. (d) Three copies of the drawings specified in 3.9 for verification and certification of the tests per- formed. One certified copy of the drawings shall be furnished the Government inspector and shall be retained for use in checkin
30、g traps submitted for inspection, one copy shall be furnished the Bureau of Ships, and one copy to the laboratory. 4.2.1.2 Traps of the 1/2 inch size of the type and series which have successfully passed the qualification tests specified herein will qualify all other sizes and series of the same typ
31、e. 4.2.2 Operational test.- Operational test shall be conducted with flow of steam and hot water at various rates described below. The ability of the trap to function automatically and regularly at pressures and flow rates throughout the range indicated for the trap series shall be observed. Back pr
32、essures of 15 and 30 pai. shall be maintained throughout the test. The quantity of hot water in the steam shall be gradually increased until condensate backs up in the drop leg to the trap to a height of 30 inches above the trap. The capacity measured under this condition shall meet the minimum requ
33、irements specified in table V. The quantity Of water in the steam shall then be decreased and increased at varying rates with the height of condensate not to exceed 30 inches above the trap. The trap shall operate continuously under these varying conditions for 24 hours without malfunctioning. Table
34、 V - Minimum capacity requirements under operational test conditions of 1/2 inch traps with 30 p.s.i. back pressure. Level of water in drop leg before trap-30 inches. Trap Inlet pressure Minimum capacity series p.s.i. pounds per hour r Type1 100 100 600 150 150 800 300 300 600 400 400 600 600 600 10
35、0 Type II 300 300 180 400 400 600 300 1500 1400 350 lApplication for Qualification tests shall be made in accordance with “Provisions Governing Qualification“ (see 6.2 and 6.3). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-SbOE 47 m 777770
36、b 0210130 m MIL-T-96OE(SHIPS) 4.2.3 Steam leakage (measured).- Each sample trap shall be tested to insure that steam leakage past the trxp does not exceed 20 pounds per hour. The test shall be conducted at the highest pressure denoted by the trap series with dry steam at saturated temperature and wi
37、th 5“ and 10F. superheated steam being supplied to the trap. During the test a 30 p.s.i. back pressure shall be maintained in the discharge line for the series 150 traps and above. The steam leakage past the trap shall be condensed and weighed. water temperature of lo, 20“ and 30F. below the saturat
38、ion temperature corresponding to the water pres- sure. During the test, the water pressure and temperature conditions shall be maintained constant and a 30 p.8.i. back pressure shall be maintained in the discharge line for the series 150 traps and above. Capacities shall be determined at the lowest
39、pressure and highest pressure in the trap series as well as any intermediate pressures required by the laboratory (for series 100, the lowest pressure shall be 50 p.s.i.). The tilt test shall be conducted while the trap is operating at pressure within its series when permanently in- clined as follow
40、s: 4.2.4 Flow capacity test.- The continuous discharge flow capacity of traps shall be determined at a 4.2.5 Tilt tests.- Tilt tests shall be conducted at the discretion of the Bureau of Ships or laboratory. (a) 15 degrees to either side ) 15 degrees up or down from the normal horizontal positon of
41、the centerline of the end connec- tions. Observation shall be made to determine if the steam leakage conforms to the requirements specified in 3.5 and the ability o the trap to function properly. 4.2.6 Hydrostatic test.- Prior to and after completion of the tilt test, (see 4.2.5) the trap shall be t
42、ested hydrostatically for strength and porosity to the applicable test pressure specified in table VI and examined for visible distortion or porosity. Table VI - Hydrostatic test pressures. Series 400 600 1500 Hydrostatic test pressure 200 300 600 800 1500 3750 4.2.7 Examination after 24 hour operat
43、ional test.- At the conclusion of the test specified in 4.2.2, the trap shall be disassembled and all parts examined for signs of wear, weakness or potential failure of function. 4.2.8 One year life test.- At the conclusion of all tests specified in 4.2.2 through 4.2.7, a one year life test for seri
44、es 600 and 1500 traps shall be conducted. During the life test, a 30 p.s.i. back pressure shall be maintained in the discharge line of the trap. Periodic performance checks of the trap shall be made through- out the life test to determine that the trap continues to function properly. 4.3 Comparison
45、inspection.- At least once every two years or at any time when, in the inspectors opin- ion, the quality is not being maintained, one trap of the type(s) for which qualification approval was granted shall be selected and forwarded to a laboratory satisfactory to the Bureau of Ships for comparison in
46、spection for all the tests specified herein, deemed necessary by the inspector. If any sample trap fails in any test, the Bureau of Ships shall be notified so that corrective action may be taken on the Qualified Products List. 4.4 Sampling for quality conformance inspection.- 4.4.1 m.- All steam tra
47、ps of the same type, series and size presented for delivery at one time shall be considered a lot. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-Sb0E Y7 - 999990b 0270333 T m MIL-T-960E (SHIPS) 4.4.2 Sampling for visual and dimensional exam
48、ination and for hydrostatic :est.- A random sample of traps shall be selected f-m each lot for the visual and dimenciona! examination Specified in 4.5.1 and the hy- drostatic test specified in 4.5.2 to determine conformance to the requirements Specified herein with quality conformance based on the s
49、ampling requirements of MIL-STD-105 at inspertim level III. The acceptable quality level is 1.5 percent defective. Any trap in the sample containing one or more visual or dimensional defects or failing to pass the hydrostatic test shall be rejected and ii the number of defective traps in any sample exceeds the acceptance number for that sample, the lot represented by the sample shall be rejected. . 4.5 Examination and tests.- 4.5.1 Visual and dimensional
