1、MIL-H-24146 2 June 1965 , MILITARY SPECIFICATION HEADS, SPRINKLER, FIRE PROTECTION, FOAM WATER This specification is mandatory for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. - This specification covers foam-water fire extinguishing sprinkler heads for uprig
2、ht or pendant installation in overhead sprinkler systems. 2, 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 speci- fied herein: . SPECIFICATIONS . FEDERAL QQ-B-613 QQ- B- 6
3、2 6 QQ-B-639 QQ-S-781. . PPP-B-566 PPP-B-601 PP P- B- 62 1 PPP-B-636 PPP-B-640 PPP-B- 665 PPP-B- 67 6 MILITARY Brass, Leaded and Non-Leaded; Flat Products (Plate, Bar, Sheet, and Strip). Brass, .Leaded and Non-Leaded: Rod, Shapes, Forgings and Flat Products with Finished Edges (Bar, Flat Wire, and S
4、trip). Brass, Naval: (Flat Products) Plate, Bar, Sheet and Strip. Steel Strapping, Flat. - - Boxes, Folding, Paperboard. Boxes, Wood, Cleated-Plywood Boxes, Wood, Nailed and Lock-Corner Boxes, Fiberboard Boxes, Fiberboard, Corrugated, Triple Wall Boxes, Paperboard, Metal Stayed (Including Stay Mater
5、ial). Boxes, Set-up, Paperboard MIL-P-116 Preservation, Methods of . MIL-S-901 Shock Test, H. I. (High Impact); Shipboard Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- H-2 4146 MIL-B-16444 MIL - B- 16541 Bronze, Hydraulic (Ounce Metal): Castin
6、gs. Bronze, Valve: Castings. STANDARDS MILITARY MIL-STD-105 MIL-STD-129 Sampling Procedures and Tables for Inspection by attributes. Marking for Shipment and Storage (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functio
7、ns should be obtained from the procuring activity or as directed by the contracting officer. ) 2.2 Other publications, - The following document forms a part of this speci- fication to the extent specified herein, Unless otherwise indicated, the issue in effect on date of invitation for bids or reque
8、st for proposal shall apply, OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules. (Application for copies should be addressed to the Official Classification Committee, 1 Park Avenue at 33rd Street, New York, N. Y. 10016.) 3. REQUIREMENTS 3.1 Preproduction sample. - Prior to beginn
9、ing production four samples shall be inspected as specified in 4.4 and 4.5 (see 6.4). 3.2 Material. - Sprinkler head bodies shall be made of bronze conforming to QQ-B-626, MIL-B-16444 or MIL-B-16541. Deflector plates and other fabri- cated parts shall be Naval brass conforming to QQ-B-639 or QQ-B-61
10、3. Support- ing arms shall be of corresponding or other suitable materials resistant to corrosion and high temperature. 3.3. Construction. - The foam-water sprinkler shall have a single, open orifice and a deflector plate firmly supported. The deflector plate shall be supported by one cross yoke of
11、5/32-inch maximum thickness designed to produce a homogeneous conical spray which will not impinge on the overhead. The body shall be designed to introduce and mix air into foam-liquid solution in order to pro- duce foam (see 6.2.2). Unless otherwise specified (see 6. l), the sprinkler head shall in
12、corporate a 1/2-inch National Pipe Threads (NPT) male threaded inlet for installation in galvanized steel fittings. wrench to be used during installation. ler shall be 6-1/2 inches; the maximum width or diameter shall be 2-1/4 inchss. The orifice shall be greater than 1/4 inch diameter. Flat surface
13、s shall be pruvided for a The maximum overall length of the sprink- 3.3.1 Shock and vibration. - Sprinkler heads shall be designed for shock arad vibration, 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-2414b 42 m 77777Ob 0232b37 T m MIL-H-
14、24146 3,4 Drawings. - . 3-4.1 Detail assembly drawings, - The contractor shall submit class A drawings in accordance with MIL-D-963. These drawings shall be certified dimensional drawings of a sprinkler head which has passed the qualification test. All sprinkler heads shall- be manufactured in accor
15、dance with these drawings. 3.5 Marking. - 3.5,l Body marking. - Each sprinkler head shall be clearly marked with the manufacturers name or trade mark, the manufacturers number and the number of this specification. 3. 6 Workmanship. - 3,6.1 All sprinkler heads shall be sound, smoothly cored, true to
16、form, uniform in texture, and free from cold shunts, porosity, or any other defects which may affect their serviceability. They shall be thoroughly cleaned, both inside and outside, and all fins and roughness shall be removed. - 3.6.2 Castings-shall notbe repaired, plugged, or welded without permiss
17、ion from the inspector, which shall be given only when the defects are small (less than 10 percent of a size which would be cause for rejection of the heads) and do not adversely affect the strength, use, or machinability of the castings. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspec
18、tion. - Unless otherwise specified in the con- tract or purchase order, the supplier is responsible 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 rhvern
19、ment, inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The Government reserves the right to perform any of the - - 4.2 Preproduction inspection, - Preproduction inspection shall consist or the e
20、xamination and tests specified in 4.4 and 4.5. 4,3 Sampling. - 4.3.1 .Lot. - All sprinkler heads offered for delivery at one time shall be considered a lot. 4.3.2 Sampling for visual and dimensional examination. - A random sample of sprinkler heads shall be selected from each lot offered f0.r examin
21、ationof visual and dimensional characteristics in accordance with MIL-STD- 105, at Inspection Level II and shall be examined ;ts specified in 4.4. shall be 1.5 percent defective. . The Acceptable Quality Level 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
22、m IHS-,-,-MIL-H-2414b Li2 7777706 0232b40 b MIL-H-24146 4.4 Visual and dimensional examination. - Each of the sample sprinkler ha the drainage pan, a metal pan at least 9 inches in diameter and about 1 inch high, shall be used to collect the liquid draining during the weighing operation, Prior to te
23、st, (a) the total weight (W1) of the sieve plus drainage pan shall be determined, (b) the weight of the receiving pan (W3) shall be determined and (c) the drainage pan shall be positioned on the labora- tory balance and the balance weights then set to indicate the weight of the drain- age pan. Befor
24、e the foam-application, the sieve shall be wetted with water and then shaken to remove excess water. The sieve shall be nested in the receiving pan and both placed below the funnel. Foam generation shall be staeted and after . 4 Provided by IHSNot for ResaleNo reproduction or networking permitted wi
25、thout license from IHS-,-,-MIL-H-2113116 42 W 777770b 02326113 B W MIL-H-24146 steady flow has been obtained the sliding cover shall be removed. When the sieve has been filled with foam, flow to the sieve shall be cut off by means of moving the iunnel so that the aam shield covers the sieve. Timing
26、shall be started at this point. The sieve and the receiving pan sha.11 then be separated. The re- , ceiving pan shall be placed aside for later weighing, and the sieve shall be supported on a slope of 1 to 14 above the drainage pan which was previously positioned on the balance. in 10 gram increment
27、s and the times noted at which the beam balances. weighing shall continue until the total weight of the drained liquid, in the drainage and receiving pans, shall be at least 25 percent of the total weight of the foam sample. Calculate the total weight of the foam sample (W,) as follows: The sliding
28、weight of the balance shall be advanced The wF = p2 - wl) -t (w4w3) Where w1 = weight of sieve plus drainage pan, gms. W2 =weight of sieve with foam, plus drainage pan with drained liquid, gms. w3 = weight of receiving pan, gms. W4 = weight of receiving pan with drained liquid, gms. The total weight
29、 of the drained liquid is equal to the sums of the weights of the liquid .in the receiving pan and the drainage pan: The 25 percent drainage time (see 6.2.5) is the time required for drainage of a weight of liquid equal to 25 percent of the total weight of the foam sample (WF/). Calculate the 25 per
30、cent drainage time by interpolation of the weight-time data obtained, Calculate the expansion as follows : Expansion= V WF where: V = volume of foam sample collected in sieve = 1650 ml. With foam generated from a 6 percent premixed solution of the foam-forming liquid in fresh water at 68“ F. (20“ C.
31、 ) and 35 psig, the expansion of the foam shall be at least 5.5 and the 25 percent drainage time of the foam shall be at least 55 seconds. - 4.5,4 Fire test. - The sprinkIer heads shall be capable of extinguishing and controlling a gasoline fire as described in 4.5.4.1. 4.5.4.1 The tank used for the
32、 fire tests shall be of steel constkction Four heads shall be positioned in measuring 10-feet square by 3-feet deep, their intended installed position (see 6.1) in an overhead piping system so that the discharge from the head shall be 8 feet above the fuel surface. The heads shall be 8 feet apart, e
33、ach head above and adjacent to a tank corner. One hundred gallons of commercial grade gasoline shall be floated on a sufficient quantity of water so that the fuel surface is 2 feet below the top edge of the tank. The fire shall be permitted to burn freely for 30 seconds before foam application. - -
34、5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-H-24L46 12 W 7777706 0232b42 T - MIL-H-24146 The foam shall be applied for 90 seconds. Record the periods after start of foam application as required for the foam to spread over the tank, for the
35、 fire to be extinguished except for licks of flame at the edges of the foam blanket, and for complete extinguishment, as “coverage“, “control“, and “extinguishment“, respectively. Foam from the sprinkler (using 6 percent kesh water solution at 35 psig) shall have a time of coverage of not more than
36、20 seconds, control in not more than 50 seconds and shall completely extinguish the fire in not more than 75 seconds. The foam blanket shall average not less than 2-1/2 inches in thickness after the 90-second period of application. The fire test shall be con- ducted when the wind velocity is below 5
37、 miles per hour, After completion of the tests described in 4.5.4.2 and 4.5.4.3, the pressure shall be increased to 100 psig and the test repeated. Extinguishment time shall not exceed 75 seconds, 4.5.4.2. Sealability. - A lighted torch shall be passed over the 9.0 second foam application of 4.5.4.1
38、 continuously for 15 minutes without touching or penetrating the foam. The. fam blanket shall prevent reignition of the fuel. 4,5.4.3 Burnback test, - Immediately after completion of the sealability test, an opening, 6 inches square, shall be made in the approximate center of the foam blanket and th
39、e exposed fuel shall be reignited with a torch, The re- ignited fire shall be permitted to burn for 5 minutes. After the 5-minute burning period, the burnback area shall be determined. The foam blanket shall prevent spread oi! the fire beyond an area approximately 20 inches square. 4.5.5 Heat tests.
40、 - 4.5.5.1 Quench test. - Two heads shall be placed in a furnace maintained at 900“ F, When the heads reach this temperature, one head shall be immediately quenched in water at 70“ F. and the other head shall be cooled in air to 70“ F. The head shall not be deformed when heated to 900“ F and quenche
41、d in water or air. 4.5.5.2 Destructive test. - The head shall be subjected to increasing temperatures in 100“ F. increments and held at each temperature for 15 minutes until failure occurs. At each temperature, the head shall be struck with a 1/8 inch diameter steel rod to determine its structural s
42、trength, not fail structurally when heated to 1500“ F. The head shall 4.5.6 Mechanical shock test, - Two. sprinklers, one as received, and 4ne water-quenched after heating to 900“ F shall be sufficiently rugged to withstand the following shock blows: Each head in turn shall be moiinted on an inkerna
43、lly threaded Soss welded to an angle section which shall be bolted to the mounting plate of the 2000 ft-lb sho first an interior examination, in process- of packaging,. and second an examination of containers fully prepared. for delivery. The sample unit for each of the two phases shall be one conta
44、iner prepared for delivery as specified herein. The inspection level shall be S-2 of MIL-STD-105, with an acceptable quality level (AQL) of 4. O defects per 100 units. Table I- Examination of preparation for delivery. Examine Marking (interior package or container and exterior container as applicabl
45、e) Ma ter ials Workmanship (as applicable) Contents (interior and exterior container as applicable) Weight (exterior container) Preservation (as applicable) Defects OmiCfd, incorrect, illegible, improper size, location, sequence or method of application. Component missing, damaged, defective or not
46、as specified. Inadequate or imporoper packaging or packing, such as closure of interior. packages, or containers, Closure of case liners or con- tainer flaps, taping of seams, corners, and manufacturers joints, closure of alternate containers; loose strapping or tape banding; inadequate stapling; bu
47、lging.or distortion of containers, Number per container not as specified. Weight per container exceeds maximum specified. Preservation missing, improperly applied or incorrect type. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H 24146 5. PREPA
48、RATION FOR DELIVERY 5.1 Preservation and packaging. - Preservation and packaging shall be Level A or C, as specified (see 6.1). 5.1,l Level A. - . 5.1.1.1 Unit packaging. - Unless otherwise specified (see 6. i), the sprink- ler heads shall be packaged method II of MIL-P-116. Each Sprinkler head shal
49、l be individually packaged in a snug-fitting box oonforming to PPP-B-566, PPP-B- 665, or PPP-B-676. Box closures shall be as specified in the applicable box specification or appendix thereto. 5.1.1.2 Intermediate packaging. - When specified (see 6. i), the sprinkler heads shall be packaged in intermediate containers conforming to PPP-B- 636, class domestic, and shall not exceed 20 pounds gross weight and 1.5 cubic feet in size. Intermediate container quanti
