1、Beneficial comments, recommendations, additions, deletions, etc., and data that may improve this document should be sent to: DLA, Land and Maritime, ATTN: VAI, P.O. Box 3990, Columbus, OH 43218-3990, or email to FluidFlowdla.mil. Since contact information can change, you may want to verify the curre
2、ncy of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 4940 COMMERCIAL ITEM DESCRIPTION SPRAY GUN, PAINT, HEAVY DUTY (SIPHON OR PRESSURE FEED) The General Services Administration has authorized the use of this commercial item description by all f
3、ederal agencies. 1. SCOPE. This commercial item description (CID) covers the general requirements for two types (siphon and pressure feed) of air operated, heavy-duty paint spray guns consisting of forged aluminum bodies, paint cups, and carrying cases. Spray guns covered by this CID are intended fo
4、r commercial/industrial applications. 2. CLASSIFICATION/PART OR IDENTIFICATION NUMBER (PIN). This CID uses a classification system which is included in the PIN as shown in the following example (see 7.1). AA50310 - S001 _ _ CID number Dash number 2.1 Type and size. Spray gun types and sizes are clas
5、sified as shown in table I. 2.1.1 Example of PIN: The PIN AA50310-S001 specifies a type S, siphon feed, size 001. TABLE I. Spray gun types and sizes Characteristics Type S (siphon feed) P (pressure feed) Size 001 Size 002 Size 001 Elliptical pattern 1.5 by 7 inches 2 by 8 inches 2 by 9 Round pattern
6、 1.5 inches 2 inches 2 inches Air pressure, psig 1/ 30-50 50-60 55-65 Fluid flow rate, oz./min. 7.25 or more 8 or more 14.5 or more Air flow rate, cfm 2/ 2.2 - 4.0 7.0 - 8.0 7.0 - 8.0 Viscosity, seconds 3/ up to 20 up to 30 25 - 30 1/ Pressure is in pounds per square inch gage (psig). 2/ Air flow is
7、 in cubic feet per minute (cfm). Note: The volume of air flow shall be corrected to 29.92 inches of mercury, standard barometric pressure, at +70 F. 3/ Timed measurements of paint viscosity using a Number 2 Zahn cup at 77 5 F for type S, and a Number 4 Ford cup at the same temperature for type P. IN
8、CH-POUND A-A-50310A 19 October 2011 SUPERSEDING A-A-50310 30 May 1990 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50310A 2 3. SALIENT CHARACTERISTICS. 3.1 Interface and physical dimensions. Spray guns supplied to this CID shall be as specifie
9、d herein. 3.2 Materials. Materials used for the spray gun shall be free from defects that would adversely affect the performance or maintainability of individual components or of the overall assembly. Materials not specified herein shall be of the same quality used for the intended purpose in best c
10、ommercial practices (see section 4). Suitable protection against galvanic corrosion shall be provided when dissimilar metals are used. 3.3 Design and construction. The spray gun shall be a complete functional assembly, consisting of a gun and a cup. The spray gun shall be new and of the manufacturer
11、s latest commercial design. The gun shall be designed for heavy-duty commercial and industrial production use. The spray gun shall be for hand-held operation and designed with an air pressure, fluid material atomizing and mixing cap. The type S gun shall be designed for siphon feed. The type P gun s
12、hall be designed for pressure feed. All valves used in either the type S or type P spray guns shall be replaceable. 3.3.1 Spray gun body. The spray gun body shall be an aluminum alloy drop forging with a hook provided at the top of the body (see figure 2). 3.3.2 Spray head. The spray head shall be b
13、rass or bronze and of the detachable type. The interior and exterior surfaces shall be smooth and finished with a chrome or nickel plating. 3.3.3 Air caps and fluid nozzles. Air caps and nozzles meeting the requirements of table I shall be provided with each spray gun. For type S, the air caps and n
14、ozzles shall be external mix siphon feed type. The spray gun shall be provided with all the hardware necessary to perform as either a type S size 001 or a size 002 spray gun. The conversion shall be accomplished by changing only the air cap. The necessary hardware shall be provided for the spray gun
15、 to perform as a type S or a type P spray gun. 3.3.4 Air cap. The air cap shall be fabricated from brass or bronze with smooth exterior and interior surfaces that are chrome or nickel plated. The air cap shall be self-centering on the nozzle and fitted to the spray gun head with a threaded retaining
16、 ring. 3.3.5 Nozzle. The nozzle shall be fabricated from stainless steel and shall have a Rockwell C hardness of 48-60. The nozzle shall be ground or lapped on all seating surfaces and air passages. 3.3.6 Siphon tube assembly (type S gun). The siphon tube assembly shall consist of the spray gun cup
17、lid, quick-release clamp, gasket, and siphon tube for delivering paint from the cup into the spray head. The assembly shall attach to the spray head with a 0.375 inch (9.53 mm) female national standard straight pipe thread mechanical (NPSM) with a 30 degree tapered seat. 3.3.7 Spray gun cup. A heavy
18、 duty, one-quart capacity cup shall be provided shall be provided with each spray gun. The cup shall have an aluminum alloy body with an external stainless steel or aluminum alloy reinforcement ring permanently attached to its bottom. The outside diameter of the cup shall be not more than 4.625 inch
19、es (117.48 mm) and the smallest throat diameter shall be not less than 3.25 inches (82.55 mm). The material wall thickness of the cup shall be no less than 0.040 inches (1.02 mm). The cup interior shall have a 63 microinch (1.6 microns) (XXX mm) or finer arithmetic average surface roughness, and sha
20、ll contain no burrs or slivers. 3.3.7.1 Type P spray gun cup. The type P spray gun, in addition to the material and dimensional requirements of 3.3.7, shall have a cup lid that includes an air regulator adjustment, a fine air flow volume adjustment valve, and a pressure gage (air). A pop-off pressur
21、e safety relief valve, vented to atmosphere, shall be mounted on the gun cup lid or at the base of the gun handle. The air regulator shall be capable of regulating within 5 psig the air pressure inside the cup at any point within the full-range scale of the air pressure gage. The cup shall be capabl
22、e of withstanding internal air pressure of 50 psig without a pressure drop of more than 2 psig during a two-minute period. The safety relief valve shall release pressure at not less than 50 psig and not more than 60 psig and shall reset itself when pressure is reduced below the valve release pressur
23、e. 3.3.8 Paint valve. The trigger-operated paint valve shall be a stainless steel needle valve. The valve shall be ground on all seating surfaces. The valve packing shall be chrome-treated leather, fiber, or synthetic material. Flow rate shall be adjustable. The paint valve shall be self-closing whe
24、n the trigger is released. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50310A 3 3.3.9 Air valve. The air valve shall be trigger-operated with a replaceable valve seat. The valve packing shall be chrome-treated leather, fiber, or synthetic mat
25、erial. The air valve shall be self-closing when the trigger is released. 3.3.10 Pattern control valve. An adjustable pattern control valve shall be provided to infinitely regulate the spray pattern from round to elliptical and vice versa. 3.3.11 Trigger. The trigger shall control both the air and pa
26、int valves and shall operate to permit air flow before paint flow. Releasing the trigger shall cause the paint valve to close before the air flow is stopped. The trigger material shall be corrosion-resistant metal or metal plated to resist corrosion. 3.3.12 Connections. The spray gun shall be provid
27、ed with paint and air connections. The paint inlet connection shall be a 0.375 inch (9.53 mm) National Pipe Straight Mechanical (NPSM) male thread with a thirty (30) degree internal tapered seat, and the connection for the air hose shall be a 0.250 inch (6.35 mm) male NPSM with a thirty (30) degree
28、internal tapered seat. The air hose fitting shall be detachable from the butt of the handle grip and shall be fabricated from drawn brass rod. 3.3.13 Air leakage. The valve packings and seals, when subjected to 100 psig pressure, shall allow no more than a 10 psig drop in one minute after pressure c
29、ut-off. 3.3.14 Hydrostatic pressure. The spray gun with the cup removed shall not be damaged and shall perform as specified herein after being subjected to a hydrostatic pressure of 250 psig minimum for a period of not less than one minute. 3.3.15 Durability. The spray gun and components shall not b
30、e damaged and shall perform as specified herein after being subjected to 10,000 full-stroke trigger actuations while under an air pressure of 60 psig. 3.4 Performance and product characteristics. The paint spray gun and all its components shall perform in accordance with the requirements specified h
31、erein and in table I. 3.4.1 Sprayable material. The spray gun shall be capable of spraying liquid materials such as enamels, lacquers, primers, shellacs, varnishes, polyurethanes, stains, paints, and the two-part aliphatic polyurethane coatings, thinned to a viscosity as specified in table I. 3.4.2
32、Sprayable material finish. The type S and type P guns, with the appropriate air cap and nozzle combinations, shall provide a coating finish equal to or better than the passenger car finishes provided by the major domestic automobile manufacturers when spraying black to charcoal color pigmented acryl
33、ic paint over a 3-foot by 3-foot square prepared metal surface. Viscosity shall conform to table I. 3.4.3 Spray pattern. The spray gun, in any configuration, shall produce symmetrical round and elliptical spray patterns (see figure 1) meeting the requirements of table I. The effective area of the sp
34、ray pattern is that area which has 100 percent paint coverage. The pattern shall be produced using a black to charcoal color alkyd gloss enamel exterior automotive paint thinned to the required viscosity for both type S and type P configurations in accordance with table I. The spray pattern shall be
35、 produced, without paint runs within the paint area, with the spray gun held stationary in a perpendicular position 7.5 (190.50 mm) to 8.5 inches (215.90 mm) from the sprayed surface, and the paint sprayed for not more than one second. The type P spray gun shall produce acceptable patterns on horizo
36、ntal, flat, non-porous surfaces positioned both below the spray gun and above the spray gun (overhead). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50310A 4 FIGURE 1. Acceptable spray patterns. 3.5 Impact resistance. The spray gun, with the c
37、up removed (the type S gun shall also have the siphon tube assembly removed) and the nozzle and connections protected, shall withstand being dropped 6 times through a free fall of 6 feet (minimum) to an unprotected concrete floor. There shall be no damage or deformation to the spray gun sufficient t
38、o degrade its performance. 3.6 Carrying case. The carrying case shall be made of high-density polyethylene plastic that meets the requirements of ASTM D4976 designation PE235. The carrying case shall be molded with custom contours to accommodate the spray gun, cup, and all hardware necessary for con
39、version from one size or type to the other. The carrying case shall consist of the top and bottom shells, handle, and clasps. 3.7 Marking. The spray guns supplied to this CID shall be marked with the manufacturers (MFRs) standard commercial PIN. 3.8 Metric products. Products manufactured to metric d
40、imensions will be considered on an equal basis with those manufactured using inch-pound units, provided they are within specified tolerances after conversion using tables in the latest revision of FED-STD-376, and all other requirements of this CID are met. 3.6 Recycled, recovered, or environmentall
41、y preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.7 Workmanship. Coupl
42、ing halves, cap and wye; quick disconnect pneumatic hose, two-lug universal type shall be processed in such a manner as to be uniform in quality and shall be free from other defects that will affect life, serviceability, or appearance. Round Pattern Elliptical Pattern Provided by IHSNot for ResaleNo
43、 reproduction or networking permitted without license from IHS-,-,-A-A-50310A 5 FIGURE 2. Pressure feed nozzle. 4. REGULATORY REQUIREMENTS. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with 23.403 of the Federal Acquisition Regulati
44、on (FAR). 5. PRODUCT CONFORMANCE PROVISIONS. 5.1 Product conformance. The products provided shall meet the salient characteristics of this CID, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercia
45、l market. The Government reserves the right to require proof of such conformance. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50310A 6 5.1.1 Pop-off pressure safety relief valve test. This test shall verify conformance to 3.3.7.1 and shall be
46、 performed on each spray gun offered for acceptance. An air pressure gage capable of measuring pressure in the gun cup shall be installed. The gage shall be accurate within one percent over the range of 45 to 65 psig and readable to the nearest psig. Starting with the air regulator adjusted to 40 ps
47、ig, adjust the regulator slowly upward, carefully observing the gage air pressure, until the pop-off pressure safety relief valve opens. The pressure release point shall be not less than 50 psig and not more than 60 psig. The valve shall reset itself upon reduction of pressure below the release poin
48、t. Failure of the relief valve to open in the range of 50 to 60 psig, or failure of the valve to reset itself shall be cause for rejection. 5.2 Market acceptance. The following market acceptance criteria are necessary to document the quality of the product to be provided under this CID: a. The compa
49、ny producing the item must have been producing a product meeting the requirements of this CID for at least 5 years. b. The company producing the item must have sold at least 25 units meeting this CID in the commercial marketplace over the past 2 years. 6. PACKAGING. Preservation, packing, and marking shall be as specified in the contract or order. 7. NOTES. 7.1 PIN. The PIN should be used for Government purposes to buy com
