1、INCH - POUND MIL-PRF-32207 10 October 2006 PERFORMANCE SPECIFICATION PROPELLANT, METHANE This specification is approved for use by all Departments and Agencies of the Department of Defense. Comments, suggestions, or questions on this document should be addressed to DET 3, WR-ALC/AFTT, 2430 C Street,
2、 Bldg 70, Area B, Wright-Patterson AFB OH 45433-7632 or e-mailed to AFPET.AFTTwpafb.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 9135 DISTRIBUTION STATEMENT A.
3、 Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32207 1. SCOPE 1.1 Scope. This specification covers two types and three grades of propellant methane. 1.2 Classification. The propellant
4、methane will be of the following designated types and grades: Types I Gaseous II Liquid Grades A 98.7% purity B 99.9% purity C 99.97% purity 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in 3, 4, or 5 of this specification. This section does not include docu
5、ments cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or
6、5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these docume
7、nts are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-27401 Propellant, Pressurizing Agent, Nitrogen MIL-PRF-27407 Propellant, Pressurizing Agent, Helium Copies of this document are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist
8、.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Bldg 4D, Philadelphia PA 19111-5094.) 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32207 2.3 Non-government publications. The following documents form a pa
9、rt of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS, INC. (ASTM) ASTM D 1945 Standard Test Method for Analysis of Natural Gas by Gas Chromatography AS
10、TM D 6667 Standard Test Method for Determination of Total Volatile Sulfur in Gaseous Hydrocarbons and Liquefied Petroleum Gases by Ultraviolet Fluorescence ASTM E 29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications (DoD Adopted) ASTM F 307 Stan
11、dard Practice for Sampling Pressurized Gas for Gas Analysis (DoD Adopted) ASTM F 310 Standard Practice for Sampling Cryogenic Aerospace Fluids (DoD Adopted) (Copies of these documents are available online at http:/www.astm.org or from the American Society for Testing and Materials, 100 Barr Harbor D
12、rive, West Conshohocken PA 19428-2959) 2.4 Order of precedence. In the event of a conflict between the text of 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 ex
13、emption has been obtained. 3. REQUIREMENTS 3.1 Chemical and physical properties. The chemical and physical properties of the propellant shall conform to those listed in Table I when tested in accordance with applicable test methods. 3.2 Qualitative (Type II only). The propellant shall be a clear, co
14、lorless, homogenous liquid with no solid particles when examined visually by transmitted light at the normal boiling point. 3.3 Limiting values. For purposes of determining conformance with these requirements, an observed value or a calculated value shall be rounded off “to the nearest unit” in the
15、last right-hand digit used in expressing the specified limit. This rounding off shall be done in accordance with the rounding-off method of ASTM E 29 (Using Significant Digits in Test Data to Determine Conformance with Specifications). 3.4 Filter. Unless otherwise specified by the contract or purcha
16、se order, a filter with no more than a 10-micrometer nominal and 40-micrometer absolute rating shall be installed between the manufacturers plant system and the manifold used to fill the gas or liquid containers for delivery. 3Provided by IHSNot for ResaleNo reproduction or networking permitted with
17、out license from IHS-,-,-MIL-PRF-32207 TABLE I. Chemical and physical properties. Grade Property A B C Test Paragraph Purity (CH4), % Vol, min 98.7 99.9 99.974.5.2 Water, ppmV, max 1 0.5 0.5 4.5.3 Oxygen, ppmV, max 1 1 1 4.5.4 Nitrogen, ppmV, max 5000 100 100 4.5.4 Carbon dioxide, ppmV, max 125 50 5
18、0 4.5.4 Other gaseous impurities, ppmV, max (i.e. Ar, H2, He, Ne) 5000 125 125 4.5.5 Ethane (C2H6), ppmV, max 5000 500 100 4.5.4 Propane (C3H8), ppmV, max 3000 500 100 4.5.4 Other volatile hydrocarbons, ppmV, max 1 1 1 4.5.6 Total volatile sulfur, ppmV, max 1 0.1 0.1 4.5.7 Non-volatile residue (NVR)
19、 Type II (liquid) product shall be sampled in accordance with ASTM F 310. All apparatus used shall be made of suitable materials. Each sample taken for analysis shall be representative of the product being sampled. (NOTE: For Type I (gaseous), a representative sample may also be obtained by withdraw
20、ing a sample from the sampling port on the shipping container directly into the analytical instruments). 4.3.4 Cylinders. Unless otherwise specified in the contract or purchase order, each filled cylinder (pressure and Dewar types) offered for shipment shall constitute a lot and be sampled for analy
21、sis. 4.3.5 Bulk conveyance. For bulk shipments, each filled container shall constitute a lot. Each individual tube on a tube-bank trailer is considered a separate container. A sample for analysis shall be taken from each portable tank, cargo tank, tank car, or tube filled with Type I (gaseous) or Ty
22、pe II (liquid) methane. 4.4 Rejection and retest. When any sample of the product tested in accordance with 4.2 fails to conform to the requirements specified herein, the entire lot represented by the sample shall be rejected. Rejected material shall not be resubmitted without furnishing full particu
23、lars concerning previous rejection and measures taken to overcome defects. 4.5 Test methods. The samples shall be analyzed according to the procedures described below. 4.5.1 Examination of product. (Type II only) Product shall be visually inspected during the NVR and particulate determination descri
24、bed in 4.5.8 to verify conformance with this specification (see 3.2). 4.5.2 Purity. The propellant methane content of the sample shall be calculated by the following formula: 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32207 =10000100%4i
25、CCH where, = purity (%Vol). 4%CH iC = the sum of all impurity species (ppmV). NOTE: Non-volatile residue (NVR) and particulates are not included in the purity calculation. 4.5.3 Water. The water content of the sample shall be determined by one of the following methods. In case of dispute, the electr
26、olytic method in 4.5.3.1 shall be used as the referee. 4.5.3.1 Electrolytic method. Connect the sample container to a pressure regulator which is attached to the electrolytic moisture apparatus (hygrometer). Open the sample container valve and adjust the pressure to the apparatus in accordance with
27、manufacturers recommended value. Allow sufficient time for the indicated moisture content to become stable and read the value obtained while using the most sensitive scale setting possible for the moisture content of the sample. The electrolytic moisture apparatus should be set on a range no greater
28、 than ten times the specified maximum moisture content. 4.5.3.2 Piezoelectric method. Determine the moisture content utilizing a piezoelectric sorption hygrometer that is set on a range no greater than ten times the specified maximum moisture content by following the instrument manufacturers instruc
29、tions. 4.5.3.3 Aluminum oxide method. Determine the moisture content utilizing an aluminum oxide capacitor-equipped analyzer set on a range no greater than ten times the specified maximum moisture content by following the instrument manufacturers instructions. 4.5.4 Gaseous impurities. Oxygen, nitro
30、gen, carbon dioxide, ethane and propane shall be determined by the gas chromatographic method described in 4.5.4.1. The carbon dioxide content of the sample may also be determined by the procedure described in 4.5.4.2. The oxygen content may be determined by the procedure described in 4.5.4.3. In ca
31、se of dispute the gas chromatographic method in 4.5.4.1 shall be used as the referee. 4.5.4.1 Gas chromatograph. Determine the gaseous impurities of the sample with a gas chromatograph in accordance with ASTM D 1945. The analyzer shall be capable of separating the compound with a sensitivity of 0.5
32、ppm or 20% of the specified maximum concentration of the component, whichever is greater. Appropriate impurity concentration techniques may be used to attain the sensitivity. The analyzer shall be calibrated at appropriate intervals by the use of calibration gas standards which contain the applicabl
33、e limiting characteristic gaseous components in methane. 4.5.4.2 Infrared analyzer. The carbon dioxide content of the sample may be determined with a gas cell equipped dispersive or non-dispersive infrared analyzer. The analyzer shall be calibrated at appropriate intervals with carbon dioxide in met
34、hane standards at approximately 14.95 microns 6Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32207 (669 cm-1). The sensitivity of the analyzer shall be at least 10 ppm or 10 percent of the specified maximum carbon dioxide content, whichever
35、 is greater. 4.5.4.3 Oxygen analyzer. The oxygen content of the sample may be determined with an electrolytic oxygen analyzer that is set on a range no greater than ten times the specified maximum oxygen content by following the manufacturers instructions. 4.5.5 Other gaseous impurities. Calculate t
36、he total content of other gaseous impurities of the sample by summing the amount of the following individual components in the sample as determined utilizing the procedure(s) of 4.5.4. Argon (Ar) Helium (He) Hydrogen (H2) Neon (Ne) 4.5.6 Other volatile hydrocarbons. The total volatile hydrocarbon co
37、ntent of the sample, excluding ethane and propane shall be determined utilizing a gas chromatograph with a flame ionization detector. 4.5.7 Total volatile sulfur. The total volatile sulfur content shall be determined in accordance with ASTM D 6667 in which the sulfur compounds are reacted to form a
38、compound which is subsequently measured by UV fluorescence. The analyzer shall be calibrated at appropriate intervals by the use of calibration gas standards. The range of the analyzer shall be no greater than ten times the specified maximum total sulfur content 4.5.8 Non-volatile residue & particul
39、ates. (Type II only) Thoroughly clean a 125 mL Erlenmeyer flask. Dry the flask in an oven at 105 5C for 30 minutes. After drying, cover the flask with a watch glass or inverted small beaker and allow it to cool next to the balance for 30 minutes. Weigh the flask to the nearest 0.01 mg. Place the fla
40、sk in a gas purged container that holds the flask securely but allows gas to be purged around the outside of the flask to avoid moisture condensation (see figure 1). Initiate a flow of nitrogen gas conforming to MIL-PRF-27401 (Grade B or C) or helium conforming to MIL-PRF-27407 (Grade A or B) throug
41、h the purged container to minimize condensation on the outside of the flask. Fill the flask to the 100 mL line with the liquid methane sample and start a flow of the nitrogen or helium into the flask to help evaporate the sample and prevent condensation in the flask. Adjust flows as needed to preven
42、t condensation and continue purging until the methane has evaporated and the flask is back to ambient temperature. Shut off gas flows. Remove the flask from the gas purged container, cover with the watch glass or small beaker and place it next to the balance for 30 minutes. Weigh the flask to the ne
43、arest 0.01 mg. For Grades B and C, more than 100 mL may need to be evaporated to reduce the effect of balance uncertainty on the result. (NOTE: Sampling should be performed either with the use of a Dewar or directly from the shipping container). 4.5.8.1 Calculation. The non-volatile residue and part
44、iculates will be calculated using the following formula: ()stgVWWLmgesparticulatNVR=/& 7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32207 Where: Wg= Gross weight of flask (mg) Wt= Tare weight of flask (mg) Vs= Volume of sample (L) Figure
45、1: NVR Apparatus 4.6 Container. For purposes of this paragraph, a container is defined as an individual cylinder, an individual tube in a tube bank trailer, or multiple cylinders that are interconnected by a single manifold that equalizes the pressure across all cylinders. 4.6.1 Filling pressure. Co
46、ntainers shall be tested for proper filling pressure by attaching a calibrated Bourdon-tube gauge or equivalent to the valve outlet and by attaching either a thermocouple or thermometer to the container wall. The gauge shall have scale divisions no greater than 10 psi for service pressures of less t
47、han or equal to 3000 psig, and no greater than 15 psi for service pressures greater than 3000 psig. If a thermometer is used, tape or putty shall be applied to the bulb to protect it from extraneous temperatures. Putty shall not be applied between the bulb and the cylinder wall. The thermometer shal
48、l have scale divisions no greater than 2F (1C). The containers shall be stabilized to ambient temperature. Then the valve shall be opened and the internal pressure observed on the gauge. 4.6.2 Leakage. Each container shall be tested for leaks at the neck threads, stem packing, and safety device of t
49、he valve with leak-detection fluid. Valve seat leakage shall be tested by means of a tube from the valve outlet to a container of liquid. 5. PACKAGING. 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD or in-house 8Provided by IHSNot for Resale
