1、1 INCH-POUND MIL-G-18997E(SH) w/ AMENDMENT 2 14 March 2006 SUPERSEDING MIL-G-18997E w/ AMENDMENT 1 1 June 1995 (See 6.9) MILITARY SPECIFICATION GAUGE, PRESSURE, DIAL INDICATING This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use b
2、y all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers environmentally hardened pressure gauges that utilize a mechanical elastic element to sense the pressure to provide an analog indication of the pressure on a circular dial or vertical scale, He
3、lical Edgeview Mechanical Pressure Indicator (HEMPI). Depending on case size and design, the pressure gauge may either be stem or flush/surface mounted. 1.2 Classification. Pressure gauges are classified according to the following variables (see 6.2): a. Design (see 1.2.1). b. Type of pressure (see
4、1.2.2). c. Dial size, case design (see 1.2.3). d. Elastic element material and style (see 1.2.4). e. Dial range and color (see 1.2.5). f. Pressure connection and connection location (see 1.2.6). g. Liquid fill case fluid and vibration category (see 1.2.7). h. Cleanliness (see 1.2.8). 1.2.1 Design. P
5、ressure gauge design is designated by one of the following symbols: Pressure gauge design Symbol Simplex S Simplex - special applications Caisson K Cruising range C Oxygen X Refrigerant R Duplex D Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G
6、-18997E(SH) 2 1.2.2 Type of pressure. Type of pressure that the pressure gauge indicates is designated by one of the following symbols: Type of pressure Symbol Gauge pressure G Vacuum V Compound C Suppressed, gauge pressure S Retarded, gauge pressure R Retarded, compound pressure T 1.2.3 Dial size a
7、nd case design. The dial size and case design is designated by one of the following symbols: Dial size Case design Symbol 2 Stem mounted 1 2 Stem mounted 2 3 Flush/surface mounted 3 4 Flush/surface mounted 4 8 Flush/surface mounted 8 1 (vertical scale) Flush H 1.2.4 Elastic element. The elastic elem
8、ent is designated by two symbols as provided below. The first symbol designates the elastic element material. The second symbol designates the elastic element style. Elastic element material Symbol K-monel MInconel I K-monel or Inconel (manufacturer option) N Elastic element style Symbol C-type bour
9、don tube (gear drive) C Helical (also helical-spiral) bourdon tube (gear drive) H Helical (also helical-spiral) bourdon tube (direct drive) D C-type bourdon tube (gear drive), helical bourdon tube (gear drive), or helical bourdon tube (direct drive) manufacturer option N 1.2.5 Dial range and color.
10、The range and color of the pressure gauge dial is designated by a sequence of symbols for the range followed by a single symbol for the color of the dial. The sequence of symbols for the range should be selected from the appropriate table in 3.3.10.4. Each HEMPI is furnished with two dials; one with
11、 white background and black markings (installed) and one with black background and white markings. The single symbol for the color of the dial is designated by one of the following symbols: Dial color Symbol Black background dial with white graduations and markings B White background dial with black
12、 graduations and markings W Special (see 6.2) S Vertical dials (HEMPI only) - white background with black markings and black background with white markings G Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-18997E(SH) 3 1.2.6 Pressure connection
13、 and connection location. The type of pressure connection and its location for connection is designated by two symbols as provided below. The first symbol designates the type of connection fitting. The second symbol designates the location of the pressure connection. Pressure connection Symbol O-rin
14、g union R NPT (male) P Welded nipple W Threaded vent (caisson only) K Flareless (bite type) 7/16-20 UNF-2A C 7/16-20 UNF-2B (HEMPI only) H Boundary gauge 7/16-20 UNF-2A B Connection location Symbol Back A Bottom O 5 oclock C 1.2.7 Liquid fill case fluid and vibration category. The option for the pre
15、ssure gauge case containing a liquid fill and the vibration category is designated by the two symbols as provided below. The first symbol designates whether a fill fluid is required (see 3.3.8). The second symbol designates the vibration category (see 4.4.9.1). Liquid fill Symbol None N Silicone S V
16、ibration category Symbol Category A A Category B B Categor C C 1.2.8 Cleanliness. Deleted. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this spe
17、cification 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 5 of this specification, whether or not t
18、hey 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 documents are those cited in the solicitation
19、or contract. FEDERAL SPECIFICATIONS QQ-N-281 - Nickel-Copper Alloy Bar, Rod, Plate, Sheet, Strip, Wire, Forgings, and Structural and Special Shaped Sections QQ-N-286 - Nickel-Copper-Aluminum Alloy, Wrought (UNS N05500) TT-P-645 - Primer, Paint, Zinc-Molybdate, Alkyd Type FEDERAL STANDARDS FED-STD-H2
20、8 - Screw-Thread Standards for Federal Services FED-STD-595 - Colors Used in Government Procurement Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-18997E(SH) 4 DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-901 - Shock Tests, H.I. (High-Impact) Sh
21、ipboard Machinery, Equipment, and Systems, Requirements for MIL-T-1368 - Tube and Pipe, Nickel-Copper Alloy, Seamless and Welded MIL-PRF-5425 - Plastic Sheet, Acrylic, Heat Resistant MIL-C-5541 - Chemical Conversion Coatings on Aluminum and Aluminum Alloys MIL-R-6855 - Rubber, Synthetic, Sheets, Str
22、ips, Molded or Extruded Shapes, General Specification for MIL-A-8625 - Anodic Coatings for Aluminum and Aluminum Alloys MIL-C-15726 - Copper-Nickel Alloy, Sheet, Plate, Strip, Bar, Rod and Wire MIL-T-16420 - Tube, Copper-Nickel Alloy, Seamless and Welded (Copper Alloy Numbers 715 and 706) MIL-PRF-24
23、635 - Enamel, Silicone Alkyd Copolymer MIL-P-25732 - Packing, Preformed, Petroleum Hydraulic Fluid Resistant, Limited Service at 275 F (135 C) MIL-PRF-28800 - Test Equipment for Use with Electrical and Electronic Equipment, General Specification for DEPARTMENT OF DEFENSE STANDARDS MIL-STD-108 - Defi
24、nitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-777 - Schedule of Piping, Valves, Fittings, and Associated Piping Components for Naval Surface Ships (Copies of these documents are available
25、online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawin
26、gs, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DRAWINGS NAVAL SEA SYSTEMS COMMAND (NAVSEA) 803-841569 - Ring, Steel, for Flush Mounted Plastic Case, Gauges an
27、d Thermometers 803-1385799 - Cases, Plastic for Pressure Gauges and Thermometers 803-1385850 - Piping, Instrument, Pressure, for all Services (Copies of these documents are available from the Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy
28、Yard DC 20376-5160 or by email at commandstandardsnavsea.navy.mil.) PUBLICATIONS NAVAL SEA SYSTEMS COMMAND (NAVSEA) NAVSEA S9074-AR-GIB-010/278 Requirements for Fabrication Welding and Inspection, and Casting Inspection and Repair for Machinery, Piping, and Pressure Vessels NAVSEA 0900-LP-001-7000 -
29、 Fabrication and Inspection of Brazed Piping Systems (Copies of these documents are available from the Naval Logistics Library, 5450 Carlisle Pike, Mechanicsburg, PA 17055 or online at http:/nll.ahf.nmci.navy.mil.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license
30、from IHS-,-,-MIL-G-18997E(SH) 5 CODE OF FEDERAL REGULATIONS 40 CFR 355, Appendix A - Protection of Environment Emergency Planning and Notification The List of Extremely Hazardous Substances and Their Threshold Planning Quantities. (Copies of this document are available from the Superintendent of Doc
31、uments, U.S. Government Printing Office, Washington DC 20401 or online at www.gpoaccess.gov/index.html.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in
32、the solicitation or contract. ASME INTERNATIONAL B40.l - Gauge - Pressure Indicating Dial Type - Elastic Element (DoD adopted) (Copies of this document are available from ASME International, 22 Law Drive, PO Box 2900, Fairfield, NJ 07007-2900 or online at www.asme.org.) ASTM INTERNATIONAL A 167 - St
33、andard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip (DoD adopted) A 276 - Standard Specification for Stainless Steel Bars and Shapes (DoD adopted) A 473 - Standard Specification for Stainless Steel Forgings (DoD adopted) A 480/A 480M - Standard Specifi
34、cation for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip (DoD adopted) A 581/A 581M - Standard Specification for Free-Machining Stainless Steel Wire and Wire Rods (DoD adopted) A 582/A 582M - Standard Specification for Free-Machining Stainless Steel
35、Bars (DoD adopted) B 26/B 26M - Standard Specification for Aluminum-Alloy Sand Castings (DoD adopted) B 36/B 36M - Standard Specification for Brass Plate, Sheet, Strip, And Rolled Bar (DoD adopted) B 85 - Standard Specification for Aluminum-A1loy Die Castings (DoD adopted) B 117 - Standard Practice
36、for Operating Salt Spray (Fog) Apparatus (DoD adopted) B 124/B 124M - Standard Specification for Copper and Copper-Alloy Forging Rod, Bar, and Shapes (DoD adopted) B 209 - Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate (DoD adopted) B 443 - Standard Specification for Nickel-C
37、hromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Plate, Sheet, and Strip (DoD adopted) B 637 - Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service (DoD adopted) D 788 -
38、 Standard Classification System for Poly (Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds (DoD adopted) D 2109 - Standard Test Methods for Nonvolatile Matter in Halogenated Organic Solvents and Their Admixtures (DoD adopted) D 5363 - Standard Specification for Anaerobic Single-Component
39、Adhesives (AN) (DoD adopted) F 331 - Standard Test Method for Nonvolatile Residue of Solvent Extract from Aerospace Components (Using Flash Evaporator) (Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., PO Box C700, West Conshohocken, PA 19428-2959 or online at ww
40、w.astm.org.) AMERICAN WELDING SOCIETY (AWS) AWS C3.4 - Specification for Torch Brazing (DoD adopted) AWS C3.5 - Specification for Induction Brazing (DoD adopted) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-18997E(SH) 6 AWS C3.6 - Specificat
41、ion for Furnace Brazing (DoD adopted) AWS C3.7 - Specification for Aluminum Brazing (DoD adopted) (Copies of these documents are available from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126 or online at www.aws.org.) NCSL INTERNATIONAL ANSI/NCSL Z540.1 - Calibration shall have
42、 no Navy occupational chemical reproductive hazards; and shall have no extremely hazardous substances (EHS) identified in Appendix A to Section 40 Code of Federal Regulations 355, The List of Extremely Hazardous Substances, shall have no benzene compounds (defined as any compound which contains benz
43、ene, shall have no chlorohydrocarbon compounds (defined as any compound whose only constituents are chlorine and carbon, such as tricholoethylene), and shall not contain chlorodifluoromethane (HCFC-22, CAS No. 75-45-6). 3.3.4.4 Deviation from cleaning requirements. Any deviation from the requirement
44、s of the 3.3.4 through 3.3.4.3.3 shall be obtained in writing from NAVSEA (see 6.2). 3.3.5 Welding and brazing. Internal pressure containing parts shall be joined by welding or brazing. Welding shall be in accordance with NAVSEA S9074-AR-GIB-010/278, brazing shall be in accordance with NAVSEA 0900-L
45、P-001-7000, and brazing using nickel-chromium based filler materials (e.g., Nicrobraz or equal) shall be in accordance with AWS C3.4, AWS C3.5, AWS C3.6, and AWS C3.7. 3.3.5.1 General applications. Joints shall be either brazed using nickel-chromium based filler materials or welded. Depending on the
46、 pressure range, NAVSEA S9074-AR-GIB-010/278, class P-1 or P-2 shall apply for welding. Class P-3 shall apply for brazing using nickel-chromium based filler materials. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-18997E(SH) 10 3.3.5.2 Oxygen
47、 applications. Joints shall be welded for all ranges, NAVSEA S9074-AR-GIB-010/278, class P-1 shall apply. 3.3.6 Threads. Threads shall be in accordance with FED-STD-H28. Tapered threads shall not be used except on 2- and 2-inch dial sizes for ranges 0/100 lb/in2 and below. 3.3.7 Case. Pressure gauge
48、 cases shall be safety solid front as defined in ASME B40.l. Nonsolid front is permitted for gauges with elastic element styles H and D (see 1.2.4). Nonsolid front gauges shall be constructed so that no parts of the gauge shall be propelled or thrown from the assembly due to an application of excess
49、ive pressure (see 4.4.13). Pressure shall be relieved out the back or side of the case should slow leakage or rupture of the pressure element assembly occur. 3.3.7.1 Circular scale gauges. 3.3.7.1.1 Flush/surface mounted case. Cases with the flush or surface mounted configuration shall be interchangeable for mounting purposes with the cases shown in Drawing 803-1385799. Case mounting dimensions shall
