1、IINC“D1 N IL-D - 2 35 2 3D ( SH) 23 November i987 SUPERSEDING FlIL - D - 2 3 5 2 3C (SHIPS ) 19 August 1975 (See 6.9) PlILITARY SPECIFICATION DEHYDRATOR, LOW PRESSURE AIR, FOR SPECIAL APPLICATIONS This specification is approved for use within the Naval Sea Systems Command, Department of the Navy, ai
2、id is available for use by all Departments arid Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification contains requirements for an automatic dehydrator for use in low pressure air systems. particulate matter, aerosols (see 6.5) and water vapor from influent low pres- sure. ai
3、r and furnish clean, dry air as specified herein for use in pressurizing -radar equipment, waveguide transmission systems, steam propulsion plant control systems, operating automatic combustion control and other special low pressure air applications. intermittent operation. equipment throughout this
4、 Specification. The dehydrator shall remove The dehydrator shall be designed for both continuous and The word “dehydrator“ denotes the entire complex of 1.2 Classification. Dehydrators are classified as follows: 1.2.1 Types. The dehydrator shall be of the following types, as speci- fied (see 6.2.1):
5、 Type I - Refrigeration. Type II - Heater self-reactivating desiccant. 1.2.2 Capacity. The nominal capacity (nominal effluent air flow rate) for the dehydrator shall be of the following classes as specified (see 6.2.1): Class 3 - 30 standard cubic feet per minute (ft3/min). Class 5 - 100 ft3/min. Cl
6、ass 7 - SpeciaI, nominal capacity as specified (see 6.2.1). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC
7、 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 4440 DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited THIS DOCUMENT CONTAINS 35 PAGES, Provided by IHSNot
8、for ResaleNo reproduction or networking permitted without license from IHS-,-,-2. APPLICABLE DOCUFIENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and dards form a part of this specification to the extent specified herein. st Unless otherwise specified
9、, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and the supplement thereto, cited in the solicitation. SPECIFICATIONS FEDERAL QQ-C-390 QQ-C-465 QQ-N-281 QQ -N - 28 6 TT-E-490 TT-P-645 PPP-B -60 1 PPP-B- 62
10、 1 MILITARY NIL-C-104 FIIL-P-116 MIL-S -90 1 NI L-E - 9 17 PlIL-F-1183 MIL - E - 2 O 3 6 Pl IL - c - 2 2 12 MIL - L- 3 6 6 1 MIL- L - 3 6 6 1 / 65 MIL-M-3971 - Copper Alloy Castings (Including Cast Bar). - Copper-Aluminum Alloys (Aluminum Bronze) (Copper Alloy Numbers 606, 614, 630 and 642); Rod, Fl
11、at Products with Finished Edges (Flat Wire, Strip, and Bar), Shapes, and Forgings. Strip, Wire, Forgings, and Structural and Special Shaped Sections. - Nickel-Copper-Aluminum Alloy, Wrought (UNS NOSSOO). - Enamel, Silicone Alkyd Copolymer, Semigloss (For Exterior and Interior Use). - Primer, Paint,
12、Zinc Chromate, Alkyd Type. - Boxes, Wood, Cleated-Plywood. - Boxes, Wood, Nailed and Lock-Corner. - Nickel-Copper Alloy Bar, Rod, Plate, Sheet, - Crates, Wood: Lumber and Plywood-Sheathed, - Preservation, Methods of. - Shock Tests, H.I. (High-Impact); Shipboard Nailed and Bolted. Machinery, Equipmen
13、t and Systems, Requirements for. - Cable and Cord, Electrical, for Shipboard lise, General Specification for. - Electric Power Equipment, Basic Requirements (Naval Shipboard Use). - Fittings, Pipe, Cast Bronze, Silver-Brazing, General Specification for. - Enclosures for Electric and Electronic Equip
14、ment, Naval Shipboard. - Controllers, Electric Motor A.C. or D.C., and Associated Switching Devices. - Lampholder, Indicator Lights, Indicator Light Housings, and Indicator Light Lenses, General Specification for. - Lampholder, Lights, Indicator (Housing), Style LH98. - Meters, Time Totalizing, Non-
15、Hermetically Sealed, Electrical: General Specification for. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-D-23523D 44 H 777790b 0214Ob3 3 a 1 a P a a Pl1 LITARY (Continued) NIL- S - 8805 - Switches and Switch Assemblies , Sensitive and Push (
16、Snap Action), General Specification for. NIL-T-15005 - Tube, 70-30 and 90-10 Copper-Nickel Alloy, Con- denser and Heat Exchanger. MIL-P-15024 - Plates, Tags and Bands for Identification of Equipment. MIL-P-15024/5 - Plates, Identification. NIL-S-15291 - Switches, Rotary, Snap Action and Detent/Sprin
17、g NIL-A-15303 - Audible Signals: Alarms, Bells, Buzzers, Horns, NIL-(2-15726 - Copper-Nickel Alloy, Rod, Flat Products (Flat MIL-S-16032 - Switches and Detectors, Shipboard Alarm Systems. MIL-P-17059 - Plotors, 60-CycleY Alternating-Current, Fractional H.P. (Shipboard Use). IIL-M-17060 - Motors , 60
18、-Hertz, Alternating Current, Integral- Horsepower, Shipboard Use. MIL-1-18997 - Indicator, Pressure, Panel Elounted or Case Sup- ported, General Specification. NIL-I-18997/1 - Indicators, Pressure, Circular Dial (3-1/2, 4-1/2 and 8-1/2 Inch Dial Sizes). NIL-R-19523 - Relays, Control, Naval Shipboard
19、. PIIL-T-19646 - Thermometers, Remote Reading, Self-Indicating Dial, Gas Actuated. MIL-H-22577 - Heating Elements, Electrical: Cartridge, Strip and Tubular Type. MIL-1-24144 - Indicators, Frost-Point/Dew-Point, Self-Cooling, Semi-Portable. NIL-V-24578 - Valves, Globe, Pressure Instrument, Stem Test
20、Connect ion, Union End. NIL-M-385 10 - Microcircuits, General Specification for. MIL-C-52950 - Crates, Wood, Open and Covered. Return Action, General Specification for. and Sirens, Electronic, Shipboard. Wire, Strip, Sheet, Bar, and Plate) and Forgings. STANDARDS FEDERAL FED-STD-H28 - Screw-Thread S
21、tandards for Federal Services. Pl I LITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD- 167 - 1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Inter- nally Excited). MIL-STD-278 - Welding and Casting Standard. MIL-STD-454 - Standard General Requireme
22、nts for Electronic MIL-STD-461 Equipment. Requirements for the Control of Electromagnetic Interference. - Electromagnetic Emission and Susceptibility 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-D-23523D (SH) NILITARY (Continued) NIL-STD-47
23、1 NIL-STD-769 NIL-STD-777 - Scliediile of Piping, Valves , Fittings , and - llaintainability Ver if ication/Demonstration/ - Thermal Insulation Requirements for Machinery Evaluation. and Piping. Associated Piping Components for Naval Surface Ships. Waterproofing; with Appropriate Test Methods. abili
24、ty Program Requirements (for Systems and Equipments). MIL-STD-1378 - Requirements for Employing Standard Electronic Nodules. NIL-STD- 1389 - Design Requirements for Standard Electronic Nodules. DOD-STD-1399, - Interface Standard for Shipboard Systems Electric Section 300 Power, Alternating Current.
25、(Metric) MIL-STD-1472 NIL-STD-1635 - Reliability Growth Testing. MIL-STD-1186 - Cushioning, Anchoring, Bracing, Blocking and MIL-STD-1367 - Packaging, Handling, Storage, and Transport- - Human Engineering Design Criteria for Military Systems, Equipment and Facilities. 2.1.2 Other Government drawings
26、 and publications. The following other Government drawings aiid publications form a part of this specification to the extent specified herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. DRAWINGS k ILITARY 803-841499 - Strainer, Bronze, 250 PSI, a
27、t 425F Elax. 803-1385850 - Piping, Instruments, Pressure for All 810-2145528 - Fittings and Adaptors, Instrument, Service. Pressure. PUBLICATIONS NAVAL SEA SYSTEMS COMtfAND (NAVSEA) 0967-LP-597-1011 - Electronic Equipment, Parts Application and 0900-LP-001-7000 - Piping System Brazed, Fabrication an
28、d Reliability Information Manual for Navy. Inspect ion. (Copies of specifications, standards, drawings and publications required by contractors in connection with specific acquisition functions should be obtained froni the contracting activity or as directed by the contracting activity.) 2.2 Other p
29、ublications. The following documents form a part of this speci- fication to the extent Specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted shall be those listed in the issue of the BoDISS specified in the solicitation. Unless otherwise specified, the issue
30、s of documents not listed in the DoDISS shall be the issue of the nongovernment documents which is current on the date of the solicitation. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- NIL-D-23523D 4q O6 0234065 7 W A?ERICAN SOCIETY FOR TESTING
31、 AND NATERIALS (ASTM) A 312 - Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipe. (DoD adopted) B 62 - Standard Specification for Composition Bronze or Ounce Netal Castings. (DoD adopted) D 3951 - Standard Practice for Commercial Packaging. (DoD adopted) (Application for
32、copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the documents. These documents also may be availabl
33、e in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specifi- cation
34、 shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspection
35、(see 4.4 and 6.4). 3.2 Reliability. The mean time between failures (MTBF) of the dehydrator assembly shall be not less than 3,000 hours (see 4.7.3.5). A failure shall be any condition or malfunction that requires the dehydrator to be taken off the line for corrective maintenance, or air output that
36、does not meet the minimum dew point, flow capacity, or pressure requirements as specified herein. 3.3 Maintainability. The dehydrator shall be such that all maintenance, both corrective and preventive, can be accomplished at the organizational level with no outside assistance. Preventive and correct
37、ive maintenance shall be accomplished by a machinist mate third class with no formal equipment training. Maintainability shall be demonstrated in accordance with 4.7.4. 3.3.1 Preventive maintenance. The mean preventive maintenance time shall be not greater than 10 man-hours per month. preventive mai
38、ntenance action shall be not greater than 3 man-hours by a machinist mate third class with no formal equipment training. The time required to perform any 3.3.2 Corrective maintenance. The unit shall have a mean time to repair (MTTR) of not more than 3 man-hours. action shall be not greater than 5 ma
39、n-hours. The maximum time to perform any corrective 3.4 General description. The dehydrator shall be capable of effluent flows from zero to nominal rated flow without requiring manual attention. Unless other- wise specified (see 6.2.1), dehydrators shall be shipboard deck mounted. Each dehydrator sh
40、all be housed in a metal cabinet enclosing the top, sides, and back. The cabinet shall protect the internal piping and components of the dehydrator 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-from the shipboard environment, for example, drippin
41、g salt and fresh water, steam leaks, falling objects such as tools and fasteners, and the intrusion of pipe sections and tool handles as may occur during extensive refit activity in the immediate vicinity. 3.4.1 Type I, refrigerated. The type I dehydrator shall be a regenerative The dehydrator shall
42、 consist of a regenerative compression refrigerant type intended for continuous noncycling operation at the conditions specified herein. air-to-air heat exchanger, refrigerant condenser, evaporator, separators, auto- matic condensate discharge device with manual override, filters, accessories, and i
43、nstrumentation specified herein. Unless otherwise specified (see 6.2.1), the refrigerant condenser shall be sea water cooled. assembled complete, self-contained with the refrigersnt equipment dehydrated and charged with the necessary operating quantities of refrigerant and oil. shall operate as spec
44、ified herein after removal of shipping protection, opening of valves, aiid connection to services. The unit shall be factory The unit 3.4.2 Type II, heater self-reactivating desiccant. The type II dehydrator shall be fully automatic. heaters, filters, tower purge assembly, accessories and instrument
45、s specified herein. Each tower shall have at least one removable head to facilitate replace- ment of desiccant and inspection of tower internals. Reactivation purge air flow direction through tlic desiccant towers shall be the reverse of the dehydrating air flow. Iieaterless type II dehydrators shal
46、l be prohibited. The dehydrator shall consist of desiccanl: towers, 3.4.3 Arrangement and accessibility. The dehydrator shall be configured such that operation, maintenance, and repair of the unit can be accomplished from the front of the unit. Piping, wiring, instruments, and other components shall
47、 be arranged such that their partial disassembly or removal is not required to provide ready access to components requiring preventive maintenance. Desiccant chambers for a type II dehydrator shall be removable from the front of the dehydrator without disassembly of piping or other components, conne
48、ctions, and calibration connections in the dehydrator shall permit easy accessibility without requiring removal or relocation of any components. captivated fasteners shall be used to facilitate installation and removal of the cabinet panels. Instrument panels shall be mounted as necessary so as not
49、to interfere with the accessibility requirements of this paragraph. double-door arrangements, hinged to the frame, with flexible tubing links and extra length wiring to permit the panels to be swung clear of the maintenance work area within the dehydrator. access for daily operations. machine operator. Test points, test Threaded This may require The panel shall be constructed with easy Instruments shall be clearly visible to the 3.4.4 Phyciieters. The dehydrator shall not exceed
