1、MIL-F-24257A 66 7779906 0332640 T m +57-m MIL - F - 2 4 2 5 9 A ( SH ) 14 December 1987 SUPERSEDING MIL-F-24259 (SHIPS) 17 October 1966 (See 6.7) NILITARY SPECIFICATION FLUID FLOWFIETER, VOLUME VELOCITY TYPE This specification is approved for use within the Naval Sea Systems Command, Department of t
2、he Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers flowmeters for use in liquids such as fresh water, sea water, fuels and oils. The flow sensor, of the turbine, vortex, or drag type, shall be located in the l
3、iquid and actuated by the motion of that liquid. 2. APPLICABLE DOCUNENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbook. The following specifica- tions, standards, and handbook form a part of this specification to the extent specified herein. Unless otherwise specified, the
4、issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifi- cations and Standards (DoDISS) and supplement thereto, cited in the solicitation. 0 SPECIFICATIONS MILITARY MIL- s - 9 o 1 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and
5、 Systems, Requirements for. Equipment . MIL-P-15024 - Plates, Tags and Bands for Identification of MIL-P-15024/5 - Plates, Identification. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Command
6、er, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 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 6680 DISTRIBUTION STATEMENT A Approved for public relea
7、se; distribution unlimited ,- THIS DOCUMENT CONTAINS 24 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-El1 L - F - 24 2 5 9 A ( S H) IIILITARY (Continued) MIL-E-16400 - Electronic, Interior Communication and Navigation Equipment, Naval Ship a
8、nd Shore: General Specification for. Accessories, and Provisioned Items (Repair Parts): Packaging of. MIL-E117555 - Electronic and Electrical Equipment, MIL-R-28803 - Readouts, Segmented, General Specification for. STANDARDS MILITARY MIL-STD-105 MIL-STD-108 - Definitions of and Basic Requirements fo
9、r PlIL-STD- 129 - Marking for Shipment and Storage. MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment - Sampling Procedures and Tables for Inspection by Attributes. Enclosures for Electric and Electronic Equipment. 11 IL- STD - 2 O 2 MI L - STD - 4 3 8 NIL - STD - 45 4 11 IL - STD - 4 6 1
10、 MIL - STD - 4 6 2 MIL - STD - 4 7 O MIL-STD-47 1 MIL - STD - 7 7 7 MIL-STD-781 MI L - STD - 7 85 MIL - STD - 8 1 O (Type I - Environmental and Type II - Internally Excited) Component Parts. Associated Piping Components for Submarine Service. Equipment. Requirements for the Control of Electromagneti
11、c Interference. Measurements of. - Test Methods for Electronic and Electrical - Schedule of Piping, Valves, Fittings, and - Standard General Requirements for Electronic - Electromagnetic Emission and Susceptibility - Electromagnetic Interference Characteristics, - Maintainability Program for Systems
12、 and Equipment. - Maintainability Verification/Demonstration/ - Schedule of Piping, Valves, Fittings, and Evaluation. Associated Piping Components for Naval Surface Ships. - Reliability Design Qualification and Production Acceptance Tests: Exponential Distribution. - Reliability Program for Systems
13、and Equipment Development and Production. - Environmental Test Methods and Engineering Guidelines. DOD-STD-1399, - Interface Standard for Shipboard Systems MIL-STD-1553 Section 300 Electric Power, Alternating Current. (Metric) - Aircraft Internal Time Division Command(Response Multiplex Data Bus, II
14、ANDBOOK a 1 r MILITARY MIL-HDBK-217 - Reliability Prediction of Electronic Equipment. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-2Ll257A bb 77777Ob 0132bLl2 3 MI L-F - 24 25 9A ( SH ) 2.1.2 Other Government documents. The following other
15、 Government documents 0 form a part of this specification to the extent specified herein. Unless other- wise specified, the issues shall be those in effect on the date of the solicita- t ion, -._ - _ -. NAVAL SEA SYSTEMS COMMAND (NAVSEA) 0518-LP-394-6000 - Navy lanufacturing Screening Program - Decr
16、ease Corporate Costs and Increase Fleet Readiness. GENERAL SERVICES ADMINISTRATION GSA Supply Catalog. . (Application for copies should be addressed to the Superintendent of (I - Documents, U.S. Government Printing Office, Washington, DC 20402). D (Copies of specifications, standards, handbooks, and
17、 other Government documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity. ) 2.2 Order of precedence. In the event of a conflict between the text of this specification and the refe
18、rences cited herein (except for associated detail specifications, specification sheets or blS standards), the text of this specification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has .been obtained. 3. R
19、EQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.4 and 6.3). 3.2 Description. The flowmeters covered by this specification shall each consist of: (a) A flow sensor (see 3.4) which shall be liquid velocity-
20、responsive. Three types shall be covered: (1) Turbine types, which produce pulses by magnetic induction as (2) Vortex types, which produce pulses as liquid vortices are the turbine blades pass a sensing coil. shed from a specially shaped post in the liquid stream actuating a strain detector. Target
21、types, which produce a drag or force on a target area located within the liquid flow. The force exerted on the target shall be proportional to the square of the flow rate. A strain gauge connected to the target shall produce an output analog electrical signal. (3) (b) An electronics unit (see 3.5) w
22、hich may be combined with one of the indicator/control units (see (c) below). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-F - 2425 9A (SH) (c) Indicator/control units which shall provide the necessary indicators and controls as specified in
23、 3.6. 3.3 General requirements, The flowmeter equipment shall be in accordance with MIL-E-16400 to the extent specified herein. 3,3.1 Parts, materials, and processes. The selection, usage, and methods of implementation of parts, materials, and processes shall be in accordance with bIL-E-16400. 3.3.2
24、 Nonmetallic material. Nonmetals, when used for seals, protective Einiahes, and so forth, shall be moisture and flame resistant, shall not support fungus growth, and shall not be adversely affected by the ambient environments specified. 3.3.3 Accessibility. Parts and subassemblies which may require
25、servicing, repair, or replacement during the life of the flowmeter equipment shall be readily accessible for repair or replacement. L 3.3.4 Interchangeability. In no case shall parts be physically inter- changeable or reversible unless such parts are also interchangeable or reversible with regard to
26、 function, performance and strength. 3.3.5 Safety, Safety of flowmeter equipment shall be in accordance with requirement 1 of MIL-STD-454, 3.3.6 Painting and color. The flowmeter equpment and associated- subunits shall be painted in accordance with MIL-E-16400 except for any surfaces or other parts
27、where painting would impair meeting the requirements of this specfication. Color shall be in accordance with MIL-E-16400. 3.3.7 Duty cycle. The flowmeter equipment shall be constructed for continuous operation. 3,3,8 Power input. The flowmeter equipment shall operate with type I, 115 volts, 60 hertz
28、 (Hz) electrical ungrounded power as specified in DOD-STD-1399, section 300. power s interrupted and restored. The equipment shall not be damaged nor require recalibration when 3.3.9 Electrostatic discharge caution, Where devices such as complementary metal oxide semiconductors that are sensitive to
29、 electrostatic discharge are used, a note on the printed circuit board or subassembly shall indicate to handle with special care due to the possibility of electrostatic discharge damage. 3.3.10 Low flow rate exclusion. Unless otherwise specified (see 6.2.1), flow rates below 3 f 1 percent of rated f
30、ull flow for turbine and vortex type and below 10 f 4 percent of rated full flow for target type flowmeters shall be ignored by the flow totalizers back and forth of liquid in the monitored pipe from giving false liquid transfer information. This characteristic prevents “sloshing“ Provided by IHSNot
31、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-24257A bb 77773Ob 0232644 7 3.3.11 Flow rate range, The flowmeter equipment shall provide, as a minimum, the flow accuracy specified in 3.10.1. The flow range shall be as specified (see 6.2.1) and shall be marked o
32、n the flow sensor identification plate (see 3.9). 3.3.12 Nultiplex data bus. When specified (see 6.2.1), the flowmeter equipment shall interface with a time division command/response multiplex data bus system in accordance with MIL-STD-1553. 3.3.13 Protection of controls and adjustments. Controls an
33、d adjustments that may be accidentally or inadvertently changed and disrupt or render inaccurate readouts and indicators shall be protected from such an inadvertent change by placement behind a cover or by requiring two operations for actuation. 3.3.14 Connectors and interconnecting cables. The subu
34、nits of the flowmeter equipment, including flow sensor, electronics unit, and indicator/control units, shall be connected to each other, as required, by interconnecting cables utilizing connectors on both ends of each cable mating to connectors on the subunits. Cables and connectors shall be as spec
35、ified in MIL-E-16400. The equipment shall operate as specified when the subunits are separated from each other by up to 500 feet of cabling. Where the electronics unit is separate from the indicator/control unit, the flow sensor shall operate up to 1000 feet from the indicator/control unit. The inte
36、rconnecting cable lengths shall be as specified (see 6.2.1). 3.4 Flow sensor requirements. Flow sensor requirements shall be as specified in 3.4.1 through 3.4.7. 3.4.1 Flow sensor end connections. Unless otherwise specified (see 6.2.1), flanged end connections shall be employed in accordance with MI
37、L-STD-438 for submarines and MIL-STD-777 for surface ships. 3.4.2 Flow sensor material. The flowmeter material in contact with the liquid to be measured shall be compatible with the liquid and the flange material (see 3.4.1). MIL-STD-438 or MIL-STD-777, as applicable, and the dissimilar metal provis
38、ions of MIL-E-16400 shall determine the choice of flowmeter material. 3.4.3 Flow sensor degree of enclosure. The flow sensor unit, including the electrical connector, shall be splashproof protected as specified in MIL-STD-108 (see 4.8.7). 3.4.4 Flow sensor pressure rating. Unless otherwise specified
39、 (see 6.2.1), the flowmeter shall have a safe working pressure of 600 pounds per square inch (lb/in2). sensor identification plate (see 3.9). requirements of this specification at any liquid pressure from atmospheric to the flowmeters rated operating pressure. The working pressure shall be marked on
40、 the flow The flowmeters shall meet the accuracy 3.4.5 Liquid to be measured. The liquid whose flow is to be measured shall be specified (see 6.2.1) and shall be marked on the flow sensor identifi- cation plate (see 3.9). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without
41、 license from IHS-,-,-FlIL-F-2425( SH) e 3.4.5,l Liquid viscosity. The viscosity range of the liquid whose flow is to be measured shall be as specified (see 6.2.1). 3.4.5.2 Liquid operating temperature. The operating temperature range of the liquid whose flow is to be measured shall be as specified
42、(see 6.2.1). If unspecified, the accuracy requirement shall be met over a liquid temperature range of 28 to 160 degrees Fahrenheit (OF) (see 4.8.10.1). 3.4.5.3 Specific gravity. The specific gravity of the liquid whose flow is to be measured shall be as specified (see 6.2.1). 3.4.6 Straight pipe req
43、uirement. Flow sensors shall minimize lengths of straight inlet and outlet piping required for the equipment to operate within unobstructed piping shall not exceed 10 pipe diameters at the inlet to the flow sensor and 5 pipe diameters at the outlet of the flow sensor. mounting space exists for 10 di
44、ameters upstream and 5 diameters downstream, a reduced straight pipe requirement shall be as specified (see 6.2.1). the accuracy limits specified in 3.10.1. Required lengths of straight, t If insufficient 3.4.7 Pressure drop caused by the sensor. The allowable pressure drop across the sensor shall b
45、e as specified (see 6.2.1), and shall be related to flow rates. 3.5 Electronics unit. the flow sensor, provide signal conditioning as required, and provide outputs to the indicatQr/control units. separate from the indicator/control unit. The electronics unit shall accept a signal from The electronic
46、 unit may be a part of or 3.5.1 Maximum dimensions of electronics unit. The dimensions of the electronics unit shall be kept to a minimum consistent with required accessibility of internal parts (see 3.3.3). 3,5.2 Electronics unit degree of enclosure. The electronics unit shall be splashproof protec
47、ted as specified in MIL-STD-108 (see 4.8.7). 3.5.3 Mounting of electronics unit. If the indicator/control unit is combined with the electronics unit, the resultant unit shall be panel mounted in accordance with MIL-E-16400 to provide operator access to the readouts and operating controls. indicators
48、, it shall be constructed for bulkhead mounting in accordance with MIL-E-16400, If the electronics unit contains no operating controls or 3.6 Indicator/control units. At least one indicator/control unit shall If more than one indicator/control be provided with the flowmeter equipment. unit is requir
49、ed, the total number of units shall be as specified (see 6.2.1). Each different indicator/control unit shall be uniquely identified on the identification plates. Each indicator/control unit shall provide one or more of the following readouts as specified (see 6.2.1): 3.6.8), flow rate display (see 3.6.9), and preset batch display (see 3.6.10). The type of display (digital or analog) shall be as specified (see 6.2.1). total flow display (see Provided by IHSNot for ResaleNo rep
