1、MIL-F-24701 bb 7777qOb 0133177 O I INCH-POUND I NIL-F-24701 (SH) 23 March 1988 MILITARY SPECIFICATION FLOWMETER, LIQUID, ULTRASONIC, NON-INTRUSIVE This specification is approved for use within the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agen
2、cies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for non-intrusive, ultrasonic, liquid flow measuring equipment including the digital readout for use on Naval surface ships and submarines. 1.2 Tvoe and characteristics. 1.2.1 Type. The flowmeters cover
3、ed by this specification shall be of the ultrasonic type employing the non-intrusive, transit time transduction principle. 1.2.2 Characteristics. The flowmeters covered by this specification shall have the characteristics specified in 1.2.2.1 through 1.2.2.7. 1.2.2.1 Application. The liquid measured
4、 shall be sea water, fresh e water, fuel oil, lube oil, or other liquids as specified in the contract or order (see 6.2.1). 1.2.2.2 Range. 1.2.2.2.1 Flow rate range. The range of liquid flow rate measured shall be as specified in 3.3.9.4 (see 6.2.1). 1.2.2.2.2 Flow totalization. The flow totalizatio
5、n capability of the flow- meter equipment shall range from zero to all nines for the number of decimal digits specified in the contract or order (see 6.2.1 and 3.3.12). the number of decimal digits shall be five, If unspecified, Beneficial comments (recommendations , additions , deletions) and any p
6、ertinent 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, DG 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this
7、 document or by letter. AMSC N/A FSC 6680 DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited , THIS DOCUMENT CONTAINS 25 PAGES. /-L-“ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-F-24701 (SH) 1.2.2.3 Flow rate meter o
8、ption. When specified in the contract ororder (see 6.2.1), a flow rate meter shall be located in the equipment locations as specified (see 3.3.12). 1.2.2.4 Remote control/readout units. Unless otherwise specified (see 3.3.12 and 6.2.1), two remote control/readout units per flowmeter system shall be
9、provided. 1.2.2.5 Up-down flow totalizer option. When specified in the contract or order (see 6.2.1), the flowmeter equipment shall decrement the totalizer readouts when the measured liquid flow reverses from that direction which causes the flow totalizers to increase in readout value. 1.2.2.6 Low f
10、low rate exclusion option. When specified in the contract or order (see 6.2.1), flow rates below a specified or adjustable value shall be ignored by the flow totalizers. sloshing“ back and forth of liquid in the monitored pipe from giving false liquid transfer indication, especially when uni-directi
11、onal flow totalizers are employed. This option is useful, for example, to prevent II 1,2.2.7 Multiplex data bus option. When specified in the contract or order (see 6.2,1), the flowmeter equipment shall interface with a time division command/response multiplex data bus system in accordance with MIL-
12、STD-1553. 2, APPLICABLE DOCUMENTS 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 issues of these documents shall be thos
13、e listed in the issue of the Department of Defense Index of Speci- fications and Standards (DoDISS) and supplement thereto, cited in the solici- tation. SPECIFICATIONS FEDERAL PPP-F-320 - Fiberboard, Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes. MIL I TARY MIL-S -90 1 - Shock
14、Tests, H.I. (High-Impact); Shipboard Machin- ery, Equipment and Systems, Requirements for. MIL-P-15024 - Plates, Tags and Bands for Identification of Equipment. MIL-E-16400 - Electronic, Interior Communication and Navigation Equipment, Naval Ship and Shore, General Speci- f icat ion for, MIL-E-17555
15、 - Electronic and Electrical Equipment, Accessories, and Provisioned Items (Repair Parts): Packaging of. MIL-L-19140 - Lumber and Plywood, Fire-Retardant Treated. MIL-R-28803 - Readouts, Segmented, General Specification for. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted with
16、out license from IHS-,-,-MIL-F-24701 bb 7777906 0133181 7 W MIL-F-24701 (SH) STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection MIL-STD-108 - Definitions of and Basic Requirements for Enclo- MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment by Attributes. sures
17、 for Electric and Electronic Equipment. HANDBOOK PI L- STD - 2 O 2 MI L - STD - 45 4 MIL - STD - 4 6 1 MIL - STD - 46 2 NIL- STD - 47 O MIL-STD-47 1 MIL- STD - 7 8 1 MIL-STD-785 MI L - STD - 8 1 O (Type I - Environmental and-Type II - Internally Excited). ponent Parts. Equipment. Requirements for th
18、e Control of Electromagnetic Interference. Measurement of. - Test Methods for Electronic and Electrical Com- - Standard General Requirements for Electronic - Electromagnetic Emission and Susceptibility - Electromagnetic Interference Characteristics, - Maintainability Program for Systems and Equipmen
19、t. - Maintainability Verification/Demonstration/ Evaluation. - Reliability Testing for Engineering Development, Qualification and Production. - Reliability Program for Systems and Equipment Development and Production. - Environmental Test Methods and Engineering Guidelines. MIL-STD-1388 - Logistic S
20、upport Analysis. DOD-STD-1399, - Interface Standard for Shipboard Systems Electric MIL-STD-1553 - Aircraft Internal Time Division Command/Response MIL-STD-45662 - Calibration Systems Requirements. Section 300 Power, Alternating Current. (Metric) Multiplex Data Bus. MILITARY MIL-HDBK-217 - Reliabilit
21、y Prediction of Electronic Equipment. (Copies of specifications, standards, and handbooks 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
22、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 specification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and reg
23、ulations unless a specific exemption has been obtained. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L -E - 24 7 O 1 ( SH ) 3. REQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to fi
24、rst article inspection (see 4.4 and 6.3). 3.2 Materials. Material shall be in accordance with 3.2.1, 3.2.2, and as specified herein. 3.2,l Parts, materials and processes. The selection, usage, and methods of implementation o parts, materials and processes shall be in accordance with MIL-E-16400. Cad
25、mium plating shall not be used. 3.2.2 Nonmetallic material. When used for seals, protective finishes, and so forth, nonmetals shall be moisture and flame resistant, shall not support fungus growth, and shall not be adversely affected by the ambient environments specified herein. 3.3 Construction. Fl
26、owmeter construction shall be in accordance with 3.3.1 through 3.3.16. 3.3.1 General. The flowmeter equipment shall be in accordance with the type, transduction principle, application, range, and multiplex data bus option specified in 1.2. Unless otherwise specified (see 6.2.1), the flowmeter equip-
27、 ment shall consist of three subunits: conditioner, and the remote display/control units. Each transducer assembly consists of two or more transmit/receive transducers attached to the outside of the pipe by an appropriate mounting assembly, Transmit and receive connections to the flow computer are m
28、ade through coaxial cables. shall interface with the transducer assembly and two remote control/readout assemblies. These remote control/readout assemblies shall provide the functions specified in 3.3.12. the transducer assembly, the signal The signal conditioner 3.3.2 Accessibility. Parts and subas
29、semblies which may require servicing, repair, or replacement during the life of the flowmeter equipment shall be readily accesiible for repair or replacement. 3.3.3 Interchangeability. In no case shall parts be physically inter- changeable or reversible unless such parts are also interchangeable or
30、revers- ible with regard to function, performance and strength. 3,3.4 Painting and color. When specified in the contract or purchase order, the flowmeter equipment and associated subunits shall be painted in accordance with MIL-E-16400, except for any sensing surfaces of the transducer or other part
31、s wherein painting would impair meeting the requirements of this specification, The color shall be in accordance with MIL-E-16400. (Stainless steel shall not be palnted when present.) M b U 3.3.5 Multiple flowmeter in one system. When specified in the contract or order (see 6.2.1), multiple flowmete
32、rs shall be installed so that flow in more than one pipe can be measured. of th or O to at least 22 feet per second for systems utilizing only unidirectional liquid flow readouts or liquid transfer. 3.3.9.5 Sensor orientation. The sensor shall meet the requirements of this specification when install
33、ed on pipe which has an angular orientation from horizontal to vertical. When installed on horizontal pipe, the transducers shall be mounted in a horizontal plane to avoid interference from possible sediment lying at the bottom of the pipe and air bubbles at the top of the pipe. P iP wil 3.3.9.6 Str
34、aight pipe. Flow transducers shall minimize lengths of straight ing required at the transducer inlet and outlet in order that the equipment 1 operate within the accuracy limits specified in 3.4.1. Required lengths of straight, unobstructed piping shall not exceed three diameters (with reference to t
35、he inside nominal pipe diameter) at the inlet of the flow transducer and three diameters at the outlet of the flow transducer. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ElIL-F-24701 (SH) 3.3.9.7 Continuous excitation. The flow transducers sha
36、ll withstand continuous, worst-case (maximum) excitation under conditions of the pipe completely void of liquid as well as full of liquid and any condition between empty and full, and with the ambient and liquid temperatures at the highest points of the range specified herein. 3.3.10 Signal conditio
37、ner. 3.3.10.1 Connection to other assemblies of the flowmeter equipment. 3.3,lO.l.l Connection to transducer assembly. A sufficient connection sys- tem (usually a coaxial connection to each of the two transducers of one transducer assembly) shall be provided so that the flowmeter equipment shall mee
38、t all of the requirements of this specification. tract or order (see 6.2.1), the length of cable to the transducer assembly shall be 100 k 1.5 feet. Unless otherwise specified in the con- The maximum cable length capability shall be 500 feet. * C s. 3.3.10.1.2 Connection to remote control/readout as
39、semblies. A connection system shall be provided to remote control/readout assemblies so that the flowmeter equipment shall meet all of the requirements of this specification. Unless otherwise specified in the contract or order (see 6.2.1), the length of cable to the remote control/readout assembly s
40、hall be 100 k 1.5 feet. maximum cable length capability shall be 500 feet. The 3,3.10.2 Signal from and to remote control/readout assemblies. The signal for each digit shall be either multiplexed in order to reduce the number of wires in the interconnecting cable, or an equal or better system in ter
41、ms of relia- bility,.size and weight Unless otherwise specified in the contract or order (see 6.2.1), a five decimal digit readout up to 99,999 (X10) pounds total flow shall be provided for. The signal conditioner shall accept any control signals that associated remote control/readout units supply,
42、and perform the intended functions, Examples of these functions are reset, which zeroizes the flow totalizer, and test, which causes a self-test to be performed. O 3.3.11 Controls and indicators. The following controls and indicators shall be provided. 3.3.11.1 Low flow rate reject control. When spe
43、cified in the contract or order (see 6.2.1), means shall be provided which shall ensure that flow rates below the specified amount plus or minus 5 percent shall be excluded from flow totalization. Unless otherwise specified (see 6.2.1), a control shall be provided that will vary the reject cutoff po
44、int from zero to the amount specified plus a minimum of 30 percent. If a flow velocity meter is included in the system, it shall register down to zero flow and not be affected by the totalization low flow rate reject system: 3.3.11.2 Calibration and maintenance controls. Controls shall be provided,
45、if required, to perform calibration and maintenance so that the equipment will meet the requirements of this specification over the life of the equipment. A control may be required for scale factor and shall be provided to meet the above calibration requirement when the units are mass produced. Prov
46、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- MIL-F-24701 66 m 77777Ob 0133185 b t O Pl IL - F - 2 4 7 O 1 ( SH ) 3.3.11.2.1 Flaintenance accessibility. A “test“ connector or equivalent means shall be provided for easy access to internal signals for
47、 testing, Cali- bration, and troubleshooting purposes. If technically feasible, an extender card, stowed in a spare slot, shall be provided to troubleshoot any plug-in cards. aturized equipment where replacement of the whole assembly is required. The test connector and extender card requirements are
48、 waived for mini- 3.3.11.3 Fine tuning control and indicator. A fine tuning control and indicator shall be provided when required to meet the requirements of this- specification, for example, to adjust the ultrasonic frequency generated by the signal conditioner to match the requirement of the trans
49、ducer. 3.3.11.4 Fault indicator. Unless otherwise specified in the contract or order (see 6.2.1), a signal to energize an indicator shall be provided when required to meet the requirements of this specification, to alert personnel that the received signal has not been detected within a preprogrammed time interval. This indicator shall be energized during normal operation due to temporary liquid conditions (such as bubbles or non-sonically conductive matter), and deenergize
