MIL-F-24701

Abstract

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. <br>The flowmeters covered by this specification shall be of the ultrasonic type employing the non-intrusive, transit time transduction principle. <br>The flowmeters covered by this specification shall have the characteristics specified in <a>1.2.2.1</a> through <a>1.2.2.7</a>. <br>The liquid measured shall be sea water, fresh water, fuel oil, lube oil, or other liquids as specified in the contract or order (see <a>6.2.1</a>). <br>The range of liquid flow rate measured shall be as specified in <a>3.3.9.4</a> (see <a>6.2.1</a>). <br>The flow totalization capability of the flowmeter equipment shall range from zero to all nine's for the number of decimal digits specified in the contract or order (see <a>6.2.1</a> and <a>3.3.12</a>). If unspecified, the number of decimal digits shall be five. <strong>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 55Z3, 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.</strong> <br>When specified in the contract or order (see <a>6.2.1</a>), a flow rate meter shall be located in the equipment locations as specified (see <a>3.3.12</a>). <br>Unless otherwise specified (see <a>3.3.12</a> and <a>6.2.1</a>), two remote control/readout units per flowmeter system shall be provided. <br>When specified in the contract or order (see <a>6.2.1</a>), 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. <br>When specified in the contract or order (see <a>6.2.1</a>), flow rates below a specified or adjustable value shall be ignored by the flow totalizers. This option is useful, for example, to prevent "sloshing" back and forth of liquid in the monitored pipe from giving false liquid transfer indication, especially when uni-directional flow totalizers are employed. <br>When specified in the contract or order (see <a>6.2.1</a>), the flowmeter equipment shall interface with a time division command/response multiplex data bus system in accordance with MIL-STD-1553. <b><u>Intended Use:</u></b> The flowmeter equipment covered by this specification provides readouts of total liquid flow and, as an option, flow velocity (see <a>1.2.2.3</a>) and are intended for use aboard U.S. Navy surface ships and submarines. The flow of the following types of liquids may be measured: (a) Sea water. (b) Fresh water. (c) Fuel oil. (d) Hydraulic oil. (e) Lube oil. (f) Contents of bilge (may be mixture of oils and water). (g) Any other liquid as specified in the contract or order. <br>