monitor elements and housings.

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MIL-PRF-81380E

ASTM-D3948

Determining Water Separation Characteristics of

Aviation Turbine Fuels by Portable Separometer,

Standard Test Method for. (DoD Adopted)

ASTM-D5006

Measurement of Fuel System Icing Inhibitors (Ether

Type) in Aviation Fuels, Standard Test Method for.

(DOD Adopted)

(Copies of these documents are available from www.astm.org or from the American Society

for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

Boiler and Pressure Vessel Code, Section VIII, Division 1

(Copies of this document are available from www.asme.org or from American Society of

Mechanical Engineers, 3 Park Avenue, New York, NY 10016-5990.)

2.4 Order of precedence. In the event of a conflict between the text of this document and the

references cited herein, the text of this document takes precedence. Nothing in this document,

however, supersedes applicable laws and regulations unless a specific exemption has been

obtained.

3. REQUIREMENTS

3.1 Qualification. The fuel monitor elements and housings furnished under this specification

shall be products that are authorized by the qualifying activity for listing on the applicable

qualified products list (QPL) before contract award (see 4.2 and 6.3).

3.2 Materials. All metal parts in contact with the fuel shall be free of zinc, cadmium, copper

and their alloys. Sensing lines on the housing shall be stainless steel. Carbon steel vessels shall

be internally coated with a light colored epoxy coating, which is compatible with those fuels

listed in section 3.2.1.

3.2.1 Compatibility. Materials used in aviation fuel monitors shall not be adversely affected

by and shall have no effect on fuels and inhibitors conforming to MIL-DTL-5624, MIL-PRF-

25017, MIL-DTL-83133, MIL-DTL-85470, ASTM-D910 and ASTM-D1655. Compatibility

with additional fuels and inhibitors shall be specified in the contract if necessary (see 6.2).

3.3 Element configuration and flow rate. The filter/monitor elements shall be as shown on

figure 1. Element length shall be as specified by the contracting activity (see 6.2). Direction of

flow shall be from outside to inside of the element. The open end shall be configured so as to

affect a positive, non-leaking seal when seated properly in the filter/monitor housing. Each

element shall have a minimum flow rate of one gallon per minute (gpm) per inch of nominal

length (0.063 liters per second per 2.54 cm). The filter/monitor element shall not include any

device that will cause an immediate or sudden stoppage of fuel flow.