MIL-DTL-55023D
document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Description. The manometers shall be designed to be used with any of the
commercial indicator fluids for determining positive pressure, vacuum, and pressure differentials.
All parts subject to wear, breakage, or distortion shall be accessible for adjustment, replacement,
and repair.
3.1.1 Type I. Type I shall be of the vertical type, with straight indicating tubes. Size 1
shall be adaptable for mounting on a wall or table stand. Size 2 shall be for wall-mounting only.
3.1.2 Type II. Type II shall be of the inclined vertical type, with a curved tube. The
lower portion of the tube has a slight inclination from horizontal to provide low-range accuracy.
The upper portion of the tube has a slight inclination from vertical to provide high capacity.
3.1.2.1 Style A. Style A shall consist of an indicating tube curved in a smooth bend
throughout its entire length, and calibrated logarithmically with uneven graduations. Style A
shall be for wall-mounting only.
3.1.2.2 Style B. Style B shall be similar to style A, except that the curve shall be an
abrupt bend, thus forming two straight-tube portions at an angle to each other. Each straight
portion shall be independently arithmetically calibrated with even graduations. Style B shall be
adaptable for wall-mounting. When specified (see 6.2), table-stand mounting shall be provided.
3.2 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.2.
3.3 Standard commercial product. Standard commercial (see 6.3.1) manometers may be
furnished if they meet the minimum requirements of this specification. Additional or better
features which are not specifically prohibited by this specification, but which are a part of the
manufacturer's commercial product shall be included in the manometers being furnished.
3.4 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible,
provided that the material meets or exceeds the operational and maintenance requirements, and
promotes economically advantageous life cycle costs.
3.5 Interchangeability. All manometers of the same classification furnished with similar
options under a specific contract shall be identical to the extent necessary to insure
interchangeability of component parts, assemblies, accessories, and spare parts. All threaded
parts shall comply with FED-STD-H28.
3.6 Performance. The manometer shall indicate positive pressure, vacuum, and pressure
differentials in linear inches of indicator fluid. The manometer shall measure differential pressure
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