MIL-DTL-16356E
3.4 Parts. A water gauge shall consist of the following parts:
a.
Gauge frames consisting of:
(1) Body sections containing water and steam chamber with stem, nipples, or tube assemblies.
(2) Coverplates.
(3) Glasses, mica shields, gaskets, and glass positioners or spacers, if used.
(4) Clamping device (spring cone washers, bolts and associated hardware).
b.
Top and bottom connectors (if separate from shut-off valves).
c.
Top and bottom shut-off valves.
d.
Drain valves (Types B and C only).
(NOTE: Drain valves for Type A gauges shall be purchased using 803-2177525 and 803-5184193. Flanged
connections provided for drain valves shall be compatible with Navy standard valve flanges.)
3.5 Threaded parts. Minimum commercial standards for threaded parts shall be in accordance with
FED-STD-H28.
3.6 Bolts, studs, nuts, and screws. Unless otherwise specified (see 6.2), lockwashers, bolts, studs, nuts, and cap
screws shall be in accordance with ASME B18.21.1, ASTM A193/A193M, ASTM A194/A194M, ASTM A307,
FF-S-85, FF-S-86, FF-S-92, FF-S-200, or MIL-DTL-1222, as applicable. Any of these units that fasten on the
moving parts or that may be subject to the vibration during operation shall be secured by a locking device. Body
studs and body stud nuts for valves to be phosphate coated in accordance with MIL-DTL-16232, Type Z, Class 3.
Zinc plating per ASTM B633, Type 1, Class 12 (salt spray test not required) is an allowed alternative.
Coating/plating is to be performed after machining threads to requirements. Minimum fits shall be UNC2A and 2B
in accordance with FED-STD-H28 for Type A. Studs shall be tack-welded to the body or assembly if minimum fits
are used. Alternate methods for Class I gauges can be used subject to Navy approval.
3.7 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts are
also interchangeable or reversible with regard to function, performance, and strength. Type B reflex glass is
excluded from reversible requirement despite interchangeability. Oblong gaskets for use on the pressure side and
coverplate side, that are identical except for thickness and material, may be supplied under Type C gasket
requirements (see 3.14.5).
3.8 Welding. Joining of steel parts of the frame bodies or valves by welding shall be required for Type A
gauges and optional for Types B and C. Such welding shall be in accordance with S9074-AR-GIB-010/278.
Acceptance standards of MIL-STD-2035, Class I shall apply. Weld fittings, where used, shall be in accordance with
MIL-STD-22.
3.9 Frame.
3.9.1 Frame body construction. Supplemental blowdown or support water columns shall not be used. When
more than one section is used in the frame, they shall not be connected in parallel, but shall have single steam and
water connections to the top and bottom fittings, respectively. Sections, if used, shall overlap vertically not more
than 2 inches nor less than 1½ inches. The glass of the frame bodies shall be held by a removable cover secured by
clamping devices sufficient in number to provide a steam-water tight joint against the pressure for which the gauge
is to be used (see 3.12.7 and 3.13.3). The cover shall be removable for replacement of glass sets in the insert
recesses. Tolerance of overall size of vision opening in the frame and cover shall be +⅛ inch, -0 inch. Width of
vision openings shall be not less than ½ inch. Material shall be carbon steel for pressure at least equal to that
specified in ASTM A105/A105M or grade WCB of ASTM A216/A216M.
3.9.2 Rigidity. The frame bodies and cover-plates shall be sufficiently rigid to withstand the applicable
pressure without dependence on overlapping parts of the cover or on the means of securing the covers to the frame.
3.9.3 Visibility. The lowest point of the visible portion of the gauge shall be at least 1½ inches above the lower
edge of the opening in the bottom fitting of the boiler drum, and the highest point of the visible portion shall be at
least 1½ inches below the upper edge of the opening in the top fitting to the boiler drum.
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