MIL-DTL-16356E
3.12.2 Visibility and dimensional standards. Unless otherwise specified (see 6.2), the gauges shall have a
visibility of 18 inches. The gauges shall not use more than two sections for main boiler service.
3.12.3 Glass. Gauge glass shall be heat-resisting, tempered borosilicate, clearly transparent, and shall
withstand the minimum test requirements specified in 4.7.7. The glass shall be suitable for service conditions of
600 °F and 1500 psig when protected by a mica shield. Glass shall be plain and shall be for use with steam at
1500 psig for Type A, Class I and II, and Class IV gauges as specified in 1.2. Gauge glass shall be indelibly marked
on the side with manufacturers name and "1500 HP STEAM."
3.12.3.1 Shape and dimensions. Unless otherwise specified (see 6.2), 1500 psig glass shall be shaped as shown
on figure 1 and shall be 1.313+0.035, -0.007 inches wide, 0.688+0.000, -0.004 inch thick, and of the length, L, in
inches as shown in table IV. Metric measurements are for information and identification only. Both ends shall be
rounded to a semicircle of a radius equal to one-half of the width. Glass shall have a bevel 1/16±1/32 inch wide by
45 degrees nominal around entire perimeter of both flat faces (see figure 1). To facilitate removal of the glass from
its mold, a draft angle of as much as 1 degree is permitted on the sides (see end view on figure 1). In this case,
dimensions shall be measured at their maximum width and length.
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