NPFC - MIL-I-20037
INDICATORS, SIGHT, LIQUID LEVEL, DIRECT/INDIRECT READING, TUBULAR GLASS/PLASTIC
| Organization: | NPFC |
| Publication Date: | 1 June 1984 |
| Status: | active |
| Page Count: | 13 |
scope:
This specification covers sight liquid level indicators of the direct and indirect reading type having tubular glass, clear polycarbonate or rigid polyvinyl chloride (PVC).
Sight glass indicators covered by this specification shall be designated in the following form (see 6.2.1):
SGI DIR A POLY PA Equipment Shut-off Sight glass designator Indication valve material Application (see 1.2.1) (see 1.2.2) (see 1.2.3) (see 1.2.4) (see 1.2.5)
The level indicator shall be designated as SGI - sight glass indicator.
The type of indication desired shall be specified follows:
DIR - Direct indication, the tank fluid level shall be visible in the glass or tube. IND - Indirect indication, the tank fluid level shall be contained in a sealed chamber and indicated by some other means such as a float or flag actuated by a magnet contained in a float in the fluid chamber.
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 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.
The sight glass indicators shall be equipped with a manual or automatic shut-off valve of the ball-check type depending on the type of indication specified. Valve type shall be designated as:
A - Automatic for direct indication.
M - Manual for indirect indication.
The tube material of direct reading sight glass indicators shall be designated as follows:
G/T - Glass with teflon heat shrink tube
POLY - Polycarbonate
PVC - Rigid polyvinyl chloride
The sight glass indicators may be used, but are not limited to, the following applications:
LA - Lubricating oil and air interface
PA - Potable water and air interface
DA - Diesel oil and air interface
JA - JP fuel and air interface
DFT - Deaerating feed tanks
FA - Feedwater and air interface
AG - Aviation gasoline
AFFF - Aqueous film forming fluid
intended Use:
Indirect indicators are for water and fuel service at working pressures of 300 lb/in2 and below, temperatures of 300°F and below, and for hi-shock applications.
Direct indicators... View More
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