TB 9-6920-430-50
CAUTION
Test gage in table 2 must be clean to prevent contamination of
Gas Pumping Unit (GPU). Gage must NEVER be calibrated
with oil. Calibrate ONLY with MIL-P-27415 (NSN 9135-00-
882-1793) Grade A Argon gas. ALWAYS backflush test gage
with freon prior to use until thoroughly clean. Failure to do so
5. Accessories Required. The
accessories listed in table 3
are used in this
calibration
procedure.
Table 2. Minimum Specifications of Equipment Required
Manufacturer, model and
Item
Nomenclature
Minimum use specifications
part number
A1
PRECISION TEST
Range: 0 to 10,000 psi
U.S. Gauge M/N 132274
GAGE
(7907650)
Accuracy: 50 psi, ascending
100 psi descending
Table 3. Accessories Required
Item
Common Name
Description and part number
B1
Adapter*
Adapter, Straight, 1/2" NPT to 1/2" OD tube, stainless steel, 37
degree flare (MS51503B8-8S or 8-8GTXSS)
B2
Reducer*
Reducer, 1/2" OD tube to 1/4" OD tube, stainless steel, 37 degree
B3
Nut*
Nut, 1/2" OD tube, stainless steel (MS51531B8S)
B4
Gas supply bottle**
CGA 677 (Argon gas: MIL-P-27415, Type 1, Grade A)
NSN 9135-00-88-882-1793
B5
Hose assembly, test**
B6
Hose assembly, test**
(11509720-001) NSN 4720-01-0990-3185 Length: 36 inches,
Quantity: 1
B7
Cross Assembly**
B8
Liquid**
B9
Tape, Anti-sieze*
*Provided
**Provided by site.
SECTION III
PRELIMINARY OPERATIONS
6. Preliminary Operations
a. The
instructions in
paragraphs 6 are 7 are preparatory to the
calibration process.
Personnel should become familiar with the entire bulletin before beginning the calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name and item identification number as listed in tables 2 and 3. For the identification of
equipment referenced by item numbers prefixed with A, see table 2 and for prefix B see
3