High Pressure

TB-9-6685-330-35 Pressure Gages Differential (General) Manual
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TB 9-6685-330-35

j. Carefully open NITROGEN TANK VALVE (fig. 2) and adjust WATER PUMP

NITROGEN REGULATOR (fig. 2) for 75 psia displayed on the digital display panel of the

PNEUMATIC PRESSURE STANDARD.

k. Close the INLINE VALVE (fig. 2) and monitor the system for approximately 5

minutes to assure that there is no loss of pressure in the system.

NOTE

A solution of soap and water can be applied to each fitting to

check for leaks if they are persistent.

1. If there is no loss of pressure, turn off NITROGEN TANK VALVE (fig. 2) and

release the pressure via the VENT VALVE (fig. 2).

m. Remove the cap from the "T" fitting.

8. High Pressure

a. Performance Check

(1) Connect equipment as shown in figure 3.

(2) Connect TI to the system, only connect the HIGH PRESSURE SIDE (fig. 3) of

the TI and leave the LOW PRESSURE SIDE (fig. 3) open to the atmosphere.

(3) Open the INLINE VALVE (fig. 3) going to the HIGH PRESSURE SIDE (fig. 3)

and close the VENT VALVE (fig. 3).

(4) Adjust WATER PUMP NITROGEN REGULATOR (fig. 3) fully ccw.

(5) Open NITROGEN TANK VALVE (fig. 3) and adjust WATER PUMP

NITROGEN REGULATOR (fig. 3) to pressurize the system to 75 PERCENT OF FULL

SCALE, then carefully adjust WATER PUMP NITROGEN REGULATOR (fig. 3) for FULL

SCALE indication on the TI.

(6) Close the INLINE VALVE (fig. 3) going to the HIGH PRESSURE SIDE (fig. 3)

of the TI and monitor the TI for leaks.

(7) If the TI appears to lose pressure, check all fittings for leaks. If no leaks are

detected, the TI has a leak and should be replaced.

(8) If TI maintains a FULL-SCALE indication, fill in the calibration data sheet.

b. Adjustments. No adjustments can be made.