COVER A.-LH 7L5730 - Caterpillar

Required Tools
Table 2
Required Tools Qty
BAK Type S36 Heater 1
Keysight Technologies U1733C LCR Meter 1
Traceable Hygrometer Thermometer Dew Point Meter Model 4085CC 1
Compressed Nitrogen 1
JC Carter Vent Nozzle 662600-1 1
Heater nozzle to JIC adapter (7/8” ID pip to 1” JIC) 1 Test Preparation
Before starting procedure check valve positions to ensure proper drying:
Valve 1: Closed
Valve 2: Closed
Valve 5: Closed
Valve 6: Closed
Valve 9: Closed
Illustration 1 g06312072
Depressurize/Empty LNG tank completely by opening tank isolation valve "Valve Tag 2". Close valve once the tank has no pressure left.Note: Stand clear of outlet port, tank will depressurize through this valve.
Illustration 2 g06312074
Check capacitance of LNG tank with the LCR meter, before drying process for a baseline reference.
Plug in leads to LCR meter and zero leads by depressing the "Null/Cal" button.
Then long hold the "Range/Auto" button until auto function is activated
Note the capacitance reading and units.
Disconnect the LCR meter.
Remove the inlet line that contains the SV2 for the heated air enter the tank with minimal back pressure. Set aside the section with SV2 and cap the ends to prevent debris and moisture from getting into section that was removed.
Illustration 3 g06312078
(1) Heater nozzle (outlet)
Illustration 4 g06312085
Add the valve to inlet port for isolation. Plumb the heater into the tank inlet port upstream from the valve.
Make sure that the heater is set to 0 until ready to heat the nitrogen.
Illustration 5 g06312087
Plumb the nitrogen into the back of the heater.
Make sure the valves "1, 2, 5, 6, and 9" are closed.Test Procedure
Illustration 6 g06312089
Open the added valve in front of the heater.
Turn up the supply nitrogen discharge pressure to 138 to 207 kPa (20to 30 psi).Note: The drying process may take several days depending on the amount of water in the tank, make sure to have sufficient nitrogen 10.
Slowly open the tank isolation valve "valve 2" until a steady stream of nitrogen is discharging from outlet port
Turn on the heater to MAX, 8. Be careful not to touch any tank shroud components from this point forward as plumbing will become extremely hot and could result in a burn.
Periodically measure the capacitance and see tread head downward towards 498 pF.Note: Be sure to zero LCR meter before every measurement, refer to
Illustration 7 g06312091
Once the capacitance reading is 498 +/- 20 pF, use dew point meter to measure moisture in tank. Place the dew point meter probe into the outlet port, hold steady for the dew point reading. Make sure that the gas is flowing for dew point reading. If dew point meter reads -40 C and level sensor is 498+/-20 pF, then the drying process is complete. If not, continue the drying process until BOTH requirements are met.
Turn off heater and shut off nitrogen supply.
With gloves close valve in front of heater.Note: The valve will be hot. Wear correct protective equipment to prevent burns
Close the tank isolation valve "valve 2".
Once tank has cooled, disconnect heater and valve and replace plumbing.
Illustration 8 g06312095
Attached the vent nozzle with nitrogen supply behind the nozzle, to use this as a nitrogen fill port.
Open the vent valve "valve 1" all