8
TABLE 4 – 4400H Trouble Shooting
Problem
Check IGCS Pressure Differential
Solution
High gas usage reading
If “M”* Monitor of Face Pressure - “F” Stuffing Box Pressure =
<2,4 bar (35 psi)
IGCS is dirty and cleaning or rebuild is required. IGCS may be purged
through the “M” port via a quick actuation of a ¼ turn valve.
>2,1 bar (30 psi)
Ensure seal is square to the pump shaft. Check barrier gas supply line
downstream of flow meter for leaks. Check “M”* port and instrumenta-
tion for leaks. Plan to rebuild seal - most commonly an O-Ring issue.
Low gas usage reading
If “M”* pressure - “F” Stuffing Box pressure =
<1,2 bar (18 psi)
Restore Barrier gas pressure
>1,5 bar (22 psi)
OK and ensure seal gland is not hot.
Product leaking out
If “B” Barrier gas pressure is:
>1,7 bar (25 psi) over “F” Stuffing Box pressure
Check shaft O-Ring, stuffing box gasket
<1,4 bar (20 psi) over “F” Stuffing Box pressure
Restore Barrier gas pressure and dry out seal
Pump loses prime
Gas Usage is:
High
Vent stuffing box to lower pressure
Normal
Operate to right of BEP
6.0
COMMISSIONING / EQUIPMENT START UP
7.0 DECOMMISSIONING / EQUIPMENT SHUT DOWN
8.0 SPARE PARTS
9.0 SEAL MAINTENANCE AND REBUILD
9.1 4400H Trouble Shooting
1. If possible, turn the shaft by hand to ensure free rotation with no shaft binding.
A slight drag may be found due to the seal faces but the shaft should rotate freely.
2. Ensure the pump is primed and all piping connections are correctly fitted and
fittings are leak-free. Fill and vent the equipment in accordance with the instructions
of the equipment manufacturer. Ensure barrier gas is connected and available to the
4400H gas seal. Confirm correct shaft rotation direction for the installed seal.
3. Before starting the equipment, ensure all nuts and screws are securely fastened.
4. Take all necessary precautions and follow normal safety procedures before starting
the equipment.
Ensure that the equipment is de-energized and de-pressurized. If the equipment
has been used on toxic or hazardous fluids, ensure that the equipment is correctly
decontaminated and made safe prior to commencing work. Ensure that the pump is
isolated and check that the stuffing box is drained from any fluid and pressure is fully
released. Dismantle the equipment according to the equipment instruction manual
and remove the seal in the reverse order to installation. In case of disposal, ensure the
local regulations and requirement for disposal or recycling of the different components
in the seal are adhered to.
Use only Chesterton original spare parts. Use of non-original spare parts represents
risk of failure, danger to persons/equipment and voids the product warranty.
Spare Parts Kit can be purchased from Chesterton, referencing the recorded seal
data from cover page.
In Gland Control System Rebuild/Spare Parts Kit must be ordered separate from
4400H TwinHybrid™ Gas Seal Rebuild/Spare Parts Kit. Reference the recorded seal
data from cover page when ordering IGCS Rebuild/Spare Parts Kit.
