Flowserve Gas Barrier Control System - Manual (Page 3)

3
3.2 Use 316 stainless steel tubing to connect the Plant Nitrogen or Air supply to the Supply Inlet
port of the Control System. Minimum recommended tubing sizes are as follows unless
otherwise specified:
3/8 inch for mechanical seals (e.g. GF-200, GX-200, ML-200, GSL, GSD)
1/2 inch for segmented ring seals up to 127 mm (5.000 inch) seal size (e.g. Circpac MD)
3/4 inch for segmented ring seals up to 254 mm (10.000 inch) seal size
Contact Flowserve for all other seal types or the use of smaller tubing sizes
3.3 Use same size 316 stainless steel tubing as Step 3.2 to connect the Supply Outlet of the
Control System to the inlet of the Gas Seal.
3.4 Special Components
Maintenance Bypass Valve
Two ports are available for piping connection. Connect the port labeled “To Seal” to the inlet
of the Gas Seal as indicated in Step 3.3. The port labeled “Bypass” is connected to a
temporary gas source when Control System maintenance is required. This port is otherwise
not used. Set the bypass valve to the “Normal” position during normal operation.
Pressure or Flow Alarms
Connect alarm wiring to plant system per NEC 500 and plant specifications.
4 Operation
4.1 Turn on the Nitrogen or Air supply to the Control System.
4.2 For Plan 74 pressurized systems:
Adjust the Pressure Regulator until the Pressure Gage reads a predetermined pressure
above the pressure of the product being sealed (seal chamber pressure), taking into
consideration all phases of equipment operation. Consult the Flowserve Gas Seal assembly
drawing for the recommended barrier pressure over product pressure.
For Plan 72 unpressurized systems:
Adjust the Pressure Regulator until the Pressure Indicator reads a predetermined
pressure typically nominally above atmospheric or vapor/liquid collection system pressure.
Consult the Flowserve Seal Assembly Drawing for the recommended buffer pressure.
4.3 If a flow switch was supplied, and no set point was specified at time of order, it is factory set
at 5 SCFH rising. Please refer to the flow switch literature included in the manual for the
proper procedure to reset the switch set point.
4.4 If a pressure switch was supplied, and no set point was specified at time of order, it is
factory set at 1 bar (15 psig) falling. Please refer to the pressure switch literature included in
the manual for the proper procedure to reset the switch set point.
Note: For Plan 74 systems, the pressure switch set point should be 1.2 bar (17 psig)
above the pressure of the product being sealed (seal chamber pressure). Example: If seal
chamber pressure is 1.7 bar (25 psig), the pressure switch set point should be 2.9 bar
(42 psi) falling.
4.5 Check all connections to and from the control system for leakage with a leak detection
solution or soapy water.
4.6 Maintain the seal gas pressure even when the pump is not running.
4.7 The equipment is now ready for start up.