Flowserve Gas Barrier Control System
Experience In Motion
Installation
& Operation
Instructions
1 Introduction
1.1 Flowserve Gas Control Systems combine ow monitoring and control elements in a
self-contained, easy-to-use unit for successful operation of pressurized or unpressurized
Flowserve Gas Seals. Control System designs range from simple standard to complex
custom including various elements and panel designs per specic gas seal and application requirements. The purpose of this document is to provide general installation and
operation instructions while the Control System assembly drawing and Gas Seal assembly
drawing should be referenced for additional instructions or requirements.
1.2 Control System elements may include, but are not limited to, the following:
Filter/Regulator - regulates pressure and lters plant gas supply to the seal.
Pressure Indicator - indicates gas pressure supplied to the seal
Flow Indicator - indicates gas ow rate to the seal.
Check Valve - protects control system from product contamination during upset
pressure reversal.
Fixed Orice - restricts maximum ow rate to seal in the event of seal failure.
Maintenance Bypass Valve - three-way valve used to bypass control system with
temporary, secondary gas supply for maintenance of Control System.
Pressure Alarm/Switch - electronic sensor used to alarm at low gas pressure condition.
Flow Alarm/Switch - electronic sensor used to alarm at high gas ow rate conditions.
1.3 Control Systems are used with at least the following Flowserve Gas Seal types: GF-200,
GX-200, Bufferpac 982, MD-200, ML-200, Circpac MD, GSL, GSS and GSD.
2 Before Installation
2.1 See enclosed assembly drawing for Control System component reference and special
instructions. Review instructions on the Flowserve seal assembly drawing for additional
piping recommendations. For technical assistance contact your local Flowserve Representative or Authorized Distributor.
2.2 Review the minimum/maximum system pressures that might be encountered at the
following: A. Inlet Plant Nitrogen or Air supply to control system
B. Process (seal chamber) pressure (for Plan 74 systems)
C. Vapor/liquid collection system pressure (for Plan 72 systems)
2.3 Conrm that all connecting piping, ttings, indicators and accessories are rated properly.
2.4 Conrm the hazardous area classication where the Control System is to be installed.
Conrm that the equipment ordered meets the area classication.
2.5 Inspect all connections for dirt or contamination. Blow out all tubing with instrument air
or nitrogen.
2.6 Conrm that a plug or block valve has been installed in the seal drain connection.
3 Installation
3.1 Securely mount the Control System as close as possible to the Gas Seal such that line
losses are minimal. Especially when supplying segmented ring seals, measure line losses
(pressure drop) before completing nal piping to seal. Tighten all mounting hardware prior to
making any tubing connections.
The images of parts shown in these instructions may differ visually from the actual
parts due to manufacturing processes that do not affect the part function or quality.
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