Operators of natural gas pipeline systems routinely reduce line pressure and discharge gas from pipeline sections to ensure safe working conditions during maintenance and repair activities.

A Pipeline Gas Blowdown System is used to quickly and safely remove gas from a blocked-in pipeline section. The Blowdown system allows an operator to quickly remove the gas from a large section of pipeline for repair or maintenance. The Blowdown system removes the moisture from the gas and reduces the blowdown noise to 85 dB A at 100 feet. A control valve on the inlet reduces the pressure of gas flow through the high efficiency separators, and a silencer reduces the exit noise level.

 

EN-FAB, Inc. has developed a modularized trailer unit for pipeline gas blowdown. The design provides for:

 

• Reduction of all possible pressures

 

• Measurement of gas flow rate

 

• Separation of gas, liquids, and solids

 

• Reduction of operating noise to a permissible level

 

• Removal of distasteful gas odorants utilizing a deodorizing medium

 

These trailers are designed for movement along difficult terrain and can be camouflaged to blend into the surroundings. Trailer design meets local transportation requirements.

 

Main Components

 

• Two (2) High efficiency separators

 

• Two (2) Pressure / Flow Control Valves

 

• Two (2) 8” RF Orifice Plate Holders

 

• One (1) Vent Natural Gas Blowdown Silencer

 

• Two (2) Pressure Indicating Controllers

 

• Two (2) Differential Pressure Indicating Controllers

 

• CO2 Fire Extinguisher System

 

• Two (2) Nitrogen Supply Assemblies

 

The system is designed for portability along the pipeline to selected sites for cleanup, blowdown, and maintenance requirements.