Gas Inlet

The safe choice in inlet valves for fuel gas conditioning systems.

The safe choice in inlet valves for fuel gas conditioning systems.

The gas inlet valve section, also known as the Emergency Shut Down (ESD) or Safety Shut Off Valve (SSOV) section, is a crucial safeguard system in any gas conditioning system. The inlet valve section can seal off the gas system from the gas supply pipe, to safeguard the entire downstream plant in case of an emergency. The ESD valve shuts off the gas supply automatically on a downstream alert, and can be opened or closed from a central control room or locally at the ESD valve. The fuel gas inlet design easily adapts to single line (1×100% gas flow), dual line (2×100% gas flow), or other configurations.

The upstream and downstream pressures of the inlet valve are equalized to prevent the ESD valve seals from excessive wear.

We use state of the art components to guarantee plant safety at all times. The main inlet valve allows pigs to pass through, and has various options in different makes and types of fail-safe actuators, including:

  • Electric Actuators, with fail-safe controls
  • Pneumatic Actuators, operated by instrument air or instrument gas which is conditioned at a take-off point downstream of the valve.
  • Gas-over-oil actuators, to allow reliable operation on sour and wet fuel gas.


Our inlet systems for gas treatment plants range from compact, self-controlled valves up to fully automatic systems that need only supervisory monitoring and operation from a control room.

The equipment is reliable by design to reduce the need for servicing. We can also help with preventive and predictive maintenance. The main valve can be isolated for maintenance, with the ‘system in a box’ skid design making for easy access.


Our innovative inlet designs for gas treatment plants maximize efficiency for lowest total cost of operation. For example, there’s no need for an external air source when our units are instrument-gas actuated.

We will optimize the pipe layout for minimum pressure loss too. We use the smallest possible pipe dimensions to create some of the industry’s most compact (and lowest cost) systems which can still easily maintain the required gas flow.

Other smart aspects are a main valve that can be isolated for maintenance, and that control features can offer single, double or triple redundancy.


The huge throughput’s of gas conditioning systems mean that small changes in layout or gas conditions like temperature and pressure can create significant changes in pressure losses. Your inlet system is therefore designed to suit the individual gas source and turbine. The ESD valve section will safeguard downstream equipment from sudden excessive changes in the gas flow that have the potential to damage downstream equipment.

Petrogas excels at designing the best layout for minimum pressure loss and so maximum gas flow for the available plot size. We adapt and optimize our designs to precise customer requirements, even down to the make and type of components.

Turbine operators can’t afford downtime, and our inlet systems can include double or triple redundancy for highest availability. Operation is automatic, with manual override using proven and reliable technology based on quality components from world-class suppliers.

Our inlet systems can be SIL (Safety Integrity Level) certified to your particular preferences. They can also be designed for harsh environments, and resist temperature extremes of -46°C to 100+°C and high concentrations of hydrogen sulphide and other pollutants.

Fuel Gas Inlet

Fuel Gas Inlet Section

Fuel Gas Inlet

Fuel Gas Inlet Section - 3D Design

Fuel Gas Inlet Section - 3D Design

Fuel Gas Inlet Section - 3D Design

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Gas Inlet


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