The gas analyzer section measures the exact composition of gas streams.

The analyzer section reports the composition of gas streams and can measure or calculate the heat value, dew point, wobbe index and other values. The specific gas characteristics are needed for custody transfer payments or to fine-tune the operation of the gas turbine burner control unit to reach optimal performance in the turbine and other gas driven equipment.

The gas chromatagraph (GC) is used to separate and measure the analyze the compounds from the gas stream. A sample probe guides a small stream of gas, under reduced pressure,  to the gas analyzer. The analyzer cracks the gas sample into multiple components and measures each component to determine the exact gas composition. Waste gasses are vented to a safe location.

Buffering

The buffer consists of a compressor, a buffer volume and an outlet system (usually a heater and pressure reducing system). The goal is to store enough gas to keep the gas turbine running if the gas supply is interrupted. The buffer must provide gas for long enough to allow the turbine control system to perform actions like switching over to backup fuel (usually diesel), start pumps and adjust burner settings. Buffer volume is customized to each project, since each combination of gas pressure, consumption and composition requires a different volume.

Control system

The control system is build to customer specifications using a variety of hardware, including: the Programmable Logic Controllers, Input/Output cards, barrier computers, flow computers, relays, motor soft starters and UPS. These electrical components can be housed in a special conditioned container, with dimensions varying according to customer specifications.

Petrogas programs the software for the control system entirely in-house, customized to your processing equipment and project requirements.

Operators miss nothing with precise control across the full range of operating pressures and temperatures. When they need it, there’s remote assistance and diagnostics across the web.

The control panel can be operated locally, or remotely from another site. Petrogas can supply data communications to the control room.

Final run

The final run consists of a series of equipment that form the last line of defense to protect the Gas Turbine from foreign material. The final run section generally includes consumption flow metering, performance heating, filtering and a shutoff valve.

Gas filtration & separation

The filter separator removes foreign materials like debris, dust and liquids to prevent them from damaging downstream systems. We monitor any rising differential pressure between inlet- and outlet of the vessel, which indicates that the filter elements should be replaced.

We have worked with gas supplies having high acid and salt content, always conditioning the gas to give a clean dry stream to turbines for maximum up-time. Filters are automatically or manually drained, and there are various mounting orientations for easy operation.

Gas metering

Flow meters let you keep a close eye on the precise amount of gas being consumed. Volumetric or mass-flow meters monitor gas volumes for custody transfer (Sm3/Nm3, energy value in megajoules), gas turbine efficiency monitoring and/or quality control.

We can measure flows of 1 million Nm3/h and above with accuracies to within 0.1%. Automatic (hourly, daily, weekly) reporting can include pressure, temperature, and energy value per standard cubic meter for billing.

Heating

The gas temperature drops significantly when pressure is reduced for gas turbine consumption and can potentially freeze-up mechanical components. This so called Joule-Thomson-effect is countered by heating the gas prior to pressure let-down, this prevents liquid dropout from the gas if one of the components passes below its dew point. Strategically located sensors and switches monitor the design temperature, water level and pressure; safeguarding the entire system.

Any additional results of a risk assessment/hazard and operability study (Hazop) can be implemented in the control philosophy for each project section.

Gas inlet

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 line, 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.

Liquid filtration & separation

All contaminants are removed from the oil stream; basket strainers will remove the coarse debris, and coalescing filters will remove the fine solids & water. The strainers and filters can be installed in a 2×100% configuration, integrated switchover valves allow you to switch to the stand-by filter without interrupting the oil flow.

Liquid metering

Fuel Oil Metering, whether to measure tariff or consumption, is an important part of any system. Being brand independent and highly experienced, we can advise you on the most suitable metering method and supply you with the best possible solution for your particular situation.

Loading & unloading

Oil loading & unloading systems provide safe, clean and quick means to connect trucks or railway tank cars to the oil transfer system. The systems can be fitted with pumps, anti-spark provisions and tariff metering.

Pressure boosting

When there is a low inlet pressure on site, pressure boosting compressors can be installed in parallel with the heating and pressure-reduction sections. The pressure boosting compressors increase the fuel gas pressure to the levels required for gas turbines.  The pressure booster is integrated in our control narratives in close cooperation with well-known compressor suppliers.

Pressure Reducing

The pressure reduction section reduces the gas pressure to a stable level suitable for gas turbines. The actual pressure is being determined by self acting regulator valves. Remote set-point adjustment can fine tune the output pressure for each individual run, or force run switching for even wear on parts.

Pressure reducing components vary depending on pressure levels, pressure differences, and allowable pressure drop across the system for low inlet pressures.

Tranfer & forwarding

Fuel transfer systems distribute liquid fuels throughout your plant. Whether from transport unloading to storage, or from fuel conditioning to consumption, our fit-for-purpose systems ensure you will have your product at your disposal anytime, anywhere.

Venting & flaring

Our integrated line of pressure and vacuum relief vents, flame/detonation arresters and related vapor control devices are used primarily in process industries.