Natural gas compressor

biogaselectrically-poweredstationary

When the gas has to feed a burner or when a variable gas flow is required, a compact by-pass, directly bolted to the machine and connecting outlet and inlet ports, is a simple and effective solution. A suitable overpressure relief valve is fitted inside the compact by-pass. When the gas demand decreases, the outlet pressure increases, and, when the set pressure is reached, the overpressure relief valve starts to open and by-passes excess gas back to the blower suction. In case of low differential pressure, usually the compact bypass is capable of handling the full capacity of the blower and thus the machine can continue to run even if the downstream gas demand is reduced to zero. For higher differential pressures, where the use of a compact by-pass is not allowed because of the high temperature increase when the full capacity of the blower is by-passed back to the suction, the machine can be supplied with the overpressure relief valve fitted on an offtake at the outlet side. In that case the flanged valve discharge could be piped-back to the blower suction through a by-pass pipe long enough to allow for sufficient gas cooling. On request, we can also offer machines equipped with a suitable gas cooler at the blower outlet, with overpressure relief valve fitted in an offtake at the cooler outlet, and with the complete by-pass pipe back to the blower suction side. We can also offer automatic flow rate adjustment by means of pneumatic or electrically operated flow control valve, fitted in the by-pass line and controlled via the client process parameter discharge gas pressure.