A regulator with two functions
3rd Quarter 2012
Pneumatic systems & components
FCE Technical Services has released the PBE-L pressure build and economiser regulator, which functions as both a pressure build regulator and an economiser relief regulator in one model. Widely used for pressure control in liquefied gas storage tanks, it has a compact, forged body and a maximum Cv of 2. The pressure build feature controls the outlet pressure while the economiser feature relieves any excess pressure in the system above set point from atmospheric to 4100 kPa.
In the pressure build portion of the regulator, gas flows out of the bottom of the tank through the regulator and then through a heat exchanger that vaporises the liquid. The vapour is piped back to the top of the tank, causing the pressure to rise. When the pressure reaches the set point of the regulator it shuts off, stopping the flow of liquid.
If the gas is not used there may be a slight over-pressure above set point in the tank due to spontaneous boil-off. The regulator has an economiser feature built into it, so called because if the overpressure were allowed to continue to the safety relief range it would evacuate the whole tank. This relieves the excess pressure and maintains the set point.
It is important to know that the difference between the set point and the relief point is between 70 kPa and 170 kPa. If a unit is set at say 345 kPa then the relief would begin at 415 kPa and if the set point were 1725 kPa, relief would be at about 1900 kPa. This difference in pressure is inherent in the regulator and is not adjustable.
For more information contact Loraine Lundall, FCE Technical Services, +27 (0)12 808 0142, [email protected], www.fcets.co.za
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