Tecnoforge-Gas Equipment.pdf - sge.com.sa

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Why an indirect HeaterIt is to be found in an economic justification. Thefluid carrying coils are operated at a maximumpressure of 3,000 psi. (depending on the customerrequirements), whereas the shell of the indirectheater containing the heat transfer medium (water)is operated usually at atmospheric pressure, or at avery little pressure above it, therefore it’s required athin wall vessel for the heater shell. In addition, alsothe firetube needs withstand only the atmosphericpressure plus a few pounds. It would be prohibitivefrom several standpoints to attempt to makefiretube to withstand the pressure of 3,000 psi aswell as the heater shell itself; thus the creation of theindirect type heater with fluid carrying high pressurecoils immersed in an atmospheric pressure waterbath heated by a firetube operating close to theatmospheric pressure.Gas HeaterWhat is an indirect HeaterAn indirect heater is an oilfield terminology for avessel complete with: a firetube (which is usuallyfired by natural gas), a fluid around the firetube(which is usually water) and, immersed in the fluid,a coil containing the fluid to be heated. The waterbath around the firetube is heated directly by havingcontact with the firetube and the coil containing thefluid to be heated is immersed in this hot water bath.Because there is an intermediate step of heattransfer between firetube and coil, the heater derivesits oilfield terminology of “indirect heater”.Use of the indirect HeaterNormally the natural gas is produced at highpressures ranging from 1,500 psi up to 3,000 psiand it’s usually transferred to sale gas lines thatoperate at 1,200 psi and below. The indirect heateris often employed to supply heat to a gas streamthat is being expanded from some elevated pressure(well head) to some intermediate pressure(intermediate production equipment) or to theactual sale line pressure. Heat supplied is used tocompensate for the Joule-Thompson effect of the gasthrough expansion.TECNOFORGE Systems reserves the right to change design, specification and materials without notice8
A most frequent applicationThe high pressure fluid is introduced to the heatingunit through a choke located at the heater inlet, andthe expansion takes place immediately inside theheater in the water bath. Then, as the fluid passesthrough the steel coils, it’s raised to the desiredoutlet temperature suitable to compensate theJoule-Thompson effect during the expansion. Thesteel coil, which is subject to the well head operatingpressure, is subject further to corrosion by the fluidcarried within the steel pipe as well as erosioncaused by the high velocity of the fluid itself. In timethe combination of corrosion and erosion takes itstoll in wall thickness of steel pipe.Features AvailableRemovable FiretubeRemovable Tube bundleLarge firetube combustion volume per square footof firetube areaQuality fabricationX-ray and stress relieving facilitiesAutomatic control, regulation and safety systemssuitable to operate also without electric power.High Performance and High EfficiencyDesigned and manufactured inaccordance to:API 12 KASME VIII9TECNOFORGE Systems reserves the right to change design, specification and materials without notice
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Tecnoforge-Gas Equipment.pdf - sge.com.sa

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