Production • Processing • Handling
Double acting diaphragm pumps save space
Limited space on rigs and floating production, storage and offloading (FPSO) units requires compact design of any machinery. Rainer Schmid reports.
C
onsidering the number of pumps required in various applications makes designs with increased efficiency and pumping power in a reduced footprint and weight appealing options to the
oil and gas industry.
Why a diaphragm pump? Diaphragm pumps are widely used in the oil and gas industry across much of the supply chain for pumping fluids and injecting chemicals. Tey are appealing because they provide precise injection of chemicals and can handle aggressive and harmful fluids safely. Hermetically sealed diaphragm pumps provide leak-free operation combined with the advantages and accuracy of reciprocating plunger pump technology.
Te design principle of plunger pumps means they cannot be operated leak-free unless equipped
with sophisticated lubrication, flushing and sealed drainage systems. Diaphragm pumps overcome all these draw-backs as the diaphragm separates pumped liquids from the atmosphere as well as from its hydraulic drive mechanism. Te diaphragm in a hydraulically operated diaphragm pump moves with hydraulic oil which is pushed backwards and forwards using a plunger. As the diaphragm moves backwards it increases the volume inside the pumping chamber, creating a suction effect and opening the inlet valve. Equally, as the diaphragm moves forwards it reduces the volume in the pump which opens the outlet valve and pushes the liquid out.
As such the diaphragm fulfils two major functions: Firstly, transmitting the reciprocating motion of the drive and secondly sealing the liquid from the outside. Apart from the diaphragm, the only moving parts of the pump in contact with the
Fig. 1. The NOVADOS B pump with a double acting diaphragm pump head.
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