Higher pressures are often required for biogas cleanup, a variety of O&G tasks, or industrial processes. Ro-Flo’s low and high pressure models are flow-matched to enable 2 stages of compression utilizing a single drive. A high pressure model is matched to the discharged gas volume of a low pressure unit. This is typically accomplished by having the drive coupled to the 2nd stage compressor. The 2nd stage compressor is then coupled to the 1st stage compressor with both stages operating at the same rpm a shown in the illustration to the right.
2-Stage Systems Allow Far Greater Range
Variations on this standard setup include independent drives and Ro-Flo® models specifically selected to handle dissimilar flow requirements at different speeds. An intercooler and knockout vessel are typically required inter-stage to remove the heat of compression and any free liquids from the gas stream.
When Ro-Flo’s are configured as two stage systems for compression applications, they can produce gas discharge pressures as high as 150 psig (10.3 barg). In vacuum operation Ro-Flo’s achieve vacuum levels as low as 0.7 psia (5 kPa absolute).