Hermetic Pumps seal-less design for CO2 pumping

When pumping CO2 in a liquid form, installers and users must be aware of the difficulties that this liquid presents: Cliff Warne of Axflow explains the potential problems in pumping CO2

Firstly, CO2 is a very low viscosity product, so with a conventional mechanical seal pump, leakage can occur across the faces of the mechanical seal resulting in gas escaping into the atmosphere.

Secondly, ice forms on the pump components and this can cause the mechanical seals to freeze, resulting in pump failure.

For these reasons the optimal approach should be by the installation of a seal-less or canned pump.

The double containment design, free of a shaft sealing device, makes the canned motor pump one hundred percent leak free.

Furthermore, the absence of mechanical seals and the employment of maintenance free slide bearings, as opposed to roller bearings, ensure optimised MTBF (Mean Time Between Failure).

Hermetic Pumps is a specialist in the design and manufacture of hermetically sealed centrifugal pumps for difficult pumping applications.

Recognized worldwide by all major chemical manufacturers, its pumps can be relied upon to contain some of the most toxic chemicals.

Hermetic has taken decades of experience in handling toxic liquids and applied this technology to its refrigeration pump range.

Its refrigeration pumps are of mono-bloc design (pump and motor share a common shaft) and as such are quieter, more compact and easier to install than conventional pumps.

They do not require a base plate, couple or coupling guard, nor is there a need for alignment of motor and pump to ensure totally leak-free operation.

Where applications require a low flow, high differential pressure Hermetic offer its CAM and CAMR models, which are built with multiple impellers to accommodate such duties.

For high flow and low differential pressure applications Hermetic has the CNF series, which differs in that it is a single stage pump.

With the use of high tensile tie bolts and high pressure casings, system pressures in excess of 1000 bar can be contained by Hermetic pumps GTMS, Feedthrough.