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NOV Mono equipment chosen as offshore sewage handling solution

Three TR Munchers and three Compact C range pumps from NOV Mono have been chosen for a demanding sewage handling operation in the Caspian Sea. They will be used to macerate and pump black water on a deep-water semi-submersible drilling rig which is located there.

The Mono equipment has been selected by Wärtsilä Water Systems, which provides products and solutions for offshore facilities used in oil and gas exploration, development, and production, as well as marine vessels.

'The equipment we provide for a project such as this will have to withstand some extremely harsh offshore conditions and comply with environmental legislation. So we need pumps and macerators that we can rely on,' says Wärtsilä's projects manager, Jeremy Freeman.

The Mono TR Munchers will be used to macerate the black and grey water produced on the platform, at a capacity of 8.8m3/h. They are designed specifically for the maceration of abrasive sludges, and are effective in capturing irregular shaped objects thanks to layback cutter shafts which are set at an angle to the incoming flow. The shafts operate at different speeds to tear apart any solids, while a cantilever shaft design reduces the number of wearing components by eliminating the need for bottom bearings and seals

Each Muncher also features Mono's EZstrip technology which allows the unit to be maintained in place, reducing the maintenance time required. Any rejected objects are allowed to fall into an easy-access waste trap which is set below the cutter stacks to prevent damage. Munchers can be supplied to comply with the ATEX Directive 94/9/EC for this type of hazardous area application.

The three Mono Compact C Range progressing cavity pumps, which operate with a Wärtsilä Water Systems membrane bioreactor, provide a fluid transfer solution that will fit into the compact space of the platform and still perform at 2 bar pressure. These high-pressure pumps available in cast iron or stainless steel, and with a choice of rotor and stator materials for different applications.

They offer a suction lift capability of over 8m and, in addition to applications such as this one, their positive displacement, progressing cavity action also makes the C Range pumps ideal for accurate process control and variable speed dosing duties. As with the TR Muncher, the Compact C Range pumps can be supplied to comply with the ATEX Directive 94/9/EC.