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NOV Mono equipment goes offshore to provide 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 MonoTM equipment has been selected by Wärtsilä Water Systems Ltd of Poole, 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,” comments Wärtsilä’s Projects Manager, Jeremy Freeman. “We know Mono’s equipment very well, and we would always consider it for a project of this kind.

“We also receive very proactive support from Mono, and this was another factor in our decision. Rather then just supplying pumps they look carefully at each specific application and suggest the most appropriate solution that will deliver the performance that’s required.”

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 efficient maceration of abrasive sludges, and are very effective in capturing irregular shaped objects, thanks to their 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.

The Muncher also features Mono’s EZstrip™ technology which allows the unit to be maintained in place, thus drastically reducing the maintenance time required and maximizing availability. 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 Ltd membrane bioreactor, provide a fluid transfer solution that will fit into the compact space of the platform, yet still perform reliably and efficiently at 2 bar pressure. Available in cast iron or stainless steel, and with a choice of rotor and stator materials for different applications, these high pressure pumps eliminate the need for a series of pumps when pumping over long distances or with high head requirements.

They offer a suction lift capability of over 8 metres, 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.

Mono has recently increased the strength of its offering to the global oil and gas industry by establishing a specialist Oil and Gas office in Southampton, UK. The team which operates from this base provides dedicated industry expertise and support for customers in many different areas of the global oil and gas sector.

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