The variety of applications that can be accommodated by Moyno progressing cavity (PC) pumps is highlighted by an offshore application. Ten of Moyno's 2000 Series pumps were ordered for a new fleet of offshore supply vessels.
The 2000 Series pumps will be fitted to HOS MAX 320 supply vessels which Mississippi-based VT Halter Marine is building for Hornbeck Offshore. The pumps will transfer up to 24-pound liquid mud to and from the vessels, which will be off-loaded when they reach the drilling rigs.
The ability to operate at sea was an important consideration. For example, centrifugal pumps require a fairly stable level of pumped media to work efficiently. The motion of the sea can cause the mud levels in the vessels to fluctuate, and this would reduce the efficiency of a centrifugal pump. The progressing cavity action of the Moyno pumps is not affected by changing mud levels. This allows the vessel operator to accurately predict the time needed to off-load and get back to shore.
"In addition to these predictable off-load times, our 2000 Series pumps are also well-proven in this type of challenging duty," said Moyno's Chip Strickland. "They offer the high volume and high pressure capabilities which the customer requires, plus the ability to operate in reverse so that mud levels in the tanks can be adjusted to add extra stability while the vessels are at sea."
Moyno says its 2000 Series pumps offer a combination of low maintenance, minimal downtime, and long service life, which all combine to create a low cost of ownership. Their proprietary 2000 Series gear-type universal joint design minimizes wear and accommodates both radial and thrust loads. This allows the pumps to handle abrasive materials with over 80% solids, while still maintaining a steady and consistent flow. The 2000 Series range also offers performance capabilities to 4,500 GPM, with pressure to 1,500 psi. The pumps for the Hornbeck vessels will transfer mud at volumes up to 1,000 GPM, handling pressures of 200 psi
Both cast iron and stainless steel models are available, with a choice of materials and coatings for rotors and stators, to suit individual applications.
"The 2000 Series pumps also have a low running speed capability which extends both the maintenance intervals and the overall working life. That pays particular dividends on an application like this where the pumped media is so abrasive," concluded Strickland.
The pumps will transfer mud at volumes up to 1,000 GPM, handling pressures of 200 psi. The order was secured through Moyno's partner company, Schematic Engineered Equipment.
