Power Generation

No one offers a higher quality EHC pump for your EHC system.

Baseline units to Peak Demand units (Peakers), Steam Turbines and Oil/Gas turbines…RMH has the Denison pump you need…IN STOCK for immediate shipment!!

Rocky Mountain Hydrostatics has been supplying remanufactured EHC pumps to the power generation industry for years. We have specialized in Denison pumps, mainly the PV09 model for the GE steam turbine market and the PXX1223 model for the Frame-7 multi-fuel market, but we have the experience in servicing ALL EHC pumps, from the small Classic Vickers (PV2032 and PV2050 are good examples) all the way up the LARGE PVA-120. RMH will deliver the absolute highest quality product money can buy.

We don’t cut corners on our product like our competitors do. Here are some points you should consider when you have your pump rebuilt from someone other than RMH.

PV09…All Models

RMH knows that the hangar “swash-plate” can sometimes be damaged by high frequency vibrations in the pump. There are 4 “ears” that support a pin/roller assembly that the pressure/volume control push against during normal operation and volume cycling (valve test). These “ears” are directly cast as protrusions on the basic body of the hangar. The holes that are drilled into these “ears” to support the pin/roller assembly sometimes wear oversize, allowing the pin move freely.

Our competitors fix this by drilling out the holes and installing sleeves. This allows them to re-use the hangar. What they don’t realize is by drilling out the holes and installing sleeves, they have actually removed critical support material, and have made the “ears” weaker, thus reducing the life of the part significantly.

RMH has had a solution for years, which involves the removal of the ears completely in a CNC Vertical Machining Center, and cutting a pocket where a new “ear” assembly (made from 4340, heat treated for superior life vs. the iron casting) is installed with 6 socket/button head screws. The screws are then tack-welded in place, to eliminate ANY possibility of coming out. The ears on the “bolt on assembly” are wider (more surface area, more resistance to wearing), and are harder. We have never seen a modified hangar require a new ear assembly. The cost of this modification is so negligible, that we include it into every pump we ship.

CLICK HERE FOR A PAGE OF PICTURES OF THIS MODIFICATION, AND OTHER ITEMS OF INTEREST

PV09 All Models

RMH does not purchase aftermarket parts. This includes parts made in Canada, which seems to be the most prevalent supplier of parts for these pumps. We have seen these parts in pump core returns many times. We have tested some of these parts for proper metallurgy, heat-treat hardness, and dimensional tolerances. What we have found could be defined as alarming….pistons made of the wrong alloy, slipper shoes with improper dimensions (resulting in incorrect hydrostatic balance), slipper shoes made of the wrong bronze, and cylinder block sleeves bored to the wrong bore-circle dimension.

How does RMH know all of this? Because we have OEM data to use as a baseline for comparison.

PXX1223 609 R1P X844 (Fuel Pump for Frame-7 Turbines)

This pump is VERY special, even though it’s basic design is derived from the very successful marine/industrial duty 60 Series Denison pump.

For starters, the cylinder block is made of a special alloy. This alloy is NOT the same forged bronze used in the “standard” hydraulic service 60 Series pumps that Denison sold throughout the world. This alloy is only available as a casting, and has a much higher percentage of copper, due to the type of fluid the pump pumps (fuel oil, kerosene, diesel, or any other type of fuel/fluid that has a LOW viscosity). Many rebuilders simply use a “standard” cylinder block. This can work, until the pump gets hot. The fluid viscosity becomes too low, the piston bodies contact the cylinder walls, the pistons heat, expand, and then seize. Pulled slipper shoes are the result. This is the most significant difference this pump has compared to a standard pump, but read on for some more good information about this fuel pump.

CLICK HERE FOR A PAGE OF PICTURES OF ONE OF THESE PUMPS DURING TEARDOWN AND ASSEMBLY

Here are some other points to ponder when considering a company to rebuilt or service your Denison PXX1223 609 R1P X844 fuel pump…

  • The piston slippers are also of a special design for use with the special fluid used.
  • The shaft bearings are of a special tolerance class, due to the coupling used by GE.
  • The condition of the control cylinder assemblies is critical because the servo system (fuel volume control) hydraulic fluid IS NOT THE SAME AS THE FUEL. These cylinder assemblies isolate the servo system from the fuel. RMH replaces these liners EVERY time we service this type of pump.
  • The servo-valve used on this pump is reliable, but most pump rebuilders do not service the valve as part of a pump repair. RMH stocks these valves and a valve exchange can be included in the quote if the customer requests it.
  • The RVDT enclosures are supposed to be “intrinsically safe”…meaning air-tight. RMH has seen many pumps where the gaskets were simply not there on dis-assembly.
  • Denison has effectively walked away from this very special market. RMH recognized this many years ago and purchased all spare parts inventories available. RMH owns 6 pumps…two complete with controls, and 4 basic pumps without controls. This enables RMH to ship a pump immediately for a down-time situation, and to do a 1 week “exchange” of a pump when a turbine out of service for a schedule outage.
  • RMH also stocks NEW and remanufactured RVDT’s. This way, we can avoid the 26 week lead-time of this critical part.
  • Can the company test the pump to the factory test specifications?
  • Does the company have many pumps in service in many plants, with customers that have high praise for the product.

RMH does!!

We understand the loss of revenue from the turbine going offline due to a pump failure, AND other associated costs as the company now has to PURCHASE power from the grid at peak market costs to satisfy demand. That is why we will NEVER sacrifice quality for any reason. That is why we have a 750 HP test stand that can test any pump from any EHC skid to confirm that quality before shipment.

Here are the Denison pumps we STOCK, the OEM part numbers, what type of turbine or application the pump is used and other information that you will surely find useful.

General Electric Steam Turbine EHC (Electro-Hydraulic Control) System Hydraulic Pumps

015-46094

PV09XS 053 31R 04 Y 2 S5

GE EHC PUMP, 53 GPM (GE PART # 155-B2439-P0001)

USE 015-46108 BELOW FOR EXCHANGE, AS THIS CODE INCLUDES THE FOOT-BRACKET AND SOCKET-WELD FLANGES, WHICH ARE USED ON NEW BUILD ONLY

015-46108

PV09XS 053 31R 04 S5

GE EHC PUMP 53 GPM (GE PART #
155-B2439-P0001)

SAME AS ABOVE, FOR EXCHANGE TO AN EXISTING INSTALLATION, DOES NOT INCLUDE FLANGES OR FOOT-BRACKET- RMH STOCK ITEM

015-28866

PV09YA 053 31R 04 Y 2 S5

USE 015-46108 ABOVE

OBSOLETE, INTERNAL PARTS ARE NOT SUPPORTED ANYMORE

015-29764

PV09YA 053 31R 04 S5

USE 015-46108 ABOVE

OBSOLETE, INTERNAL PARTS ARE NOT SUPPORTED ANYMORE

015-46095

PV09XS 032 31R YP Y 2 S5

GE EHC PUMP 32 GPM (GE PART # 155-B2439-P0003)

USE 015-46109 BELOW FOR EXCHANGE, AS THIS CODE INCLUDES THE FOOT-BRACKET AND SOCKET-WELD FLANGES, WHICH ARE USED ON NEW BUILD ONLY

015-46109

PV09XS 032 31R YP S5

GE EHC PUMP 32 GPM (GE PART #
155-B2439-P0003)

SAME AS ABOVE, FOR EXCHANGE TO AN EXISTING INSTALLATION, DOES NOT INCLUDE FLANGES OR FOOT-BRACKET-- RMH STOCK ITEM

015-29956

PV09YA 032 31R YP Y 2 S5

USE 015-46109 ABOVE

OBSOLETE, INTERNAL PARTS ARE NOT SUPPORTED ANYMORE

015-29955

PV09YA 032 31R YP S5

USE 015-46109 ABOVE

OBSOLETE, INTERNAL PARTS ARE NOT SUPPORTED ANYMORE

M15-20925

PXX1223 607 R1P X844

GE FRAME 7 FUEL PUMP (GE PART #
185-A1728-P001)

RMH STOCK ITEM

015-23381

PF05-002-31L-003

WESTINGHOUSE-TURNING GEAR LUBE-OIL PUMP

RMH STOCK ITEM

Click here to go to our Master Product page, so you can find the pump model number you need, then contact us (or click on the "Chat Live" button above) for more information!


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