How CFD simulation provides one pump manufacturer with a virtual test facility.Our chopper pump is a centrifugal pump that utilizes a chopping action between the impeller and suction plate. These...
Q. Is it true that centrifugal pumps should be built with ball bearings that have greater than normal internal clearance?A. It depends on the pump type and the conditions of service for the...
1)  Only select pumps with suction specific speeds less than 11,000-less than 9,000 is even better.2)  Select your pump so it never operates below 70 percent to 80 percent of its best...
Q. What is the maximum pumped liquid temperature that an end suction centrifugal pump can handle, and what must be done to a pump for it to operate successfully at that temperature?A. Limits are...
In 1992, a pipeline was built in Texas and Oklahoma parallel to an existing line to increase capacity. The design flow rate was 3,600 gpm (818 m3/h). Four stage 8 X 10 X 13 pumps were purchased new...
Repairing multistage, segmental diffuser, boiler feed pumps and maintaining the original performance can be difficult and challenging. In this case study, a comprehensive inspection and repair program...
Say goodbye to concerns about pump seizure: By properly applying composite materials to a troublesome boiler feed water pump, this large process facility in Alberta can now run one pump during...
When choosing a rental pump, ask yourself the following question: Would you have a general practitioner perform your open-heart surgery? Hopefully, your answer would be no. While there is a place and...
Pumps & Systems, April 2008 Biofuel production is one of the fastest growing sectors of the energy industry. To reduce our dependence on finite energy sources such as petroleum fuels and decrease...
Electric Submersible Pump Technology Most producing oil fields utilize an electrically driven downhole pumping system to bring oil to the surface. The pump typically comprises several staged...
Some may question if this is an appropriate topic for a pump magazine. While I do admit that I am a staunch conservative, this column is not about the political left. Instead, it addresses a very...
The total energy consumption of industrial plants is a decisive factor for a successful, economic operation. While the energy costs were once the main motivation to reduce energy consumption,...
This month, we begin a five-part series called "Focus on Fundamentals." These back-to-basic tutorials explore different pump types, including various centrifugal and rotary pumps. Part One focuses on...
In the April issue, we discussed fundamentals of the overhung impeller centrifugal pump design. Its advantages are a single bearing housing and a single seal or packing, but an overhung impeller load...
Q. Is it true that centrifugal pumps should be built with ball bearings that have greater than normal internal clearance? A. It depends on the pump type and the conditions of service for the pump. ...
Q. We are operating a centrifugal pump, and a recent change in the system has resulted in a deficiency of about 5 to 10 percent in the rate of flow. Can anything be done to the pump to increase the...
Q. What does the expression discharge recirculation signify in rotodynamic (centrifugal) pumps? When does it occur, and is it harmful to the pump?   A. Discharge recirculation is circulatory...
Q.  When a centrifugal pump impeller is reduced in diameter to reduce total head and rate of flow, the affinity rules predict that the new rate of flow is equal to the original rate of flow times...
Q. We are expanding some of our buildings and need to replace the existing fire pumps. What are the technical requirements for such pumps?A. Pumps currently used for fire protection in buildings are...
Q. When installing a horizontal pump, is it better to grout the pump baseplate or let it float free?   Different sources provide opposing views on this subject.A. Whether to grout...
The number of compressor and pump package orders in the energy sector has increased greatly over previous years' level due to increased activity in the oil & gas production, transmission and...
The "Ten States Standards" and other municipal and state codes require submersible wastewater pumps to pass a minimum 3-in spherical solid. This is not a difficult task for many 4-in and larger...
In many cases, users rent pumps to help them meet specific project requirements. The user does not always want to purchase a pump because he may not have the knowledge, manpower or time to service and...
Last month we explored the effect of the system curve on the output of two identical centrifugal pumps operating in parallel. This month we will review several other factors that can also impact their...
Most industrial centrifugal pumps carry a significant capital equipment value. Maintaining them to run close to their best efficiency point (BEP) saves in downtime, repair costs, and overall power...
A recent call to troubleshoot a horizontally-split multistage pump reminded me of my good old days working for an OEM. When an OEM de-stages a standard design, an important engineering step is...
Pumps and pump systems are unique, engineered products that require specialized knowledge in all phases of repair, rebuilding and balancing. When pumps fail, costs add up quickly for repairs,...
As the cost and supply of fuel continues along its bumpy road, more emphasis has been placed on tapping into the remainder of the world's oil reserves. Canada is home to one of the world's two largest...
People often look at renting versus buying in the sense of how much it will cost. If it is a long-term project, it is possible and probable that rental fees will surpass the price of buying the pump....
When applying a centrifugal pump on abrasive service, there are a few things you should know about the application to pass on to the pump supplier. ...