811 ANSI Series Pumps 

Griswold ANSI Series Pumps

• What is an ANSI B73.1 centrifugal pump used for in industrial applications?

  ANSI B73.1 pumps are a type of centrifugal pump designed to meet rigorous industrial standards. An ANSI B73.1 pump is a Hydraulic Institute type OH1, horizontal, end suction, top discharge, overhung impeller centrifugal pump. These pumps ensure pump-for-pump dimensional interchangeability among different manufacturers. Replacement pumps can be installed without re-piping. ANSI pumps also ensure that a common engineering specification is met when manufacturing, resulting in a pump that is suitable for severe-duty process applications.

• What are the benefits of centrifugal pumps vs. positive displacement pumps?

  In general, centrifugal pumps will have higher flow rates than positive displacement pumps and will be more efficient when operating in high flow, low viscosity applications. Centrifugal pumps will also have no pulsation or surges without the need for pulsation dampeners. Centrifugal pumps generally have a simpler design and fewer moving parts, resulting in a lower mean time between repairs and lower maintenance costs than positive displacement pumps.

• How to choose between a centrifugal pump and a positive displacement pump for your application?

  Centrifugal pumps and positive displacement pumps have different benefits and uses for specific applications. If you need an efficient way to move a high volume of low viscosity fluids, a centrifugal pump would be the best option. Positive displacement pumps can offer specific benefits for niche applications like flow accuracy, low shear or the ability to pump high viscosity fluids.

• What is the total cost of ownership (TCO) of a centrifugal pump system?

  When evaluating the total cost of ownership for a centrifugal pump, consider purchase, installation, energy use and maintenance. Total cost of ownership (TCO) includes the purchase price of the pump and piping, installation costs and commissioning, operational costs including energy costs, personnel costs and facility costs, maintenance costs including regularly scheduled maintenance, repairs and downtime, and replacement and disposal costs including the cost of a replacement unit and any environmentally related disposal fees.

• What are the warning signs of centrifugal pump failure?

  Signs of a failing centrifugal pump include high noise levels, which can indicate cavitation or defective or worn bearings, unusually high temperatures, which can also indicate defective bearings or system deficiencies such as closed or stuck valves or possible operator error, and a drop in performance, which can indicate a worn or damaged impeller or can also mean that cavitation is occurring.