Pumps are required for working in different industry verticals. These pumps are useful for performing different kind of activities in these industries. They are so important, that some may even consider them as important as some stationary item. However, different industries will require varied type of pumps for their processes. This necessitates that varied pumps are designed and then manufactured for aiding these industries. This is where process pumps come into picture. Many companies manufacture such pumps with different construction details that are dependent on their use and need. All this led to the ANSI pump standards which are used for manufacturing such pumps.
What exactly is ANSI?
Let us first understand what the ANSI pump standard is. The full form of ANSI is American National Institute Pump standard. The American Voluntary standards were the base from where ANSI evolved. The nineteen fifties was the period when Manufacturing Chemist Association proposed the use of ANSI pumps. These standards prescribed the pumps having sets of dimensional inch standards which described envelope dimensions for centrifugal pumps.
|Low Flow ANSI Pumps – 1196LF series||ANSI Chemical Process Pumps – 1196 Series|
|Self Priming ANSI pumps – 1796-series||Close Coupled ANSI Pumps - 1296 Series|
People from the United States of America probably know that these kind of pumps are the only ones they will use. There are certain standard dimensions that can be found in this category. They are:
- Bolts held down by the pump location
- Centerline distance amongst discharge nozzle and suction
- Pump coupling height
You will find three standard lengths of these standard pumps as follows:
- 17.5 in
- 23.5 in
- 33.875 in
People in Europe are used to International Standards Organization (ISO) which is similar to ANSI while those from Germany are used to Deutsche Industrial Norm (DIN).
Some important issues and alteration talks associated with ANSI
The standards for ANSI have seen numerous revisions and alterations right from its inception. There are also talks to combine these standards with American Petroleum Institute (API) standards for creation of one single standard pattern for the centrifugal pumps all across America. This combination will result in a merger of issues that are inherent with both these standard types.
The primary issues with all this and also the similarity in standards is that both were being drafted for the packed pumps. The change related to the combination of these two standards is being considered for reflecting the accentuated mechanical seals usage. The obvious of all these changes is oversize boxes for stuffing being accepted. However, all said and done, there is still a long way for these standards to be streamlined. The committee for ANSI needs to finally accept the fact that pumps; especially short pumps having shafts of numbers L3/D4, is the right approach if the competitive approach is to be maintained.
Varied types of ANSI pumps
ANSI pump parts and the overall type of pumps varies. This is due to the fact that process pumps in themselves are a very huge category. This results in variation with regards to ANSI pump parts and their construction details. Some of these types are centrifugal heavy duty pumps which are primarily manufactured for moving fluids which can be corrosive, abrasive of highly volatile. The other kind of pumps may be the positive displacement ones.
These pumps are usually made from exotic metallurgy. This is so as they need to withstand abrasive and corrosive liquids that they may be exposed to. They may also be be made from plastics for use in semiconductor manufacturing applications, scientific research and medical research activities.
Most of the ANSI standard pumps employ designs that are single volute inside interior passages of their casing. This fact is especially evident in small sized pumps which involve rates that are low in flow. Such types also need specific low speeds of impellers.
ANSI pumps have B73.1 standard. Further, every pump has a size that is identical to the envelope dimensions. This is true for every manufacturer involved in the constructions of such pumps.
With the passage of years, one thing that is evident is that the ANSI pump has definitely garnered the liking of industries and is preferred by many with regards to end suction. This is due to applications for chemical processes and also because of lesser aggressive services. Further, the standard used for manufacturing these pumps renders dimensional interchangeability for them with regards to different manufacturers. Overall, they are the best choice with regards to suction.