Reverse engineering of machines
As computer-aided design (CAD) has become more popular, reverse engineering has become a viable method to create a 3D virtual model of an existing physical part for use in 3D CAD, CAM, CAE or other software. The reverse-engineering process involves measuring an object and then reconstructing it as a 3D model. The physical object can be measured using 3D scanning technologies like CMMs, laser scanners, structured light digitizers, or Industrial CT Scanning (computed tomography). The measured data alone, usually represented as a point cloud, lacks topological information and is therefore often processed and modeled into a more usable format such as a triangular-faced mesh, a set of NURBS surfaces, or a CAD model.
Reverse engineering is also used ...
Back Cover Arrangements
One of the major differences between the ANSI and API pump casings is in the manner in which the back cover is secured to the casing.
In the ANSI design shown in Figure 3, the back cover and gasket is held against the pump casing by the bearing frame adaptor, which is most frequently supplied in cast iron. This usually results in a gap between the mating faces of the frame adaptor and the pump casing that has the potential to permit uneven torquing of the bolts. This may cause a fracture of the adaptor in the event of a higher than normal pressurization of the casing by the process system.
The API design in Figure 4 bolts the back ...
The Service Considerations
In both the chemical and petrochemical industries, many of the liquids being pumped require more consideration than merely environmental damage and pumping efficiency and reliability. It is necessary to consider the aspect of personal safety. Therefore, the choice between the ANSI pump and the API pump must take into account the specific fluid properties as well as the operating conditions.
One of the main differences between these choices is predominantly a result of the differences in casing design ratings which are as follows:
ANSI Pump Rating 300 psig at 300 deg F
API Pump Rating 750 psig at 500 deg F
In view of these figures, it is apparent that the API pumps should be considered for higher pressure and temperature ...
Which Process Pump Should I Use, ANSI or API?
Over the last few months, my training schedule has taken me to a number of different plants that use both API pumps and ANSI pumps. It became apparent that, in a few cases, there seemed to be some confusion regarding the differences between these two process pump styles. This was causing users to purchase the less expensive ANSI pump when, in fact, the service really needed an API pump.
So let’s get practical. What’s the difference?
The ANSI Pump
The ANSI pump is designed and built to the dimensional standards of the American National Standards Institute. Over the years, the ANSI pump has become the preferred style of end suction pumps, not only for chemical ...