Centrifugal pump OEMs declare they provide better elements, service, response and worth than aftermarket service firms, but that isn’t always the case.
Until the early 1990s, OEM restore facilities worked solely on their products, espousing the mantra, “We know our products finest.” During the ‘90s, a lower in new product gross sales caused OEMs to change their story and boast that their outlets might work on any model of centrifugal pump. Suddenly, their particular product knowledge utilized to all centrifugal pumps.
According to the web magazine, World Pumps, six of the main U.S. centrifugal pump manufacturers of the 1980s have been consolidated into one, Flowserve. Many U.S. legacy brands are still manufactured by Flowserve. During ขนาดpressuregauge and acquisitions, the us Department of Justice forced the sale of some brands to other producers. Products had been disassociated from their designers.
Before the good consolidation, every OEM had a chief engineer and several product designers who employed a holistic design process, which thought of the entire product, the interaction of its numerous elements, the user’s software and business specifications. When a person had a big problem, the chief engineer was referred to as to sort it out. The lessons realized had been incorporated into future designs and centrifugal pumps developed over a few years.
Industry standards, API 610 in particular, were developed by customers to simplify procurement of high quality tools and to enhance pump reliability. It is a compendium of users’ experiences, that are usually costly experiences. API 610 captures solutions to common centrifugal pump design issues and best-in-class design features.
Computers loaded with superb software have democratized engineering. When I was a design engineering manager at Pacific Pumps, I had physicists, mathematicians, metallurgists, engineers, drafters, doc managers and a big staff of people to create and distribute microfilm. In the early Eighties, we added a Fortran programmer to our employees. Today, that talent and heaps of skill units are on my desktop. Integral calculus is completed with a click in MathCAD. Finite component analysis of constructions, pressure vessels and even shaft keyways are integrated into our strong modelers. Hydraulic part design software feeds computational fluid dynamics evaluation programs, decreasing hydraulic design threat. Rotordynamic analysis software program coupled with structural analysis instruments solves — and hopefully prevents — vibration issues.
3D optical scanners and laser trackers present correct models of advanced shapes. Conhagen can duplicate any pump case in a single afternoon and enhance it by the next week. It can produce a new case or impeller casting in five or six weeks. The growth of patternless molds — 3D printed sand molds — was the game changer for Conhagen, yielding high constancy, affordable value and fast delivery in most any metal.
Conhagen has advanced from a restore shop to a manufacturer that designs new centrifugal pumps or modifies existing pumps for particular applications. Unique designs present the necessary hydraulic performance and mechanical robustness to attenuate the total cost of ownership. Two examples of case replacements are included on this editorial — a 4 stage, axial break up, boiler feed pump’s carbon metal case was changed with a CA6NM casting. The second instance is a single stage between a bearings pump that suffered rotor dynamics points. Conhagen designed and manufactured a new case, shortening the distance between bearings from 37 3/4 inches to 30 5/8 inches.
Conhagen has been in business for 80 years. Its products include detailed engineering calculations, manufacturing drawings, installation, operation and maintenance manuals, a one-year operation warranty and support for administration of change reviews. It is big enough to be accountable, but sufficiently small to be responsive.
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