Difference b/w Closed Couple and MonoBlock Pump
Difference b/w Closed Couple and MonoBlock Pump
(OP)
I want to know is there any difference between close coupled and monoblock pump? what are the disadvantages of closed couple pump?
Thankyou
Thankyou





RE: Difference b/w Closed Couple and MonoBlock Pump
https://www.google.com/search?q=Images+of+a+close+...
A monoblock pump has one single shaft and no coupling.
https://www.google.com/search?q=Images+of+a+Monobl...
Sometimes its possible to do all the right things and still get bad results
RE: Difference b/w Closed Couple and MonoBlock Pump
I am confused because of the below mentioned answer
What is a close coupled pump?
A type of pump that involves an impeller as the central element of the motor component. The pump doesn’t have a separate coupling, and thus eliminate coupling alignment, one of the more expensive and time-consuming operations of pumps that aren’t close-coupled.
How do they work?
In a close coupled pump, the impeller is on the same shaft as the electric motor that drives the pump. The motor has a machined face on one end, which matches the face on the pump casing that is mounted against the motor face. The bearings that are in the motor must handle the forces generated by the pump, since it doesn’t have its own separate bearing housing.
What applications are they used?
The simplicity, versatility, and relatively low cost of this type of pump make them useful in many industries. They typically are used with relatively simple seals, so they are limited as to temperature and to relatively non corrosive liquids. Because the bearings are located in the motor, close couple pumps are limited in size to about 40-50 hp for most applications.
Other related Pump Types include: industrial pumps, horizontal split case pumps, process pump, chemical process pump.[/b]
Refrence: http://www.pumpscout.com/all-pump-types/close-coup...
what is your expert opinion sir?
Thank you.
RE: Difference b/w Closed Couple and MonoBlock Pump
Pumps can be categorized many ways including; Type (or Mechanical Design Configuration); Industry Application; Function; etc such as:
- industrial pumps - This is an "Application"
- horizontal split case pumps - "This is a Mechanical Design Configuration"
- process pump - This is an "Application"
- chemical process pump - This is an "Application"
- Booster Pump - This is a "Pump Function"
- Recycle Pump - This is a "Pump Function"
- Charge Pump - This is a "Pump Function"
- Single Stage Pump - "This is a Mechanical Design Configuration"
- Vertical Sump Pump - "This is a Mechanical Design Configuration"
- Inline Pump - "This is a Mechanical Design Configuration"
- Close Coupled Pump - "This is a Mechanical Design Configuration"
- Mono-block Pump - "This is a Mechanical Design Configuration"
- Can Pump - "This is a Mechanical Design Configuration"
- Waste Water Pump - "Industry Application"
It is a deep subject.
Sometimes its possible to do all the right things and still get bad results
RE: Difference b/w Closed Couple and MonoBlock Pump
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Difference b/w Closed Couple and MonoBlock Pump
Mono-block has the pump housing and motor housing as the same piece of metal, the pump cannot be removed.
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P.E. Metallurgy, Plymouth Tube
RE: Difference b/w Closed Couple and MonoBlock Pump
Close coupled disadvantages - have to remove pump and motor to perform maintenance, often have assembly/disassembly problems due to corrosion, some designs put hydraulic loads onto motor bearings (not always designed for this), most motors offer excessive axial movement causing seal compression issues.
Hope this helps
Ash Fenn
www.cdrpumps.co.uk
RE: Difference b/w Closed Couple and MonoBlock Pump
The little known secret in the industry, is that having a spacer coupling in between your pump and motor greatly increases the overall life of each. Plus it allows you to get full life out of both. It really comes back to upfront cost, cost of downtime, and cost of replacement.
When it comes to couplings we are always here to help.
WWW.PSCCOUPLINGS.COM
RE: Difference b/w Closed Couple and MonoBlock Pump
Our mono-block design of pump also includes an additional bearing for withstanding axial loads so not replying on the motor which of course results in a much longer operational life.
Our final option is a traditional end suction pump with both radial and axial thrust bearings, and we add a flange for close coupling a motor with traditional coupling but with the robustness of a long coupled DIN24256 pump, but with a degree of compactness, but certainly removing the need for laser alignment etc...
So, generally, buy cheap, buy twice, but hope this gives a bit of an insight into the options for you...
Ash Fenn
www.cdrpumps.co.uk
RE: Difference b/w Closed Couple and MonoBlock Pump
None of the above is news to pump manufacturers who will take the cheapest option meeting the specification, which likely involves running the pump somewhere near its curve. Abusing the pump and killing the bearings with excessive axial load won't find much sympathy from the manufacturer.
On motor overhauls - beware of the bottom-feeder motor overhaul shops who typically fit whatever bearing is cheapest on the assumption that you won't check. It is very embarassing for them when client-from-hell demands a newly-overhauled motor is opened up for a spot check and their cheap job is exposed. They only do it once.