Thermal Expansion Computation

[mmmumuw]

Dear Sir,
How do we compute the thermal expansion of pump? Can we assume it as a solid body, so using the thermal coefficient of pump casing? Anyone have experience of this, please your help.
Cheers,
Muwardi

 

[mmmumuw]

I mean solid rigid body.

 

[25362]

Besides the right selection of the material of construction to stand corrosion-induced effects, including heat-liberated gases that may act as triggers of the corrosion process, high temperature pump applications have several special needs. Quoting from the following site and others on centrifugal pumps:


* A centerline design to compensate for thermal expansion.
* A jacketed stuffing box that isolates the fluid from the stuffing box contents by a carbon bushing to retard heat transfer.
* A cartridge seal design that allows open impeller adjustment after the pump has (gradually) come to operating temperature.
* A stainless steel shaft to retard heat transfer to the bearings.
* A method of cooling the bearing oil, but never the bearings.
* A coupling that will compensate for axial expansion.
* A "C" or "D" frame adapter to compensate for motor to driver misalignment.
* Pipe expansion joints or any other procedure to absorb any pipe thermal stresses which may cause an elastic distortion of the pump casing, with the various possible harmful consequences.

http://www.mcnallyinstitute.com/CDweb/troubleshooting/general-roubleshooting/gt001.htm