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
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.