This feature prevents excessive strain on the volute casing caused by thermal expansion or contraction. An oversize jacketed stuffing box Mechanical seals need lots of radial room to prevent the rotating portion of the seal from coming into contact with the stuffing box inside diameter. Adjusting the impeller clearance from the power end moves the mechanical seal setting. Pumps that adjust the impeller from the wet end are not common, but they are available.
Oil has a very low specific heat and poor thermal conductivity.
You should have at least a two-liter capacity. A sealed up bearing case You will need positive face seals to prevent the ingress of moisture. Be careful because this pressure can blow out some seal designs that have not been positively retained on the shaft and in the bearing housing 8. The impeller's specific speed number will help you determine if you have the correct impeller shape. The Duplex metals seem to be the preferred materials for modern pump impellers.