【Daily Question】11.18 True or False The preheating rate of a hot oil pump is ≮50°C/h. （ ）

The preheating rate of the hot oil pump is ≮50°C/h. ( × )

Daily Question】11.18 True or False: The preheating rate of a hot oil pump is ≮50°C/h. ( Wrong

Daily Question】11.18 True or False: The preheating rate of a hot oil pump is ≮50°C/h. ( Wrong

Daily Question】11.18 True or False: The preheating rate of a hot oil pump is ≮50°C/h. ( Wrong

11.18 True or False: The preheating rate of a hot oil pump is ≮ 50°C/h. True

The preheating rate of the hot oil pump is ≮50°C/h. ( X ) The hot oil pump must be preheated before starting, and oil should be introduced slowly to prevent the pump from reversing. The preheating time should be no less than 1 hour. The preheating procedure is as follows: 1. Slightly open the pump inlet valve and the pump outlet vent valve to drain any water and gas present in the pump; once oil appears, close the vent valve. 2. Open the pump inlet valve and the pump preheating bypass valve (or gradually open the pump outlet valve in several steps) to increase the circulation volume of oil inside the pump, thereby controlling a slow rise in the pump’s temperature. At the same time, turn the pump shaft manually every 15 minutes; ensure that cooling water is supplied to all relevant parts before starting the preheating process. 3 After thorough preheating, the pump can be started or put into normal standby mode only when the temperature difference between the pump body and the medium is less than 60°C. For 4 pairs of pumps that are normally shut down and have not been overhauled, step 1 can be omitted during preheating. Preheating notes: 1. Make sure to check that the preheating process is smooth to avoid pressure buildup. If pressure forcing is detected, the pump preheating bypass valve and the pump outlet valve should be closed immediately; after purging the pump body with purge steam, the pump preheating bypass valve can be slowly opened. 2. The preheating rate should be around 50°C per hour. The flow rate of oil inside the pump should not be increased too rapidly or to excessive levels, in order to avoid vacuum conditions in the pump as well as leaks or reverse rotation of the pump due to too rapid temperature rise. It is advisable that the temperature at the pump’s flange differ from the temperature of the medium being transported by no more than 40°C. 3 During the preheating process, the pump shaft should be rotated 180 degrees every 15 minutes to prevent bending due to uneven heating. It is also important to check whether the rotation is smooth; if the force required for rotation varies, the speed of rotation should be increased. 4 The preheating must be even; it should not be cold at the top and hot at the bottom, or hot in the front and cold at the back, nor should any part be overheated.

The preheating rate of the hot oil pump is ≮50°C/h. ( Wrong )

The preheating rate of the hot oil pump is ≮50°C/h. ( Wrong )

The preheating rate of the hot oil pump is ≮50°C/h. ( Wrong )

Preheating speed of the hot oil pump ≮ 50°C/h ×