1. Preparations and precautions before startup
a. Comprehensively check whether the mechanical seal, accessory device and pipeline installation are complete and meet the technical requirements.
b. Static pressure test shall be carried out before the start of mechanical seal to check whether there is leakage of mechanical seal. If there are many leaks, the causes shall be found out and eliminated. If it is still invalid, it shall be disassembled, checked and reinstalled. The general static pressure test pressure is 2-3kg / cm2.
c. Turn the pump to check whether it is light and even. If the turning gear is hard or immovable, check whether the assembly size is wrong and whether the installation is reasonable.
2. Installation and shutdown
a. Keep the sealing chamber full of liquid before starting. When transporting the solidified medium, the sealing chamber shall be heated by steam to melt the medium. Before start-up, the turning gear must be turned to prevent the soft ring from breaking due to sudden start-up.
b. For the mechanical seal using the oil sealing system outside the pump, the oil sealing system shall be started first. Stop the oil sealing system at last after shutdown.
c. After the hot oil pump is stopped, the cooling water of the oil sealing cavity and the end face seal cannot be stopped immediately. The cooling water can only be stopped when the oil temperature at the end face seal drops below 80 degrees, so as to avoid damaging the sealing parts.
a. If there is slight leakage after the pump is started, it shall be observed for a period of time. If the leakage does not decrease after 4 hours of continuous operation, the pump shall be stopped for inspection.
b. The operating pressure of the pump shall be stable and the pressure fluctuation shall not be greater than 1kg / cm2.
c. During the operation of the pump, the phenomenon of evacuation shall be avoided to avoid dry friction of the sealing surface and damage of the seal.
d. Always check the sealing condition. During operation, when the leakage exceeds the standard, the heavy oil shall not be more than 5 drops / min, and the light oil shall not be more than 10 / min. if there is no improvement trend within 2-3 days, the pump shall be stopped to check the sealing device.