In centrifugal pumps, 32+53A is used; what is the reason why no circulation can be established in the inlet and outlet pipelines of the isolation tank during operation?
Thread Content
Why can’t a circulation be established in the inlet and outlet pipelines of the isolation tank?
1. Ensure that the liquid level in tank 53A is above the interface through which the isolation fluid enters the tank. 2. The vertical distance from the liquid level to the centerline of the pump shaft should be greater than or equal to 900 mm. 3. The horizontal distance between the tank and the pump shaft should be less than 1.2 m. 4. All pipelines should slope from the sealed end cover toward the high-point exhaust outlet ； The slope should be 40 millimeters per meter. 5. For pipes, 90° elbows are not used; 45° elbows can be employed, while for tubes, larger-diameter elbows are used. 6. Pump speed: For pumps with a speed of less than 1500 rpm, the pumping effect is poor. 7. The viscosity of the isolation fluid inside the tank is usually 5-15# mineral oil, ethanol, ethylene glycol aqueous solutions, etc.
The situation on site is intermittent – it works sometimes and not at other times! So there is no doubt about the piping issue