Turning of the pump’s shaft
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The pump must be turned manually at the start of each shift, but the direction in which centrifugal pumps and screw pumps are turned manually is opposite. Can the steering wheel of the turntable be moved freely? This post was last edited by lxzzl on 2008-10-5 15:29]
The cranking speed is very low, and the number of revolutions is also small; therefore, it should be fine to crank the centrifugal pump in either direction. In some positive displacement pumps, such as Roots blowers, rotating the impellers in the reverse direction can cause backflow.
The requirement to turn a centrifugal pump manually should be done in the direction of operation; personally, I don’t think it has much impact. It is probably done to better check whether there is any sticking in the pump body and to prevent the impeller from becoming loose.
No. Some pumps use large-diameter single-spring mechanical seals, and reversing the direction of rotation can cause the seal to fail.
I’ve never heard that the rotation direction of centrifugal pumps and screw pumps is opposite to each other. Here, there’s no rule stating that the direction of rotation cannot be reversed; only that at least one and a half turns must be made during rotation.
Just turning the drum is possible in both directions
I’ve never heard of such a thing; it’s fine to turn the shaft.
There’s no major issue with turning the crank, as you only need to turn it manually by N*360+180 degrees each time – which is usually one and a half or two and a half turns. This post was last edited by yangjia0283 on 2008-10-3 13:44.]
I think it’s possible to turn the equipment in either direction during rotation, but turning it in the forward direction is better; at least one full circle should be turned. The purpose of this operation is to determine whether the equipment is running smoothly. If any resistance is felt during rotation, it’s necessary to check and address that issue
Reverse cranking of centrifugal pumps and screw pumps should not pose any problems, but it is important to ensure that the bearing housings and gearboxes are properly lubricated with oil. Cranking should not be done for a full circle; usually, a few circles followed by half a circle is sufficient.