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Screw pump 1

T

Thuba

Chemical
Nov 21, 2024
51
Attached is a screw pump with a motor coupled on the side. The pump shows the direction it should run,but that will require motor to run anticlockwise and does not pump. lt only pumps when the motor runs clockwise and the pump running wrong direction.20250507_040954.jpg
 

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Hi,
Check the manual and or ring the manufacturer.
Why will it be different from the past, your pump has been running for quite a while?
Weird to me.
Pierre
 
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10. ROTATION The M-Range of Industrial pumps is suitable for rotation in either direction, i.e. flow direction out either of the pump flanges. The bearing housing direction plate indicates the resultant flow path dependent on mainshaft rotation direction. Pump flow curves also indicate flow direction. NOTE: It is recommended product flow is directed out the “end cover” (opposite drive end) side of the pump in applications where: • Pressure above 10 bar is required (dependant on pump capabilities) • No suction lift is required. For Suction lift applications, delivery must be on gland.
 

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Vectrex said:
10. ROTATION The M-Range of Industrial pumps is suitable for rotation in either direction, i.e. flow direction out either of the pump flanges. The bearing housing direction plate indicates the resultant flow path dependent on mainshaft rotation direction. Pump flow curves also indicate flow direction. NOTE: It is recommended product flow is directed out the “end cover” (opposite drive end) side of the pump in applications where: • Pressure above 10 bar is required (dependant on pump capabilities) • No suction lift is required. For Suction lift applications, delivery must be on gland.
Click to expand...
Thank you sir, so for attached set up, the rotation should be the one shown on pump name plate(shown as red arrow)? And can we say we have suction lift here?
 

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pierreick said:
Hi,
Check the manual and or ring the manufacturer.
Why will it be different from the past, your pump has been running for quite a while?
Weird to me.
Pierre
Click to expand...
Hi Pierreick,
we modified the pump currently so as to have suction on the drive side. The pump is pump is working perfectly fine, as we tried the direction as per nameplate, but it didnt pump. We then reversed the pump direction and it didnt pump. So l am just questioning why it only pumps when we run it opposite to manufacture's guideline. Thanks
 
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Thuba said:
Hi Pierreick,
we modified the pump currently so as to have suction on the drive side. The pump is pump is working perfectly fine, as we tried the direction as per nameplate, but it didnt pump. We then reversed the pump direction and it didnt pump. So l am just questioning why it only pumps when we run it opposite to manufacture's guideline. Thanks
Click to expand...
Sorry but this makes no sense. It says it doesn't pump in either direction?

Also, this is not a screw pump, it's a progessive cavity pump which is quite different.

How is this connected to the fluid being moved?
 
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True, when l run it in the direction of the arrow, l get no flow. But once l run it in the other direction l get a flow!
 
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LittleInch said:
What is your connection? A non return valve maybe in the wrong place?
Click to expand...
Hi. There is no NRV, but thanks, l contacted the supplier, they assume their plates were incorrectly labelled, it should run anticlockwise looking from the drive side
 
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Vectrex said:
Well, it would not be the first time I've seen a manufacturer wrongly labeling something.
Click to expand...
true,such a big company. Find attached the pump curve they provided, showing anticlowise direction vs nameplate direction, clockwise
 

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