Rotate the shaft 2 1/4 turn weekly - API 686 - ?
Rotate the shaft 2 1/4 turn weekly - API 686 - ?
(OP)
Dear All,
I appreciate if anyone could clear me this doubt as i am very new to rotating equipments.
"mark the shaft and rotate 2 1/4 revolutions weekly as a part of preservation in all machinery's as per API-686".
In this statement, why the rotation is 2 1/4 turn. What is the specific reason?
Thanks in advance.
I appreciate if anyone could clear me this doubt as i am very new to rotating equipments.
"mark the shaft and rotate 2 1/4 revolutions weekly as a part of preservation in all machinery's as per API-686".
In this statement, why the rotation is 2 1/4 turn. What is the specific reason?
Thanks in advance.





RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
Rotating the shaft 2 turns ensures that it is free to rotate and prevents any oxidation (rust) buildup.
Rotating the shaft that last 1/4 turn means the orientation is changed so you don't get any "sag" in the shaft from being in one orientation for a long time.
Patricia Lougheed
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RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
The 2 1/4 turns is probably an effort to ensure that the shaft, or more accurately the bearing elements, do not come to rest in the same location after each rotation. Whether it is successful will depend on the bearing design.
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If we learn from our mistakes I'm getting a great education!
RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
The neeed to rotate a couple of times is to ensure the bearings are evenly coated with lubricant to prevent corrosion and the 1/4 turn is to put the static bearing load onto a different part of the bearing each time.
RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
Bill
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"Why not the best?"
Jimmy Carter
RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
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RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
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RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
I am really thankful to all of you. Its amazing to get such a worthy response.
I am satisfied with your inputs and thank you once again for sharing your knowledge.
RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
Good customer, so hey, thats life sometimes - made me laugh to myself however, as long term storgae and preservation procedures were tagged to the pump...
Customer is king !!!!
Ash Fenn
www.cdrpumps.co.uk
RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
Reminds me of a call from the customer some years back:
Customer. "We started the pump, the motor goes round but the pump doesn't"
Me. being one step ahead and guessing what had happend:
"Did you check the coupling alignment and motor direction before starting the pump" Trying to not laugh.
C. "of course"
Me. I suggest you re-check everything, as the pump was shipped without the spacer coupling fitted so that is probably why the motor goes round and the pump doesn't"
C. "Oh"
Heard back a few days later from another source - they found the coupling in the store with the fitting instructons attached.
RE: Rotate the shaft 2 1/4 turn weekly - API 686 - ?
Ideally, if you have experienced personnel that know the equipment, and can adequately mitigate possible problems, you can perform this task with little risk.