12 replies to this topic

[A.D.]

Anyone knows this statement what is meant in a note in P&ID: "Air cooler fan to be shutdown in an even manner".

Edited by dehghan.akbar, 13 October 2021 - 04:21 AM.

[latexman]

Nope.  Contact the Lead Process Engineer who put the note there.

[A.D.]

This note is coming from Licensor PID and Lead Process want to know the meaning!!!

[latexman]

Then contact the Licensor.

[A.D.]

Please let other members respond if you do not have information on this issue. Certainly, if there was access to licensor, there would be no question here!!!

[latexman]

I am not preventing anyone from responding. I gave the advice I would follow, if it was possible. I do not know your circumstances, because the OP has no details. If it is not of value to you, just wait for others to reply. Your rebuttals and your !!! definitely show a lack of maturity. Be patient, Grasshopper.

[Pilesar]

If the fan motors are variable speed drive, perhaps the meaning is to operate the fans while steadily reducing speed for a period of time before cutting the power to them. My guess is the writer of the sentence knew what he meant but was unable to communicate those thoughts clearly when he wrote the note. He may have known nothing about shutting down air cooler fans and decided to write something that sounded like he had knowledge in order to please his boss. Does anyone you know have a history with air cooler fans who might can suggest a reasonable way to shut them down? 

[breizh]

Hi ,

Can you give us more information about the fan/motor ? capacity/Power ? How do you ramp up the motor to reach the full capacity ? Is there any specific equipment to increase the speed like VSD ?

 

note : is it an existing equipment ? If yes you may talk to the operation team and check their shut down procedure . 

 

More details are needed to get an effective support !

 

My 2 cents

Breizh 

[A.D.]

Thanks to ALL,

 

Air cooler (incl. 4 bundles , each bundle has two motors) has VSD on motor for 50% of fan motors (only for two bundles)

 

There is temp. control (TIC) to control fan capacity.

 

Motor rated power 18.5 kW. This is a new design and new unit.

 

Regards,

A.D.

Edited by A.D., 16 October 2021 - 02:22 AM.

[Chemitofreak]

Anyone knows this statement what is meant in a note in P&ID: "Air cooler fan to be shutdown in an even manner".

 

Note that the VFD are present on only two bundles out of four i.e. when you are trying to control the outlet temperature there is a possibility of uneven cooling, hence he may have written this note.

 

It is good idea to have 50% of motors on all the bundles to have VFD, but I guess someone is trying to save money in the project. 

[Chemitofreak]

Please let other members respond if you do not have information on this issue. Certainly, if there was access to licensor, there would be no question here!!!

 

Take a chill pill. Both the answers posted by Latexman are quite straight forward and anyone should do that in the first place i.e. ask the person who has put that note on the P&ID or for that matter ask the Lincensor if it is coming from him. If you do not have access to the Licensor, then ask the Client, he will definitely have contact with the Licensor.

 

It is always good to hear from the horse's mouth, or else everyone is playing the guessing game, which in turn can be dangerous. 

Edited by Chemitofreak, 20 October 2021 - 01:23 AM.

[Napo]

If the fan motors are variable speed drive, perhaps the meaning is to operate the fans while steadily reducing speed for a period of time before cutting the power to them. My guess is the writer of the sentence knew what he meant but was unable to communicate those thoughts clearly when he wrote the note. He may have known nothing about shutting down air cooler fans and decided to write something that sounded like he had knowledge in order to please his boss. Does anyone you know have a history with air cooler fans who might can suggest a reasonable way to shut them down? 

A.D.,

 

I'm accord with Pilesar. In our cooling tower we proceed how he has indicated.

 

Napo.

[fallah]

Anyone knows this statement what is meant in a note in P&ID: "Air cooler fan to be shutdown in an even manner".

 

Hi,

 

It simply means: In the case of shutdown (local or total) or in most case of need to lesser cooling rate, to keep the temperature uniformity of the fluid insider the air cooler, the eight motors fans (4 bundles , each bundle has two motors) should be evenly shutdown...