How To Isolate a pump ?

Assuming that it is one of a parallel set that need to be repaired.

You should close the isolation valves on the suction and discharge sides.

If no valve is present you should stop the system and temporally fit blank flanges or end caps for screw in.

Note for screw in piping a union is always a good idea.

Also note when using the spell checker to select the appropriate word when offered. Example palnt will offer paint and plant.

You SHOULD NOT post questions such as this to a group of total strangers who have no knowledge of your equipment, country, state of mind of the operators of said Phenol Palnt nor your level of competence in the field of??

What is your field?

Informed, reasoned decisions are made only if adequate INFORMATION is provided with the question.

You should try Google first. It doesn't care if you ask stupid questions.

Here here. Talk to the system designer. Look at the system yourself. Where are the drawings? Seriously?

Uhhhh turn the valve on the right. No errr the left one. No no no the one on top. Uhhhhh I dunno.

Seriously.

The answer is - with wxtrem care!!!!! Get someone more expert - if you ask a question like this when dealing with phenol then you need to do a lot of homework.

Dear Mr Kuaile.

This is no forum for selling handbags and tee shirts.

Pl desist from this practice.

Just checked your profile- all your posts are for the same , and in various forums except the commercial space.

There are other ways of advertising (of course that will not be free)

regards

Absolutely. Welcome neighbor.

"Fairly Hazardous" is an understatement - Phenol is extremely hazardous especially in the liquid form (solution or molten - not stated here). It burns the skin and has systemic toxicity and will affect the internal organs.

You're right, it was an understatement, I did a little more research after the first post on the chemical in question and it is nasty. However, I would say the same thing about almost any other system for isolation. To me, proper isolation is one of the largest responsibilities for plant personnel.

Improper isolation is not a lesson you want to learn the hard way, I have had a couple near misses, one of them was on a water pump where I was replacing the shaft seal and the foreman needed to start a different pump in the same breaker box that I had locked out. I gave him my key and just to be "safe", stood up and away from the pump out of service. Sure enough, the pump in maintenance started right up, luckily my hand wasn't on the impeller like it had been 15 seconds earlier. That was the last time I ever did anything like that.

After many years managing chemical plants I have found one of the worst situations is in understanding types of valves and types of pumps and have gone out of my way to ensure proper training in valve types and the replacement of any which do not display their state. If it is a gate or similar thern a rising stem is best, ball valves give the best indication but circumstances can demand others. In my plant a phenol pump would need to be fitted with in and out valves and also care to have pressure relief if a positive displacement pump is used.

If your going to do any of this type work, you need a comprehensive Lock_out_tag_out system in place. If you don't, people can and will die.

http://www.osha.gov/OshDoc/data_General_Facts/factsheet-lockout-tagout.pdf

About 15 years ago, at my company, 8 men where killed because the equipment was not properly locked out. And yes, it involved a valve between an accumulator and a "pump".

By following appropriate training?

By following the facility-approved written procedure for so doing?

First you need to be educated on the proper handling of Phenol...

https://www.petrochemistry.eu/wp-content/uploads/2018/01/Phenol-manual-14-08-2015.pdf

Then you need to work out a strategy with the plant engineer and head mechanic, get all your prep work and materials in place, and you can begin...