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bwchoo
Active Contributor

Join Date: Jan 2009
Posts: 18

Perchloric Fume Hood with Exhaust System

03/23/2009 12:03 PM

Dear Sir,

I have few questions about the perchloric exhaust system need expert to help.

The questions are

1) Is there any problem if centrifugal fan is used for this application?

2) Is there any problem if the inlet cone of the centrifugal fan is made of fiberglass but other parts are stainless steel 316?

3) Is there any reason why the fan for this application shall be lubricated with fluorocarbon grease?

4) What is the recommended duration required to wash the fan & duct work?

Thanks & regards

Choo
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DVader1000
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Engineering Fields - Environmental Engineering - New Member APIX Pilot Plant Design Project - Member - New Member

Join Date: May 2007
Location: Anywhere Emperor Palpatine assigns me
Posts: 2774
Good Answers: 101
#1

Re: Perchloric Fume Hood with its Exhaust System

03/23/2009 12:45 PM

Perchlorates are extremely powerful oxidants, hence the use of non-flammable fluorocarbon grease. Using flammable hydrocarbon grease can result in an explosion.

Is there any reason why you want to change the fan? If not, best leave it as it is: as least the manufacturer will be liable for it. Tamper with the design, and you'll be liable for whatever consequences may arise as a result.

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jerryalan
Active Contributor

Join Date: Nov 2008
Posts: 17
#2

Re: Perchloric Fume Hood with Exhaust System

03/24/2009 6:30 AM

if you are talking about perchloroethylene you should not use a fan to exhaust fumes.

the water in the pipe that follows the perimeter of the tank about 6" from the top is all that is needed to contain the fumes. if you start using an exhaust fan you will draw fumes/product past this barrier and create problems all over the neighbourhood . . .
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