PVC vs. Glycol?? Bill N

Bill Nye_2

Should I be concerned? I was installing a chiller and the directions said not to use PVC or CPVC because of the glycol?

I have never heard of this, should I worry? The job is almost a year old and the pipe is already run and covered up. I just took over today because the other guy got hurt. {He's ok}

kevin coppinger_4

from everything...

I have been told is that glcol eats cpvc and pvc....that is why they tell you to use glycerine protect from freezing and the like. kpc

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Bill Nye_2

thanks

thanks Kevin

KCA_2

Also



Any oil based product.. ie: pipe dope, putty etc. eats PVC..

Hmmmmm

:-) Ken

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Kal Row

in how long?...

never seen the thin undersink drain pipes be eaten by anything and the MaterialSafetyDataSheets say to ware PVC gloves and glasses when working with glycol - so what gives???

hr

Most plastics

are compatiable with PG. For some reason Dow suggest not mixing PVC and glycols.

I know the chlorine in swimming pool systems breaks down PVC after awhile, although chlorinated water is used in most city water systems connected to PVC.

I suspect glycols break down PVC after awhile in the same fashion.

I imagine % solution, and possibly temperature would have an effect on the life expectancy?

The only antifreeze we were able to use in PVC fire sprinklers was glycerin. I believe NFPA also prohibits glycols in PVC systems, as well as Blazemaster and other manufactures of PVC sprink pipe.

hot rod

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tls_9

I don't know...

I dont know exactly what type of plastic it was but I remember seeing, a few years back, where the O rings on the stems of control vales would let a dop of glycol through now and then and it would melt the plastic adapter for the actuater. the actuators would fall off and the unit go to full heat.

glycol can be nasty stuff

t

Kal Row

i think with the sprinklers is is a solution issue...

with water and glycol, you get solution seperation and will still get icy chnks - wont bust your pipes - but the ice chunks can block stuff, not good for a sprinkler

Kal Row

ethelyne or propelyne

cause the premixed "cryo-tech" stuff from herculese with PG has no warnings to that effect on the bottle

Kal Row

you are right HR, i take it back, court case results...

Case
Allstate Insurance v. Sibley et al, Eagle Cty CO Dist Ct 96CV219
Attorney
James Puga, formerly of Godfrey Associates, Denver, CO, 80231, now with Leventhal & Brown, PC, 950 S. Cherry St. Denver CO 80246, tel 303-759-9945, fax 303-759-9692
Representing
Defendant pipe manufacturer

Testimony
Report - Analysis confirmed that CPVC pipe in a fire sprinkler system had been filled with propylene glycol/water antifreeze solution, contrary to pipe manufacturer's instructions. Pipe failure and water damage was caused by environmental stress cracking due to the glycol.
Outcome
Pipe manufacturer was absolved.

Drew_2

PG/PVC

PG is used as a plasticizer in PVC production. When left in PVC it softens it. The higher the % of PG the quicker this will happen.