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B31.3 Mineral oil with additive, cat D or normal fluid service?

B31.3 Mineral oil with additive, cat D or normal fluid service?

B31.3 Mineral oil with additive, cat D or normal fluid service?

(OP)
Hello all
I have a piping question, what category piping should I choose for a mineral oil with 5% pseudocumene (basically flammable, marine toxin).  The chemical passes the Cat D non-flammable, low pressure, and does not cause irreversible damage to human tissue.  My hang up is the toxicity portion.  B31.3 doesn't quantitatively define toxicity.  The toxic portion in its pure form has an LD50 of 5g/kg. http://msds.chem.ox.ac.uk/TR/1,2,4-trimethylbenzene.html  Relatively low toxicity.

So my dilemma is whether to categorize the piping as D or normal.  Any help is appreciated!!!
  

RE: B31.3 Mineral oil with additive, cat D or normal fluid service?

(OP)
Also this will be in secondary containment for all transfer processes.   

RE: B31.3 Mineral oil with additive, cat D or normal fluid service?

Why should'nt you call it NFS?
That's always okee.

RE: B31.3 Mineral oil with additive, cat D or normal fluid service?

(OP)
Well we have to radiograph our welds for NFS (10%), and would rather not bring out an radiograph group for 2 welds.

RE: B31.3 Mineral oil with additive, cat D or normal fluid service?

I'm not sure, but I don't think the medium is cat.D.
Can't you combine photographing with another job?
For 1 weld it's not that expensive

RE: B31.3 Mineral oil with additive, cat D or normal fluid service?

Hallo Noombeng

Somthing to ponder about, a Third party inspector (AIA) once asked me if I would drink the process meduim? If Yes, it can qualify as a Cat 'D' line?

 

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