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Glyphosate, lethal fluid??
4

Glyphosate, lethal fluid??

Glyphosate, lethal fluid??

(OP)
Should it be taken as "lethal fluid" for PV calculation purpose.
Any input will be appreciated.

RE: Glyphosate, lethal fluid??

2
Why would you think it's lethal?

For a pressure vessel, a lethal fluid is one that "[A] vessel is to contain fluids of such a nature that a very small amount mixed or unmixed with air is dangerous to life when inhaled[.] By "lethal substances" are meant poisonous gases or liquids of such a nature that a very small amount of the gas or of the vapour of the liquid mixed or unmixed with air is dangerous to-life when inhaled. For purposes of this Division, this class includes substances of this nature which are stored under pressure or may generate a pressure if stored in a closed vessel."

http://www.pveng.com/ASME/ASMEComment/LethalServic...

http://www.eng-tips.com/viewthread.cfm?qid=308653

One example of a 'typical' lethal service material is phosgene

MSDS phosgene, https://www.mathesongas.com/pdfs/msds/MAT18660.pdf

MSDS glyphosate, https://www.lakerestoration.com/pdf/GlyphosateMSDS...

Not even close IMO when you have something for glyphosate "No more than slightly toxic and no significant adverse health effects are expected to develop if a small amount (less than a mouthful) is swallowed"

RE: Glyphosate, lethal fluid??

(OP)
TD2K, I´m not thinking but asking since there are a lot of papers recently talking about the carcinogenic efects of this product.
As stated by ASME: "It is up to the user to determine if a service is lethal. We at Pressure Vessel Engineering do not determine if the vessel service is lethal (but we might have opinions based on previous jobs)".

RE: Glyphosate, lethal fluid??

Pretty much everything could be classified a lethal fluid I guess. People drown in water. Steam can easily cause life threatening burns. Nitrogen is an asphyxiant. Too much oxygen can be toxic. Etc, etc, etc.

RE: Glyphosate, lethal fluid??

Hats Off TD2K

RE: Glyphosate, lethal fluid??

2
According to Australian standards AS 4343 "Pressure equipment - Hazard levels":

"Lethal contents are classified as containing a very toxic substance or highly radio active substance which, under the expected concentration and operating conditions, is capable, on leakage, of producing death or serious irreversible harm to persons from a single short term exposure to a very small amount of the substance by inhalation or contact, even when prompt restorative measures are taken.

Very harmful contents are “containing a substance, which, under expected concentration and operating conditions, are classified as extremely or highly flammable, very toxic, toxic, harmful, oxidizing, explosive, self-reactive, corrosive, or harmful to human tissue, but excluding lethal contents.” This class includes carcinogenic, mutagenic and tetatogenic substances.

Harmful contents are “containing a substance which, under the expected concentration and operating conditions, is classified as a combustible liquid or fluid irritant to humans, or is harmful to the environment, above 90
°C, or below –30°C, but excluding lethal or very harmful fluid.

Non-harmful contents are contents not covered by the above categories except for concentration effects such as oxygen depletion and pressure."

See also http://www.designapproval.org/as-4343-i-pressure-e... (the page is in Italian but very easy to navigate through)


Dejan IVANOVIC
Process Engineer, MSChE

RE: Glyphosate, lethal fluid??

TD2K - that was a great post, worth more than a single star.

Dejan IVANOVIC
Process Engineer, MSChE

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