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M Fluid Based on ASME B31.3 Definition

11/10/2011 4:02 AM

Dear Milister

Good Afternoon

Lets discuss about M Fluid Definition

Based on ASME B31.3, M Fluid is a fluid service in which the potential for personnel exposure is judged to be significant and in which a single exposure to a very small quantity of a toxic fluid, caused by leakage, can produce serious irreversible harm to persons on breathing or bodily contact, even when prompt restorative measures are taken.

We are curious for defining exact definition of M Fluid.

May we define with NFPA 704 rating?

There are any 4 blue/health category:

4Materials which upon very limited exposure could cause death or major residual injury even though prompt medical treatment is given, including those which are too dangerous to be approached without specialized protective equipment. This degree should include:
  • Materials which can penetrate ordinary rubber protective clothing;
  • Materials which under normal conditions or under fire conditions give off gases which are extremely hazardous (i.e., toxic or corrosive) through inhalation or through contact with or absorption through the skin.
3Materials which upon short-term exposure could cause serious temporary or residual injury even though prompt medical treatment is given, including those requiring protection from all bodily contact. This degree should include:
  • Materials giving off highly toxic combusion products;
  • Materials corrosive to living tissue or toxic by skin absorption.
2Materials which on intense or continued exposure could cause temporary incapacitation or possible residual injury unless prompt medical treatment is given, including those requiring use of respiratory protective equipment with independent air supply. This degree should include:
  • Materials giving off toxic combusion products;
  • Materials giving off highly irritating combustion products;
  • Materials which either under normal conditions or under fire conditions give off toxic vapors lacking warning properties.
1Materials which on exposure would cause irritation but only minor residucal injury even if no treatment is given, including those which require use of an approved canister type gas mask. This degree should include:
  • Materials which under fire conditions would give off irritating combustion products
  • Materials which on the skin could cause irritation without destruction of tissue.
0Materials which on exposure under fire conditons would offer no hazard beyond that of ordinary combustible material.

    Based on above explanation, we conclude that M Fluid is under category 3 and 4.

It is correct?

Is there any other exact definition?

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Guru
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#1

Re: M Fluid Based on ASME B31.3 Definition

11/10/2011 4:13 AM

Water can be made to fit 4:

  • High pressure water jetting
  • Steam
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#2

Re: M Fluid Based on ASME B31.3 Definition

11/10/2011 3:50 PM

Let's discuss what country you are in, first.

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#3

Re: M Fluid Based on ASME B31.3 Definition

11/10/2011 9:12 PM

Sorry i doesn't agree if water classify under category 4.

For water jetting, if the pressure rating is above 2500 class rating, it classifies to High Pressure fluid service (chapter IX on ASME B31.3). Furthermore, untreated water is untoxic, commonly.

I live in Indonesia.

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Guru
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#4
In reply to #3

Re: M Fluid Based on ASME B31.3 Definition

11/11/2011 3:09 AM

<...untreated water is untoxic...>

The LD50 for water in humans is around 18 gallons, though one can drown in a bucketful. Non-toxic indeed!

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#5

Re: M Fluid Based on ASME B31.3 Definition

11/11/2011 11:06 AM

AvatarIndo, first, NFPA 704 (aka, "fire diamond) is specifically for emergency responders and tells them what equipment they need to use (or not use). Typically the material in question is going to be in some form of a container or leaking from one.

Category M Fluid Service is designated by the owner of the system and refers to the type of process piping system and the additional precautions and requirements necessary to meet ASME Code.

This does not preclude an owner/user from using the NFPA 704 fire diamond to rate a Category M fluid, but you would need to do it on a case by case basis, i.e., not all Category M fluids are a type 3, and not all type 3 are a Category M fluid. IMHO, the definition of a Category M Fluid seems pretty concise, why do you need to expand the definition? Keep in mind, Category M fluid service is only in the context of process piping, not anything else.

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