PetroStreet

As per B31.3 , Which fluids ( Chemicals ) are generally included in

1) Category M Fluid Service
2) Category D Fluid Service
3) High Pressure Fluid Service
4) Normal fluid Service.

?

You can't really generalize all the chemicals to any fluid service type (as per ASME B31.3) until or unless you are aware with the service conditions like pressure, temperature, rating etc. Let's take a very simple example, water being non-falmmable and non-toxic can either by a normal fluid service or category D fluid depending upon the pressure and temperature.

But yes for ammonia and all other toxic fluids (which a process engr. can tell), they fall under Category M.

The best way of classifying any fluid is just to look at Fig. M300 in ASME B31.3. It will take only few minutes to classify any fluid.

Other than ammonia I would like to add chlorine, carbon monoxide, nickel carbonyle, cynites all of which fall in Category M fluid.

Attached is a list mentioning all category M fluids by LANL considering the definition of both construction codes i.e. ASME B 31.3 & Section VIII.

Regards - Qaisar Abbas