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Nozzle Sizes for PD 5500 Cat I or BS EN13445

Nozzle Sizes for PD 5500 Cat I or BS EN13445

Nozzle Sizes for PD 5500 Cat I or BS EN13445

(OP)
I am developing a small pressure vessel that must comply with PD 5500 Cat I or BS EN13445.  The media is anhydrous ammonia vapor.  There is BS EN 12952 for ammonia storage tanks that require nozzles to be a minimum of DN50.

My question is:  does PD 5500 Cat I or BS EN13445 also require a minimum DN 50 nozzle?

Some basic data is:

dia = 3 ft
L (S-S) = 4 ft
design pressure = 350 psig
design temperature = 250 degF
material = SS316L
media: anhydrous ammonia vapor


 

RE: Nozzle Sizes for PD 5500 Cat I or BS EN13445

You really need a copy of both codes, they are different in some areas but similar in others.

EN13445 was, unfortunately, is appears constructed in committee through compromise, it has large sections from PD5500, AD 2000 and even some elements from other European codes.

There are conditions for materials, minimum thicknesses, minimum radii at junctions, hole sizes, compensation, positioning and so much more.

For example PD5500 doesn't have a minimum nozzle size but does have minimum wall thicknesses for each nozzle size and these do not relate to pipe Sch40 or Std thicknesses, for example, a 2" Sch40 is too thin for PD5500.

The only way to design to either of these standards is to obtain copies of them I'm afraid.

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