Vessel and Header Difference

Kasa,

You have not defined the context for your question.

By this I mean:

A). Are you talking about "Vessels & Headers" as in a Refinery or Chemical plant?

or

B). Are you talking about "Vessels & Headers" as in Anatomy or Botany?

or

C). Are you talking about "Vessels & Headers" as in Ships?

Thank you for your attantion!!

We have some arguments that whether or not the big air headers to supply air to the 16 reciprocating gas engines at air system in power plant are a pressure vessel.

Air header or vessel specification installed at power plant

§ have 2 headers, the length is 100foot, the diameter is 16 inches, the material is A106 B and the capacity is 140 cubic foot, also have the header relief valve set 475 psig. Each header has connected 8 pipes sized 1and ½ inches.

§ have 4 headers, the diameter is 24 inches, the material is A106 B and each header has the header relief valves set 475 psig. Each header has connected 4 pipes sized 1and ½ inches.

Those air headers look very similar pressure vessel because of the big sized pipe and pressure and capacity. But those headers have not the fuction of storage and made of seamless pipe under ASME Power Piping Code. But someone insists that those header is pressure vessel.. What do you think about that? and is there any special definition for determination?

"A typical vessel would utilize a header lateral assembly at the top to distribute inflow evenly across the bed surface.

A second assembly, located near the vessel bottom, could collect the treated flow and pass it either through the vessel sidewall or by attaching the laterals to a central manifold out the vessel bottom. "

http://www.johnsonscreens.com/sites/default/files/6/703/Internals%20for%20Down%20Flow%20Reactors.pdf

http://www.johnsonscreens.com/content/header-laterals

http://en.wikipedia.org/wiki/Pressure_vessel

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You want a dictionary.

Vessel can store materials. Examples are boiler,ships,pressure tank etc. Header is like an electrical busbar in a switchboard from which you can tap many outlets.Example steam header in a boiler house.