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corrosion allowance

corrosion allowance

corrosion allowance

(OP)

 Hi,

 can anyone tell me what is the corrosion allowance for
 materials(all) vs various flow medium?

 thanks,
 uthaya

RE: corrosion allowance

uthaya:

In my experiences working with ASME Section VIII (Div. 1) and Section I, the normal corrosion allowance for carbon steel is 1/16 in. (I normally work pressure vessels containing water).  Sometimes companies request that we follow the recommendations of HEI (heat exchange institute) which recommends 1/8 in. corrosion allowance (carbon steel).  Stainless steel vessels containing water usually do not have a corrosion allowance.

Hope this helps!

jproj

RE: corrosion allowance

I work for oil and gas industry. Typical Corrosion Allowances for gas industry are mentioned below:

 Wet Gas Piping :
 Velocity > 25.0 ft/sec : 1/4"
 Velocity < 25.0 ft/sec : 1/8"
 Dry Gas Piping         : 1/16"
 Wet Gas Vessels incl.  : 1/8"
 Absorber Columns
 Dry Gas Vessels        : 1/16"
 Glycol Piping & Vessels: 1/8"
 Glycol Still Column    : 1/16"
 incl. Reflex Coil
 Glycol Reboiler Coil   : 1/8"
 Rich/Lean Glycol

More to follow.

D. Gopalkrishna Murti

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