Alloy625 CA

[LabOwl]

Dear Members
Can anyone help me with corrosion allowances for alloy625 pipes in 250mm and 300mm diameters, both Sch10
Any assistance would be appreciated.
tia

p.s. Apology to DTC for posting this thread in yours by mistake.

 

[hacksaw]

to assign a corrosion allowance, you need to have developed corrosion rates (experience) or from pilot studies and/or reference materials.

if this is piping covered under B31, then part of the problem is addresses in the method used to set the allowable stress for the materials.

 

[Metalguy]

Or did you want actual estimated rates of corrosion? If so, we need the flow rates, temp. and chemicals involved.

 

[LabOwl]

yes, estimates at this stage would be sufficient.
The flow rate of the gas stream comprising 69% Cl2, 19% N2, 5% O2 & other is 27537 kg/hr.
The temperature is 190°C and pressure is 280 kPa
thanks for your help with this.