corroded heat exchangers

[Samingme755]

hi
i want to ask about the procedures for Corroded heat exchangers hydrostatic test for engineering new heat exchanger for new plant
thanks

 

[EdStainless]

What is the question?
Are you just looking for leaks of actually testing for fitness of service?
You would re-test existing (possibly corroded) HX at the same pressure as when they went into service.
If they won't pass that then they are no longer meeting the design.

 

[Samingme755]

the contractor provides this sentence in the engineering drawing of hot oil exchanger and I'm wondering if it is standards to do that for new project thanks

What is the question?
Are you just looking for leaks of actually testing for fitness of service?
You would re-test existing (possibly corroded) HX at the same pressure as when they went into service.
If they won't pass that then they are no longer meeting the design.

 

[LittleInch]

What they might mean is that the hydrostatic test pressure is calculated using the "corroded" thickness allowed for in the design.

So e.g. A pipe thickness is 7mm, but with a 2mm corrosion allowance so they use 5mm in their calculations. Maybe.

Not much to go on here.....

 

[Samingme755]

What they might mean is that the hydrostatic test pressure is calculated using the "corroded" thickness allowed for in the design.

So e.g. A pipe thickness is 7mm, but with a 2mm corrosion allowance so they use 5mm in their calculations. Maybe.

Not much to go on here.....

thank you littleInch