Deaerator / Integral deaerator and ASME code jurisdiction

[coolniks37]

Hi

Whether deaerator of a power plant is a pressure part or not?
If so, whether ASME recognizes it ? In the code jurisdiction diagram given, it is not clear whether it needs to be considered in boiler proper or not?
What are the general standards to which deaerators are made, if not ASME?

In case of integral-deaerator design (usually in HRSG) , where LP drum acts as deaerator tank, how code jurisdiction is envisaged?
Or if deaerator tank is kept on top of LP drum and connected using pipes, how the code jurisdiction will be envisaged?

Kindly reply

 

[VIJAYANSA]

Hi coolniks37,

Deaerator of a power plant is a pressure vessel component which is come under the jurisdiction of ASME SEC VIII DIV 1. The Deaerator component is located before the firing station of power plant. And also, it is seperated from firing station by number of pipings. So, it won't be come under the ASME SEC I. So, it will be considered as a pressure vessel.

For the detail of corrosion allowance (= 3mm) and material of construction, refer Heat Exchangers Institute (HEI) standard.

Regards,

VIJAYAN S A

 

[weldstan]

Deaerators can be under either ASME I or ASME VIII, Div.1. Low pressure drums on HRSGs are per ASME I.