Piping Material for Flashing Service
Piping Material for Flashing Service
(OP)
Hi Everyone,
I'm working on solving of the following issue:
Condensate return line has Condnesate Level Pot with 60 psig pressure. This pot has Level Transmitter which controls Level Control Valve, downstream from Condnesate Level Pot. Piping between Condnesate Level Pot and Level Control Valve is gravity feed. After Level Control Valve it goes to common header where two other condensate lines are tied-in in similar way. This condnesate header goes up 15 ft and connected to Condnesate Collecting Tank which has atmospheric pressure.
I have flashing going on at valve and after. There is severe erosion going on in all components of piping after this Level Control Valves.
I contacted Fisher and they recommended ES valve instead of EZ which was installed.
I calculated line sizes and they are undersized. I'm planning to split lines which will double line capacity and reduce velocities by half.
I also would like to recommend 2 1/4 Cr - 1 Mo CS piping material for all piping after those valves.
Can someone recommend certain ASTM material grade for this type of service? I need both for piping, and fittings (forgings).
Thank you,
Kurt
I'm working on solving of the following issue:
Condensate return line has Condnesate Level Pot with 60 psig pressure. This pot has Level Transmitter which controls Level Control Valve, downstream from Condnesate Level Pot. Piping between Condnesate Level Pot and Level Control Valve is gravity feed. After Level Control Valve it goes to common header where two other condensate lines are tied-in in similar way. This condnesate header goes up 15 ft and connected to Condnesate Collecting Tank which has atmospheric pressure.
I have flashing going on at valve and after. There is severe erosion going on in all components of piping after this Level Control Valves.
I contacted Fisher and they recommended ES valve instead of EZ which was installed.
I calculated line sizes and they are undersized. I'm planning to split lines which will double line capacity and reduce velocities by half.
I also would like to recommend 2 1/4 Cr - 1 Mo CS piping material for all piping after those valves.
Can someone recommend certain ASTM material grade for this type of service? I need both for piping, and fittings (forgings).
Thank you,
Kurt





RE: Piping Material for Flashing Service
ASTM A335 P22 - Pipe
ASTM A182 F22 - Forged
ASTM A234 WP22 - Wrought
Beware the class designations for F22 and WP22.
- Steve Perry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.
RE: Piping Material for Flashing Service
Thank you for your response. I also wanted to hear personal experinces solving these type of issues. Did you use these or other material in this operating conditions yourself? Can you quantify effect of these materials (let's say, it lasted 10 years instead of 5 when, for instance, SA53-B was used)? Are they readily available?
Thank you,
Kurt
RE: Piping Material for Flashing Service
RE: Piping Material for Flashing Service
Do some research on flow accelerated corrosion, erosion-corrosion, and impingement. Replacing CS with chrome >= 1.25% has been the common recommendation I found for addressing existing issues. That means A335 P11. That should be cheaper than P22, depending on availability and quantity.
For one:
http://www.power-eng.com/articles/print/volume-111...
I am pretty sure EPRI has info on this too for its members.
- Steve Perry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.