Valve's trim in H2SO4 service
Valve's trim in H2SO4 service
(OP)
Hi
In H2SO4 services (98% - 85c) the contractor want to use PTFE as body seat ring and trim but we think it is not proper. also we have another choice, carbon steel. but seems high corrosion will be happened in aforementioned temperature.
could you please help me to select the best choice.
In H2SO4 services (98% - 85c) the contractor want to use PTFE as body seat ring and trim but we think it is not proper. also we have another choice, carbon steel. but seems high corrosion will be happened in aforementioned temperature.
could you please help me to select the best choice.





RE: Valve's trim in H2SO4 service
RE: Valve's trim in H2SO4 service
RE: Valve's trim in H2SO4 service
Alloy 20 has a hope, but I'm not near my references. You'd need to review the NACE sheets and see what it says for pipe- then increase the alloy selection in the direction of additional resistance because you're dealing with material exposed to high velocity and potential erosion-corrosion.
RE: Valve's trim in H2SO4 service
http://globalsupplyline.com.au/wp-content/uploads/...
RE: Valve's trim in H2SO4 service
Even though 98% acid isn't all that corrosion resistant the combination of high temp and flow make this a delicate application.
You need to own a copy of MS-1 on Sulfuric acid and Oleum printed by MTI.
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P.E. Metallurgy, Plymouth Tube
RE: Valve's trim in H2SO4 service
RE: Valve's trim in H2SO4 service
http://www.rolledalloys.com/alloys/nickel-alloys/a...
Since this seems to be your first acid system, and since Alloy 20 is expensive in a huge globe valve, perhaps this large, expensive type of valve is not your best choice...???
Consider the use of butterfly valves for flow control and plug valves for on-off control.
XOMOX Series 9000, or the cheap Chinese knock-off, may be a good choice .....
http://www.sulphuric-acid.com/techmanual/strong%20...
Like most of these posts, we never get enough information without asking several times ...
What is the strength of the H2SO4 ????
MJCronin
Sr. Process Engineer
RE: Valve's trim in H2SO4 service
RE: Valve's trim in H2SO4 service