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steam mains air removing

steam mains air removing

steam mains air removing

(OP)
Hi

At the end of steam mains which works periodic (8 hrs per day) thermostatic air vent is installed.
I wonder if there should be fitted check valve after thermostatic air vent to prevent air to come back when steam line is cold.
What do you think?

RE: steam mains air removing

If you do not have air in the line what will be there instead? Vacuum? Condensate? Choose what you want and design to assure it. Air seems a good choice in many cases.

RE: steam mains air removing

(OP)
Steam line has no vacuum rating. I think i will leave open end of air vent to the atmosphere.

Thank you for your help.

RE: steam mains air removing

Now you see the reason that we don't use steam for pneumatic controls. The condensing thing can be a really big deal.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. ùGalileo Galilei, Italian Physicist

RE: steam mains air removing

zdas04,

YES! But in addition, use of thoroughly dry air is almost always a necessity for good pneumatic systems--particularly where freezing temperatures can be anticipated.

Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.

RE: steam mains air removing

process gas at low pressure can also create water drop out and freeze....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

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