Sub-sea air valve

[dragos12]

Dear Experienced ones,
I was asked to supply an air valve to be used an deep sea water discharge pipeline.
Valves to be used along the pipeline thus air valve to operate undersea.
Acc. to me, I never saw such application and can not imagine that there is a design
like this.
Did you ever see any similar requirement or such pipelines do not need to breathe?
(air release, vacuum etc)

 

[LittleInch]

do you mean an automatic air release valve?

How deep is "deep sea"?

Temporary flooding exercise or permanent operation.

I'm struggling to understand this valve and its purpose?

Are you just trying to supply it or design it or??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[RVAmeche]

Would air release at the high points (ie, sea level) not be preferred?

 

[dragos12]

LittleInch & RVAmeche thanks for time and caring.
We can consider like starting from zero and reaching to 30-35 meters depth at the end of the pipeline.
It will be sea outfall for cooling water discharge. Purpose is similar to a land pipeline, to protect the pipeline.
Beyond supplying it, I try to understand if such pipeline really needs to be protected against
air pockets during filling, operation etc. I never heard something like this.
Such Pipelines are normally continiously inclining following the sea bed.

I looked thru different articles and books like Subsea Pipeline Engineering book, never
saw requirement like this. Thanks !

 

[Compositepro]

Such a pipe could float if filled with air, so that must be prevented. If air gets into the pipe, how will it get out? Air can accumulate in the pipe if no precautions are taken.

 

[Control_valve]

应该就是排气阀(泄压阀)但是在深海下面，海水的压力也是很大的。在深海底下排气的话，阀内的气压力要大于海水压力才能阀门开启。所以你所说的冷凝气的压力得很大，但是管内的冷凝气压力有很么大吗？有的话，可以设计一个排气+一个止回阀组合起来工作。止回阀在出处防止海水倒流时管道中

 

[Control_valve]

你让客户提供此阀在深海工作的最深安装位置的海水压力。就可以进行了。相像过鱼儿在深海呼吸吐泡吗？

 

[IRstuff]

@Control_valve Please bear in mind that most posters here are English-speakers, so answers are ideally in the language of the OP.

Thanks



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[Control_valve]

@ IRstuff, I am sorry . I mean:

But under the deep sea, the pressure of the seawater is also very high. Under the deep sea, the air pressure inside the valve must be higher than the sea pressure to open the valve. So the condensate gas pressure you are talking about is very high, but is the condensate gas pressure inside the pipe very high?If available, an exhaust can be designed to work with a check valve in place to prevent backflow of seawater in the pipeline
-----------------------
You ask the customer to provide the seawater pressure for the deepest installation of this valve in the deep sea and design