Newbie question - About design of subsea valves
Newbie question - About design of subsea valves
(OP)
Hi all.
My question will certainly look like evident for some people.
I'm currently beginning design of subsea valves.
I read several standards, but there is something I can't fix about the class pressure.
What I retained is that the design has to follow a pressure class as any other valve design, and that "valves shall be designed for loads other than internal pressure and temperature if specified by the purchaser" (from API 6DSS).
So let's say I have process conditions giving a 600# class (150 bars), but that my valve is to be placed by -3000 meters (300 bars of external pressure).
How should I design it?
Like any other 600# valve, but adding thickness to resist to 300 bars of external pressure, modifying the seals, etc.?
Or like an API 5000 valve for example (345 bars internal)?
I really can't make the difference between those 2 options regarding the standards.
There is obviously something I didn't understand.
Please don't laugh of me
My question will certainly look like evident for some people.
I'm currently beginning design of subsea valves.
I read several standards, but there is something I can't fix about the class pressure.
What I retained is that the design has to follow a pressure class as any other valve design, and that "valves shall be designed for loads other than internal pressure and temperature if specified by the purchaser" (from API 6DSS).
So let's say I have process conditions giving a 600# class (150 bars), but that my valve is to be placed by -3000 meters (300 bars of external pressure).
How should I design it?
Like any other 600# valve, but adding thickness to resist to 300 bars of external pressure, modifying the seals, etc.?
Or like an API 5000 valve for example (345 bars internal)?
I really can't make the difference between those 2 options regarding the standards.
There is obviously something I didn't understand.
Please don't laugh of me





RE: Newbie question - About design of subsea valves
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Newbie question - About design of subsea valves
But then what concerning the seals, trunnions bearing (these are ball valves),...
Which class should they follow?
RE: Newbie question - About design of subsea valves
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Newbie question - About design of subsea valves
RE: Newbie question - About design of subsea valves
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Newbie question - About design of subsea valves
.. Interesting approach from BigInch! Another point is of course demand, and for this particular product: future demand and development.
It would always of course be of interest to a designer to talk to end-users and gather some thoughts about sensible price and possible competition, and perhaps lacks in competitive products..
Good luck, Albator!
RE: Newbie question - About design of subsea valves
That is exactly what I began with
But even with this, I was hurting myself to the same thing again and again.
And thanks for the luck