Hi LittleInch,
Firstly I would like to thank you for the answers. Thank you very much
Please see below in bold my answers, comments and questions.
So is your question how big can I make item 10? In my opinion as big as you want up to about 1220mm 48/52". So long as you're not heating it or doing any processing then it's not a pressure vessel but just a piece of pipe.
Yes my question is how big I can make the item 10 avoiding the pressure vessel classification.
You are correct, I am not doing any heating and processing to the system. I just want to get rid of condensate sample and drain it into a slop tank.
My comments / questions on that design are:
1) Without seeing the P & ID it's difficult to see how it's supposed to work, but without a vent, your pipe isn't going to fill as a tank butjust be a bigger piece of pipe. If item 1 is open to the atmosphere, you need to think about where the air is going to go when you try to fill item 10. If your inlet is quite small you won't get air and fluid going in two different directions at the same time...
I will attach the P&ID once I get the confirmation the location of the connection. I am thinking to put an air vent on the top and a drain valve at the lower of the item 9. Can you please advice if I can do that?
I am thinking to put size of my pipe of 40mm.
2) I would always avoid welding into a cap end - they're not really designed for it. For your size I would use a concentric reducer or reducers in place of the lower item 9.
Yes, this is good recommendation. I will put reducer in place of item 9.
3) Valves at the base of a tank often fail due to debris gathering on top of it when it's shut and then damaging the ball / seals.
Yes, it might damage the vall with debris on the top of the valve. Can you please advice any better solution of using other type of valve?
4) Your spring loaded non return valve will need a certain head to open it and will then leave fluid on the inlet side. 587 may not be enough to opent he valve, but may leave some fluid in the valve and will also not allow venting through it.
What is 587?
Think you need to go back to first principles here or ask questions of the process engineer who drew up the P & ID...