Valve Questions - 22" Piggable Line
Valve Questions - 22" Piggable Line
(OP)
I'm running in to the following problem:
I've been asked to replace the old valves on a 22" Pigable liquid line. Currently they are using 22" Slab Gate Valves and they were wanted to replace the valves with essentially the same setup.
The problem is that it seems 22" Gate valves are quite hard to find / long lead times / discontinued. This seems like a silly question: But am I able to use 24" valves in place of the 22" in some way?
The goal is total isolation and pigable.
Any other methods around this? They would certainly prefer not to have to replace the whole line, but replacing the valves is inevitable.
Thanks,
-G
I've been asked to replace the old valves on a 22" Pigable liquid line. Currently they are using 22" Slab Gate Valves and they were wanted to replace the valves with essentially the same setup.
The problem is that it seems 22" Gate valves are quite hard to find / long lead times / discontinued. This seems like a silly question: But am I able to use 24" valves in place of the 22" in some way?
The goal is total isolation and pigable.
Any other methods around this? They would certainly prefer not to have to replace the whole line, but replacing the valves is inevitable.
Thanks,
-G





RE: Valve Questions - 22" Piggable Line
22", not truly being a standard size, may be more difficult to find.
Ball valves?
you must get smarter than the software you're using.
RE: Valve Questions - 22" Piggable Line
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Valve Questions - 22" Piggable Line
I think their preference is to use Gate valves, although one of the options we're going to present is swapping to ball valves.
RE: Valve Questions - 22" Piggable Line
For info, why do these valves need replacing? Can't you repair or refurbish them?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Valve Questions - 22" Piggable Line
They requested that we replace the valve because according to the company's specs they have to have positive isolation before leaving their lease.
I'm all for just scrapping the valve and putting a spool piece, but per client's request (whether it's useful or not) they want a new valve in place of the old one.
So to answer the question: No repair, refurbish, or removal unfortunately.
I think we are going to look in to 24" gate valves since we are already order one of a different line under the same project under the same timeline.
Also, the other idea to use ball valves was nixed because they said they won't bury ball valves according to company policy. Lots of red tape with these guys.
RE: Valve Questions - 22" Piggable Line
RE: Valve Questions - 22" Piggable Line
you must get smarter than the software you're using.
RE: Valve Questions - 22" Piggable Line
Pigs normally require the bore size to be within +/- 5% of the pipe ID. A pipe at is termed 22 inch bore normally means 22 inch OD on large line sizes. Which means the ID will be smaller. I think it would be wise to check the true ID of the line. A 24 inch valve will have a longer end to end dimension and whilst a pig would probably go through it, there is a high probability the pig would be damaged. Certainly this would not be acceptable if using an intelligent pig. 22 inch through conduit gate valves are available albeit made to order. A ball valve is an acceptable alternative but would need to have hard seat inserts because of potential pigging damage to the seats.
Hope this helps!
RE: Valve Questions - 22" Piggable Line
There's many kinds of pigs. Some 10" pigs will go through a 6" pipe.
you must get smarter than the software you're using.
RE: Valve Questions - 22" Piggable Line
The kicker is that they don't know the pipe grade or thickness either and thus far trying to find the information has been a hassle. My next step is carbon testing and ultrasonic testing, then contact whoever manufactures their pigs and see what they think about the change in ID/OD, etc...
Pro tip: Don't do anything in 22" - Our valve manufacturer "No Quoted" a 22" gate valve.
-G
RE: Valve Questions - 22" Piggable Line
you must get smarter than the software you're using.