Spool piece required between check and gate valve?
Spool piece required between check and gate valve?
(OP)
Refer to link. This is just a general question. Notice in the image, the check valve and block valve are bolted together with a note stating to tap the check valve when approved by client specifications, otherwise use a spool piece with a bleed valve. I understand that client specs dictate the proper arrangement, but whenever the specs do not indicate which method they prefer, what is the most economic and practical method to use? My three scenarios are:
1) Bolt check valve to block valve and tap check valve to allow draining and relieving pressure between valves as shown in the image.
2) Add a spool piece between the valves with a bleed as noted in the image.
3) And my third scenario I am curious about, is would it be practical to use a bleed ring with a bleed valve between the check and gate valve? My thinking is that this would save on the time and effort required to tap the check valve, and save on the cost of adding a spool piece. However I am not sure if this is a practical or economic idea. Would there be any issues to worry about with using a bleed ring between valves?
What makes the most sense from a time, effort, cost, and practicality standpoint?
Thanks for all responses.
http://1.bp.blogspot.com/-v5-w08PFNpc/U4uDND6e5NI/...
1) Bolt check valve to block valve and tap check valve to allow draining and relieving pressure between valves as shown in the image.
2) Add a spool piece between the valves with a bleed as noted in the image.
3) And my third scenario I am curious about, is would it be practical to use a bleed ring with a bleed valve between the check and gate valve? My thinking is that this would save on the time and effort required to tap the check valve, and save on the cost of adding a spool piece. However I am not sure if this is a practical or economic idea. Would there be any issues to worry about with using a bleed ring between valves?
What makes the most sense from a time, effort, cost, and practicality standpoint?
Thanks for all responses.
http://1.bp.blogspot.com/-v5-w08PFNpc/U4uDND6e5NI/...





RE: Spool piece required between check and gate valve?
You can searh Eng-Tips. Try "check and block valve"
Reaction to change doesn't stop it
RE: Spool piece required between check and gate valve?
Thanks
RE: Spool piece required between check and gate valve?
Your Option 3 is the most cost effective.
Sometimes its possible to do all the right things and still get bad results
RE: Spool piece required between check and gate valve?
RE: Spool piece required between check and gate valve?
if you think you will have more trouble with broken check valves. A lot of people (I'm not one) seem to think check valve repair is highly desirable.
Reaction to change doesn't stop it
RE: Spool piece required between check and gate valve?
RE: Spool piece required between check and gate valve?
Reaction to change doesn't stop it
RE: Spool piece required between check and gate valve?
Why don't you just tap the flange like an orifice flange?? You're not really draing it just relieving any built up pressure if you take the pump out.
BTW your drawing has the temporary stainer the wrong way round. IMHO.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Spool piece required between check and gate valve?
RE: Spool piece required between check and gate valve?
RE: Spool piece required between check and gate valve?
What?
RE: Spool piece required between check and gate valve?
Reaction to change doesn't stop it
RE: Spool piece required between check and gate valve?
I loathe strainers like this as getting them off makes the pump alignment go to pot and takes forever to get right again. Just inset a Y stainer then take our the basket.
Somewhat off topic. What about the orifice flange idea?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Spool piece required between check and gate valve?
http://www.piping-designer.com/index.php/disciplin...
RE: Spool piece required between check and gate valve?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Spool piece required between check and gate valve?
By far the best,
http://www.piping-designer.com/index.php/disciplin...
Reaction to change doesn't stop it
RE: Spool piece required between check and gate valve?
This problem is easily solved by adding a small spool between the valves, which would be the conservative direction I'd lean. Again, this is more of a big bore piping issue. If these are smaller sized valves this may not apply.
RE: Spool piece required between check and gate valve?
And of course everybody checks(!) for possible disk interferences if using wafer style checks and butterfly valves near each other (especially for large bore), right?