Pipe Crimping. 3

[Frank1344]

Hello Folks,

I have never heard about the subject before.

Would anybody please explain what it means and when it is used?

I appreciate any help.

Thanks,
Frank

 

[MikeHalloran]

Round heating/ventilating pipes are commonly crimped at one end, so the crimped end will slide into the uncrimped end of the mating pipe. Then duct tape is applied over the joint.

A manual crimping tool looks like a pair of pliers with multiple alternating jaws that slide next to each other. When the jaws close on a pipe edge, they corrugate the edge for a few cm, reducing the effective OD of the pipe. Rotary crimping tools do the same thing to the pipe, more quickly.

There may well be some other context in which a pipe is crimped, but that's the only one I know about, and you gave us absolutely no clue about where you heard the phrase.



Mike Halloran
Pembroke Pines, FL, USA

 

[Frank1344]

Thanks for the reply.

The crimping is going to be executed on the downstream of a globe valve which is the by-pass for a control valve station.

 

[MikeHalloran]

Hmm... That sounds like someone is going to crush the pipe in a big ol' vise.

I guess it's an alternative to opening the globe valve by N.X turns to restrict the bypass flow, and then wiring the valve handle so nobody changes the tuning.

I've seen similar things done on boats, but class societies don't like to see wired valves, so I've used drilled orifices, sometimes hidden from view so random twiddlers can open the valve all the way without harm.





Mike Halloran
Pembroke Pines, FL, USA

 

[Frank1344]

Thanks again.

Is stoppling the line similar to crimping it?

To my understanding so far, it seems we want to restrict/stop the flow?

Thanks.

 

[MiketheEngineer]

If you want to stop the flow - just "crush" the line flat. That is a form of crimping. In my experience you can/will reduce the flow a lot - but probably not completely.

 

[bimr]

Where a redundant pipe needs to be permanently isolated, crimping may be used.

http://www.furmanite.com/services/o...al-applications/crimping-and-valve-line-kill/

An alternative technique for capping an out of control oil well is to mechanically crimp the well-head pipe. Mechanical crimping of the pipe is not widely used, however, since mechanical crimping may crack the metal casing of the pipe. During the Deep Water Horizon oil spill, the well continued to leak because the pipe crimper mechanism failed.

Smaller diameter plastic and copper pipe may be crimped more easily.

 

[C2it]

Crimping is used in fairly arduous situations ....

In a typical methanol reformer unit, crimping is used to isolate pigtail connections to a failed catalyst tube (there are around 750 x 8"tubes), and thus avoid an extended shutdown. Pigtails operate at 750 to 950 deg C and are usually around 2"nb.

 

[btrueblood]

There are pipe/tube joining systems that use a crimping tool (Victualic's "VicPress" system is one), though this does not sound like what the OP is describing.

 

[MikeHalloran]

Uh, Frank, when you fully understand the context and purpose of the crimping, please do come back and explain it here, so we may all learn from you. Thanks.


Mike Halloran
Pembroke Pines, FL, USA

 

[Frank1344]

Mike,

Sure, will do.

So far I know TEAM Industrial Services has been assigned to do the crimping.

What you said is right and the globe valve is leaking so the flow is going through control valve and bypass at the same time and causes issues for operation to the extent that they are experiencing hammering in the system.

The intention is to crimp the pipe downstream of the globe valve so no flow can go that side.

That's all so far, if I come across more detail on crimping procedure, special tools or any other useful info will share it here.

Cheers.

 

[dicksewerrat]

Maybe the valve should be replaced?

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[hydtools]

Here is an example for pinching/squeezing PE pipe:

http://www.regentools.com/feature.htm

Ted