Insert Valve in Full Pipe
Insert Valve in Full Pipe
(OP)
I need to close off a pipe coming out of a tank in order to replace the pipe. The tank is always full so the pipe is always full (can't take out of service). Are there any specialty valves that will clamp on the pipe, then either pinch off the pipe (10" 304 SS) or cut through/close of pipe? Thanks.





RE: Insert Valve in Full Pipe
Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA
RE: Insert Valve in Full Pipe
Whats the fluid??
Water??? I hope!!
Using CO2 to freeze the fluid (at -109F) a short distance from the tank. Cut the line, down a bit from the frozen plug and insert the valve. Don't overheat the freeze plug, this would be a very bad time for that to occur.
Re-attach the piping and allow the plug to thaw.
CAUTION: Do not freeze near an elbow however.
Done Deal
Good Luck
pennpoint
RE: Insert Valve in Full Pipe
Here's what I'am talking about:
http:/
http://
There are larger capacity systems out there.. Just takes a search.
Best Regards
pennpoint
RE: Insert Valve in Full Pipe
RE: Insert Valve in Full Pipe
RE: Insert Valve in Full Pipe
Some good ideas for you have been posted. Either a mechanical seal (line stop) or a freeze plug may be good. Team Inc is one source of these services, FlowServe http://www.flowserve.com/srvnrepair/line_stop.asp is another and TDWilliamson http://w
Both line stops and freeze plugs have their advantages and disadvantages.
Be careful with freeze plugs with regards to brittle fracture. Another issue with a freeze plug is that you must be able to completely stop the flow in the pipe. A small trickle through your block valve will make it nearly impossible to form the plug.
jt