[ollie]

• Attach a split 30 x20 tee
• Weld on a FB flanged by weld ball valve ( this would be a specialty item ie a modified Flg. BV )
• Attach hot tap drill to Flange face of BV
• Open BV
• Drill hot tape
• Withdraw drill
• Close BV
• Continue branch connection from Flange face of BV

[ollie]

Thehat
I never said the answer of pup length is in the Specs . Have you checked can you substitute the LR for SR El? What did the engineer say that ultimately will take responsibility for the project.
Side bar
If you take feelings into a design office someone is sure to hurt them

[ollie]

thehat ,It is not a glib answer. What you should realize that companies have standards. One company may request a 100mm min length pup, they may ask for a certain arrangement for their utility station a minimum with draw length on an exchanger .You get the idea?
I am not saying that this web page is the wrong place to ask question, but be aware your lead piper is the one that sets the company standards for his drawing office team. I would never allow one of my pipers to search the web for a question that is stated in the client or company specs. Ask questions within your team; remember the guy that signs your timesheet normally knows the right answers.[/b]

[ollie]

The minimum length is normally 500mm. This is dependent on the steps made to transition between the thin wall underground pipelines steel to the B31.3 refinery material used on the S bends. Assuming that you are inquiring about the TP prior to a pigging station. Not being sarcastic as we have so many delicate readers, but don’t they have engineers where you work?

[ollie]

The length of pups’ rule of thumb was 1.5dia or min 6″ (152 frog dimensions) the length is based on fabrication .Anything less then 6″ of 4″ pipe is hard to do field end preps and field welds.
Did you skip the piping course?

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