Dummy spool fabrication
Dummy spool fabrication
(OP)
Can somebody direct me how the minimum lenght of small pup should be to fabricate a dummy spool?
Some experienced piping engineer said 1,5XD is a minimum lenght. Which code stats that?
Thanks for your help and answers.
Some experienced piping engineer said 1,5XD is a minimum lenght. Which code stats that?
Thanks for your help and answers.





RE: Dummy spool fabrication
However i will offer the following:
A- The "Dummy Spool Piece" by definition is intended to replace something else and therefore should have the same length as that other item.
or
B- The minimum length of a "Dummy Spool Piece" needs to allow for bolt/stud removal and wrench clearence.
or
C- The minimum length of a "Dummy Spool Piece" needs to be fabricated with 1" minimum between welds.
or
D. Other factors
Which one best fits your situation?
RE: Dummy spool fabrication
When I have designed spools, the bolted type with either a RTJ or RF profile, obviously you need the distance in the saddle long enough to accept the bolting, wrenches for make-up and clearance. I have typically added the length of a socket head plus an inch times two, one for each flange bolting. I believe this works out "roughly" less than 1.5D, but not by much.
Approach the design by using practical sense. What is needed to get the spool into position, then secured?
Hope this helps.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Dummy spool fabrication
RE: Dummy spool fabrication
RE: Dummy spool fabrication
I apologiise for comming back to make my question understandable.
In fact in many cases, during fabrication shop we need to extand spool by means of adding a small pup, whatever the reason. So it seems that this pup does not come over 1.5D in length . My concern is to know the code requieres that or that is just an agreement between client and the contractor .