Weldolet - Allowable Pressure
Weldolet - Allowable Pressure
(OP)
Hi,
If I am using Bonney Forge Weldolets (specifically manufactured to MSS-SP-97 standards), are pressure calcs required for the fitting?
I have already found the straight pipe allowable pressure & corresponding wall thickness to EN13480-3. Are Weldolets certified to cover the pipe's calculated allowable pressure?
Thanks
(Sorry, new to this site & already posted this thread in Mech Eng - Other topics)
If I am using Bonney Forge Weldolets (specifically manufactured to MSS-SP-97 standards), are pressure calcs required for the fitting?
I have already found the straight pipe allowable pressure & corresponding wall thickness to EN13480-3. Are Weldolets certified to cover the pipe's calculated allowable pressure?
Thanks
(Sorry, new to this site & already posted this thread in Mech Eng - Other topics)





RE: Weldolet - Allowable Pressure
"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.liv
RE: Weldolet - Allowable Pressure
Line pressure ranges from 4 - 16 bar. I've already emailed Bonney Forge, asking if they can certify a specific allowable pressure per fitting, or certify that it will match (or exceed) the straight pipe calcs.
Just trying to work out if I need to do calcs, and if so, where do I find Weldolet formulae?!
RE: Weldolet - Allowable Pressure
"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.liv
RE: Weldolet - Allowable Pressure
MechD, to add a bit of additional information.. you don't need to do branch reinforcement calcs, because the weldolet is precertified for a given pressure.
If the branch connection to the pipe was instead fabricated, using say, a welded pad, then yes you would need to do the branch reinforcement calc from the appropriate B31 code.
RE: Weldolet - Allowable Pressure
As people had mentioned Weldolets are pressure rated so as long as you specify the weldolet with the correct pressure rating above your pressure then "job's a good one". There is no need to perform calculations as these fitting designs have been proof tested by the fabricator. Branches are integrally reinforced so no calcs required.
RE: Weldolet - Allowable Pressure
RE: Weldolet - Allowable Pressure
On page 7 of that catalog you'll find a couple sections which are useful:
HOW TO ORDER BRANCH CONNECTIONS
HOW TO SPECIFY BONNEY FORGE BRANCH CONNECTIONS
See also TEMPERATURE - PRESSURE RATINGS on page 8 and the Engineering Specifications section which begins on page 32. I've often seen excessive welds on weldolets - see the distinction between the "rib" and "weld line" on page 35.
jt
RE: Weldolet - Allowable Pressure
RE: Weldolet - Allowable Pressure
rmw
RE: Weldolet - Allowable Pressure
Well if a 200Lb O-let is good for the same pressure rating of Sch 80 pipe and a 3000 Lb O-let is good for a the same pressure rating as Sch 160 pipe that to me means that the O-lets are "Pressure Rated" in a sense. If they are not "pressure rated" then you would not be able to select an O-let to use!!!
RE: Weldolet - Allowable Pressure
"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.liv
RE: Weldolet - Allowable Pressure
RE: Weldolet - Allowable Pressure
When you say "If you selected the correct pipe sizes for your service the fitting will be OK" this is not strictly correct. (e.g. I could select a 4"nb pipe Sched 40 which is OK for the service but if the pressure is high enough then the thickness would be no good.) I beleive you should have said " If you selected the correct pipe schedules/thicknesses for the pressure service then the fitting will be OK"
RE: Weldolet - Allowable Pressure
some firms don't know how to order material.
(I don't see any problem in w'lets up to 16 barg.)
Greetings
RE: Weldolet - Allowable Pressure
"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.liv
RE: Weldolet - Allowable Pressure
RE: Weldolet - Allowable Pressure
Finish a job, get paid and move on to the next one.
I don't fill in the hours block, so the client just gets a /0 error there. Sometimes its big, sometimes its small, but it's always my problem, not the client's.
"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.liv