looking for some existing fixturing or ideas on how to hold a very tight tolerance on butt welding a 4" fitting to 4" o.d. tubing with a perpendicular tolerance of .015"
we are tig welding and our current tolerance is .032" on this dimension, thank you in advance
Folks
for ASME-BPE Certification it is required for tack welds to be certified, similar to full GTAW welds.
the welders are to be certified Section IX as full welds are.
not an issue, however does any one know how to qualify the welds? you obviously cannot bend test
thank you
thank you everyone for your responses
this will help get me going, i cannot show you the complete assembly as the assembly has a pattent
FEA Way - yes plastic deformation is the goal here, thank you for the info.
i am struggling with "Elmer" software, but if there is another FEA software anyone...
Forum Folks
see attached...i have a bracket w/1500 psi of pressure hitting the point shown
it is held in place with the static pin also as shown
we need this bracket to deform slightly yet not "bend" out of shape.
the bracket is .730" thick...everything is in inches
as of right now this thing...
danw2, thank you for the reply and link to this article
I had no idea this article was out there, have met 2 of the authors at the BPE meetings
thanx again.......!!
hey folks
we currently have a job that must meet B31.3 spec/code..
piping no issues, straight forward
what about sanitary tubing and fittings? which most sizes have a .065" wall
and are for the dairy, sanitary, beverage and pharma, industries.
tubing is talked about, but is tubing covered under...
Ya I know BronYrAur
I am 3rd or 7th down the line away from the designers on this.
we are not the pump people on this one. all I want to see is the PSI to make sure our connections can hold up
to the requirements. All I know is 3.834 i.d. X .083 wall tubing, with clamp connections
customer is...
All
I have the following: 3.834 tube i.d., with 280 gpm (assuming water).
I need to know the psi running thru this system, nothing seems cut and dried, pressure drop is miniscule
things are off the charts in Crane's
any direction would be nice...
as always thank you
Thanx Edstainless
not a plastics expert here, not sure how the Teflon seats are constructed
but I do have new info.
the failing valves are exposed to a cycling of the temperature from 40 degrees f to 265 degrees f
in the same process line same valves with a consistent temp are not failing...
thank you for the responses
ok a little more details, it seems like the Teflon is deforming and cannot close
looks like it is getting forced out (think squeezing playdoh)just not that extreme
as the pressure/temperature is within spec, I am thinking a chemical reaction, I don't know what else
is...
Guys
I have a sanitary ball valve where the Teflon seats are failing. product is propylene glycol running at 250 f and 100 psi
other products run at these temps and pressure with no issues
we are new to propylene glycol, but what I can find Teflon should be fine with this chemical
are there any...
