Hi,
For double grooved and roller expanded tube to tubesheet joints on a shell and tube heat exchanger, what tube hole groove DEPTH are you using?
Thanks!
Hello,
Is it considered good/sound engineering practice to design a pressure vessel nozzle utilizing a long weld neck flange and a reinforcing pad? You don't see this combination very often and I am assume there must be a reason.
Thanks
Hello,
Has anyone had success roller expanding 2205 duplex tubes in a 304ss tubesheet? (tube yield is approx. 60k / tubesheet yield approx. 30k)
Tubeside gas has some hydrogen content.
Thanks!
When welding tube to tubesheet joints in the vertical 3G position, what is the proper weld progression? Can I start at one point and weld 360 degrees around the tube to completion (uphill then downhill.) Or should I start at the bottom and weld upward 180 degrees stop, then start at the bottom...
Hello,
I am looking at a fillet on 304ss material that was welded with GMAW pulse. Some welds appear to have dark discoloration - see attached picture. Is this normal?
Thanks,http://files.engineering.com/getfile.aspx?folder=be7fd2ca-1808-4ace-bea9-9a1bcaf863e0&file=55248.jpeg
When reading UHA-51 and the terms "base metal, weld metal and HAZ" are used, is this referring to components that are only welded? In other words, non-welded pressure containing components do not apply?
Thanks,
Brian
Hello,
If I have a shell and tube heat exchanger that has a non-welded (TEMA Type BEU) 2205 Duplex tubesheet, is impact testing required if the tubesheets is 1 1/2" thk?
Thanks!
If I back weld a stainless steel joint butt joint with FCAW would I then need to grind, gouge and clean up the opposite side prior to welding? Or should back welding limit the oxidation and sugaring?
Thanks!
What is the preferred shielding gas when using GMAW Spray? We typically weld carbon steel at < 1" thk. and x-ray weld quality is required.
We currently utilize the two different gases below but with less success with option #2.
1.) 98% Ar / 2% O2
2.) 90% Ar / 10% Co2
Thanks!
Hello,
For vertical pressure vessels that has a skirt with base plate support can I utilize a JE = 1 in my required lower skirt required thickness calculation? Assume the skirt is welded directly to the base plate with a fillet weld only.
My intent is to use a JE = 0.6 (butt weld joint) for...
Hello,
Many gasket manufactures advertise bolt stress value from 30,000 psi to 60,000 psi for bolt torqueing purposes. Is there any concern that if I torque a stud to 50-60 ksi stress you may actually yield the flange that is being bolted? In other words the high torque value of the studs would...
I understand that a F shell TEMA type heat exchanger is specific to thermal designs where there is a temperature cross. Is it possibly that the temperature difference between the shell side inlet and outlet temperature be to great for this type of design? For example: Lets say my fluid...
Hi, Can anyone tell me how to extract the detailed MAP (New and Cold) detailed calculations from ASPEN mechanical calculation program? All I see the summary output.
Thanks,
Hello,
When building a replacement heat exchanger bundle or a replacement part like a bonnet for an ASME Code Section VIII heat exchanger that was originally designed and fabricated to a previous edition of the ASME Code (ex. 1980 edition), is the manufacturer required to perform NEW ASME Code...
When performing an ASME code hydrotest on a heat exchanger with body flanges designed with spiral wound gaskets I have noticed that during the initial test all joints are leak free. But once the pressure is reduced and the test is repeated the following day those same leak free joints appear to...
Looking for suggestions on how to reduce my weld and HAZ hardness readings when using GMAW Spray on carbon steel material. I often see readings well above 250 BHN on a wide range of thk.
Thanks,
Uglyspec
