Dear Forum,
What does the welding detail mean in attached file ?
Weld on arrow side ? But what are circle and arch like markings adjacent to "V" ?
And what weld joint efficiency it would need E=0.9 from ASME VIII Div 1 - Table UW 12 ?
Dear forum,
There is a vessel constructed to an ASMVE VII div 1 code (At least as datasheet says).
Vessel nozzle spec says: 4", wall thickness 1.305"
But, in schedule table there is no 4" pipe having thickness 1.305".
Maximum thickness for 4" pipe is 0.674" = 17.12mm (XXS).
Having done...
Dear forum,
I have I noticed a following - a flange face and flange interior have different magnetic properties rather than its outside surface....
The magnet sticks strongly to a flange from outside and very weakly to a flange face ....
Vessel Nozzle neck has the same behavior - from outside...
Dear Forum,
Your advise is needed.... in what cases the flange faces are coated ?
I have a spec where 20 mills coating thickness is specified on sealing face of a flange (RF flange ).... 20 mills makes 0.5mm and this is the order of depth of the flange face rings.
Isn't the sealing capability...
Dear All,
Can you advise me any resource link for learning API 579 FFS-1 general / local metal thinning case study... with some basic examples / calculations....
Thks
Dear Forum,
What would be your thoughts on following deterioration (photo attached).
Piping is 2" (Wall thickness ~5mm) 316 SS in Marine environment for a long time under ~ 200 bars
Dear forum members,
There is a leak (multiple pin holes next to each other) on a 2" line which is heavily corroded (operating pressure 2 bars, oily water).
The line can not be shutdown for a long time (10-15 min), leak is close to U bolt support, surface is very corroded...
Is there some...
Dear All,
What is the analogy (if there is) of API 570 but for non-metallic piping ?
What are the NDT methods / code /standards of its integrity check ?
Does PCC-2 cover the repair of non-metallic piping as well ?
Thank you so much
DEar All...
There is a flange to be welded to a 2" pipe ...
Pipe end was beveled (preparation prior to welding), normally what NDT is performed - (if is performed) on beveled end prior to welding?
Thank you
Dear All,
Attached herewith the nozzle to shell weld detail (set through)...
Could you please have a look and advise that the shape of bevel i draw next to the drawing is correct way i understand it...
Also what is the "arc"-like marking on the drawing ?
Thank you so much
DEar All,
Could you please advise me please any link / resource where i can find examples of piping composite wrapping (temporary repair) calculations ?
How many layers depending of piping / fluid parameters ... In fact PCC-2 practical application examples
Tank you so much
Dear All,
Carbon Equivalent (CE) number defines the weldability of the steel, the lower CE the better weldability,
Is there a table for CE for known steel grades? and if no why ?
There is a formula for calculation CE=C+(Mn/6)+((C+Mo+V)/5)+((Ni+Cu)/5)
If we take for example a 316L SS that is...
API 510
Question one:
8.3.1 Permanent Repair Techniques
Typical permanent repair techniques include the following.
a) excavating the defect and blend-grinding to contour in accordance with API 579-1/ASME FFS-1 (also refer
to ASME PCC-2, Article 304 for guidance on flaw excavation and...
Where is a reference / guidance for suitable timing for post weld nde - depending on various factors: thickness, low/high Hydrogen electrode, preheat / interpass temperatures etc etc ?
Dear All,
I have a dummy question ....
What are the references for welding a weld neck flange to pipe - in terms to what NDT to be done and where and when?
Root pas ? subsequent passes ? What is the NDE requirements depending of fluid service ?
Code of construction is B31.3
Gents,
What is a an option to repair 18" weld neck flange weld joint to pipe? There is a water seepage pin-hole in the weld.
Temporary / permanent repairs options ?
Dear All,
For pipe thickness calculations:
API 574 says for metallic pipe for which t ≥ D/6 or P/SE > 0.385 requires special consideration.
What is this special consideration? Where shall i find it ?
ASME 31.3 Para 304 Straight pipe under internal pressure says:
For t ≥ D/6 or for P/SE >...
Dear All,
Your opinion needed:
This is an elliptical horizontal vessel head-to-shell weld which developed a corrosion ~ m long.
Vessel thickness 15mm, corrosion allowance 3mm depth on marked location on photo is 5mm, rest of the pits are shallow.
What would be your opinion?
As per API...
Dear Forum,
Are pressure vessel corroded / pitted welds repaired by belzona ?
Is there any threshold pitting / corrosion metal loss in weld up to some value to be repaired by belzona and after some threshold by belzona?
Thanks
Dear All,
API 510 code says for pitting assessment that pits even if they go beyond corrosion allowance might be acceptable if they do not penetrant into half of required thickness and not "that much wide" :
"During the current inspection, widely scattered pits may be ignored as long as all of...
