Coupling attachment on long seam shell
Coupling attachment on long seam shell
(OP)
Dear All,
Is it permitted by Code to welding a coupling 1" in centre line of long seam shell? Is there any additional requirement (except ndt) for this condition?
Thanks for any advice
Is it permitted by Code to welding a coupling 1" in centre line of long seam shell? Is there any additional requirement (except ndt) for this condition?
Thanks for any advice





RE: Coupling attachment on long seam shell
If the vessel operates in the time dependent regime (creep), I would discourage installation of a coupling in a long seam weld. Why? Because of creep concerns related to long seam welds. Knowing this, having a stress concentration in a long seam weld would present long term reliability issues.
RE: Coupling attachment on long seam shell
This is new fabrication, long seam is butt joint Type 1. Shell was made from plate with 0.25" nom thk. Is it comply with bpvc sect 8 div 1?
RE: Coupling attachment on long seam shell
RE: Coupling attachment on long seam shell
RE: Coupling attachment on long seam shell
You are not interpreting the code correctly. Start with UW-14 (a). Beyond this general statement you have clarifications and exceptions.
The requirement for UW-14 (b) refers to single openings meeting the requirements that are specific to UG-36 (c) (3). Does your opening for the coupling meet this? Did you review UG-36 (3) (c)?
RE: Coupling attachment on long seam shell
This opening meet with UG-36(c)(3).
So, it would be charged to UW-14(b)?
RE: Coupling attachment on long seam shell
What does this mean???????? Please use complete sentences.
RE: Coupling attachment on long seam shell
I don't think English is the OP's first language.
Dursosono,
Ask a question and then repharase it and re-ask it a different way changing the word order. That will make it more understandable and easier to figure out.
rmw
RE: Coupling attachment on long seam shell
RE: Coupling attachment on long seam shell
UW-14(a) states that any single opening with reinforcement calculation per UG-37, may be placed in (or near) weld joints without imposing the NDE requirements of UW-14(b) through (c).
UW-14(b) through (c) is specifically referencing opening(s) that are inherently reinforced, more specifically, it is referencing those opening(s) exempt from UG-37 reinforcement calculations as specified in UG-36(c)(3).
UW-14(d) states that opening(s) that satisfy ONLY the requirements of UG-36(c) (3), must meet the radiography requirements specified in UW-14(b)
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RE: Coupling attachment on long seam shell
it's mean, if opening satisfied per uw-36(c)(3) was installed in long seam shell (category A) shall be meet with uw-14(d) due to long seam is more critical than circum joint?
I'll look forward to your replay
RE: Coupling attachment on long seam shell
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RE: Coupling attachment on long seam shell
If the designer performs reinforcement calculations in accordance with UG-37 through UG-42 [for any opening(s)] placed in [or near] a welded joint, RT per UW-51 is not required.
Let me rephrase my earlier reply and address the joint category....
UW-14(a) states that any single opening with reinforcement calculation per UG-37 or UG-39, may be placed in weld joints without imposing the NDE requirements of UW-14(b) through (c). UW-14(a) does not identify the joint category, so all joint categories are implied
UW-14(b) states that when a single opening depends on the UG-36(c)(3)exemption, and does not have reinforcement calculations performed in accordance with UG-37 through UG-42, and is placed in a Category B or C welded joint, RT per UW-51 for a length equal to 3 times the opening diameter is required.
UW-14(c) states that when multiple openings depend on the UG-36(c)(3)exemption, and do not have reinforcement calculations performed in accordance with UG-37 through UG-42, and are placed in a Category B or C welded joint, RT per UW-51 for a length equal to 3 times the opening diameter is required, PLUS the requirements of UG-53 shall be met.
UW-14(d) states that opening(s) that depend on the requirements of UG-36(c)(3), and are placed closer than 1⁄2 in. (13 mm) from the edge of a Category A, B, or C weld for material 1 1⁄2 in. (38 mm) thick or less, must meet the radiography requirements specified in UW-14(b)
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RE: Coupling attachment on long seam shell
Let me try to concluding your statement.
1. If we have an opening that placed in long seam shell (category A), we have two choice either UW-14(a) or UW-14(d)?
2. If the opening in point 1 above does not calculate per UG-37 through UG-42 we only have one choice that is UW-14(d)?
Am I correct?
RE: Coupling attachment on long seam shell
Yes, that is correct.
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