Re: [MW:28480] Dissimilar thickness material for PQT

Check Fig. 328.4.3 of ASME B 31.3

328.4.3 Trimming and Permitted Misalignment

and

Fig 127.3 of ASME B 31.1 

(C) Alignment. The inside diameters of piping components
to be butt welded shall be aligned as accurately
as is practicable within existing commercial tolerances
on diameters, wall thicknesses, and out-of-roundness.
Alignment shall be preserved duringwelding. The internal
misalignment of the ends to be joined shall not
exceed 1⁄16 in. (2.0 mm) unless the piping design specifically
states a different allowable misalignment.
When the internal misalignment exceeds the allowable,
it is preferred that the component with the wall
extending internally be internally trimmed per
Fig. 127.3. However, trimming shall result in a piping
component thickness not less than the minimum design
thickness, and the change in contour shall not exceed
30 deg (see Fig. 127.3).

---

 

From: Ri@z

Date: 2018-10-22 14:10

To: Materials & Welding

Subject: [MW:28477] Dissimilar thickness material for PQT

Dear All,

I want to carry out a PQR with thickness  7.84 mm P1G1 to P1G2. But material available is API 5l X52 of 7.84 mm and API 5L X65 9.5 mm 

7.84 mm to 9.5 mm 

Is it ok to prepare PQT test coupon with 1:4 taper(Slope) ?  

My client insisting to reduce ID at least  75 mm . Is it really required to reduce ID ?

Please help. 

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
Visit this group at https://groups.google.com/group/materials-welding.
For more options, visit https://groups.google.com/d/optout.