[MW:4966] API 5L X85 -CVN Requirements

[Kathalingam Babu]

Gents,

 

Pls tell me, what is the CVN (Longitudinal) Requirements for the API 5L X85 (19 mm thick) ?

 

Thanks & Regards,

 

K.Babu

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[Bathula Raghuram (Mumbai - PIPING)]

I heard that 44th edition of API 5L has 3 new grades X90, X100 and X120.

what is X85? CVN is mandatory for all PSL2 pipes, refer para 6.2.5.2

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Kathalingam Babu
Sent: Tuesday, April 27, 2010 3:53 PM
To: material...@googlegroups.com
Subject: [MW:4966] API 5L X85 -CVN Requirements

[KOLA Ramalingeswara Rao]

Hi,

As per API 5L - 44th edition X85 grade is not there. For the CVN values refer 9.8.2.3 of API 5L 44 th edition.

 

K.Ramalingeshwara Rao.

[Kathalingam Babu]

There is an intermediate grade called API 5L X85 , it is commonly used in offshore industries.

 

Might be added in next edition of API 5L Spec.

[Carlos Quintini]

Mr. K. Babu:

 

API 5L ,ed. 44, does not request longitudinal CVN test, because due to rolling process for plate production for seam weld pipe or seamless pipe, the grain orientation of the microstructure has the lowest  fracture toughness values  transverse to pipe axis. Therefore, CVN spicemens must be taken transverse to the pipe axis based on the fact that this is the most unfavorable spicemen orientation to obtain the minimum requested absorbed energy values

On the other hand, X85 grade is an intermediate grade agreed for production between purchaser and manufacture

According to table 8 of API 5L, for body full size absorb energy the values for X85 grade can be interpolated according to values for grades X80 and X90 which is 30 ft-lb for pipe diameters from 20 to 36 inches and for test temp of 0°C (32°F), or lower temperature if agreed.

 

For CVN test for seam weld and H.A.Z., according to 9.8.3, the absorb energy value is also 30 ft-lb at 0°C (32°F), or lower temperature if agreed.

 

Carlos Quintini

Quintini Consultores C.A.

Venezuela

2010/4/28 Kathalingam Babu <kathalin...@ppl.com.sg>

[Kathalingam Babu]

Hi Carlos Quintini

 

It is obvious that, the longi specimen CVN values is more than the transverse specimen CVN values.

 

Since if we need to follow ABS Modu code, which calls the CVN test at Weld metal, Fusion Line, 2 mm, 5 mm  ;

 

If i take transverse CVN samples for PQR, will be require more set of pipes to do the CVN tests.

 

From my point of View, it is immaterial, whether we taking Longi or transverse specimen, weldment should satisfy the requirement.

 

Rgds,

 

K.Babu

[Yadav Shiva]

Dear Kathalingam Babu,

                                    
40J (30 Ft-lbf) for pipe in grades > X 80 grade materials & less than 19mm thick. The HAZ for the longitudinal seam weld in HFW welded pipe is usually too narrow to permit accurate sampling for Charpy testing. The requirement for Charpy testing of the seam weld HAZ applies only to SAWL/ SAWH and COWL/ COWH pipe.

--
Yadav Shiva Chelliya,
Inspection Engineer,
Doha Qatar,
+974-6166465