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Re: [MW:34531] Tensile re-test specimen requirement as per API 5L 46th Edition. Cl - 10.2.12.2 (b)

By Materials & Welding

Dear Mr Pravin .
* should in API 5L is mandatory ... for X65 and higher retesting have a special requirements .. heats divided to slabs and each slab may has a different rolling conditions which reflect variation in mechanical properties .
So, API 5L is careful in this issue.

please also check the second mail i sent as a completion of 1st one regarding testing of the slab which has a failed sample     

Best Regards ,
ENG. Ahmed Osman
TEL. Egypt +20 1225880434
TEL. KSA   +966 534311070


On Monday, September 4, 2023 at 08:37:01 a.m. GMT+3, Ahmed Osman <a.osman81@yahoo.ca> wrote:


* if the mother plate have a lot of daughter plates " low thickness pipes "    .. u can determine the 2 plates "before and after"  the failed sample and testing them only instead of testing all daughter plates or eliminating them ( this is for the mother plate of failed sample )

Best Regards ,
ENG. Ahmed Osman
TEL. Egypt +20 1225880434
TEL. KSA   +966 534311070


On Monday, September 4, 2023 at 08:29:59 a.m. GMT+3, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:


Inline image


According to my Interpretation,

1. Mother Coil is the initial Billet/Slab obtained from one Heat of the Furnace.
2. If  2 Heat Niumber (or 2 different rejeated slabs confirmed with Pipe Mill)  exists the word should may be considered as shall else same Heat shall be used for testing.

Thanks & Regards

J.Gerald Jayakumar



On Monday, 4 September, 2023 at 08:41:14 am IST, Pravin Mohite <praveenss224@gmail.com> wrote:


Hi Experts,

Need your advise on the interpretation of statement referred in Cl - 10.2.12.2 (b) of API 5L 46th edition for tensile retest of Gr. X65M SAWL line pipe. 

The statement of this clause which I am looking for your advise is - 'the retest specimen should be taken from two different mother coils or plate, as applicable' 

Below are the queries on this statement :
1. For the word 'should' referred in this statement. Since as per API 5L terms, 'should' refers to recommended practice & does not make it mandatory to manufacturer to comply. 

2. The term referred as 'mother Coils or plate'. Since specification doesn't referring  the term as 'Mother Coils or Mother Plate' , I can consider the other daughter plates from mother plates to take retest samples. 

My interpretation on the statement is - 
'It is not mandatory for the manufacturer to take the retest sample from the two different mother plates. He can take retest samples from the other daughter plates of same mother plates from which initial  tensile test specimen was taken '.

Requesting experts to advise on the interpretation of above statement and opinion about my interpretation.

With regards,
Pravin Mohite
+91 9664 232573




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