Tensile re-test specimen requirement as per API 5L 46th Edition. Cl - 10.2.12.2 (b)

[Pravin Mohite]

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

[james gerald]

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

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[Ahmed Osman]

in case of tensile sample failed

1- the mother plate of failed sample to be tested individually " per pipe "  or eliminated from production

2- the remaining pipes from the heat " testing unit " to be tested by:

        * taking 2 extra samples from 2 different mother plates other than the failed one

        * if the extra 2 samples passed " Ok " for the heat

        * if one sample failed , testing will be individually " per pipe "

Best Regards ,

ENG. Ahmed Osman
TEL. Egypt +20 1225880434

TEL. KSA   +966 534311070

[Ahmed Osman]

* 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

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/582973989.2413010.1693805127945%40mail.yahoo.com.

[Pravin Mohite]

Hi Mr. Ahmed,

Thanks for your response.

I do agree with the first point, but have a different opinion about the second point.

If I am taking re-test specimen from same mother plate from which initial test was failed, it is more stringent for me as I am taking a risk of re-failure and subsequent testing of each pipe it the test fails again

I am having in total ten mother plates (and 40 daughter plates) under same heat 

Since API is referring in statement as 'should' it is not mandatory to take the re-test specimen from other mother plates

 Kindly advise.

With regards,

Pravin

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/1353429586.3586213.1693805358051%40mail.yahoo.com.

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With Regards,

Pravin Mohite.

Cell - 9664232573.

[Pravin Mohite]

Hi Mr. James,

Thanks for the response.

In my case the heat No. is the same but having number of mother plates and subsequently daughter plates.

With regards,

Pravin

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/582973989.2413010.1693805127945%40mail.yahoo.com.

[Ahmed Osman]

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

[Ramamoorthi Thangarasu]

Dear Praveen

First Check Which type of Fluid line we want to use this pipes.API only given Recommended Practise minimum requirements but less than it. 

API 5L /ASTM AS106  common piping material oil and gas industrious 0 to 50 deg. temp.. 

If the mother coil is different, it needs to conform to mechanical and chemical properties if they match no problem.

best regards

Ramamoorthi Thangarasu

Sr.inspection Engineer

TUV Rheinland

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/1592289096.3905615.1693891395563%40mail.yahoo.com.

[james gerald]

Just to add. 

From the below it is self explanatory.

You can understand about the reheat coil below and many Pipes are produced from the Reheat Slab depending on the type of forming and heat treatment as below.

Thanks & Regards

J.Gerald Jayakumar

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/582973989.2413010.1693805127945%40mail.yahoo.com.