Is Re-Qualification Required If We Have Already Qualified WPS?

Certifcation of any kind often has inspection time frames to hold qualifications to process or handle materials, but not always. the certification in your case only relates to safe handling of an explosive or hazzardous material. In most cases the certification process is not affected by minor handling proceedural changes.

A breach or stepping outside of a certification is easily identified -

1) change to materials being handled have an increased risk over that for which you were certified to handle- this would be a fail. if not you are ok

2)is the material though less hazzardous likely to have an impact on the equipment-employees above that of the previous material? if so this is a fail or breach (eg fumes or acid eating through equipment not design for it)

3) is the modification within general engineering minimum strength and laod capacities? if so you are ok

4)is the modification in line with the same manufacturing process that was originally used for the pipes? if so you are ok

5)if the pipe/sections are being checked and passed by radiography the destructive testing is not required if the manufacturing process has not changed as original destructive tests already prove the build design pass. if the materials and manufacturing process have changed then yes you need a destruction test to requalify the product.

6)the electrodes being used as per the original certification are not only ok, they are mandatory otherwise you would have changed the makeup of the item manufacture. the supplier need only supply an electrode certification of their own to show they meet the standards required for their product - be it ISO 9001 - CE - UL or whatever the approval level was of the original electrodes

Finally you state that cirticallity is high - if the certification is for hydrocarbons and this is a hydrocarbon - then the highest critical level would have been considered when granting certification - if it is not a hydrocarbon liquid and is of a critical nature -hazzardous- then you have no certfication to handle it at all.

In that instance you need to find out what the standards are for the new material and see if they are above or below hydrocarbon standards.

The fact you are asking the question is a sign you are a competant manager, I hope this has been of some assistance.

Archie - ISO 14001 Qualified

Life is Enerventure

The WPS need to be changed if any one of the critical parameters have changed. By your data i don't reaaly see it changed.

However the WQR is another matter and it is likely that you have to go through the whole of it. Our WPS are much more than that old and I am sure a few might be even older than 30 years (That's when I came into existence in this organisation) and the are valid, at least the ASME (we are U stamp holders) and Boiler Inspectors have never objected. The processes do vary time to time and even more so the welders and there skill levels, so these are done a bit periodically, depending upon the changes.

UD15

so we need to prepare a test coupon and then all destructive tests(tension, bend etc) again even though we have qualified WPS. As I know for welder qualification we have do welding on test plate then passing this welding though radiography welder will be considered as qualified, so for welder qualification we dont required any mechanical tests in lab. My query is that is it mandatory to prepare test coupon and subsiquently destructives tests as it had been done during construction time of this piping, having qualified WPS with its PQR?

WQR is not only radiography. Of course it depends on the WPS it is being certified to. But most of our welders are being tested starting from visual and ending up in the metallographic the RT and the bend, tensile,... all falling within.

However again as I said, it depends on the WPS.