Re: RE: [MW:29134] derivation welds

Greetings,

What i was explaining previously was as per SAES-W-012, welding requirements for pipelines in SA projects, but please refer also international standards as per below.

Thanks.

Standard	Applies to	Minimum distance between weld toes	Notes
BS 2633:1987	Ferritic steel pipework	4t	t= nominal thickness of the pipe See below for notes on attachment welds.
BS 4515:2009	C-Mn pipelines	4t	t= pipe thickness
BS 2971:1991	Carbon steel pipework	Agreed by parties	-
PD 5500:2012	Pressure vessels	4e or 100mm whichever is greater	e= design thickness Refers to staggering of longitudinal welds
ASME B&PV	Boilers and pressure vessels	Not specified	-

Regards,

MOHAMED MUNEEB MAHABOOB

''If you know any art by any means then

SCULPT IT - no matter how cheap or

useless it is - JUST SCULPT IT,

you will never know when experts will

be on demand''

From: Tadic, Miroslav
Date: 2019-02-19 17:19
To: materials-welding@googlegroups.com
Subject: RE: [MW:29133] derivation welds

Dear Sr.

Comment that there aren´t owner specs. We just support in design code regulations.

So, about your information, could you have some code/standard reference to review in detail?

Thanks in advance.

Best Regards

Miroslav Tadic

De: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] En nombre de muneebslsa@gmail.com
Enviado el: martes, 19 de febrero de 2019 02:04
Para: materials-welding <materials-welding@googlegroups.com>
Asunto: Re: [MW:29124] derivation welds

Yes, this is the purpose of orifice? but usually Olets do not come with 45 deg N U or S D, but the tapping connections are supposed to be in flange as what i have seen, anyhow in your case this is encroached, usually encroachment takes place in your scenario.

Basically for SA projects you have to maintain 20 mm or 3 times of the thickness which ever is greater to waive this scenario or if any of those 3 encroached welds have been PWHTed before performing second then exempted.

So whats your owner / cleint spec calls for?

Regards,

MOHAMED MUNEEB MAHABOOB

From: Tadic, Miroslav

Date: 2019-02-18 18:31

To: materials-welding@googlegroups.com

Subject: [MW:29120] derivation welds

Dear group,

Please if you could analyzed the attached image.

It´s pipeline B31.8.

Constructor at first time, welded tube-flanged joint. Then realized that its necessary have an instrument as showed.

The ask is there´re some restrictions for minimal distance between weld joint and derivation in pipe.

Please if you could give some reference in design code.

Thanks in advance

Miroslav Tadic

Integrity Engineer

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