Problems for SS304 legs on SS904L vessel?

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Makrand Sakpal

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May 24, 2016, 11:50:43 PM5/24/16
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Dears,


We have one atmospheric hygienic (Food Industry) vertical vessel of SS904L material which is supported on legs. Vessel diameter is 3200 mm & TL-TL is 5100 mm.


The question is, can we weld SS304 directly on SS904L so that we can use SA-312 TP304 pipe l;eg supports?


Is it necessary to have SS904L RF pad instead of SS304?


Can there be an issue with weldability of SS904L with SS304?


Note : - We can’t go for skirt support option.

Prakash Hegde

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May 25, 2016, 12:09:28 AM5/25/16
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Hi!
Yes you can weld directly ss304L to Ss904 as it is a support and not coming in to contact of service atmosphere
Regards
Hegde


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George Dilintas

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May 25, 2016, 4:57:13 AM5/25/16
to Meghanadh K
SS904L is a superaustenitic grade. You can weld it directly to 304. No risk of low FN

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Mohd Siraj

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May 27, 2016, 12:14:23 AM5/27/16
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what filler to be used for joining?

is 308L is okey?

Prakash Hegde

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May 27, 2016, 1:11:29 AM5/27/16
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Hi!
You can weld by E308L consumables but you require to qualify PQR due to different P no
Regards
Hegde


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Kannayeram Gnanapandithan

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May 27, 2016, 2:40:58 AM5/27/16
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It is better to go for  ER385

THANKS & BEST REGARDS,
KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349

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George Dilintas

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May 27, 2016, 10:55:22 PM5/27/16
to Meghanadh K
no problem with 308 in that case

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Makrand Sakpal

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May 30, 2016, 5:51:13 AM5/30/16
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Dear all,


Thanks for your inputs.


This tank we are using for food storage (Extreme Hygienic).


Please tell me what are the issues if we weld SS904L with SS304? SS904L have low carbon while SS304 is having high carbon content.


Will there be any issue of iron contamination in future which may be non-hygienic for food applications?

dili...@gmail.com

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May 31, 2016, 10:56:20 PM5/31/16
to Makrand Sakpal
Iron contamination is related with destruction of surface Cr oxide. No risk in your case, just grind and pickle as usual

Sent from my BlackBerry 10 smartphone.
From: Makrand Sakpal
Sent: Δευτέρα, 30 Μαΐου 2016 - 12:51
To: Materials & Welding
Subject: Re: [MW:24907] Re: Problems for SS304 legs on SS904L vessel?

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