Materials & Welding: RE: [MW:31340] Re: Impact test requirements for LAS

Wednesday, August 19, 2020

RE: [MW:31340] Re: Impact test requirements for LAS

Yes, it is understood, in an arctic environment like Russia, for example, the low temperature excursion is present in the services. But, if the process where the SA-335 P9 pipe is installed serves a furnace, boiler, reactor or incinerator operating in the creep and oxidation range; typically, the engineering specification indicates pipeline protection with traces of heating and thermal insulation that suppresses freezing.

Ramon Briceno/ Corrosion-Materials & Welding Engineer

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From: Raghuram Bathula
Sent: Wednesday, August 19, 2020 1:16 AM
To: Materials-Welding
Subject: Re: [MW:31338] Re: Impact test requirements for LAS

Please go thro the previous discussions on the subject

These conditions are applied in particular where ambient temp is very cold, for e.g Russian region MDMT can go upto -50 deg c.

https://groups.google.com/g/materials-welding/c/8jeOH8HSlPs/m/Ph0x9G_6ljUJ

On Wed, 19 Aug 2020 at 09:58, Paidi <bobsuresh24@gmail.com> wrote:

Well said... Exactly.. Coarse grained steel does not required Imoact test requirements unless until service is different than normal... Cryogenic and all

On Wed, 19 Aug 2020, 09:39 Customer Care, <bricenori@hotmail.com> wrote:

Dear Kiran,

It is rare that a low Cr-Mo alloy steel such as Group P5B is required to have an impact test at -29 C in its weld.

These steels are resistant to high temperatures of approximately 470 C to 650 C. So for what impact test? Structurally, for high temperature service a steel with a coarse grain size ASTM 4-5 (creep and oxidation resistant) is needed; and for low temperatures, tough steels with fine grain structure ASTM 8-9 are needed, which are suitable for cold service> -29 C to -45C.

The steels grouped in P5B are coarse-grained.

ASME B31.3 does not call for impact test at this temperature -29C. First of all, Kiran you must check the service temperature range of this pipe and its welding. What is approved in the Customer's specifications? I think your Customer is wrong. Talk to him.

Regards,

Ramon Briceno/ Corrosion-Materials & Welding Engineer

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From:
Sent: Tuesday, August 18, 2020 3:36 AM
To: Materials & Welding
Subject: [MW:31328] Re: Impact test requirements for LAS

Dear Experts,

Please I need your answer to my above query.

My client has mentioned the above 25 mm Impact test would be required, in accordance with B31.3.

Question: Are materials, for which a temperature of −20°F (−29°C) is listed in the Minimum Temperature column of

Table A-1, exempt from impact testing for any combination of thickness and temperature above −20°F (−29°C)? Reply: Yes.

The minimum temperature in our scope is not below minus 29°C. If B31.3 calls for impact test within this temperature.

Your feedback is very important to me.

On Tuesday, July 28, 2020 at 10:12:01 AM UTC+5:30 K K wrote:

Dear Experts,

Please look into my query, please give me your response on my doubt.

Thanks

Kiran

On Monday, July 27, 2020 at 11:29:05 AM UTC+5:30, K K wrote:

Hi Experts,

"Good Morning"

My query has below.

Help me to prepare pWPS.

Process : GTAW +SMAW

Material : P.No - 5B

ASTM A335 Grade P9.
Pipe Size - 16" Sch-60.
Thickness: 16.66 mm
Thickness range: 5mm to 33.32 mm
According to ASME B31.3 Table 323.3.1 shall I required an Impact for the above-mentioned thickness and material.
As per my knowledge, the above 25 mm impact test would be required.
How I can find according to line class where impact test required or not.
If a minus 29° C impact test not required for LAS.

When we shall consider the impact test exemption.

And regarding consumable for P No- 5A

ASTM A335 Grade P22

if I use ER90S-B3 ok or shall I use ER80S-B3 because my client suggest me to use ER80S-B3 please clarify way?

Thanks in advance

Regards

Kiran

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