Txs Alan, what about HICC, does it occur only in weldments
There is a danger that the discussion is getting confused. Confirming what Ahmed Eissa wrote:
Hydrogen induced cracking (HIC) – using this term strictly in relation to the behaviour of carbon and carbon-manganese controlled rolled steels to crack where the process fluids contain relatively small quantities of hydrogen sulphide (and not the many other types of cracking related to hydrogen in steels) is unrelated to hardness. It is due to the presence of elongated manganese sulphide inclusions in the steel (type II manganese sulphide inclusions) which provide sites for the accumulation of atomic hydrogen which then form molecular hydrogen which fractures the steel, causing cracking or blistering.
Sulphide stress corrosion cracking of steels is again due to hydrogen sulphide and the factors are the concentration of hydrogen sulphide (partial pressure thereof) the pH of the solution and the susceptibility of the material, commonly assessed by its hardness. NACE MR0175 relates to this type of cracking.
Alan Denney
AKD Materials Consulting Ltd
From: materials-welding@
googlegroups.com [mailto:materials-welding@googlegroups.com ] On Behalf Of George Dilintas
Sent: 27 September 2016 08:12
To: Meghanadh K <materials-welding@googlegroups.com >
Subject: Re: [MW:25457] RE: 25392] PWHT
It is controlled by the crystalline structure and more specifically:
- by the diffusion of atomic hydrogen
- by the capability to sustain the pressure of molecular hydrogen by plastic transformation
The increase of hardness is an indication of low ductility and thus less possibility of plastic transformation of the grains
2016-09-26 19:25 GMT+03:00 'Ahmed Eissa' via Materials & Welding <materials-welding@
googlegroups.com >:
Regarding the belowmentionedI need to confirm that HIC is not controlled by hardness control but by steel chemistry
All shall be reminded that wet sour service induce
Sulfide stress cracking
Hydrogen induced cracking
Stress oriented hydrogen induced cracking
Hydrogen blistering
Nace MR 0175 or nace MR 0103 only control ssc, please read these code introduction /preface
Ahmed eissa
Materials and Corrosion Engineer
On Thu, 15 Sep, 2016 at 5:38 am, pgoswami
<pgoswami@quickclic.net> wrote:
Hello, ZHY370137,
I'm not sure why you're asking this question is general forum, when your contract is bound by your clients' specifications and project requirements. Aramco has very comprehensive specifications for almost everything. If Aramco SAES-W-012 is applicable for your project you need to what's needed as per this spec.
What's the design code, of the pipeline B-31.4 or 31.8? And what're the Aramco specifications applicable?
Usually for sour service hardness control is "mandatory" to mitigate the HIC. One of the effective ways to ensure hardness control is PWHT, unless vendor is able to prove otherwise.
Appreciate your response.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
From: materials-welding@
googlegroups.com [mailto:materials-welding@googlegroups.com ] On Behalf Of zhy370137@gmail.com
Sent: Wednesday, September 14, 2016 10:59 AM
To: Materials & Welding
Subject: [MW:25392] PWHT
Dear sir
good day
pls hlep us confirm whether we need apply PWHT for every girth weld according to your experience.
pipe ：API 5 L X60 HIC resistant pipe
welding method: CRC automatic
pipeline diameter and thickness:20inch 0.4inch(10MM)
medium：sour condensate
pressure:960psi
pipeline distance：164km between two gas plant in saudi （safaniya plant to berris gas plant)
client：saudi aramco
CNPC daqing saudi
QAQC
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Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
A.I.S, A.N.I, IRCA Lead Auditor
Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
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