Dear Pradeep,
Thanks for information,
Material we intent to purchase is API 5L line pipes and A106 pipes for SOUR service, these product specification are listed in NACE MR0175.
Manufacturer has confirmed that Value of nickel content on product analysis will be less than 1%, Sulphur will be 0.004% Maximum, CE value will be less than 0.38 and material will be supplied in ‘’ Normalized formed’’ condition.
But still they deny to declare the compliance with NACE MR0175/ISO 15156, they say that ‘’ Only hardness according to NACE MR0175/ISO15156’’ will be reported on mill test certificate.
I was trying to find out the restriction NACE MR0175 set forth for API 5L and A106 material, all I could find was restriction on nickel, sulphur and delivery condition(i.e. hot forming or Normalizing etc) which have been complied with by the manufacturer, but still they deny to declare the compliance with NACE MR0175 which left me confused.
Could you please put some light on this issue.
REGARDS,
SYED MOIN
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: Monday, September 27, 2010 5:48 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:7227] NACE MR0175
Hello Syed,
If you look at the end of MR-0175,Part-2, 2003-version, the list of accepted materials for sour service are listed. There are specifications for a few seamless pipes also.
Coming back to your query: Material According to NACE MR0175’’—Implies that all the requirements of MR-0175 have been met by the manufacturer and the material is fit for sour service. If one goes through in details, MR-0175 provides the guidelines of what tests to be asked for sour services. See the sample below-ANNEX-E.
The second option specified by your manufacturer:- Hardness according NACE MR0175—does not make any real sense, this means they would conform to 22 HRC(248VHN) hardness requirements as required by the spec at the point of supply.
What’s the specification of Pipes to be purchased??. If it’s covered in MR-0175then the supplier has to stick a manufacturing and Q.A program meeting NACE MR-0175.If it’s newer materials, it requires qualification to MR-0175.
It would be good if you read the MR-0175 and specifically ask for the applicable clauses, for your application, then it will put the mills on the hook.
Thanks.
Pradip Goswami,P.Eng.
Welding & Metallurgical Engineer/Specialist
Email-pgoswami@sympatico.ca,
5 Purchasing information
5.1 The preparation of material purchasing specifications might require co-operation and exchange of data between the equipment user, the equipment supplier and the material manufacturer to ensure that the material purchased complies with NACE MR0175/ISO 15156-1 and this part of NACE MR0175/ISO 15156.
5.2 The following information shall be provided:
· preferred material types and/or grades (if known);
· equipment type (if known);
· reference to this part of NACE MR0175/ISO 15156;
· acceptable bases for selection of materials for SSC resistance (see Clause 7);
· requirements for HIC resistance (see Clause 8).
5.3 The equipment user and the equipment supplier/material manufacturer may agree that carbon or low alloy steels other than those described and/or listed in Annex A may be selected subject to suitable qualification testing in accordance with Annex B and NACE MR0175/ISO 15156-1. The qualification requirements may be extended to
include resistance to SOHIC and SZC.
If the purchaser intends to make use of such agreements, extensions and qualifications, the appropriate additional information shall be clearly indicated in the materials purchasing specification. This information may include
· requirements for SSC testing (see 7.1, 7.2),
· service conditions for specific sour service application, and
· other special requirements.
5.4 Annex C describes how to calculate the H2S partial pressure and Annex D gives guidance on how to determine the pH-value of a fluid.
5.5 The information required for material purchasing shall be entered on suitable data sheets. Suggested formats are given in Annex E.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ramprasad Chari
Sent: Monday, September 27, 2010 12:00 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:7209] NACE MR0175
If the mill supplying a seamless pipe is pre-qualified to supply NACE pipes,you need not carry out SSC test.Mill shall indicate NACE conformance on their TC including Hardness values.Everything depends on the customer's requirements.Many a times it is seen that Gas/liquid is not 'sour' with partial pressure of H2S so low that NACE does not apply but still customer insists for NACE conformance.As I have indicated in my previous mail,if your customer permits you,you can carry out SSC test on a pipe as per TM0177 standard and conform Nace compliance through lab test reports including hardness.You can go one step further and get micro test done as per ASTM E-45 method D and confirm absence of 'elongated MnS inclusions'.If the mill confirms NACR compliance,you do not have to carry out any other tests unless your customer has asked you additional specific tests.
Regards
Aarpee
On Sat, Sep 25, 2010 at 6:03 PM, Sivashankar Nagamanickamsundaramoorthy <poovaishankar@yahoo.com> wrote:
Hi Mr.Aarpee,
Wheather SSC test is required for the Seamless pipes for the confirmation to the NACE requirements ?.
Regards
Siva
From: Ramprasad Chari <ramprasad.chari@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thu, September 23, 2010 1:48:58 PM
Subject: Re: [MW:7171] NACE MR0175
Conformance to NACE MR0175 certifies material to be used for 'sour' gas applications which implies that material is resistant to various cracking mechanisms assoiated with H2S presence in a wet gas/liquid.If the mill is pre-qualified carrying out tests as per TM0177 standard(for SSC) and TM0284(for HIC) then mill can certify conformance.Alternatively,if the client permits you can carry out the test per heat per size to confirm conformance to NACE MR0175.For seamless pipe HIC may not be required but for welded pipe,you may have to carry out HIC as well as SSC test.Hardness is one of the criterion of max 22HRC.If hardness is not achieved in 'as 'condition in weld and HAZ,you may have to carry out PWHT to ensure that hardness is below 22 HRC.
Regards
Aarpee
On Thu, Sep 23, 2010 at 10:53 AM, Moin - QC <Syed.Moin@gerabgroup.com> wrote:
Hi,
Can somebody please explain the difference between ‘’ Material According to NACE MR0175’’ & ‘’ Hardness according NACE MR0175’’
I am purchasing some material from mill, but they said that they can meet the hardness requirement only, but cannot write ‘’ Material accordance to NACE MR0175’’ on material test certificate.
Material is seamless and welded pipe.
Thanks & Regards
SM
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