Re: RE: [MW:7246] NACE MR0175

I think, you also have to take care that Nickel shall be less than 1%. CE shall not be more than 0.43%.

On Tue, 28 Sep 2010 01:12:39 +0530 wrote
>

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. Thereare specifications for a few seamless pipes also.

Coming back to your query: MaterialAccording to NACE MR0175''—Implies that all the requirementsof MR-0175 have been met by the manufacturer and the material is fit for sourservice. If one goes through in details, MR-0175 provides the guidelines ofwhat tests to be asked for sour services. See the sample below-ANNEX-E.

The second option specifiedby your manufacturer:- Hardness according NACE MR0175—does not make anyreal sense, this means they would conform to 22 HRC(248VHN) hardnessrequirements as required by the spec at the point of supply.

What's thespecification of Pipes to be purchased??. If it's covered in MR-0175thenthe supplier has to stick a manufacturing and Q.A program meeting NACE MR-0175.Ifit's newer materials, it requires qualification to MR-0175.

It would be good ifyou read the MR-0175 and specifically ask for the applicable clauses, for yourapplication, then it will put the mills on the hook.

Thanks.

Pradip Goswami,P.Eng.

Welding & MetallurgicalEngineer/Specialist

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

5 Purchasinginformation

5.1 Thepreparation of material purchasing specifications might require co-operationand exchange of data between the equipment user, the equipment supplier and thematerial manufacturer to ensure that the material purchased complies with NACEMR0175/ISO 15156-1 and this part of NACE MR0175/ISO 15156.

5.2 Thefollowing information shall be provided:

·preferred materialtypes and/or grades (if known);

·equipment type (if known);

·reference to thispart of NACE MR0175/ISO 15156;

·acceptable basesfor selection of materials for SSC resistance (see Clause 7);

·requirements forHIC resistance (see Clause 8).

5.3 Theequipment user and the equipment supplier/material manufacturer may agree thatcarbon or low alloy steels other than those described and/or listed in Annex Amay be selected subject to suitable qualification testing in accordance withAnnex B and NACE MR0175/ISO 15156-1. The qualification requirements may beextended to

include resistance to SOHIC and SZC.

If the purchaser intends to make useof such agreements, extensions and qualifications, the appropriate additionalinformation shall be clearly indicated in the materials purchasingspecification. This information may include

·requirements for SSC testing (see7.1, 7.2),

·service conditions for specific sourservice application, and

·other special requirements.

5.4 Annex Cdescribes how to calculate the H2S partial pressureand Annex D gives guidance on how to determine the pH-value of a fluid.

5.5 Theinformation required for material purchasing shall be entered on suitable datasheets. Suggestedformats are given in Annex E.

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From: materials-welding@googlegroups.com[mailto:materials-welding@googlegroups.com] OnBehalf Of Ramprasad Chari
>Sent: Monday, September 27, 201012:00 AM
>To:materials-welding@googlegroups.com
>Subject: Re: [MW:7209] NACE MR0175

If the mill supplying a seamless pipe is pre-qualified to supply NACEpipes,you need not carry out SSC test.Mill shall indicate NACE conformance ontheir TC including Hardness values.Everything depends on the customer'srequirements.Many a times it is seen that Gas/liquid is not 'sour' with partialpressure of H2S so low that NACE does not apply but still customerinsists for NACE conformance.As I have indicated in my previous mail,if yourcustomer permits you,you can carry out SSC test on a pipe as per TM0177standard and conform Nace compliance through lab test reports includinghardness.You can go one step further and get micro test done as per ASTM E-45method D and confirm absence of 'elongated MnS inclusions'.If the mill confirmsNACR compliance,you do not have to carry out any other tests unless yourcustomer 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 theconfirmationto the NACE requirements ?.

Regards

Siva

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From: Ramprasad Chari<ramprasad.chari@gmail.com>
>To: materials-welding@googlegroups.com
>Sent: Thu, September 23, 20101:48:58 PM
>Subject: Re: [MW:7171] NACE MR0175

Conformance to NACE MR0175 certifies material to be used for 'sour' gasapplications which implies that material is resistant to various crackingmechanisms assoiated with H2S presence in a wet gas/liquid.If the mill ispre-qualified carrying out tests as per TM0177 standard(for SSC) and TM0284(forHIC) then mill can certify conformance.Alternatively,if the client permits youcan carry out the test per heat per size to confirm conformance to NACEMR0175.For seamless pipe HIC may not be required but for welded pipe,you mayhave to carry out HIC as well as SSC test.Hardness is one of the criterion ofmax 22HRC.If hardness is not achieved in 'as 'condition in weld and HAZ,you mayhave 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 thedifference between '' Material According toNACE MR0175'' & ''Hardness according NACE MR0175''

I am purchasing some material from mill, butthey said that theycan meet the hardness requirement only,but cannot write ''Material accordance toNACE MR0175'' on material test certificate.

Material is seamless and welded pipe.

Thanks & Regards
>SM

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