Limesh,
Mr Pieper explained the requirements in details. Practice-C(Huey ) is considered to be the most severe amongst all IGC’s.
Urea equipments. e.g, Reactors, carbamate condensers, separators calls for huey teat for S.S base metals and welds.
Typical criteria (I’m referring to Snamprogetti Spec SP-CR-510):-
· Corrosion rate for all 5 periods shall be nearly equal
· Rate of corrosion between 4 thh and 5 th period of boiling (e.g. change from passive to transpassive state) should not be have major differences.
· Also the depth of attack shall be measured and recorded.
I do not remember the values on the top of my head but if you require more info, I may look for the same in my library.
The attached sandvik article puts some references on both 316L(Modified) and 310 modified(Sandvik 2RE69)for urea services.
Practice-E is the default IGC method for all S.S, a good and properly manufactured austenitic S.S is supposed to pass this test without any difficulty.
Thanks.
Pradip Goswami,P.Eng.
Welding & Metallurgical Engineer/Specialist
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of hpi001
Sent: Sunday, September 19, 2010 1:46 PM
To: Materials & Welding
Subject: [MW:7097] Re: Huey Test and IGC
Hello Limesh,
For Practice C : 5 x 48 hours means one sample which need to be tested for 5 periods of 48 hours. After every single period the test solution need to be refreshed and the samples weight need to be measured.
For Practice E: Acceptance criteria --> cracks present in the specimen after bending (visible with eye and/or microscopic) are not acceptable. Only small cracks started from the specimens corners may left outside the examination. By bending the specimen you can prove that grain boundaries are not affected due to corrosion.
Hope this clears everything a little bit more.
Best Regards,
Herman
On 19 sep, 06:21, limesh M <limes...@gmail.com> wrote:
> Dear Herman Sir,
>
> Thank you for the valuable information .I need some clarification on the
> following lines.
>
> "Practice C (Huey) = Standard 5 x 48 hours" , what is this 5? 5 pieces of
> test specimen or any other item?
>
> "Practice E (Strauss) = Standard is 15 hours - Boiling Acidified Copper
> Sulfate Test Solution (if required also 48 or 72 hours can be used),
> acceptance criteria are cracks in the specimen after three point bend
> test."
>
> Acceptance criteria are cracks or no cracks?If answer is cracks,then what is
> the logic behind that?
>
> Please clear my dobts.
>
> Regards,
>
> Limesh
>
>
>
> On Sun, Sep 19, 2010 at 3:18 AM, hpi001 <pieper-...@kpnmail.nl> wrote:
> > Dear Limesh,
>
> > As already mentioned by Mr. Raghuram Bathula you have several tests
> > according to ASTM A262. All are related to inter-granular attack but
> > in different environments. Find below the solutions, test time and
> > acceptance criteria for your info. Be aware that for Practice B and C
> > the max. allowable corrosion rate should be specified by your client.
>
> > Practice B (Streicher) = 1 x 120 hours Boiling Ferric Sulfate-Sulfuric
> > Acid Test Solution, acceptance criteria is corrosion rate in mm/month
> > Practice C (Huey) = Standard 5 x 48 hours - Boiling Nitric Acid Test
> > Solution (sometimes also 1 x 48 hour + 1x 96 hour is used), acceptance
> > criteria is corrosion rate in mm / month
> > Practice E (Strauss) = Standard is 15 hours - Boiling Acidified Copper
> > Sulfate Test Solution (if required also 48 or 72 hours can be used),
> > acceptance criteria are cracks in the specimen after three point bend
> > test.
>
> > Best Regards,
>
> > Herman Pieper
>
> > On 18 sep, 12:32, limesh M <limes...@gmail.com> wrote:
> > > *Dear All,*
> > > **
> > > *What is Huey test ?*
> > > **
> > > *Huey test and intergranular corrosion test as per ASTM A262 are same or
> > not
> > > ?*
> > > **
> > > *How we are finding the Intergranular corrosion?*
> > > **
> > > *What is the acceptance criteria?*
>
> > > Regards,
>
> > > Limesh
>
> > --
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