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  1. sayee1

    AC vs DC for demagnetising

    During welding of cs pipelines (API 5L X 52-65 grades) especially the residual magnetism is the pipes (due to say induction heating during the coating) could cause problems during welding. Now traditionally, the equipment for demagnetising are AC equipment. I was told however that the welding...
  2. sayee1

    Material selection for 2" piggyback pieline carrying Corrosion inhibit

    Need advice on selection of material for the following 2" piggy back pileine carrying corrosion inhibitor as per details below: Chemical Composition: Aromatic Naptha: 50 – 70% (w/w) Composition Comments: A proprietary blend of amine derivatives and fatty acids in an aromatic solvent. Physical...
  3. sayee1

    PWHT for inconel 625 clad/overlaid piping components/valves in sour se

    1. PWHT is not a requirement for the clad/overlay itself. Hence for a clad component (with any cs thickness, for e.g. even 200 mm wall thickness and typical 3mm clad), with the part not going to be butt welded to any other part (for ease of understanding, say for e.g. a blind flange), there...
  4. sayee1

    PWHT for an inconel overlaid equipment-Section VIII Div 1

    1. PWHT is not a requirement for the clad/overlay itself. Hence for a clad component (with any cs thickness, for e.g. even 200 mm wall thickness and typical 3mm clad), with the part not going to be butt welded to any other part (for ease of understanding, say for e.g. a blind flange), there...
  5. sayee1

    Valves with inconel overlay for sour service as per API 6D

    1. PWHT is not a requirement for the clad/overlay itself. Hence for a clad component (with any cs thickness, for e.g. even 200 mm wall thickness and typical 3mm clad), with the part not going to be butt welded to any other part (for ease of understanding, say for e.g. a blind flange), there...
  6. sayee1

    Low impact testing values for A694 F60 forgings

    This is just a brainstorming for possible reasons for low values on A 694 F60 forging @ -40 Degrees C. 1. Testing variance and improper root radius for notch. 2. Temperature, holding time and methodology for Quenching & Tempering. 3. Chemistry ??? 4. The freedom of cross section of impact...
  7. sayee1

    MEng vs the standard 4 yr BS/BE/BTech

    I am currently in process of getting UK based registrations where I am being offered Incorporated Engineer in place of Chartered Engineer because I do not have a 4 year MEng degree. Now my question is first on the registration itself where it seems that IEng is more of a QC related while CEng is...
  8. sayee1

    More of a physics or is it electrical problem??

    Imagine I have a HT cable running from a power station to a distribution station. The moment I have a potential difference in the form of some volts, In this case it should be very high voltage and low current, the free electrons start flowing from the negative to the positive terminal. What...
  9. sayee1

    A 252 Grade 2 for piles??

    1. Any idea on why this material is used for piles, i.e. A252 Grade 2. from what I can see of the amterial it says low carbon steel but from the specs P0.05 and rest Fe. I am confused on whether this is nearly pure Iron or steel. 2. In some technical write up I saw, since this material is not...
  10. sayee1

    Duplex vs aust vs Inconel alloys in H2S

    "We would suggest the following tentative ranking, which intuitively seems correct, as it puts materials with fully austenitic (fcc) microstructure ahead of those with partially or fully ferritic/martensitic (bcc) structure, in terms of resistance to cracking in H2S media: Incoloy 825> 316...
  11. sayee1

    CQE CQA CQM

    How useful are these certifications by ASQ? Especially since my core competency is welding and I am working on getting a MSc(welding) from Cranfield(eventually going to get EWE/IWE), MWeldI & CEng from TWI. I have got Sr Welding Inspector from CSWIP, and aiming to get CWI/SCWI from AWS. I would...
  12. sayee1

    Code interpretation

    Scope: 1. AWS D1.1: 2000 Table 4.5 addresses the PQR essential variable changes requiring WPS re-qualification for SMAW, SAW, GMAW, FCAW, & GTAW. Clause 4.7.1 states that changes beyond the limitations of PQR essential variables shown in Table 4.5 shall require re-qualification of the WPS. 2...
  13. sayee1

    PWHT for HIC/SSCC applications

    We are currently working with some client specs which requires PWHT for all thicknesses of cs for HIC/SSCC requirements. Now the only exempt welds are socket welds of 2" dia or lower. 1. Is this requirement ok based on your experience? 2. If I want to avoid PWHt for lower thicknesses, say...
  14. sayee1

    Lower impact temperatures for higher thickness of Base material

    I have come across quite a number of specifications which specify a lower impact temperature for the materials as the thickness increases. For eg for an offshore comp-lex using S355 grade of material upto 45mm, the testing of the material and welds is required @-20 Deg C (The complex is...
  15. sayee1

    Tensile strength for duplex (2209) type weld metal@120 Deg C

    Does anyone have data on Tensile strength of duplex weld metal at 120 Degrees C? Thks in advance Thanks and regards Sayee Prasad R Ph: 0097143968906 Mob: 00971507682668 email: sayee_prasad@yahoo.com The whole of science is nothing more than a refinement of everyday thinking!!! [thumbsup]
  16. sayee1

    Validation v/s Verification as per ISO 9001-2000

    Let us take an example of a process for ease of understanding say a software program for certification of QC activities. What should one interpret as the validation requirements v/s the verification requirements of the software? From my ISO 9001-1994 experience, with a "U" stamp as...
  17. sayee1

    Effect of Ca on weldability of pipeline steels

    1. How and why is Ca added(if at all added purposely) to line pipe steels? 2. DnV 2000 restricts the Ca content to 0.6%. Does increasing the Ca content affect weldability? If so how does it affect weldability? 3. Does increasing Ca in line pipe steels affect welding(especially automatic...
  18. sayee1

    Velocity of sound in Duplex and super duplex ss

    I need data on velocities of sound in DSS(S31803) and SDSS(S32750) for calculations related to Ultrasonic testing. Does anyone have refernces/data on the same??? Thanks and regards Sayee Prasad R Ph: 0097143968906 Mob: 00971507682668 email: sayee_prasad@yahoo.com The whole of science is nothing...
  19. sayee1

    corrosion resisitance of Inconel and some related queries

    The theories of Cr oxides giving the stainless steel is ok. Is the corrosion resistance of inconels also due to the same reasons? Do these alloys also have a thin Cr oxide layer giving the corrosion resistance? And if that is the case why do we not see any sensitization problems with Inconel...
  20. sayee1

    Corrosion of galvanised steel nuts and bolts in Al Bronze casting

    The subject materials(SA193 B7bolts, B148C95800 Al Bronze casting) intended for valve for seawater service. The galvanised nuts are not coming into contact with the seawater(They are on the side of the casting not in contact with sea water). In that case is any insulation required between the Al...

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