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  • Users: Ratheesh_n
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  1. Ratheesh_n

    stress reliving on 3mm 625 plate butt weld during PQR qualification for utilising in cladded vessel

    Team, PQR:- 4mm butt weld MOC: SB 443 UNS 6625 Service : Sour Design Code : ASME sec VIII Div 1 Vessel MOC :- 516 gr 70 with UNS6625 clad Method of cladding:- Explosion bonding We have received a WPS from our vendor and it's for 4mm 625 plate butt weld. However vendor has performed...
  2. Ratheesh_n

    Stellite 6 over Alloy 625 weld overlay

    Members, We have a case of valve disc material F44 and its weld overlaid with alloy 625(NICrMo3) and followed by weld overlaid with Stellite 6. 1. Is it a recommended method to follow and what must be the reason for doing the corrosion resistance overlay before hard facing. 2. What is the...
  3. Ratheesh_n

    Hard face over alloy 625 weld overlay

    Members, We have a case of valve disc material F44 and its weld overlaid with alloy 625(NICrMo3) and followed by weld overlaid with Stellite 6. Is it a recommended method to follow and what must be the reason for doing the corrosion resistance overlay before hard facing.
  4. Ratheesh_n

    Corrosion test for UNS 31254 in fittings vs forged flanges.

    Members, One of client specification mentioned corrosion test G48 method A with duration of 24 hours for forged flanges for UNS 31254 material. But for same UNS 31254 fittings(formed from pipe or plate) G48 method A with duration of 48 hours. Please tell why there is a difference in the...
  5. Ratheesh_n

    Power failure during PWHT

    Dear Team, Power failure happened during heating cycle of PWHT of APL 5L X65 welds ( piping as per B31.3).understand there is no issue in re-doing the PWHT as the crystal transformation temperature is not reached. 1). Does this interruption will have any impact on metallurgy ? 2). What is...
  6. Ratheesh_n

    Zirconia Grinder imapct on chemical composition of material

    Dear Team, We have to PMI of Inconel forged material (ASTM B564) with spectro. After the PMI the burn damage due to PMI need to be removed by Grinding. So vendor has proposed grinding with Zirconia grinder in order to avoid the change in chemical composition of material Surface. So please...
  7. Ratheesh_n

    Impact of using SS wire brush over the Inconel welds - any chances of rust spots generation ?

    Dear team, As we know use of CS wire brush over SS and inconel welds are not preferable as it will lead to contamination and rust spots generation. Similarly what will the impact of using ss wire brush over Inconel welds ? Weld :- Inconel 625 Regards, Ratheesh N
  8. Ratheesh_n

    Heat treatment requirement of F468 grade 625 after manufacturing by rolling

    Dear Team, F468 grade 625 manufactured by rolling operation and heat treatment (annealing) done on the bar prior to manufacture of studs. No annealing done after the rolling operation is completed. Is it acceptable Regards, Ratheesh
  9. Ratheesh_n

    simulated heat treatment requirement for API 5L X65QS/X65QO SAW pipes for nace service

    Dear All, We have received input from manufacturer that the SAW pipe test coupons are doing simulated PWHT prior to MPQT as per API 5L.Please let us know why this simulated PWHT is doing for test coupon and whether this is required as per standard Regards, Ratheesh N +918451991305
  10. Ratheesh_n

    Difference between ANSI FCI 70-2 & 70-3

    HI, can anyone please provide ANSI FCI 70-3 standard or explain what is difffernce between these two standards Thanks, Ratheesh N
  11. Ratheesh_n

    PR2 test requirement with respect to operating cycles -- API 6A

    Dear All, Please let us know what is the meaning of operating cycle mentioned in API 6A.table 57 refer PR2 for 200 operating cycle.what is the meaning fir this .. please help
  12. Ratheesh_n

    CE value in overlay

    Hi, We are doing overlay by inconel 625 on API 5L Gr X65 .CE value as per WPS is a limiting value for production or can we use same material grade and thickness with higher CE value ?
  13. Ratheesh_n

    Selection of corrossion test G28/G48

    Dear All, We are having injection quill fittings.Material grade is inconel 625. As we are referring the flange specification(SAMSS- Saudi Aramco standard),its having requirement of corrosion test G28. But for the same grade material (inconel 625) fittings is having requirement of corrosion...
  14. Ratheesh_n

    Modified ASTM 182 F22 materials

    Dear All, We are procuring a valve. The material used is ASTM 182 F22. The material is having higher tensile strength , yield strength and hardness than normal F 22 materials. So is it acceptable? And test certificate of this material will be certified as ASTM 182 F 22 ..will mention as...
  15. Ratheesh_n

    Requirement of pressure/temparature recorders at the time of pressure test as per B31.8

    Dear All, Is there any mandatory requirement of using pressure/ temperature records at the time of hydro test ..?
  16. Ratheesh_n

    PWHT for SA 403 welded fittings

    Dear All, We are procuring welded SA 403 fittings,During the review of WPS we found that PWHT (meniotned solution annealing as PWHT)is considered in WPS. As per SA 403 and Sec VIII div 1 , P8 material not required heat treatment ,unless design calculation say so.In our case there is no design...
  17. Ratheesh_n

    Weld deposit thickness in AWS D1.1

    Dear All, We have qualified a two welder in a single specimen(GTAW+SMAW).Qualification thickness will be based on the deposited weld metal thickness or as per the specimen thickness ? Ie out of 18 mm thk , GTAW - 4mm and SMAW 14 mm . So the GTAW welder qualified for unlimited thickness or...
  18. Ratheesh_n

    function of holes in choke valves body

    Dear All, There is 4 holes in choke valve body area which is in closed condition.Can anyone tell what is the function of these holes and why it is required. Regards, RATHEESH N http://files.engineering.com/getfile.aspx?folder=59dd765d-5b79-4bcc-8bcb-34e6d0201f48&file=20180319_134633.pdf
  19. Ratheesh_n

    Is it required to qualify separate WPS for repair welding as per AWS D1.1 ?

    We do have a approved WPS and PQR and we are doing a repair welding without change of essential variables. Did we need to qualify a new wps separately for repair welding as per AWS D1.1 ? As per AWS D1.1 , for Welded Restoration of Base Metal with Mislocated Holes. "One reduced section tension...
  20. Ratheesh_n

    Heat treatment after machining in Nimonic 80A

    Dear all, We need to do machining of Nimonic 80-A.and after that we need to do heat treatment for increasing the hardness . So doing this what are the point we need to take care And will there anyb change the %of elements like Nikal and chromium in the metal after heat treatment ? Please help

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