API is Recommended practice not a construction code or specification ... client requirement is contractually point in the quotation stage ... in any time contractor can ask engineering for concession and it is scope of engineering work
Best Regards ,
ENG. Ahmed Osman
On Wednesday, August 14, 2024 at 07:41:44 a.m. GMT+3, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:
Even some customer asking Impact for P91 material for oil & gas sector.
THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE, CSWIP 3.1,
ISO 9712 Level 2 in VT,
ASNT-Level II in PT,MT,RT & UT,
LA ISO 9001-2015,
International Welding Engineer.
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349
On Tue, Aug 13, 2024 at 11:05 AM Vishwas Keskar <vvkeskar123@gmail.com> wrote:
Dear Ahmed--TrueIt is creep resistant material.How ever some of specifications (Like API)impose Impact testing .Sent from my iPhoneOn 12 Aug 2024, at 12:30 PM, 'Ahmed Osman' via Materials & Welding <materials-welding@googlegroups.com> wrote:Dear ,- P22 is used for creep resistance ... why go for -29C temp. ... u can check with engineering department .- for your case try to modify joint design for minimizing the weld cross section as much as you could ... go for the lowest available SMAW electrode diameter , GTAW wire diameter .. try to use string passes and avoid waving technique .. temp. after PWHT to be controlled during cooling process- for hardness i see it is OK .. just Charpy is the point to concentrate- if results still not OK .. check with engineering to go fo 1% Ni electrode but it will be differ than base metal chem. composition Cr%Best Regards ,ENG. Ahmed Osman--On Saturday, August 10, 2024 at 07:25:38 p.m. GMT+3, Prathab P <prapoovins@gmail.com> wrote:Sir,PWHT690°C for 96minsImpact-29°C--On Fri, 9 Aug 2024, 13:01 Vishwas Keskar, <vvkeskar123@gmail.com> wrote:What are PWHT parameters ?--What is Impact temperature?Sent from my iPhoneOn 9 Aug 2024, at 11:42 AM, Prathab P <prapoovins@gmail.com> wrote:Dear Experts,--PQR Test CouponBase Plate: A387 Gr22 CL2 (P. No. 5A, Gr.1)Dimension: 500x350x40mmApplication: Heat ExchangerJoint Design: Double BevelGTAW: Er90SB3Size: 2.4mmSMAW: E9018-B3Size: 3.15 & 4.00mmPreheating: 160֯C minInterpass Temp: 200֯C maxDHT: 300֯C for 2hrsThe above mentioned test coupon impact and hardness testing failure. Impact value is getting lower and hardness value getting higher.The impact required average value is 55J and hardness max value is 225BHN but the impact actual value getting 22J and the hardness min actual value getting 208BHN.What is the exert problem for this failure?Please give us a deeper explanation for this failure. What is the solution?
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