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Dear all, Now I am designing heat exchanger, the project owner wants to have tongue and groove gasket seating. We will use flat metal gasket. Could anyone have formula to specify the tongue and groove gasket seating width ??

Dear all, I have tube to tubesheet joint in our HE (tube and tubesheet is 304). Our WPS stated that the filler weld shall be 308. But now our welder made a mistake by using 309 filler weld. What should I do ??? I read from filler cataloque the different between 308 and 309 is carbon, chrome and...

Dear all, I have an Heat Exchanger made by 1.25 Cr - 0.5 Mo (SA 387). AS per ASME VIII PWHT for P4 min temp is 593 C. But Our project spec stated that PWHT temp min is 670 C. I also read from KOBE cataloque temp min PWHT is 670 C. My question what make these different value ? Is there any...

Dear all, I wonder why we require pre heat arround 150 C when we weld P4 (for example A-387). Is there any metallurgy reason for it ?

Dear all, I have heat exchanger that requires hydraulic tube expanding. My question is what the advantage of this method compare to the other ones (pneumatic and motorized system)? Thank a lot

Dear all, I have a heat exchanger with carbon steel tubesheet. There is stainless steel weld overlay on tubesheet. The tube is carbon steel. Tube to tubesheet joint is strength weld. My question is there any possibility for galvanic corrosion between CS tube with SS weld overlay ?? Thanks a lot

Dear all, Is SA 179 killed steel ? And if it is not, is there any possibilities to change it to killed steel ? thank a lot

Dear all, Could you please give me an advice. I have u tube of A 213 T11 (1.25 Cr - 0.5 Mo). Do I need stress relieve for these tubes ? Is there any code regarding this matter ? Thanks a lot.

Dear all, I have austenitic U tubes (A-213 TP304L), after bending we carry out solution annealing. Does ASTM 262 mandatory to be done after solution annealing ? How about E 112 determining grain size, is it also mandatory ? regards,

Dear all, Has anybody hear about Larson Miller hardness parameter for Cr-Mo material. This is the guidance for PWHT in reducing hardness to void any crack.

Dear fellow, I have SA-213 TP304L U tube with boiler feed water service. I have indicated that these tubes shall be stress relieved with holding temp: 1050-1100 C, holding time : 10 - 20 second and rapid cooling. My questions are : 1. Is there any difference between water and compressed air...

Dear all, We have bought plate material to fabricate tank with carbamate solution service. Plate material is SA-240 Typ 304. Is it mandatory for mill supplier to do solution annealed ? As far as I know this requirement is clearly stated in ASTM and I do not see this test being done in mill...

Dear all, I Believe there is no requirement for tube expanding ratio in standards (ASME, TEMA and API 660). Could anyone help me regarding this ? Now I am designing heat exchanger with strength weld and light expand.

Dear all, I have carbon steel shell with 60 mm which is mandatory for PWHT. In other hand we also require stress relief because of extreme fiber elongation excedd 5% during forming. Can I include stress relief in PWHT for this shell ? In other word there is only one heat treatment. Looking...

Dear all, Does anyone know how to calculate the MAWP for girth flange type 3a in appendix 2 in ASME Sec VIII ? Looking forward for your information.

Hai all, Does anyone know why low chloride content gasket require for stainless steel girth flange ? Is there any reaction between Cl and Stainless steel ? Look forward for the information.