Recent content by roniprabowo

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 laphroaig, Now I am doing fertilizer plant project. I also use kammprofile gasket. What is your kammprofile brand ? Is it flexitalic. Now I am using kukil (Korea brand gasket). Yesterday we failed in bolting up our heat exchanger. We got some leakage in hydro test. May I know in what...

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

Sorry the fluid is pure liquid ammonia in tube side and steam in shell side. And about the joint type, there are expand only, heavy expand and seal weld and light expand with strength weld.

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 fellow, Now I am doing project with lamiflex longitudinal baffle. I use multiple layer with 5 ply sealing strips (each with 0.2 mm thick) with 460 F design temp, and the material 316 SS. I think multiple layer is better to keep elasity and sealing performance. I believe 316 SS is OK for 500...

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.

Maybe you can try www.mecaconsulting.com. There is a sample software (stackdes). This software is used by some famous company (zeeco etc). In my Last project I used this softwware.

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...