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Sorry.. i have updated my first post with correct paragraph in current edition of API 650.

Hello everyone. According to API 650 paragraph 7.3.7.9 it is necessary to make some internal measurements in the tank before and after the hydrotest. What I understand is that with these measurements we could estimate some internal settlement at the bottom of the tank... but is there any...

tank Diameter of 38 meters.. It is not my intent to calculate dilation but to check if all points in tank dilates correctly.

@IFRs.. No.. I meant to check externally and control the tank (no internally).

Hello guys. I am not sure where should I include this topic but currently I have a tank that I wish to measure in an automatic way its expansion (it will be heated to 300°C) and wanna know if circunferentially all points dilate in good way.. does anyone know if there are ny equipement or device...

GD2.. No.. it was almost in the middle of tube length. with the shape of failure (this "fish mouth" shape) that a kind guy said before, it is not possible to determine a possible source? I was searching into literature and short overheating seems like it had happened.

Well.. the tube broken was found in almost the middle of exchanger. Broken part was in straight side (not curve part). "U" tubes were COLD BEND (was indicated in mill test certificate). In a note (of mill test certificate) it is indicated that all U tubes are solution annealing at the U bend...

Tube material Material: SS 347H. Diameter: 25.44 mm. Thickness: 2.032 mm. Pressure (shell side):25 BAR. Tube side: 155 BAR. Temperature (shell side): 565 °C. Tube side: 370 °C. Fabricated under ASME VIII DIV.2

Dear guys. Does anyone have experience in tube failure in heat exchangers type "U"? Actually we have had a failure in a heat exchanger and we foudn that 1 tube was broken. We are recovering all data from previous to event, however I dont lnow if you guys could recognize the failure with...

EdStainless If I remember well , austenitic SS has higher creep properties over ferritic SS, so I think this could be a reason why 347SS could be used. http://www.pms-c.com/wp-content/uploads/2012/04/Atlas_Technical_Handbook_rev_July_20101.pdf

TugboatEng Molten salts are typically made up of 60% sodium nitrate and 40% potassium nitrate. Working temperatuve range about 350-560 °C.

Hey guys. Does anyone is familiar with 347H Stainless Steel? I have read that this material is highly recommended to work in solar industry (high temperature and working with molten salts). Actually I wish to know why this 347H is recommended instead of 347. Is there any literature that talks...

Dear guys. Is it possible to have an stainless steel (austenitic) with a carbon percentage of 0.20%? I have never seen such high content since I remember that less than 0,10% carbon content is normal.

sorry guys, I did not reply on time. I provide some info (some others are still on investigation or recovering). bottom plate material is ASTM A516 GRADE70. Construction of tank was built following API 650 recomendations. NDT was more rentringent. As far as I know, there are not code or...

Yes.. it storages molten salts.

Hey guys. In my workplace we have a storage tank that works around 350 °C. During an outage we drainaged the liquid and started to perform a inspecion (internal and external too removing the insulation). We have noted that the bottom plate (edge side) has been deformed as shows in pictures...

MJCronin. Yes.. service is molten salts. and API650 is the only code that these tanks follow-up up to now.

Dear guys. I know it is a crazy question, but what could happens with a P91 pipe and welds on steam service what is working under pressure and without PWHT? Even if it is a temporal pipe (and probably it can be used for a couple of weeks on use) are there any "method" to follow to assure that...

Yes Bala. It sounds great. How could i get more info about this technique? do you know any company what execute this test?

Hey guys. Hope everybody is fine. Do you know is there are any method, technique or other test that could be carried out to check bottom plates of a storage tank (it contains molten salts at 500°C)? We wish to know bottom plates integrity. We can access to bottom plate external (as it can be...