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Gents, I considered the continuous dray air flow, it sounds good. When it comes to desiccant, theoretically it is ok but practically not sure, vent cannot be sealed so continuous moisture coming form vent nozzle will collapse the desiccant capacity very soon. Also amount of desiccant for a...

EdStainless, Not to write an even longer first post I generalized some details. Out of 11: Seven are designed to store hydrocarbons at ambient temperature, these are provided with permanent open vents and bottom plates are internally coated. Two are designed to store hydrocarbons at high...

We have to keep in mind that we are not in operation or mothballing, we are still in construction phase and it will not take longer than one year to the tanks to enter into operation. Thin rust layer does not protect the tanks but penetration rate will not be more than 5 mpy, corrosion...

Dear EdStainless, I already consulted VCI suppliers; we commonly use them in different formats for pressure vessels, packages, and many other equipments. The problem with our tanks is that due to the volume and metal surface of the tanks, it is nearly unaffordable. If something is required, it...

Dears, I would appreciate your advice on following matter… We are constructing some API 650 storage tanks close to seaside. These tanks are designed to store hydrocarbons once in operation so are not internally coated and are made of CS. There are 11 of them in different sizes from 11m diameter...

I cannot explain. From my point of view It does not make any sense neither. I have never seen it and I do not see any reasons to use it. But client asked if possible and I did not find any reason not to use it except because it is useless. Useless but not harmful.My answer will be: yes you can...

Dear Sirs, Has anybody seen a low pressure tank (API620, DP=0.6barg) with internal floating roof? Does it make any sense? If yes, please explain the sense of this configuration. How do you keep the pressure balanced between above and below floating roof? Thanks in advance

Hello, Nice, but this modified platform will create different loads that should be checked on the vessel wall, right? Additionally, I will also use lifting lugs to weld some bracings. I can make the calculations, but vendor is giving a waranty for the equipment bassed on their calcs and they do...

I have a U-stamped pressure vessel on field with wrong platform clips. There is also a repad inbetween vessel and clip. The thing is that clips and platform mismatch and I can solve the problem cutting the top of the clips and doing minor modifications on the platform to acomodate it to current...

Yes, it is an API650 tank. 7.3.6.1 Leads us to 7.2.1.1 where allow welding of “Non-structural small attachments”. Is a lifting trunnion a “Non-structural small attachments”? During service, this will not be anything but an ornament.

Hello, I am getting a bit confused now, I am more into pressure vessels world and some lost in API650 world. As far as I knew, there will not be any API-650 inspector, I mean, there is not any inspector from API similar to the one from ASME to stamp the vessel. The only inspectors would be our...

Sorry, I forgot to mention something. Of course, we can weld if we rehydrotest the tank. This is what we are trying to skip, a second hydrotest. regards,

Hello everybody, I am facing a unexpected problem and do not know how to solve it in a quick and economical way. I work for an EPC company and one of our tanks vendors has designed and fabricated a 4.3m diameter and 8m high SS shop fabricated tank. The problem comes because they assumed that...

IFRs. I am sure nothing makes this one special, this is why i ask here, to get some guides from your (all of you) expertise. Any suggestion about how to calculate the lenght of weld? Thanks,

IFRs: That was my second thought, but the weak seam do not depends only on the weld, it depends on the weld (no more than 6mm leg) the participating part of the shell, the participating part of the roof and the top angle. The problem is that for small tanks (as a general rule) the addition of...

DavidCR: No, the tank stores water, it is not designed to store propylene or any other gas. The tank is designed according to API650 to store water. The issue with the propylene will come only in case of failure at one heat exchanger far from the tank. But in case of this failure the propylene...

Hello, I have reviewed ANSI/API standard 2000 "Venting Atmospheric and Low-pressure Storage Tanks". I followed the rules for emergency (fire outside of the tank but not into the tank) and operating venting (basically due to the liquid flow), but this standard is not applicable for deflagration...

It is a API 650 storage tank

Hello, I have a 6500 mm ID and 7500 mm height atmospheric tank. The tank stores water but there is a choice of having propylene into it (if something is broken somewere else). So that it has to be designed to withstand propylene deflagration. The problem comes when I go through NFPA 68 and the...