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Thanks everybody. It does seem like the whole assembly needs to be PWHT, shell, repad, and nozzles. They try not to use thickened inserts out here but in this case I don't think there is a way aound it since it will be a low-type repad and we have to deal with the corner weld.

JStephen, I understand about the application of API in the event of new construction. That seems very clear. If you read the section though, it states that "...all opening connections NPS 12 or larger in nominal diameter in a shell plate or thickened insert plate more than 25 mm (1 in.)...

Per API 650 section 5.7.4.2 and 5.7.4.3, certain shell nozzle penetrations require PWHT depending on material group, shell thickness, and nozzle size. When that is the case, "openings...shall be prefabricated into the shell plate or thickened insert plate and the prefabricated assembly shall be...

This is actually a 92'D x 40'H tank. The exterior is insulated but the area under the tank is not insulated with anything but the backfill materials. This tank is a basically a wide spot in the line with a constant in and out flow that regulates the temperature. There is an internal fired...

Agreed. On our site, they have blinded all rim seal vents as they were only used for the foam log type seals that they no longer use. The only case where gas build up would be a possibility would be with something like oil spiked with methane. Hopefully this would be degassed before entering...

MJCronin, I know what a leak detection system is and looks like. Thank you though. Duwe6, thanks for the info. I’m a mechanical and usually don’t get involve with CivE issues but I’m trying to help out my coworkers on this one. I thought that the vents might be just for a start up/reaching...

I guess I should've said that I understand how the vents work and the reasoning behind installing them, but what I was questioning is whether they are needed at all. We have a similar tank in sulfur service that's 150'D with 16 vents radially around the foundation. Each 4" pipe vent extends...

We're building a hot tank (380F design/300F op) in the place where a similar tank once was. The service is asphalt. Multiple hot tanks in our complex, from sulfur to asphalt, have pipe vents radially through the tank ringwall foundation. None of the Civil guys can tell me much about why they...

We're in the middle of getting bids on moving a 150' diameter storage tank. It's definitely pricey and we're only going about 100 feet. There are multiple options if you aren't going far: hydraulic lifting and then moving it on tracks, air bladders (like a hovercraft), and gantry cranes are...

Thanks for the help, guys. Gases aren't as intuitive as incompressible fluids (m_dot_in = m_dot_out). I am still going though API 2000 but it seems like the vent calcs and tables are more for fire cases. We are exploring the possibility of an orifice plate and relief vent on the inlet line...

Hello, I’ve got a question on over pressuring of a tank. I have a small (app. J, API 650) tank that requires a N2 blanket. According to the company standards, our regulators must fail open in order to keep the blanket. The design condition that I’m getting off of the old valve datasheets is...

Thanks for the direction, that gives me something to think about. To answer your questions on the column, it will support the rafters and thus the roof. Since the column is attached to the roof bracing, I foresee it experiencing little torsion. The slots are estimated to be 150mm x 1530mm...

My client wants me to repurpose an 40'H x 60'D API tank into a knock out drum and I am having trouble getting started on the slotted center column. The column is a 24" pipe (sched. TBD) with three sections of eight vertical slots to allow the gas escape up the column. I assume there would be...