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If the results of the fitness for service require a rerate or repair the vessel should be taken out of service immediately to make the repairs or a rerate should be performed. The point of the evaluation is to determine if the vessel is fit for continued service. Failing to do so would be the...

You need to have a fitness for service evaluation performed using API 579 and have the vessel rerated to continue service.

The spacer ring will have little to no effect on the carbon steel piping. Now, if it was the other way around and the piping was stainless and the spacer was carbon steel it would be affected more.

A long screwdriver.... The corrosion products have very little strength so just scrape them off then do some UT. This is not good advice. Do not do this unless the system is very low pressure and the process contained is not dangerous. Believe it or not, a little bit of scale can block a...

It's a simple repair. As Christine74 mentioned above an R stamp is not required unless it's needed for the owner user or your jurisdictional. If not then you can do a 510 routine repair but an API 510 has to be involved with the repair planning and the final acceptance. At a minimum, the...

You could use the PIP Process Industry Practices. I believe the one for 650 Storage tanks is VESTA002, VEETA001, and VEDTA003

A device for heating the tanks or a device for offloading them?

That's an interesting article. I have read theories and reports on PTFE fasteners being prone to self-loosening due to the nuts being oversized to make up the difference for the coating thickness. At my site, we only use PTFE-coated fasteners and are a batch-production therefore the...

Consider looking into PTFE-coated fasteners.

API 510 section 6.5.1.4 answers your question. 6.5.1.4 For pressure vessels in noncontinuous service, the interval is based on the number of years of actual service (vessel in operation) instead of calendar years, provided that when idled, the vessel is: a) [highlight #FCE94F]isolated from the...

I have a 10ft Diameter sloped bottom Carbon Steel API 620 storage tank that rests on an elevated concrete foundation with leak detection grooves that was constructed in 1991. Between the tank bottom and the concrete foundation is a 1/2" Asphalt Impregnated board. Over time the Asphalt board has...

9.11.1.3 "The use of welded-on patch plates that do not meet the requirements of 9.11.1.1 or 9.11.1.2 is permitted if the repair method has been reviewed and approved by an engineer experienced in storage tank design in accordance with API 650". This can be done if your thickness is less than...

Take a look at API 653 Figure 9.13. This will answer your questions.

You can add the 2" nozzle as long as it meets the design requirements of the applicable construction code. This will fall under a 510 repair and will not require an R-Stamp UNLESS your company or jurisdiction requires it to be. Even if an R-Stamp is not required the company doing the work must...

API 574 Table 7 shows an example of alert thicknesses for carbon and low-alloy steel pipe that could be used in conjunction with the default minimum structural thicknesses.

The Valve is currently in service, removing the bonnet wouldn't be idea. The valve and piping system is owned by another company that sends process vents to our incinerator.

It does not unscrew. I've never seen anything like it before. I may have it X-rayed to see the internals while it's still in service.

Added more images to the post. The P&ID has no labeling, but the symbol indicates a flame arrestor. No other connections. It has a hand drawn flow arrow indicating the flow direction on top.

Can I get some help from the experts on identifying what type of valve this is? My initial thoughts were a Globe Check valve. The identification tag is long gone. Thanks!

The welder must qualify on the pipe diameter, thickness, position, etc. listed in the tables below that cover the welds he will be making. It's best to select the test specimen that matches the full range of the WPS. Even if he is only qualified to weld pipe down to a diameter of 1" and the WPS...