The key is to limit this transitional time between the 'lean' and 'rich' atmospheres so you don't stay in the explosive range. Standard floating roof storage tank RAGAGEP though does not typically take any special precautions into account (when designed and operated to API650, API 2510, NFPA...
Sounds like you want a butterfly valve (squeeze between flanges...if there is room to spread them). I know of no ball valve insert that is similar to how check valves have the 'insert' or 'wafer' style.
I do it both ways depending on the job and contract/contractor. Best to put the test/hydro, stress relieve and such on the ISO, but sometimes, it's all similar fluid and unnecessary...such on asphalt lines in the tankfarm.
It's just an old double ported globe valve best I can tell...I assume there is a reason to throttle the flow there? Sure is a big clamp downstream on a previous corroded / eroded area so something is going on there...seems like maybe the entire section should be replaced. Anyway, if needing a...
Goulds has mag drives also so it isn't a mag vs Goulds thing really. Even if going mag, I'd still give Goulds a shot at it. A min flow spill back can help with that run dry concern. Only real drawback to your application, besides the initial outlay, would be the efficiency losses so maybe run...
Three images from a similar install for asphalt. We use a heavy weight such as a W beam or section of railroad steel to hold the floor deflection down till the steady bearing is installed if needed. The product will hold it down in service and when the mixer is running. Note that the roof...
You're at 8+ FT/S in that 1" pipe. I'd argue you want to be 1 to 2 FT/S at most...enough to have turbulent flow and push air out but with as much residence time as possible to allow heat exchange. If circuits are closed off, you'll push velocities even higher of course. I've typically put a...
Not a tank designer, just a long time purchaser / project manager of installations. I have to assume their intention is to relieve trapped vapors. They of course want the sealed manway and a higher vent (versus just a cover) so product during an upset or fire fighting liquids can't get into...
I would recommend a expansion 'loop' versus the bellows. If it has to be a bellows, don't skimp and make sure it is robust and can take the pressures it could see under adverse conditions (especially where a PD pump can be reversed).
Thanks all. I'll agree with 'they made a mistake / omission' side of the argument. They clearly want handrails and deem a guardrail at 42" to be too high. Worst case, we spend just a little more money but at least they get the protection on a 'open both sides' as they would on the 'open one...
I work for a company that operates numerous bulk asphalt storage and paving grade production facilities. We've been using API RP 2023 (Guide for Safe Storage and Handling of Heated Petroleum...asphalt...) as a design guide...especially concerning pyrophoric iron sulfide deposit prevention...
I'm not familiar with how well it covers testing ,but I think you're going to want AWWA C901 or C906 for polyethylene pressure pipe. ...and for firewater, our insurer requires it be FM approved pipe and fittings.
