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All good information. We inherited the system from another company and have no idea why they put an atmospheric vac vent on a butane storage sphere anyway. We intend to connect it (if its needed) to another source of "vapor". Hadn't thought about the vapor pressure angle. I was thinking more...

Two ways to handle this. 1. degas the sulfur before loading. 2. use a vent hood with a vacuum eductor to handle any offgas from the truck. We use the latter method. All gas/vapor is routed to an incinerator. We have small port in the hood that may be used to check liquid levels in the truck.

I have been asked to check the need for a vacuum vent valve on a pressurized liquid storage sphere. The sphere was designed for pressure and not full vacuum (but it will withstand a partial vac). The question is - does it need to be designed for full vac? I know the sphere diameter, metal...

Ok, I think I'm with you. More background - our lab is providing ppmw S in gasoline (or diesel for that matter) and a process analyzer is giving it as ppmv. We are trying to reconcile the two values

There is some disagreement in the office on how to convert ppmw to ppmv for a liquid system. The majority favors the following formula: ppmv = ppmw * spgr (of the solution)