I just got several of my vintage steel cylinders back from hydro, and they came back with some flash rust in them. I know that some flash rust is acceptable. Heck, these guys even hydro O2 and SCBA cylinders, so if flash rust were an issue........
Anyway, I knew the flash rust might throw my LDS guy into convulsions, so I whipped them and rinsed them. This did a fairly good job, but they still ended up with an orangish tint in areas from the rinse, so I'm running circles at this point....even though I know flash rust is no big deal.
So, I took them in to get the pretty stickers, and got a call back that there was rust in the tanks (no sh**) and they couldn't be "serviced" like that (translated: the inspector is incapable of finding significant pits unless the surface is bright and shiny).
Here's the thing. The hydro facility (you know, the one that does the fire department's SCBA and medical O2 cylinders) is mandated to visually inspect and pass the cylinder as part of their DOT recertification, so I know they are fine by DOT standards. When I go to reclaim my cylinders from the LDS I'm tempted to put them on the spot by saying something like, "Can I count on you guys as witnesses if I report the hydro shop for DOT49CFR violations for recertifying cylinders with flash rust in them?"
Anyway, I knew the flash rust might throw my LDS guy into convulsions, so I whipped them and rinsed them. This did a fairly good job, but they still ended up with an orangish tint in areas from the rinse, so I'm running circles at this point....even though I know flash rust is no big deal.
So, I took them in to get the pretty stickers, and got a call back that there was rust in the tanks (no sh**) and they couldn't be "serviced" like that (translated: the inspector is incapable of finding significant pits unless the surface is bright and shiny).
Here's the thing. The hydro facility (you know, the one that does the fire department's SCBA and medical O2 cylinders) is mandated to visually inspect and pass the cylinder as part of their DOT recertification, so I know they are fine by DOT standards. When I go to reclaim my cylinders from the LDS I'm tempted to put them on the spot by saying something like, "Can I count on you guys as witnesses if I report the hydro shop for DOT49CFR violations for recertifying cylinders with flash rust in them?"