We have two of the Mark's keg washers. Kegs are disassembled every time and stored pressurized with a bit of remaining sanitizer in them. Once they are disassembled, cleaned, sanitized, and pressurized they get a little tag that says "S+P" for sanitized and pressurized. All keg parts stay with that keg.
When I need one, I just pull one out of the "S+P" stack, pull the pin to see if it holds pressure well, dump out the remaining sanitizer, fill, and re-pressurize. If it has no pressure, I know something is off.
When we blow a keg, we rinse the line immediately with BLC or Penetrate and take the keg off. The dirty keg goes in the dirty pile, and then those are cleaned in batches as needed. Myles usually does 4-6 kegs at a time.