i want to paint a very common scenerio for you all and see if anyone thinks the epa is taking a reasonable approach.
you get a call for a glassdoor reach in icecream case. now the store people were slow to catch it and your tied up on a call its gonna take you say 2 hours to get there so walking in the door its been down 4 hours. you do your diagnostics and determine you have a clogged txv screen. you go to the rack and pump your system down, run your compessors a lil hard pull your sys to 0psig. now for the sake of argument we will assume our valves all hold good we valve off our system and now to be in accordance with the epa we must reclaim our sys down to 10" hg then we may pull the screen to check it. then after we replace the screen and having exposed our systen to the atmosphere while its under a vacumed condition we will now need to pull another vacume to remove the contaminates we just let into our system. so your looking at 8 hours or possibly more of down time over a dirty screen. now if you read the epa`s guidlines when it comes to verify a leak has been repaired they use the term " sound professional judgement" now i ask you is it sound professional judgement to pull an uncotaminated system into a vacumme so you can open it and intentionally expose it to moisture and other noncondesibles. also it is reasonable to expect a customer to be without refrigeration and lose product or sales because it had to be pulled or lost in order to be in compliance with the epa? in my sound professional judgement it is better to pull it to 0 psig so theoretically there is pressure on both the atmosphere and the sys and niether gas is leaked out nor atmosphere is let in and the task can be completed in a timely fashion.
anyone care to share thier oppion