"Nominal Inter-stage pressure."
Gospel; or is there wiggle room? Is it described in manuals as "nominal" just from a mathematical point of view; or is it simply adjectival or both, referring to the lowest tolerable number for function, and allowing for some variance?
Some manufactures call for a single number and testing at two extreme -- high and low -- tank pressures; while others chart an acceptable range, usually within about 10 bar, at one. Considering most analogue IP gauges, even those routinely used in shops, call for a bit of guesswork, how many of the techs and DIYers, out there, play a bit with the numbers? What would many consider a safe margin of error?
A friend, who is just beginning to work on her own gear, is currently obsessed with two high-quality IP gauges, both of which show tiny variances among them; and almost did a spit take when I gave her a digital one, for Christmas. When I suggested that she simply guess, at that tiniest hashmark between 8.5 and 9 bar, on the older gauges, she looked at me as though I had a bout of crazy eye.
How would you all allay her fears --- aside from the fact that I am still breathing, after futzing with the stuff, for years?
Gospel; or is there wiggle room? Is it described in manuals as "nominal" just from a mathematical point of view; or is it simply adjectival or both, referring to the lowest tolerable number for function, and allowing for some variance?
Some manufactures call for a single number and testing at two extreme -- high and low -- tank pressures; while others chart an acceptable range, usually within about 10 bar, at one. Considering most analogue IP gauges, even those routinely used in shops, call for a bit of guesswork, how many of the techs and DIYers, out there, play a bit with the numbers? What would many consider a safe margin of error?
A friend, who is just beginning to work on her own gear, is currently obsessed with two high-quality IP gauges, both of which show tiny variances among them; and almost did a spit take when I gave her a digital one, for Christmas. When I suggested that she simply guess, at that tiniest hashmark between 8.5 and 9 bar, on the older gauges, she looked at me as though I had a bout of crazy eye.
How would you all allay her fears --- aside from the fact that I am still breathing, after futzing with the stuff, for years?