On 12/15/24 10:31, Max Nikulin wrote:
I think you may have miss-spelled the adjective describing how hot. In this case the cardox was about 100 feet away so there was lots of pipe to absorb and radiate the heat of compression. The motor that ran it was something in the 250 horse category, running on 440 3 phase. Breaker was in the bunkhouse, sounded like a 10 ga shotgun. First time I'd seen a GE AK-225 but I've seen and rebuilt several since. in my BC engineering, most UHF transmitters in the 70's used a bit over 275 KWH to generate 30 KW of power to the antenna. None of those left, we have better, cheaper, and more efficient power amplifiers now.On 15/12/2024 03:24, gene heskett wrote:On 12/14/24 12:31, Thomas Schmitt wrote:Gene Heskett wrote:Our std night shift procedure was to pump the big tank down to under 2 or 3psi, which put the bottles up around 7400 to 7800 psi at midnight. Themorning shift at 8AM had 5200 psi to play with till the truck got there.Around a 2500 diff. Where did the rest of it go?The pressure of a given amount of gas in a given volume is proportional to its absolute temperature. Pressure reduction from 7400 to 5200 would correspond to a temperature reduction from e.g. 427 Kelvin (309 F, more than boiling hot but not glowing) to 300 Kelvin (80 F, luke warm).The next step would be calculation of ideal gas temperature in a vessel after filling it from atmospheric pressure to 7500 psi (rather high value) neglecting heat dissipation through the vessel walls.(Side not: compressor thrust may be hot as well) +100 K difference does not look like an overestimate from my point of view.
I've BTDT, have you?Heating during filling was mentioned previous time as well and sounds reasonable..
Cheers, Gene Heskett, CET. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis