Re: transportation environmental condition
In a message dated 98-03-09 15:13:04 EST, dmck...@paragon-networks.com writes: Ok, this is rather old but the atmosphere is still pretty much the same. Assuming your standing at sea level with 1 atmosphere pressure and +15C temp and you start to rise in altitude, you'll have roughly dependent upon alot of other factors ... AltitudeTemperature Pressure Approx Ratio of (feet) F Clb/ft^2 Altitude to sea level 0 + 59+ 15 2.12 x 10^3 0 20,000 - 12- 24 9.73 x 10^2 1/2 40,000 - 70- 57 3.93 x 10^2 1/5 60,000 - 70- 57 1.51 x 10^2 1/10 80,000 - 70- 57 5.81 x 10 1/50 100,000 - 41- 41 2.31 x 10 1/100 Assuming that you won't be shipping anything in an unpressurized cabin much above 60,000 ft, then testing for temp = -70C, pressure = (14.7 lb/sq.in.)/10 = 1.47 lb/sq.in. should do it. Speaking of humidity at temperatures near or below freezing doesn't really mean anything. -- From: regr...@esaote.com To: emc-p...@majordomo.ieee.org Subject: transportation environmental condition Date: Monday, March 09, 1998 8:43 AM Hello all! Does anybody know the foreseeable environmental condition (temperature, humidity, pressure) you have during transportation of a device on a plane? Of course they depend on flight heigth, but is it possible to get rough, common-sense data for the design of packaging? Many thanks Massimo --- ESAOTE S.p.A. Massimo Polignano Research Product Development Regulatory Affairs Via di Caciolle,15 tel:+39.55.4229402 I- 50127 Florencefax:+39.55.4223305 e-mail: regr...@esaote.com If you're speaking of CARGO compartment conditions, I believe that those are pressurized and heated to about 50 degrees F on passenger planes (otherwise, I suspect, passengers would get upset about their freeze-dried pets and luggage). Does anyone know of any standard conditions for cargo compartments? Mike Sherman FSI International msher...@fsi-intl.com [miksher...@aol.com]
RE: transportation environmental condition
Massimo I'm assuming that you are referring to equipment installed on an aircraft as opposed to used or carried on the aircraft. I have been using an Aeronautical Specification for Environmental compliance. Its called RTCA/DO-160C (actually there is now a D release as well) This address vibration, altitude, temperature, immunity, emissions and all airborne environmental concerns. Let me know if I can be of any help. Rick Busche Evans Sutherland rbus...@es.com -Original Message- From: regr...@esaote.com [SMTP:regr...@esaote.com] Sent: Monday, March 09, 1998 6:43 AM To: emc-p...@majordomo.ieee.org Subject:transportation environmental condition Hello all! Does anybody know the foreseeable environmental condition (temperature, humidity, pressure) you have during transportation of a device on a plane? Of course they depend on flight heigth, but is it possible to get rough, common-sense data for the design of packaging? Many thanks Massimo --- ESAOTE S.p.A. Massimo Polignano Research Product Development Regulatory Affairs Via di Caciolle,15 tel:+39.55.4229402 I- 50127 Florencefax:+39.55.4223305 e-mail: regr...@esaote.com
Re: transportation environmental condition
Ok, this is rather old but the atmosphere is still pretty much the same. Assuming your standing at sea level with 1 atmosphere pressure and +15C temp and you start to rise in altitude, you'll have roughly dependent upon alot of other factors ... AltitudeTemperature Pressure Approx Ratio of (feet) F Clb/ft^2 Altitude to sea level 0 + 59+ 15 2.12 x 10^3 0 20,000 - 12- 24 9.73 x 10^2 1/2 40,000 - 70- 57 3.93 x 10^2 1/5 60,000 - 70- 57 1.51 x 10^2 1/10 80,000 - 70- 57 5.81 x 10 1/50 100,000 - 41- 41 2.31 x 10 1/100 Assuming that you won't be shipping anything in an unpressurized cabin much above 60,000 ft, then testing for temp = -70C, pressure = (14.7 lb/sq.in.)/10 = 1.47 lb/sq.in. should do it. Speaking of humidity at temperatures near or below freezing doesn't really mean anything. -- From: regr...@esaote.com To: emc-p...@majordomo.ieee.org Subject: transportation environmental condition Date: Monday, March 09, 1998 8:43 AM Hello all! Does anybody know the foreseeable environmental condition (temperature, humidity, pressure) you have during transportation of a device on a plane? Of course they depend on flight heigth, but is it possible to get rough, common-sense data for the design of packaging? Many thanks Massimo --- ESAOTE S.p.A. Massimo Polignano Research Product Development Regulatory Affairs Via di Caciolle,15 tel:+39.55.4229402 I- 50127 Florencefax:+39.55.4223305 e-mail: regr...@esaote.com
