Atmospheric Galvanized Steel Tank
Atmospheric Galvanized Steel Tank
(OP)
Team,
I have an Atmospheric Galvanized Steel Tank,
3/16" thickness and in good conditions, which I'd like to use, but I don't know the design temperature nor design pressure other than it's atmospheric. This tank has an internal heater system, but I don't know what steam pressure was used or designed for.
1)Could I use it for a design pressure of 302 degress F?
2)Being an atmospheric galvanized steel tank, can I install a rupture disc say 8 psig (has to be <15 psig for atmospheric)?
3) What "vacuum pressure" would this type of tank be designed for, ~ 10"WC??
Thanks,
JHernandez
I have an Atmospheric Galvanized Steel Tank,
3/16" thickness and in good conditions, which I'd like to use, but I don't know the design temperature nor design pressure other than it's atmospheric. This tank has an internal heater system, but I don't know what steam pressure was used or designed for.
1)Could I use it for a design pressure of 302 degress F?
2)Being an atmospheric galvanized steel tank, can I install a rupture disc say 8 psig (has to be <15 psig for atmospheric)?
3) What "vacuum pressure" would this type of tank be designed for, ~ 10"WC??
Thanks,
JHernandez





RE: Atmospheric Galvanized Steel Tank
JHernandez
RE: Atmospheric Galvanized Steel Tank
You seem to assume that "atmospheric" means less than 15 PSI gauge pressure. Less than 15 PSI gauge pressure will exempt it from the ASME PV code, but doesn't mean it's atmospheric, either. Larger tanks designed for atmospheric service are only adequate for very small pressures. If this is a small tank, it might be adequate for much more. Ditto on the allowable vacuum- very low on large tanks, more on smaller tanks.
Regardless of the size, I wouldn't won't to be in the vicinity when a 300-degree tank popped a rupture disk.
At 302 degrees, there should be some reduction in the strength. You could check the design versus ASME B&PV for that temperature.
I'm thinking zinc melts at around 800 degrees, so you won't just melt the zinc off of it. I don't know if corrosion resistance drops off at the elevated temperature, though.
RE: Atmospheric Galvanized Steel Tank
JHernandez
RE: Atmospheric Galvanized Steel Tank
H=11" T-T
JHernandez
RE: Atmospheric Galvanized Steel Tank
I don't know of any reason why not.
2)Being an atmospheric galvanized steel tank, can I install a rupture disc say 8 psig (has to be <15 psig for atmospheric)?
The maximum allowable pressure is likely to be less than 8 psi. You can evaluate per ASME B&PV code or API-620. API-620 is easier to use, but actually only covers up to 250 degrees. Pressure rating will depend on details of the cone-shell junction among other things. The tank should preferably be vented with a pressure-vacuum type vent.
3) What "vacuum pressure" would this type of tank be designed for, ~ 10"WC?? As a rough guess, 1-3 PSI, so the 10" WC probably wouldn't be too bad. You can evaluate it for vacuum per ASME B&PV Code, API-650, or stability formulas in Roark's Formulas For Stress and Strain.
RE: Atmospheric Galvanized Steel Tank
If a certain code is applicable in your area, you will have to evaluate the equipment and get certification, don't you?
Just being conservative, especially since steam at >300 deg F is what you have in mind.
RE: Atmospheric Galvanized Steel Tank
RE: Atmospheric Galvanized Steel Tank
RE: Atmospheric Galvanized Steel Tank
RE: Atmospheric Galvanized Steel Tank
RE: Atmospheric Galvanized Steel Tank
You could install a vacuum breaker.
http://virtualpipeline.spaces.msn.com