High temperature.
High temperature.
(OP)
Hello all. Hypothetical scenario.
I have a cylinder 6 feet tall. 2 feet dia.
An electrical immersion heater is fitted in the top of a cylinder with the fail safe disabled. This is placed 2 feet from the top of the cylinder.
The cylinder has a manual vent at the top to aid venting the air after filling with water and is then shut tight.
Their is a cold feed at the bottom of the upright cylinder feeding water from a cold cistern 10 feet above.
The immersion is energised indefinately with the fail safe disabled.
What happens next ??.
Many Thanks.
I have a cylinder 6 feet tall. 2 feet dia.
An electrical immersion heater is fitted in the top of a cylinder with the fail safe disabled. This is placed 2 feet from the top of the cylinder.
The cylinder has a manual vent at the top to aid venting the air after filling with water and is then shut tight.
Their is a cold feed at the bottom of the upright cylinder feeding water from a cold cistern 10 feet above.
The immersion is energised indefinately with the fail safe disabled.
What happens next ??.
Many Thanks.





RE: High temperature.
RE: High temperature.
If there is no backflow prevention, then as the water heats up and possibly boils, you'll just back water up into the cistern.
If there is some sort of backflow preventer, then some sort of rupture would be likely. It could be an explosion, or more gradual.
If the heater is not too high a wattage, you could also just reach an equilibrium where heat loss in the rest of the tank equals heat input at the heater. The contents would have to warm up some for this to happen, which raise pressure or move water somewhere.
RE: High temperature.
If a vent is fitted to this set up will any hot water go back up the cold feed ??.
RE: High temperature.
With an open vent with its opening at least as high as the high liquid level in the cistern, I'd guess that the steam will burp out the vent rather than backfeed into the cistern.
jt