For the benefit of Kevplumb and Steve69the69Gas.
This was mentioned in the topic about Unvented Water Cylinders, but that topic has been locked.
Not the same thing at all.
http://www.jacktroop.co.uk/corgistu...llation of thermoplastic storage cisterns.pdf
"BS 4213:2004 Cisterns for domestic use- Cold Water Storage and combined feed and expansion (thermoplastic) cisterns up to 500 litres. Specification - requires that a cistern be tested for resistance to hot water for a continuous period of 500 hours and after a cooling period of 2 hours, the cistern is required to meet the following conditions:
there shall be no overflow from the top edge of the cistern or any other visible signs of leakage;"
If filled with boiling water, the cistern can distort and, being thermoplastic, it will distort. However it cannot distort to the extent that it leaks or overflows. The fatal incident mentioned in the Corgi report was the result of inadequate support under the cistern, causing the cistern to collapse when a faulty immersion heater allowed the cistern to be filled with scalding water.
Clear?
This was mentioned in the topic about Unvented Water Cylinders, but that topic has been locked.
kevplumb said:
Steve69the69Gas said:
Not the same thing at all.
http://www.jacktroop.co.uk/corgistu...llation of thermoplastic storage cisterns.pdf
"BS 4213:2004 Cisterns for domestic use- Cold Water Storage and combined feed and expansion (thermoplastic) cisterns up to 500 litres. Specification - requires that a cistern be tested for resistance to hot water for a continuous period of 500 hours and after a cooling period of 2 hours, the cistern is required to meet the following conditions:
there shall be no overflow from the top edge of the cistern or any other visible signs of leakage;"
If filled with boiling water, the cistern can distort and, being thermoplastic, it will distort. However it cannot distort to the extent that it leaks or overflows. The fatal incident mentioned in the Corgi report was the result of inadequate support under the cistern, causing the cistern to collapse when a faulty immersion heater allowed the cistern to be filled with scalding water.
Clear?
