A steam heating boiler that is to be shut down for six months during the summer, should be
a) left with the water at normal working level and pressurized with air to 50 kPa
b) drained, thoroughly dried out, quick lime placed inside and closed up
c) A completely water filled boiler with the vent open to atmosphere
d) drained, thoroughly dried out, quick lime placed inside and left open
e) left with the water at normal working level but opened up to atmosphere
Answer: B