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