Boiler surfaces may have what appears to be blisters which are composed of
a) iron oxide
b) sodium sulphite
c) caustic soda
d) ferric sulphate
e) chelates
Answer: A
Boiler surfaces may have what appears to be blisters which are composed of
a) iron oxide
b) sodium sulphite
c) caustic soda
d) ferric sulphate
e) chelates