However, if exactly the same pump is moved to a differ-
ent tank where the offtake is 350 litres/minute, the primary
function is changed accordingly and so the maintenance
programme must now change to accommodate the higher
performance expectation.
Functions and performance expectations not only cover
output. They also concern issues such as product quality,
customer service, economy and efficiency of operation, con-
trol, containment, comfort, protection, compliance with
environmental regulations, structural integrity and even
the physical appearance of the asset.