The compressor unit has a leak that requires repairing.

$($a$)$ Why would the compressor unit be considered as a pressure system? $(4)$

Note: You should support your answer, where applicable, using relevant

information from the scenario.

$($b$)$ What measures should be taken to prepare for safe maintenance of the

compressor unit? $(15)$

Note: You should support your answer, where applicable, using relevant

information from the scenario.