4.5.50 The pump unit shall be equipped with sturdy weatherproof steel canopy suitable for outdoor use.4.5.51 The Contractor shall submit the calculations to demonstrate the discharge pressure and flow rate of the pump unit fulfilling the requirements as stipulated in Clause 3.5.1 in this Particular Specification for the Engineer's approval.4.5.52 The brand name, model, specification and test certificate of the pump unit shall be submitted to the Engineer for approval.