7.1.1 All sea tube
inlets, boxes, strainers and their fastenings should be inspected
for signs of corrosion and their condition reported. A large number
of sea tubes exist on warships and each will require thorough examination
when the opportunity arises during the period of survey. The condition
of gratings and their attachment is to be verified. Valves may require
to be removed for access. The opportunity should be taken to inspect
valves. A list of tubes inspected should be reported.
7.1.2 Sea tubes are
an integral part of piping systems and all shipside suction and discharge
valves require to be opened up for survey every six years. Examination
of valves should include seats, securing arrangements/studs, spindles,
threads, and sealing arrangements. It is important that valves are
correctly assembled and that they fully close. The operation of valves
from local and extended position should be checked for all shipside
valves. Where ships have ‘Ice Class’ notations, the de-icing
and recirculating arrangements should be checked.