i) Located in positions where the possibility of blanking off the suction is minimized;
ii) Fitted with strainer plates through which the clear area is to be at least 1.5 times the area of the inlet valves;
iii) Means are provided for clearing the strainer plates, such as by using compressed air or low pressure steam;
iv) For sea chests on ice strengthened vessels, additional requirements in 6-1-1/47.15, 6-1-1/47.17 and 6-1-2/31.3 of the Steel Vessel Rules are to be complied with, where applicable