ISO 4641:2010 specifies the minimum requirements for textile-reinforced, smooth-bore rubber water-suction and discharge hoses and hose assemblies.Three types of hoses and hose assemblies are specified according to their operating duty requirements, i.e. their ambient and water temperature ranges:ambient temperatures: -25 ï¿1/2C to +70 ï¿1/2C;water temperatures during operation: 0 ï¿1/2C to +70 ï¿1/2C.