Hi all i believe it is that time when i need to replace all the hoses feeding the plate stack

i am told it should be done every 2 years by one organization and 5 years by another...
dose any one here know if there is legislation in place that states a time frame they must be replaced by ( in Australia ) ?
as the actual hoses on this system are dated 1997 and are made of a steel braid outer

i have called a few local hose manufactures and they have no idea on what type of material to use or how often they should be replaced and i do not know exactly what type of material they need to use other then it is stainless steel braided outer.

looking for some advice on this one
cheers