1.2.1 An umbilical may consist of a sheathed or braided bundle of hoses and
cables which provides the life-support between the surface and a submersible or
diving bell and where applicable, between the bell and the diver. An umbilical may
include an integral strength member or lifting line capable of raising the bell in
the event of emergency.
1.2.2 Life-support hoses are those used for the supply and return of gases, gas
mixes and hot water for heating purposes.
1.2.3 An umbilical as defined in Pt 5, Ch 5, 1.2 Definition of an umbilical 1.2.1 does not include the life-support pipework on the
deck of the diving support unit which should be of metallic construction except
where hoses of an approved type are permitted.
1.2.4 The design pressure is the maximum permissible working pressure
corresponding to the maximum depth at which the submersible will operate in normal
service and is to be not less than the highest set pressure of any associated safety
valve or relief valve.