DNV DNVGL-ST-0358 PDF

General

This standard for certification describes the procedures and requirements for obtaining certificates for offshore gangways.

The following topics are covered:

— design approval

— materials

— welding

— production

— testing.

Requirements for operational procedures and training as required for type 3 gangways (see [1.4.3]), are not part of the scope.

Passive and active systems

The scope of this standard covers both passively and actively motion compensated gangways.

— The design of passive motion compensated gangways incorporates features that allow the gangway to accommodate the relative motions between vessels without making use of any external systems or equipment.

— Active motion compensation implies a system powered by an external power supply that reduces or cancels (compensates) the effect of the vessel motions (from one degree of freedom to all 6 degrees of freedom) on the gangway structure.

Types of gangways

The standard covers the following types as related to the operation of the gangway:

Type 1 – Uncontrolled flow of people, routine personnel transfer

— people move freely between the connected units

— connection time: indefinite

— gangway is supported in X, Y and Z axis directions at both ends

— gangway shall not be permanently connected to at least one of the units

— gangway shall contain means to self-detach at one end and move away in a safe manner and short time.

Type 2 – Controlled flow of people, routine personnel transfer.

— People do not move freely between the connected units; the flow of people is controlled/regulated by means of manual (i.e. the gangway operator) or automatic control.

— Connection time: usually less than 24 hours; the control of the flow of people shall be ensured throughout the entire connection time.

— At least one end of the gangway is supported in the X, Y and Z axis directions

— Gangway shall contain means to self-detach at one end and move away in a safe manner and short time.

Type 3 – Controlled flow of people, engineered personnel transfer.

— Gangways of more simplistic design to be used only in “Marine Operation” type personnel transfers.