ISO 20661:2020 pdf download Ships and marine technology — Cutter suction dredger supervisory and control systems
6 Functional requirements
6.1 Preset/setup
The following preset points should be included.
a) Dimensions settings: special geometrical parameters of the dredger used for the calculations of monitoring and control values can be entered by authorized personnel only.
b) System settings: control parameters to adjust the behaviour and characteristic of system components can be entered.
c) Process settings: all settings that the dredge operator may change for typical operation.
6.2 Spuds and spud carrier system
The system should have the following functions for the working spud with carrier and auxiliary spud:
a) move each spud up or down;
b) activate free fall for each spud;
c) spud carrier fully in;
d) spud carrier fully out;
e) spud carrier one step in;
f) spud carrier one step out;
g) spud carrier in;
h) spud carrier out;
i) display the relevant measured values for spuds and the spud carrier system on the SCADA monitors in graphical or numeric form.
6.3 Cutter system
The system should have the following functions for cutter systems:
a) cutter drive start;
b) cutter drive stop;
c) cutter emergency stop;
d) cutter speed control;
e) cutter manual local control for (safe) cutter change;
f) display the relevant measured values for the cutter system on the SCADA monitors in graphical or numeric form.
6.4? Submersible? dredge? pump? system
The system should have the following functions for the submersible dredge pump system:
a) to start all subsystems of the submersible dredge pump;
b) to stop all subsystems of the submersible dredge pump;
c) submersible dredge pump start;
d) submersible dredge pump stop;
e) submersible dredge pump emergency stop;
f) submersible dredge pump speed control;
g) display the relevant measured values for the submersible dredge pump system on the SCADA
monitors in graphical or numeric form.
6.5? Inboard? dredge? pumps
The system should have the following functions for inboard dredge pumps:
a) inboard dredge pump start;
b) inboard dredge pump stop;
c) inboard dredge pump emergency stop;
d) inboard dredge pump speed control;
e) display the relevant measured values for inboard dredge pumps on the SCADA monitors in
graphical or numeric form.
6.6 Dredge valves
The system should have the following functions for dredge valves:
a) the valves should manually be controlled by individual or interlocked close/open operation;
b) the respective open or close output for indication of actual valve position should be displayed on
the SCADA monitors in a mimic graphical form.
6.7 Ladder winches
The system should have the following functions for ladder winches:
a) ladder winch selection: single mode, combined mode (if applicable);
b) ladder winch start;
c) ladder winch stop;
d) ladder winch emergency stop;
e) hoisting and lowering the ladder with the set speed;
f) display all the relevant measurement and computation data values for ladder winches on the SCADA
monitors in graphical or numeric form.
6.8 Swing winches
The system should have the following functions for swing winches:
a) swing winch selection: single mode, combined mode (if applicable);
b) swing winch start;
c) swing winch stop;
d) swing winch emergency stop;
e) hauling and veering the swing winch with the set speed;
f) display all the relevant measurement and computation data values for swing winches on the SCADA monitors in graphical or numeric form.
6.9 Anchor hoisting winches and guy winches
The system should have the following functions for anchor hoisting winches and guy winches:
a) operation control of anchor hoisting winches and guy winches;
b) stop control of the anchor hoisting winches and guy winches;
c) speed control of the anchor hoisting winches and guy winches with set speed;
d) display all the relevant measurement and computation data values for anchor and guy winches on the SCADA monitors in graphical or numeric form.ISO 20661:2020 pdf download