ISO 20662:2020 pdf free download

05-21-2021 comment

ISO 20662:2020 pdf free download.Ships and marine technology Hopper dredger supervisory and control svstems.
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ISO 20662 specifies the components and structure, general requirements, and functional requirements of trailing suction hopper dredger supervisory and control systems.
It is applicable only to the installed components, functions or systems. It covers design, manufacture and modification.
2 Normative references
The following referenced documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8384, Ships and marine technology — Dredgers — Vocabulary
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purpose of ISO 20662, the terms and definitions given in ISO 8384 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
door, hopper emptying valve, bow coupling and winch and other equipment. The unloading system includes the bottom door position, pre-dumping door position, and hopper emptying valve state.
d) Dredge pump system: the dredge pump system should involve the monitoring and control of the dredge pump, including pump vacuum and pressure, pump speed, and pump power.
e) Jet water system: the jet water system should involve the monitoring and control of the jet pump, hopper jet water valve, and draghead jet water valve. The jet water system includes the jet water pressure, jet water flow, jet pump speed, jet pump power, hopper jet water valve state, and draghead jet water valve state sensors.
f) Dredge valve system: dredge valve system construction of mixture channel for dredging operation. It should involve the monitoring and control of the dredge valve.
4.2 Structure
The HD-SCS should adopt a multi-layer network structure, including equipment layer, process monitoring layer, and information management layer, as follows:
a) equipment layer: field instrumentation/sensors;
b) process monitoring layer: PLC, signals collecting and processing units, communication network;
c) information management layer: central monitoring and control station.
6.1.2 Operation
The STPM/STWC should have the following functLons for the equipment operation:
a) hoisting/lowering of the trailing suction tube(s):
b) controlling of gantries;
c) adjusting of the visor angle;
ci) stroke and pressure regulation of the swell compensator.
6.1.3 Controller
The STPM should have a STWC. which makes winches and gantries of the suction tube and swell compensators to work together to move the suction tube to a specified position or to hold the position. especially to ensure a constant dredging depth of the draghead.
6.1.4 Display
The STPM should display the following information:
a) top view, side view, and back view of the suction tube with relation to the dredgers position;
b) depth of draghead, and horizontal distance between draghead and hull; C) status of the suction tube in seated position;
ci) stroke of swell compensator:
e) position of the gantry.
6.1.5 Alarm
The STPM should give the alarm under the following circumstances:
a) the draghead position is below the maximum depth setpoint:
b) the suction tube is too close to the hull;
c) the suction tube is too close under the ship;
d) the suction tube is at the highest or lowest position;
e) the pivot vertical and horizontal angles are greater than the preset values.
6.1.6 Calibration
The depth of the draghead can be calibrated in the STPM.
6.2 DSLS
6.2.1 Preset
The following information can be set in the DSLS:
a) ship displacement table and hopper capacity table;
b) parameters of draught and hopper level sensor:
c) water density and undisturbed soil density at the construction site.
6.2.2 OperatIon
The DSLS should have the following functions for the equipment operation:
a) open/close of the light mixture overboard valve;
b) open/close of the loading valve;
c) adjusting of the overflows position.
6.2.3 Controller
The DSLS should have a LMO, which makes some dredge valves to work together to achieve the right mixture to flow overboard or to flow into the hopper according to the velocity and density of the mixture.
6.2.4 DIsplay
The DSLS should display the following information:
a) draught, displacement, light weight, loading, trim;
b) loading mixture density, loading mixture flow;
c) hopper level, mixture volume in hopper, load;
d) position of adjustable overflow;
e) curve of hopper level, mixture volume In hopper, load.
6.2.5 Alarm
The DSLS should give the alarm when draught is over the pre-set value.
6.2.6 CalIbration
The actual light ship weight can be calibrated in the DSLS.
6.3 Unloading system
6.3.1 Preset
The following Information can be set in the unloading system:
a) individual or grouping-bottom doors;
b) selection of shallow water dump and direct dump modes;
c) shallow water dump depth setpoint;
d) hopper self-emptying valve operation.
6.3.2 OperatIon
The unloading system should have the following functions for the equipment operaflon:
a) individual or group operation of the bottom door;
b) open/close, position regulation of the bottom door;
c) open/close of the pre-dumping door’
6.5 Jet water system
6.5.1 Preset
The following information can be set in the jet water system:
a) hopper jet water valve operation;
b) selection of Individual or series mode of the jet pump.
6.5.2 Operation
The jet water system should have the following functions for the equipment operation:
a) start, sLop, speed regulation. etc. of the jet pump:
b) open/close of the hopper let water valve;
c) open/close of the draghead jet water valve,
6.5.3 DIsplay
The jet water system should display the following information:
a) jet water pump pressure/Flow;
b) jet water pump speed, pump power
c) status oF hopper jet water valve;
d) status of draghead water valve.
6.5.4 Alam
The jet water system should give the alarm when jet water valve operation fails.
6.6 Dredge valve system
6.6.1 Preset
The following information can he set in the dredge valve system:
a) setting of the dredge valve assemble based on various dredging operation modes;
b) selection of the dredging operation mode.
6.6.2 Operation
The dredge valve system should have the following lunctions for the equipment operation:
a start, stop of the flushing pump;
b) individualorgroupclose/open of the dredge valve;
e) opening/closing of the adjustable water inlet valve on the draghead.
6.6.3 DIsplay
The dredge valve system should display the following information:
a) dredge operation mode.

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