ISO 20662:2020 pdf download.Ships and marine technology Hopper dredger supervisory and control systems.
ISO 20662 describes the supervisory and control system for a number of components, functions and systems that can, but do not have to, be installed on board of a hopper dredger. It does not prescribe that all described components, functions and systems need to he installed.
Ships anti marine echfl01ogY — supervisory and control systems
1 Scope
ISO 20662 specifies the components and structure, general reqUiremts and functional requirements of trailing suction hopper dredger supervisory and control systems.
It is applicable only to the installed comPOnefltsi functionS or systems. it covers designs manufactureand 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.
A hopper dredger is a self-propelled dredger with its own integrated hopper hold.
An HD-SCS, according to this document, is a basic system for supervising and controlling the dredging operations performed by a hopper dredger utilising sensors, networks, computers, and technologies concerning measurement, communication and automation.
An HD-SCS is an integrated SCADA system that can consist of the following subsystems, based on their functions.
a) STPM/STWC: STPM/STWC monitor excavation process. It should involve the monitoring and control of the suction tube, gantry, draghead, winch, swell compensator and other equipment. The STPM/STWC includes the suction tube vertical/horizontal angle, visor angle, swell compensator position, and valve/gantry state sensors.
b) DSLS: DSLS monitor loading process. It should involve the monitoring and control of overflows, light mixture overboard valve, loading valve and other equipment. The DSLS includes the dredger draught, hopper level, trim/heel, mixture density, mixture flow, overflow position, and valve state sensors.
c) Unloading system: unloading system monitor bottom dumping, rainbow/shore discharging
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.ISO-20662-2020