GB/T 39656-2020 in English
VALIDTechnical requirements for dredging system design of self-propelled trailing suction hopper dredger
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | GB/T 39656-2020 |
| Document status: | VALID |
| Title in English: | Technical requirements for dredging system design of self-propelled trailing suction hopper dredger |
| Title in Chinese: | 自航耙吸挖泥船疏浚系统设计技术要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-12-14 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 47.020.01-General standards related to shipbuilding and marine structures |
| Chinese Classification: | U34-Special devices for auxiliary vessel and survey vessel |
| Professional Classification: | GB-National Standard |
| Related Keywords: | core design requirements system
system design typical parameters excavation system dredge head flow area matching accuracy production metering system requirements design requirements |
| Related Topics: | mud
dredger dredging dredger GBT39656 GB/T 39656-2020 dredging dredging design Dredging and hydraulic design |
《GB/T 39656-2020自航耙吸挖泥船疏浚系统设计技术要求》由TC530（全国港口标准化技术委员会）、全国海洋船标准化技术委员会联合归口，TC530SC1（全国港口标准化技术委员会疏浚装备分会）执行，主管部门为交通运输部。
Introduction
Standard Overview
GB/T 39656-2020 was proposed by the Ministry of Transport of China and jointly managed by the National Technical Committee for Standardization of Ports (SAC/TC 530) and the National Technical Committee for Standardization of Marine Vessels (SAC/TC 12). The standard specifies the design basis, design requirements, technical documents and design verification of the dredging system of a self-propelled trailing suction dredger.
Core design requirements
| System modules | Key technical indicators | Typical parameters |
|---|---|---|
| Excavation system | Dredge head flow area matching, hydraulic system independent unit | Dredging speed 2-4 knots, maximum digging angle ≤60° |
| Dredge pump system | NPSH ≤4m, double-casing pump configuration | Dredge depth＞45m requires underwater mud pump |
| Loading system | Energy dissipation box flow area matching | Total opening area 6-10 times the box area |
Key technology analysis
1. Active drag head design
The standard requires the use of an active drag head with adjustable angle in real time, and the hydraulic system needs to be designed as an independent unit. Typical case: A certain type of drag head achieves ±15° dynamic adjustment in the Yangtze River Estuary Project to adapt to excavation of different soil types.
2. Mud gate mechanical calculation
The formula for calculating the tension of the mud gate hydraulic cylinder is: F=κR₁(κ₁F₁+F₂-F₃), where the safety factor R₁ is 1.2-1.3, and the cone mud gate shape factor κ₁=1.
3. Monitoring system accuracy
Production metering system requirements: mud flow error ≤±3%, density error ≤±3%, draft measurement error ≤±0.10m.
Implementation recommendations
- Material selection: The mud door panel should be made of NM400 grade wear-resistant steel plate, which can reduce the wear rate by 40%
- Verification process: It needs to pass the dual verification of mooring test (static) and dredging test (dynamic)
- Document management: It includes at least 33 technical documents (see Table 1), with a focus on reviewing the pump room layout and control system diagram
Standard evolution analysis
Compared with the old version of the standard, the 2020 version has the following major updates:
1. Added independent requirements for the hydraulic system of the active drag head
2. Refined the mechanical calculation formula of the mud door
3. Improved the accuracy index of the monitoring system
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