Ships and marine technology — Winches for trailing suction hopper dredger
1Key Takeaways
This document specifies the requirements for the design, operation, performance and acceptance test of the hydraulic or electric winches for trailing suction hopper dredgers. This document specifies the winches required to operate the suction pipe during dredging of the trailing suction hopper dredger winch, mainly inc…
2Expert Interpretation
Comprehensive analysis of the technical requirements of ISO 4862:2023 international standard for towed suction dredger winches, covering the design specifications, performance parameters, acceptance tests and marking requirements for hydraulic/electric winches, with a focus on the structural standards and safe load indicators of suction head winches, universal joint winches and trunnion winches.
Interpretation of the core content of the standard
ISO 4862:2023 establishes a complete technical system for the special winches of towed suction dredgers. The standard is applicable to three types of equipment: suction head winches, universal joint winches and trunnion winches, which are hydraulically/electrically driven. The document clearly stipulates the differentiated requirements for rated load (Clause 3.5) and maximum load (Clause 3.7), among which the material stress under the rated load condition shall not exceed 40% of the yield strength (Clause 5.3.1).
Comparison of key design parameters
| Parameter type | Technical requirements | Test standard |
|---|---|---|
| Drum diameter | ≥18 times the diameter of the wire rope (Clause 5.6.2) | ISO 2408:2017 |
| Braking device | Required to withstand maximum load (Clause 5.5.2) | ISO 4413/IEC 60092 |
| Operating temperature | Continuous operation at rated load for 30 minutes (Clause 5.7.3) | 7.3 Acceptance test |
Technology evolution analysis
Compared with the old version of the standard, the main updates of the 2023 version are:
1. Added wire rope type requirements (6×36WS-IWRC or 6×41WS-IWRC, 5.6.1.1 clause)
2. Refined speed classification system (three series A/B/C, Table 1)
3. Strengthened hydraulic system sealing detection (7.5.a clause)
Application case: 200kN hydraulic suction head winch
A winch with a model marked as "ISO 4862-H-20-A/BR" means:
- H: Hydraulic drive
- 20: Rated load 200kN
- A/B: Dual speed (6m/min and 12m/min)
- R: Right-hand drive (Clause 4.a)
Implementation suggestions
1. Material selection: Alloy steel with ReL≥450MPa is preferred (Clause 5.3)
2. Acceptance process: Must include 30min no-load + 30min rated load + 3 tests of maximum load (Clause 7.2-7.4)
3. Safety margin: The stress under maximum load condition should be controlled within 90% of the yield strength (Clause 5.3.2)