SC/T 4048.2-2020 in English
VALIDGeneral Technical specifications for offshore cages - Part 2: Netting
- Issued on:2020-08-26
- Implemented on:2021-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | SC/T 4048.2-2020 |
| Document status: | VALID |
| Title in English: | General Technical specifications for offshore cages - Part 2: Netting |
| Title in Chinese: | 深水网箱通用技术要求 第2部分：网衣 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-08-26 |
| Implemented on: | 2021-01-01 |
| Professional Classification: | SC-Aquaculture |
| Related Keywords: | general technical specifications
new material specifications second part net nominal number netting introduction standard framework |
| Related Topics: | deep water
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Introduction
Standard Framework and Technological Evolution
As the second part of the SC/T 4048 series, this standard adds new material specifications such as UHMWPE twisted mesh compared with the 2008 version of GB/T 18673, reflecting the trend of deep-sea aquaculture equipment towards high strength and corrosion resistance.
Core Terminology System
| Terms | Definition | Detection Significance |
|---|---|---|
| K-type mesh | Abnormal mesh with uneven day legs | Affects the hydrodynamic performance of the net box |
| Slip knot | Defective knot that can slide on the net line | Reduces the structural stability of the net |
| Nominal number of strands | Total number of monofilaments/yarns | Determines the basic strength of the net line |
Comparison of Net Classification Systems
Typical case: A deep-sea aquaculture company selected UHMWPE-111tex×15 warp knitted mesh, which has a hole rate of <0.03%, 40% higher than that of traditional PE mesh, reducing the loss of cage damage by about 1.2 million yuan during the typhoon season.
| Type | Material | Breaking strength coefficient | Applicable water depth |
|---|---|---|---|
| Knotted mesh | PE monofilament | 379-1440N | ＜30m |
| Knotless mesh | UHMWPE | ≥SC/T 5022 | ＞50m |
Analysis of key technical indicators
Appearance quality control
The yarn skipping rate of meshes with more than 5 strands must meet the strict formula of (0.01%×nominal number of strands). For example, the allowable value for a 15-strand mesh is 0.15%, reflecting the precision requirements of high-density mesh clothing.
Mesh length deviation
PA multifilament meshes allow a ±4.0% deviation when a≤50mm, which is stricter than the ±5.5% of PE meshes, ensuring the dimensional stability advantage of polyamide materials.
Implementation Suggestions
- For deep-sea aquaculture, UHMWPE warp knitted mesh is preferred, as its longitudinal breaking strength is three times that of traditional materials.
- During the acceptance of nets, hidden defects such as slip knots and K-type meshes should be inspected.
- The dimensional stability of shaped meshes (Class 1) is more than 20% higher than that of unshaped meshes (Class 2).
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