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1. Project Overview
This project involved the supply of hot-dip galvanized steel grating trench covers for an industrial drainage system in a large-scale manufacturing facility.
The client required a reliable solution to cover open drainage channels while ensuring high load-bearing capacity, effective water drainage, and long-term corrosion resistance in an outdoor industrial environment.
The installation area includes production workshops, logistics passages, and vehicle-access zones, where both pedestrian and light vehicle traffic are present.
2. Project Requirements
The customer’s main requirements included:
High load capacity for light vehicles and forklifts
Safe anti-slip surface for pedestrian traffic
Efficient drainage performance without blockage
Resistance to corrosion in outdoor and chemical environments
Removable design for easy maintenance and cleaning
3. Product Specification
The supplied trench cover steel grating specifications are as follows:
| Item | Specification |
|---|---|
| Material | Q235 Carbon Steel |
| Type | Welded Steel Grating Trench Cover |
| Bearing Bar Size | 30×5 mm / 40×5 mm |
| Bearing Bar Pitch | 30 mm / 40 mm |
| Cross Bar Pitch | 100 mm |
| Surface Treatment | Hot-Dip Galvanized (ISO 1461) |
| Load Type | Light to Medium Duty / Forklift Traffic |
| Application | Drainage trench cover / industrial drainage system |
4. Engineering Solution
To meet the project requirements, we designed a reinforced welded steel grating trench cover system with optimized load distribution.
Key engineering features include:
Reinforced bearing bars for improved load resistance
Optimized bar spacing to balance drainage and strength
Removable panel design for easy inspection and cleaning
Anti-slip surface to enhance safety in wet conditions
Hot-dip galvanized coating for long-term corrosion protection
The structure ensures that rainwater and industrial wastewater can flow freely while preventing debris accumulation.
5. Application Areas
The steel grating trench covers were installed in the following areas:
Factory floor drainage channels
Outdoor logistics pathways
Loading and unloading zones
Vehicle access roads inside the plant
Chemical processing workshop drainage systems
The system effectively integrated with existing concrete trench structures.
6. Project Results
After installation, the client achieved significant improvements:
Enhanced safety for both pedestrians and forklifts
Reduced blockage issues compared to traditional concrete covers
Improved drainage efficiency during heavy rain
Lower maintenance frequency and cleaning costs
Extended service life due to corrosion-resistant coating
The modular structure also allows for easy replacement of individual sections.
7. Frequently Asked Questions (FAQ)
Q1: What load capacity can trench cover steel grating support?
A1: It can be designed for pedestrian, light vehicle, or forklift loads depending on bar thickness and spacing.
Q2: Will steel grating block water drainage?
A2: No, the open structure allows continuous water flow while filtering larger debris.
Q3: Can trench covers be customized in size?
A3: Yes, panels can be custom-cut to match any trench dimensions.
Q4: Is hot-dip galvanizing necessary for trench covers?
A4: Yes, it significantly improves corrosion resistance, especially in outdoor and wet environments.
Q5: How are trench cover panels installed?
A5: They are typically placed on steel or concrete frames and secured with clips or welding depending on the design.
Steel grating standard
|
Country |
Steel grating standard |
Steel material standard |
Hot galvanizing standard |
|
China |
YB/T4001-1998 |
GB 700-88 |
GB/T13912-2002 |
|
USA |
ANSI/NAAMM(MBG531-88) |
ASTM (A36) |
ASTM(A123) |
|
England |
BS4592-1987 |
BS4360 ( 43A) |
BS729 |
|
Australia |
AS1657-1992 |
AS3679 |
AS1650 |
Specifications of steel gratings
| Specifications of steel gratings | ||
| No | Item | Description |
| 1 | Bearing bar | 20x5, 25x3, 25x4, 25x5, 30x3, 30x4, 30x5, 32x3, 32x5, 40x5, 50…75x8mm, etc. |
| 2 | Bearing bar pitch | 25, 30, 30.16, 32.5, 34.3, 40, 50, 60, 62, 65mm, etc. |
| 3 | Cross bar | 5x5, 6x6, 8x8mm (twisted bar or round bar) |
| 4 | Cross bar pitch | 40, 50, 60, 65, 76, 100, 101.6, 120, 130mm or as customers' requirements. |
| 5 | Surface treatment | Untreated, Hot dip galvanized, Cold dip galvanized, Painted, Powder coated, or as per customers' requirement. |
| 6 | Flat bar type | Plain, Serrated (tooth-like), I bar (I section) |
| 7 | Material standard | Low carbon steel (CN: Q235, US: A36, UK: 43A) |
| 8 | Galvanization standard | CN: GB/T13912, US: ASTM (A123), UK: BS729 |
| 9 | Steel grating standards | A. China: YB/T4001-1998 |
| B. USA: ANSI/NAAMM (MBG 531-88) | ||
| C. UK: BS4592-1987 | ||
| D. Australia: AS1657-1988 | ||
| E: Japan: JJS | ||
GNEE STEEL Customer visit
Packaging and shipping
We provide custom-engineered steel grating trench cover systems for industrial, municipal, and commercial drainage applications.
If you require customized load design, sizing, or surface treatment options, feel free to contact us for technical support and quotation.