01 / APPLICATION OVERVIEW
Bar Grating and Riveted Grating for Chemical Plant Walkways
Bar grating and riveted grating provide durable walkway surfaces for chemical plants, where corrosion resistance, drainage, and safe personnel access govern panel selection.
Typical walkway locations include pipe rack routes, tank farm access, pump and compressor areas, sampling platforms, and stairways between process units. Both grating types allow rainwater and washdown water to drain through the walking surface. Riveted grating offers a different load distribution through riveted bar construction, while welded bar grating provides a familiar open-grid solution for routine pedestrian routes.
Selection requires the process exposure, chemical contact, temperature range, design loads, support spans, and bearing direction. Engineers should also compare welded, pressure-locked, and riveted construction, surface profiles, coating systems, and fixing methods against the plant’s corrosion allowance, cleaning practices, and maintenance access requirements.
Discuss Your Walkway
02 / APPLICATION SCENARIOS & REQUIREMENTS
Application Scenarios & Project Requirements
Review the operating conditions, users, loads, environment and project requirements before selecting the appropriate steel grating specification.
Pipe Rack and Utility Walkways
Bar grating provides continuous pedestrian routes along pipe racks and utility corridors. Panel layout should maintain clear escape paths, address drainage over pipe supports, and account for dropped objects or chemical drips from nearby lines and flanges.
Tank Farm Access Platforms
Walkways around storage tanks connect gauging hatches, sampling points, and stairways. Panels may be removable for equipment access. Coating selection should consider product contact, splash zones, and the local corrosion category around each tank.
Pump and Process Area Platforms
Grating platforms around pumps, mixers, and process equipment allow inspection and maintenance access while washdown water drains through the surface. Riveted grating may be considered where heavier concentrated loads or wider unsupported spans occur.
Plant Stairways and Escape Routes
Grating treads and landings provide consistent footing between process elevations. Serrated surfaces, defined nosings, and secure tread connections support safe use during routine operations and emergency egress, subject to the approved stair design and applicable access requirements.
03 / SPECIFICATIONS & PRODUCT OPTIONS
Common Specifications & Available Options
Compare materials, bearing bar sizes, spacing, surface types, finishes and panel dimensions to match the requirements of the application.
Specifications
| Parameter | Specification / Options |
|---|---|
| Material |
Carbon steel is common for general plant areas; austenitic stainless steel grades such as 304 and 316, or other project-approved alloys, may be specified where process exposure requires higher corrosion resistance. State the required material grade and standard for each walkway area. Material selection should follow the plant’s corrosion assessment. |
| Surface treatment |
Hot-dip galvanized after fabrication for suitable carbon steel areas; painted systems or uncoated stainless steel where specified. Coating selection should consider chemical splash, pH range, temperature, and cleaning agents. Confirm that the selected coating suits the actual chemical exposure at each location, not just general outdoor service. |
| Bar grating construction |
Welded bar grating with bearing bars joined by pressure-locked or resistance-welded cross bars. Bearing bar sizes commonly include 25 × 3, 25 × 5, 30 × 5, 32 × 5, and 40 × 5 mm. Bar depth × thickness. Verify supplier load tables for the specified material, span, and loading conditions. |
| Bar grating spacing |
Common bearing bar center-to-center pitches include 30 and 40 mm; cross bar pitches of 50 and 100 mm are typical. Clear openings depend on bar thickness. Opening size and orientation should satisfy the plant’s access and small-object retention criteria. |
| Riveted grating construction |
Bearing bars connected to reticuline bars by cold-pressed rivets. Common configurations include single-riveted and double-riveted panels, with bearing bar sizes such as 30 × 5, 32 × 5, 40 × 5, and 50 × 5 mm depending on supplier capability. Riveted construction distributes load through the riveted connections and is often considered for heavier loads or wider spans, subject to engineering verification. |
| Riveted grating spacing |
Typical riveted panels use reticuline bar spacing around 100 to 150 mm and rivet pitch according to the selected configuration. Confirm clear openings, rivet pattern, and load direction against the approved supplier data and project drawings. |
| Panel dimensions |
Illustrative panel dimensions include 600 × 1,000, 800 × 1,200, 1,000 × 1,000, 1,000 × 1,200, and 1,000 × 3,000 mm, with cut-to-size fabrication from approved walkway layouts. Bearing direction and allowable unsupported span must be stated separately. Panel length does not establish load capacity. |
| Walking surface |
Plain or serrated bearing bars. Serrated profiles are commonly considered where washdown water, rain, or chemical residue affects footing. Verify serrated load data for the selected section. Surface profile does not remove the need for regular cleaning of chemical deposits. |
| Edges and openings |
Banded panel edges, reinforced pipe and equipment cut-outs, and project-specified toe plates. Openings for instruments, valves, and cable routes are dimensioned from approved drawings. Cut bearing bars may require additional support. Opening protection follows the platform safety design. |
| Fixings |
Project-specified grating clamps, retaining plates, or welded connections. M8 and M10 fixings are common where compatible with the selected clamp and support detail. Stainless fasteners may be specified for corrosive areas. Define fixing quantity, location, and material compatibility with both the grating and supporting steel. |
| Load and bearing direction |
Bearing bars span between supporting members. Confirm clear span in mm, uniformly distributed load in kN/m², concentrated load in kN, contact area, and allowable deflection in mm for each walkway area. Check ladder access points, temporary equipment, and washdown loading separately. Specify minimum end bearing on the drawings. |
Need a different size? Send your layout for a custom panel review.
Request Your SpecificationThe sizes above are reference examples, not approved combinations for every span. Confirm the bearing direction, loads, clear span and material before ordering. Panel size does not indicate the allowable unsupported span.
WHY USE STEEL GRATING?
Advantages for Steel Grating Applications
Continuous Drainage Through Open Panels
Both grating types allow rainwater and washdown water to pass through the walking surface. This reduces standing water on elevated walkways, although chemical residues and solids must still be removed through regular cleaning.
Corrosion-Resistant Material Options
Hot-dip galvanized carbon steel, painted systems, and stainless steel grades such as 304 and 316 allow each walkway area to match its actual chemical exposure. Material selection should follow the plant’s corrosion assessment rather than a single site-wide finish.
Riveted Construction for Heavier Duties
Riveted grating distributes load through riveted bar connections and is often considered where wider spans, concentrated loads, or heavier service occur. Suitability should be confirmed with verified load data for the specific panel configuration.
Serrated Surface Availability
Serrated bearing bars provide additional footwear contact on walkways exposed to rain, washdown water, or process residue. Their effect on load capacity should be checked for the selected bar section before specification.
Removable Access Panels
Individually retained panels provide planned access to equipment, valves, and instruments below walkways. Defined removal points and manageable panel weights support maintenance while allowing damaged sections to be replaced without disturbing the route.
Fit Around Existing Process Steelwork
Drawing-based fabrication accommodates pipe supports, cable trays, handrail posts, and equipment penetrations. Coordinated panel joints and reinforced openings help preserve support continuity around congested plant structures.
04 / INSTALLATION & PROJECT PHOTOS
Installation Guidance & Application Photos
Review the panel layout, support conditions, fixing methods and fabrication details before installation, and refer to the application photos for practical examples.
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Verify Supports and Exposure Conditions
Check support locations, clear spans, elevations, and required end bearing against the approved drawings. Confirm design loads and coating or material selection for each area’s chemical exposure. Complete the plant’s isolation and access controls before working near process equipment.
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Place Panels in the Approved Direction
Match panel identification to the walkway layout and orient bearing bars across the designated supports. Check joints, stair transitions, cut-out reinforcement, and clearances around handrails and toe plates. Obtain design approval before cutting bearing bars or changing support positions.
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Secure Panels With Compatible Fixings
Install the specified clamps, retaining plates, or welds at the approved locations. Use fasteners compatible with both the grating material and supporting steel to limit galvanic corrosion in chemical service areas. Apply the required tightening procedure and any specified retention details.
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Inspect and Establish Routine Maintenance
Check for rocking panels, unsupported edges, loose or corroded fixings, sharp projections, and blocked drainage. Repair coating damage using the project-approved method. Include panels, fixings, and surface condition in routine inspections, particularly where chemical contact or washdown is frequent.
05 / RELATED REFERENCE & FAQ
Frequently Asked Questions
What is the difference between welded bar grating and riveted grating?
Welded bar grating joins bearing bars to cross bars through pressure locking or resistance welding, forming the familiar open grid used for routine pedestrian walkways. Riveted grating connects bearing bars to reticuline bars with cold-pressed rivets and is often considered for heavier loads, wider spans, or higher impact exposure. Selection should use verified load data for each construction type under the project’s actual span and loading conditions.
Should chemical plant walkways use carbon steel or stainless steel grating?
The choice depends on the chemical exposure, temperature, cleaning agents, and the plant’s corrosion allowance for each area. Hot-dip galvanized carbon steel serves many general walkway locations, while stainless steel grades such as 304 and 316, or other approved alloys, may be required near aggressive process areas. Material selection should be assessed location by location rather than applied uniformly across the plant.
Which grating type suits heavier maintenance loads?
Riveted grating is often considered where concentrated loads, heavier equipment handling, or wider unsupported spans occur. Deeper welded bar sections can also be specified for heavy duty areas. Neither type should be selected without confirming the concentrated load, contact area, clear span, and deflection limit through verified load tables or calculation.
Are serrated surfaces necessary for chemical plant walkways?
Serrated grating is commonly considered where rain, washdown water, or process residue affects footing, especially on exterior routes and stair treads. Plain grating may suit controlled interior areas. Neither surface prevents slipping when chemical films or deposits remain on the walking surface, so coating selection should be combined with a regular cleaning routine.
How should grating be protected against chemical corrosion?
Protection starts with correct material selection for each exposure area. Hot-dip galvanizing suits many general outdoor and humid locations, but strong acids, alkalis, or solvents may require stainless steel or a project-specified coating system. Fasteners should be compatible with both the grating and supporting steel. Provide the chemical contact details, pH range, and temperature so the appropriate finish can be specified.
What information is needed for a chemical plant walkway quotation?
Provide the walkway layout, quantities, bearing direction, support spans, design loads, and material grade for each area. Include bar sizes and spacing, construction type, surface profile, coating requirements, stair treads, toe plates, fixing details, and removable panels. Identify chemical exposure, washdown frequency, and any heavy load areas so these conditions can be addressed before fabrication.
06 / PROJECT ENQUIRY
Tell Us About Your Walkway
Share your layout and operating requirements so our team can review the grating, fabrication and supply scope.
Send Drawings by Email Discuss on WhatsAppThe email button opens your mail app. Attach your drawings before sending.
Include these details
- Application location and exposure conditions
- Drawings, panel dimensions and quantities
- Support layout, clear span and design loads
- Material, finish and walking-surface requirements
- Cut-outs, fixings and removable access sections
- Destination, required delivery date and project standards
Already have a specification? Send it with your enquiry.