Manufacturing Load-Bearing Metal Structures for Platforms

The role of process platforms and service walkways at plants

Process platforms and service walkways are load-bearing metal structures that provide access to equipment, pipelines, bottling lines, conveyors, and other production units. Their design affects:

• personnel safety;
• ease of maintenance and repair;
• the possibility of upgrading lines without shutting down the entire shop;
• compact placement of equipment.

In the conditions of Tashkent and regional production facilities, additional requirements are imposed on such metal structures: operation in high dust, temperature fluctuations, and sometimes outdoors under the sun.

Types of load-bearing metal structures for platforms and walkways

The following elements are usually used for process platforms and service walkways:

• platform frame — columns, beams, trusses, bracing;
• decking — chequered plate, grating, sometimes stainless steel in areas with aggressive environments;
• stairs and flights — straight, turning, portable, emergency;
• guarding — handrails, toe boards, protective screens;
• brackets and cantilever extensions — for fastening pipelines, cable trays, light equipment;
• connection nodes to existing structures — supports to columns, walls, foundations.

Each type of element affects calculation, manufacturing technology, and final cost differently. That is why a properly prepared technical specification (TOR) is the key to accurate calculation of metal structures.

Stage 1. Collection of initial data and calculation based on the TOR

Work with load-bearing metal structures for platforms and walkways starts not with production, but with engineering analysis.

What the TOR must include

To perform calculations based on the customer’s TOR, the following are required:

• layout of the shop or area with reference to existing structures;
• elevation marks (floor levels, equipment, pipelines);
• expected loads: people, equipment, transported goods;
• operating conditions: indoor/outdoor, humidity, aggressive environment, temperature regime;
• requirements for decking (type, spacing, anti-slip);
• requirements for stairs and guarding (width, height, handrail type);
• limitations on dimensions and weight of elements for installation;
• desired manufacturing and installation deadlines.

The more detailed the TOR, the more accurate the calculation and the lower the risk of metal overconsumption or rework on site.

Preliminary calculation and layout

At this stage:

• a scheme of the platform and walkway frame is formed;
• cross-sections of columns, beams, trusses are selected;
• spans and support spacing are calculated;
• the mass of metal structures and approximate production lead times are estimated.

The result is a preliminary commercial offer tied to the TOR, which specifies indicative deadlines and a cost range depending on the selected materials and technologies.

Stage 2. Design and verification of load-bearing capacity

After the concept is agreed, detailed design begins.

Design documentation

The following are developed:

• general views of platforms and walkways;
• layouts of columns, beams, trusses, bracing;
• connection nodes to foundations and existing structures;
• layouts of stairs, guarding, decking;
• specifications of rolled steel and fasteners.

Calculation verification

For process platforms and service walkways it is important to consider:

• static loads (self-weight, equipment, people);
• possible dynamic loads (movement of personnel, vibrations from equipment);
• wind and, if necessary, snow loads for outdoor sections;
• specifics of local conditions (for example, dust, possible corrosion).

The result is a set of drawings that can be used to launch the metal structures into production.

Stage 3. Selection of materials and manufacturing technologies

The choice of materials and technologies directly affects both lead time and cost.

Materials

Most commonly used:

• carbon steel for main load-bearing elements (columns, beams, trusses);
• hollow sections and I-beams for frames and walkways;
• sheet metal for decking, steps, service platforms;
• stainless steel for areas with increased corrosion, near aggressive environments or in zones with sanitary requirements (for example, near food equipment);
• fasteners, anchors, fixings — selected according to the type of base and operating conditions.

Processing technologies

The following are used in manufacturing:

• laser cutting — for precise cutting of sheet parts, gussets, brackets;
• metal bending — for manufacturing profiles, steps, guarding elements;
• mechanical cutting and drilling — for holes for bolted connections;
• welding — for assembling frames, trusses, nodes;
• powder coating or other protective coatings — for corrosion protection and increased wear resistance.

The choice between welded and bolted connections, type of coating, and decking material is discussed with the customer at the TOR calculation stage, as this significantly affects cost and lead time.

Stage 4. Technological cycle: from cutting to painting

After the working documentation and materials are approved, the production cycle begins.

Cutting and preparation of parts

1. Cutting sheet and profiles into blanks according to cutting maps.
2. Laser cutting of complex contours, holes, gussets.
3. Metal bending for steps, handrail elements, reinforcements.

At this stage it is important to optimize cutting maps to reduce metal waste — this directly affects the price.

Welding and assembly of nodes

1. Assembly of frames and trusses on jigs or fixtures to ensure geometry.
2. Welding of columns, beams, brackets, stair flights.
3. Cleaning of welds and, if necessary, grinding of visible areas.

For load-bearing metal structures, special attention is paid to the quality of welded joints, as the reliability of platforms and walkways depends on them.

Surface preparation and painting

1. Mechanical or abrasive cleaning of the surface.
2. Degreasing and preparation for painting.
3. Powder coating or application of another protective coating.

For outdoor sections and aggressive environments, more robust corrosion protection is recommended. This increases service life but affects budget and lead time.

Geometry control and weld quality

Checks are carried out at each stage:

• control of dimensions and tolerances after cutting and bending;
• checking diagonals and geometry of frames and trusses during assembly;
• visual inspection of welds, and, if necessary, additional testing methods;
• checking thickness and uniformity of coating after painting.

For platforms and walkways that will be used with constant personnel access, misalignment, sharp edges, lack of fusion, and defects that could lead to an emergency situation are unacceptable.

Assembly, marking, logistics, and installation on site

Assembly and marking

Large-node assembly is carried out at the production facility:

• assembly of stair flights;
• preparation of guarding sections;
• assembly of fragments of platform and walkway frames.

Each element is marked in accordance with the drawings so that installation on site proceeds without delays.

Logistics and installation

When planning, the following are taken into account:

• dimensions of elements for transportation on the roads of Tashkent and the regions;
• possibility of unloading and lifting to height at the customer’s site;
• installation sequence so as not to block equipment operation.

Installation is often carried out in stages, with minimal interference in the current production process.

What affects the price and lead time of manufacturing

The cost and lead time of manufacturing load-bearing metal structures for process platforms and service walkways depend on a number of factors. Below is a summary table.

That is why the specific price is always calculated based on the TOR. Without initial data, only a very rough estimate is possible.

Typical mistakes when ordering metal structures for platforms

1. Incomplete TOR regarding loads and operating conditions. As a result, the structure may be overdesigned (more expensive) or, conversely, insufficiently rigid.
2. No reference to existing structures. During installation it turns out that elevations do not match, and on-site rework is required.
3. Ignoring corrosive environments. Saving on coating leads to accelerated wear, especially on outdoor sections.
4. Ordering based only on overall dimensions without calculation. Attempting to “copy” an existing platform without calculation for new loads can be dangerous.
5. Mixing different types of steel without considering compatibility. This complicates welding and can cause corrosion problems at joints.
6. Underestimating logistics and installation. Large elements are difficult to bring into an operating shop, and have to be cut and re-welded.
7. Late approval of changes. Any changes after production has started lead to rework, schedule shifts, and cost increases.

These mistakes can be avoided through competent preparation of the TOR and early involvement of the manufacturer in project discussions.

FAQ: answers for plant engineers and managers

1. Can existing columns and beams be used as supports for new platforms?

In some cases, yes, but only after checking the load-bearing capacity of existing structures. Their cross-sections, condition, and actual loads are required for calculation. The decision is made at the design stage.

2. Which is faster: welded or bolted connections?

Welded connections speed up manufacturing but can complicate installation in tight spaces. Bolted connections are more convenient for phased assembly in an operating shop. The optimal option is chosen based on the TOR, taking installation conditions into account.

3. When does it make sense to use stainless steel?

Stainless steel is advisable in areas with frequent washing, exposure to aggressive environments, near food equipment or chemical lines. For normal dry shops, carbon steel with a quality coating is sufficient.

4. How to estimate manufacturing lead time in advance?

Lead time depends on the volume of metal, design complexity, and production workload. A guideline can be given after analyzing the TOR and a 3D layout or drawings. The more accurate the initial data, the more reliable the estimate.

5. Can the project be split into stages so as not to stop production?

Yes, process platforms and walkways are often implemented in phases: first one level or section, then subsequent ones. This is taken into account in the production and installation schedule already at the TOR calculation stage.

6. Why is laser cutting better than mechanical cutting for such structures?

Laser cutting provides more accurate geometry of parts and clean edges, which facilitates assembly and welding, reduces the risk of cumulative dimensional errors, and shortens on-site rework time.

7. Is it necessary to include a load margin in the design?

Yes, normative safety factors are always taken into account in the calculation. Additionally, it makes sense to discuss possible load increases in the future (new equipment, changes in personnel flows) so as not to have to redo platforms in a few years.

8. What is better for decking: solid plate or grating?

Grating is convenient where removal of dirt and liquids and weight reduction are important. Solid plate is preferable where continuous surfaces and protection from spillage downward are required. The choice depends on the TOR and operating conditions.

How to order calculation of metal structures based on the TOR in Tashkent

For accurate calculation and selection of manufacturing technology for load-bearing metal structures for process platforms and service walkways, it is important to start with a correct TOR.

Submit a request for calculation

To prepare an offer, please specify:

• purpose of platforms and walkways (what equipment is serviced, which areas);
• plan or layout of the shop with reference to existing structures;
• loads (number of people, equipment weight, possible trolleys, etc.);
• operating conditions (indoor/outdoor, humidity, aggressive environments);
• desired material (carbon steel / stainless steel for specific areas);
• requirements for decking, stairs, and guarding;
• limitations on element dimensions and installation conditions;
• planned project implementation deadlines.

Based on this data, it is possible to perform a calculation according to the TOR, propose an optimal structural solution, select materials and technologies (laser cutting, metal bending, welding, powder coating), and agree on realistic manufacturing and installation deadlines in the conditions of Tashkent and the regions of Uzbekistan.