Galvanized gantries and equipment supports made to utility drawings
Substation columns, crossmembers, bracing and equipment frames are fabricated around the specified equipment and connection layout. Base plates, mounting holes and attached supports follow the approved drawings, with steel and hardware grouped by structure.
| Package item | Steelwork supplied | Interface controlling fabrication |
|---|---|---|
| Gantry frames | Columns, crossmembers and brace connections | Frame arrangement, member lengths and field joints |
| Bus support steel | Posts, crossmembers and attachment plates | Insulator mounting positions and support elevations |
| Equipment support frames | Fabricated stands and mounting steel | Equipment base pattern, orientation and attachment detail |
| Base connections | Base plates and welded stiffeners | Anchor-hole layout and foundation datum |
| Bracing and ties | Angles, tubular braces and connection plates | Brace positions, member ends and joint details |
| Connection hardware | Bolts, nuts and washers listed in the package | Grade, diameter, length, finish and assembly count |
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Electrical apparatus, insulators, grounding conductors and foundation work remain separate from this steelwork package. Anchor rods and equipment mounting bolts have their own supply lines, so their quantities are visible alongside the structural connection hardware.
An equipment support has two sets of interfaces: its foundation base and the face carrying the equipment. The OEM mounting pattern sets the top-plate hole centers, slot direction and available bolt access. Support height is measured to the defined mounting surface so the equipment arrives at its required elevation.
Crossmember position, brace placement and the station grid establish the steel arrangement. Electrical clearance envelopes and equipment operating space come from the approved station design. We carry those interfaces into the fabricated steel without treating a voltage class as a universal support size.
Find an equipment, base or connection dimension.
| Interface | Dimension / unit | Fabrication detail |
|---|---|---|
| Support elevation | Mounting-face height; in. or mm | Datum and installed equipment orientation |
| Equipment attachment | Hole centers and plate size; in. or mm | OEM base drawing and required bolt access |
| Structure grid | Column centers and crossmember span; ft or mm | Structure ID and station arrangement |
| Base plate | Plate thickness and anchor grid; in. or mm | Foundation template and column centerline |
| Field joint | Hole diameter, pitch and edge distance; in. or mm | Connection detail and specified bolt assembly |
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The project engineer establishes structural loads, deflection criteria and electrical clearances. Fabrication follows the released steel and equipment interface drawings, with any changed hole pattern or mounting elevation recorded in the approved revision.
Columns, crossmembers, braces and attached plates keep their individual material specifications in the bill of materials. A rolled shape, structural tube and fabricated plate use different product standards. The exact section designation stays with each member; a metric H section does not replace a US W section solely because their depths appear similar.
| Plate grade | Reference thickness (in.) | Minimum yield (ksi) | Tensile strength (ksi) |
|---|---|---|---|
| ASTM A36 | 0.100–6.00 | 36 | 58–80 |
| ASTM A572 Grade 50 | 0.100–4.00 | 50 | 65 minimum |
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Plate grade and thickness identify the base material. Structure capacity comes from the approved member, connection and foundation design; it is not the plate’s yield strength expressed as a support rating.
Hot-dip galvanizing is applied after the approved cutting, drilling and welding work. The zinc acceptance basis follows the material category and measured steel thickness. Rolled shapes, plate and tubular members in the same assembly can therefore carry different minimum average coating requirements.
| Material category | Measured steel thickness (mm) | Minimum average zinc (µm) |
|---|---|---|
| Structural shapes | 8 | 100 |
| Plate | 8 | 75 |
| Pipe and tubing | 8 | 75 |
| Structural shapes | 20 | 100 |
| Plate | 20 | 100 |
| Pipe and tubing | 20 | 75 |
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These values set the coating reference for the listed category and thickness. The inspection record identifies the actual components, measurement areas and acceptance basis. Fabricated columns formed from plate retain the plate category; their finished shape alone does not make them manufactured pipe or tubing.
Connection and equipment holes are prepared to the released detail before the galvanized finish is applied. Hole pattern, member orientation and access for a nut or wrench belong to the same joint. This gives the installer a defined connection instead of a plate that must be redrilled to suit the equipment.
Closed sections and attached plates need a venting and drainage arrangement that allows cleaning liquids and molten zinc to move through the assembly. Round, square and rectangular hollow members use details suited to their geometry. The approved openings are included in fabrication before the steel reaches the galvanizing stage.
The connection drawing sets the required bolt access, grip length and washer arrangement. Hole clearance and finished contact faces are checked with the specified hardware, including the coating allowed at that joint.
A new bay combines gantry and equipment support sets at their station-grid positions. Structure IDs tie each steel assembly to its equipment interface and foundation reference. The package schedule keeps repeated support types together while identifying any distinct mounting detail.
Replacement equipment can change the mounting footprint or the elevation at its terminals. The revised support detail establishes which steel members remain and which plates or frames are replaced. Matching only the previous equipment type can miss those interface changes.
Renewable-energy and industrial grid connections require the same coordination between utility steel, equipment and civil works. Our supply covers the fabricated structural package; the project’s electrical and foundation designs establish the final interfaces and acceptance requirements.
Support height, plate position and hole centers are checked from the drawing datums. The equipment-mounting face and the foundation base are recorded separately. This checks the interfaces that have to match at installation, in addition to the member’s overall length.
Weld size, joint type and examination scope follow the fabrication specification. AWS D1.1 provides the structural-steel welding framework when the project requires it. The order’s inspection plan identifies the applicable procedures, acceptance criteria and required records.
Coating checks follow the component category and thickness specified for the order. Connection areas are also checked for zinc buildup, blocked holes and handling damage that could interfere with assembly. Approved repair work retains its own location and record.
Structure and shipping-piece marks link the supplied steel to its material identity, drawing revision and inspection records. The same marks appear on the packing schedule.
Substation prices itemize the structure sets, fabricated members, plates and included hardware. Finish, inspection documents, packing and freight are listed with the production and delivery terms.
Hardware is boxed by connection group and structure mark, with bolt, nut and washer counts listed by size and grade. Any spare erection sets have their own counted line, so the site team can reconcile the cartons against the assembly schedule.
Columns and crossmembers travel on supported stacks, with contact protection at straps and attached plates. Spacers allow water to drain and air to move between zinc-coated pieces. Packing groups follow the bay or structure sequence, with piece counts matched to the dispatch list.
Yes. The utility standard drawing, its current revision and the required structure quantities form the quotation basis. Project-specific equipment interfaces and any approved changes remain attached to that structure schedule.
A plate-only quotation identifies the support mark, plate drawing and quantity. Hole pattern, thickness and attachment detail follow the approved replacement drawing. Existing frame members remain outside that order unless separately listed.
A preliminary layout and equipment support list can start a budget quote. The offer states its drawing basis and included steelwork. Fabrication starts from the approved member, connection and mounting details.
The project’s licensed engineer provides the required US design stamps, and the utility’s procurement process establishes vendor qualification. Our supply agreement identifies the fabricated steel and the documentation included in the package. The approved engineering and utility requirements form the order’s acceptance basis.
Fabricated holes, vents and drains follow the approved fabrication and galvanizing details. Connection areas are checked for blocked holes and zinc buildup so the finished parts remain usable for assembly.
Share the structure schedule or station layout with quantities and the delivery destination. Equipment mounting drawings and base details identify the interfaces. We quote the fabricated steel, listed hardware, finish, inspection records and shipment terms against the stated drawing revision.