Equipment Support Structures India

Equipment support structures are the fabricated steel frames, pedestals, and platforms that carry vessels, exchangers, pumps, compressors, and packaged skids at the correct elevation and alignment for piping tie-in. Sun Corporation fabricates these structures from IS 2062 sections and plate to IS 800:2007, with shop drawings, qualified welding, and inspection records suitable for EPC and PMC approval.

Unlike general building steel, an equipment support exists to serve a specific machine. Its geometry is driven by the vendor’s footprint and nozzle orientation, its elevation by the piping route, and its stiffness by the operating and test loads the equipment imposes. A support that is structurally adequate but 20 mm out of position still causes a piping clash — which is why dimensional control matters as much as member sizing on this scope.

These structures sit inside the wider plant steel package. They share foundations and grid lines with pipe racks, share landing levels with industrial platforms, and are reached by stair towers. Related plant-level scope is covered under process plant structures.

Typical environments include refineries and chemical units, cement and steel plants, power stations, water and effluent treatment plants, and manufacturing facilities — anywhere fixed equipment must be held at a designed elevation with repeatable alignment.

What procurement teams specify

Support structures appear on structural BOQs as discrete line items — often split by equipment tag. We fabricate to the approved GA and connection design; anchor bolt templates and base plate setting plans are issued before concrete pour when we are in scope for erection support.

Structure type	Common application
Equipment pedestals and stools	Pumps, compressors, small vessels
Multi-level support frames	Stacked exchangers, column supports
Skid support frames	Structural frame only — equipment by others
Maintenance platforms	Access around valves and instruments
Load rating	Per structural design; operating + test loads

Splitting the BOQ by equipment tag helps procurement track delivery against mechanical readiness, but it also means small quantities of many different frames. Batching those tags by area or by pour sequence keeps fabrication efficient without breaking the tag-level traceability that EPC teams need for progress measurement.

Types of equipment support structures

• Pedestals and stools — short fabricated supports raising pumps, compressors, and small vessels to the required centreline, usually with a machined or shimmed bearing surface at the base plate.
• Multi-level support frames — braced frames carrying stacked exchangers or supporting columns at several elevations, with access landings where maintenance requires it.
• Skid support frames — structural frames receiving vendor-supplied packaged units; the frame is in our scope, the equipment is by others.
• Vessel and tank supports — saddles, legs, or ring supports fabricated to the vessel drawing and load case shown on the structural design.
• Maintenance platforms attached to supports — local decks giving access around valves, instruments, and removable equipment items.

Structural components

• Columns and legs — rolled or built-up members carrying vertical load to foundations.
• Primary and secondary beams — members supporting equipment base frames, distributing load to columns.
• Base plates and anchor bolt templates — shop-drilled to the approved pattern; templates issued before pour where we support erection.
• Bracing — vertical and plan bracing that controls sway and keeps alignment under operating and test conditions.
• Stiffeners and gussets — local reinforcement at high-load connections and equipment bearing points.
• Connection plates and match marks — bolted interfaces detailed for shop fit-up and repeatable field assembly.
• Grating, chequered plate, and handrails — where maintenance access is part of the support scope.

Materials

Fabrication uses IS 2062 sections and plate as specified on the drawings, with grades and section sizes as designed. Base plates, stiffeners, and gussets are cut from plate to the shop drawing. Access steel — grating, chequered plate, and handrails — follows the project standard where included in scope.

Grades are not substituted without an approved concession. Mill test certificates are traceable to cutting lists and form part of the quality dossier issued for EPC and PMC review.

Plate thickness at base plates and bearing points is taken from the design rather than standardised across tags, because a pedestal carrying a compressor and a stool carrying a small pump have very different local bearing demands. Where the drawings call for machined or ground bearing surfaces, that requirement is carried through the shop route sheet so it is not lost between cutting and dispatch.

Design and alignment considerations

Design inputs come from two directions: the structural drawings define member sizes, bracing, and foundation interface; the mechanical and piping documents define equipment weight, footprint, nozzle loads, and required elevation. Operating loads and test loads — including hydrotest where applicable — must both be covered by the design case shown on the drawings.

Deflection and stiffness matter more here than on general framing. Rotating equipment is sensitive to support flexibility, and excessive movement at a support can shift alignment or transmit vibration into connected piping. Thermal movement of the equipment and connected lines must be allowed for at sliding or guided supports where the design calls for them.

Maintenance access should be settled at design stage rather than added later. Pull space for exchanger bundles, clearance for pump removal, and room to swing a valve handle all change frame geometry. Adding a landing after the frame is fabricated usually means field welding onto a coated member, which costs more and creates a coating repair.

Foundation interface is the other recurring source of rework. Base plate size, anchor bolt projection, grout thickness, and levelling method should be consistent between the structural drawing, the setting plan, and what civil actually builds. Where equipment vendors issue late footprint revisions, the affected frames need re-checking before cutting rather than after fabrication.

Alignment and erection

Equipment supports fail in the field when base plate elevation or bolt pattern is wrong. We pre-assemble in the shop where practical, match-mark connections, and survey plumb and level during erection to IS 800 Annex G tolerances. Related plant-level scope is covered under process plant steel.

Shop pre-assembly is the cheapest place to find an interface error. Where transport and lift weights allow, frames are trial-fitted and match-marked before dispatch so the site crew is bolting known-good geometry rather than correcting it at height. Setting plans issued to civil keep anchor bolt projection and grout thickness within the range the base plate detail assumes.

Fabrication process

1. Engineering review — GA, connection design, equipment loads, and interface hold points checked before shop drawings are released.
2. Material procurement — IS 2062 sections and plate booked against cutting lists with mill certificates.
3. Cutting and drilling — members and connection plates processed to shop drawing dimensions.
4. Fit-up — frames assembled and checked for square, level, and hole pattern before welding.
5. Welding — coded joints to qualified WPS/PQR (IS 9595) by qualified welders.
6. Inspection — dimensional, visual weld, and NDT per the project ITP.
7. Surface preparation and coating — blast, primer, and finish system or galvanising per project specification.
8. Marking and dispatch — piece marks by equipment tag and erection sequence.

Quality control

Inspection follows the project ITP. Typical activities include fit-up inspection before welding, dimensional inspection of base plate patterns and overall frame geometry, visual weld inspection, and in-house Level II UT/MPI where the ITP requires it. Customer and third-party inspection are accommodated when specified in the contract.

Because these frames are tag-specific, dimensional records are checked against the equipment drawing as well as the structural drawing before coating. Documentation — mill certificates, WPS/PQR records, NDT reports, and coating records — is compiled for EPC and PMC review.

Applications

• Refineries and chemical plants — exchanger stacks, column supports, pump and compressor pedestals
• Cement plants — fan, mill auxiliary, and material-handling equipment supports
• Steel plants — process equipment, hydraulic units, and auxiliary system frames
• Power plants — BOP pumps, exchangers, and packaged skid frames
• Water and effluent treatment — pump, blower, and dosing skid supports
• Manufacturing plants — machine bases, elevated equipment frames, and access steel

Integration with other fabricated structures

Equipment supports rarely arrive alone. They share grid lines and foundations with pipe rack bents, meet industrial platform decks at maintenance elevations, and are accessed by access stair towers. Along conveying routes they interface with conveyor gallery structures. Fabricating them in the same batch as the adjoining package keeps hole patterns and elevations consistent.

For full fabrication capability see structural steel fabrication and heavy steel fabrication.

Information required for quotation

• GA drawings or IFC structural drawings showing support geometry and connections
• Equipment list with tags, weights, footprints, and required elevations
• Design loads including operating and test conditions
• Anchor bolt and foundation interface details, if available
• Finish specification — paint system or galvanising
• Whether access steel (platforms, grating, handrails) is in scope
• Site location and preferred dispatch or erection sequence

Related fabricated scope

Equipment frames sit next to fabricated process structures, steel pipe rack systems, and overhead pipe bridges. Access packages add maintenance platforms and stair tower steel; refining units often pull refinery structural packages; utility corridors use utility corridor racks.

Equipment Support Structures India — Enquiry

Fabrication is carried out at our Jeedimetla, Hyderabad workshop under IS 800:2007 with IS 2062 material, qualified WPS/PQR to IS 9595, and in-house Level II UT/MPI. For EPC prequalification packs, see our manufacturer credentials. For full fabrication scope, see structural steel workshop scope and heavy fabrication.

Send GA drawings, piping layouts, or a scope note for RFQ: Contact Sun Corporation — preliminary response within 24 hours on working days; detailed quotation within 48–72 hours when IFC or enquiry drawings are available.