Heavy Lifting & Rigging

Rigging is the engineering discipline of lifting and moving loads that cannot be handled by conventional means — either because of their weight, their dimensions, their value, or the constraints of the space they occupy. In an Indian industrial context, that means press tools weighing 80 tonnes in a Chennai automotive plant, a transformer unit being installed at a Gujarat substation, a heat exchanger being threaded through a refinery structure in Jamnagar, or a CNC machining centre being repositioned within a Pune precision engineering facility. Seemleius heavy lifting and rigging plans and executes these jobs safely.

Why rigging requires engineering, not improvisation

The gap between a rigging job that runs safely and one that does not is almost always in the planning stage. Lifting points need to be rated for the load; rigging angles affect the force on each sling; ground bearing pressure matters when jacks or crane outriggers are involved; and the path the load travels through the building has to be cleared and checked before the lift begins. We do all of this before any equipment is moved into position.

Equipment and techniques we use

Common lifting assignments

• Transformer installation and replacement at substations and industrial sites
• Press, forge and stamping machine installation in automotive and metal fabrication facilities
• Reactor vessel, heat exchanger and column placement in process plant
• Generator and large motor installation in power and infrastructure projects
• Repositioning and re-levelling of CNC and precision machine tools

How a heavy lift runs

1. Load survey. We gather the load’s weight, dimensions and centre of gravity, inspect the lifting points, and assess the site — access, headroom, floor loading and crane setup area.
2. Lift plan. A lift plan documents the method, equipment selection, sling configuration, rigging sequence and responsibilities. For complex lifts, a structural engineer reviews the ground-bearing and attachment calculations.
3. Equipment mobilisation. Crane, gantry or skate equipment is mobilised to site. A pre-lift safety check is completed before the load is touched.
4. Execute and position. The lift proceeds to the approved plan. The load is placed precisely at the destination, levelled where required, and handed over to your commissioning team.

Heavy lifting and rigging supports our broader machinery moving service and is available as a standalone capability when you need a lift completed as part of your own project. Tell us about the load and we will scope the rigging.

The lifting study comes first

Every engineered lift begins as a document, and the quality of that document predicts the quality of the lift. A lifting study starts from verified load data — not the nameplate figure alone, which routinely omits attachments, residual oil and retrofitted ancillaries, but a confirmed gross weight with the centre of gravity established from drawings or a test lift. From there the study fixes the geometry: sling angles and the resulting tension in each leg, spreader beam requirements where attachment points sit wide, headroom available against headroom needed, and the swing path the suspended load will trace through a working building.

Ground comes next, because most crane incidents are ground incidents. Outrigger loads are calculated and compared against what the surface can actually bear — a made-up hardstanding over an old drain duct behaves very differently from the compacted apron it resembles — and steel mats are specified where the numbers demand them. Inside a plant, the same discipline applies to floor slabs: a gantry leg or a loaded skate imposes point loads a slab may never have been designed for, and the study says so before the machine finds out. Finally the study allocates people — one appointed person directs the lift, and nobody else gives instructions while a load is in the air. Where a client site runs a permit-to-work system, the lift proceeds under that system and its isolations, as it should.

When the load is bigger than the road

A significant share of heavy-lift work ends with a road movement, and Indian road rules draw a hard envelope around a standard vehicle: loads beyond roughly 2.6 metres of width or 3.8 metres of travelling height, or beyond the permissible axle weights, fall into over-dimensional cargo territory. ODC movement in India is a regulated activity — each state’s transport authority issues movement permissions for its stretch of the route, and a multi-state journey means multiple approvals that must line up in sequence.

The practical craft sits underneath the paperwork. Before a transformer or press bed travels, the route is driven and measured: bridge capacities checked against axle loading, underpass heights against the loaded height, toll plaza widths, the turning radii at flyover ramps, and the overhead electrical crossings that decide whether a line-shutdown request is needed for a tall load. Hydraulic modular axle trailers spread extreme weights across dozens of tyres and steer each axle line independently — which is how a 120-tonne stator turns through a junction designed for buses. Escort vehicles ride ahead and behind, and the heaviest movements travel at night when the highway is emptiest. We plan the road leg with the same rigour as the lift itself, because a load delivered to the wrong side of a weak bridge has not been delivered at all.

Matching method to the load

There is no single right tool in rigging — there is a right tool for a given weight, geometry and space. The bands below describe how assignments commonly resolve; the lifting study makes the final call.

The interesting problems rarely come from raw weight. A 6-tonne machining centre with its mass biased hard to one end, entering a basement through a stairwell void with 40 millimetres of clearance, is a harder assignment than a 60-tonne vessel in an open yard. Weight determines the equipment; geometry determines the difficulty.

An assignment, end to end

To make the sequence concrete, take a composite of jobs we see often: a 65-tonne power transformer to be replaced at a live substation, the old unit out and the new one in, with the switchyard de-energised for a fixed forty-eight-hour outage. The work backwards from that outage looks like this. Weeks earlier, the site survey establishes crane standing positions clear of live equipment, the gate the trailer can actually enter, and the plinth details for both units. The lifting study is issued and reviewed with the utility’s engineers; the crane is sized with margin because substation lifts allow no repositioning mid-job. Route work runs in parallel — the new transformer is an over-dimensional load, and the movement approvals, the bridge checks and the night-movement escorts are arranged so the unit arrives and sits staged on its trailer near site days before the outage opens.

Then the outage clock starts. Isolation is confirmed and documented. The old unit is disconnected, jacked, skidded onto the trailer and removed. The plinth is prepared, the replacement is skidded on, positioned to millimetre marks, and handed to the utility’s team for connection — with more than a day of the window still unspent, because the plan carried slack and the slack was not needed. Nothing about that job is exotic; every element appeared earlier on this page. The craft is in making them line up.

Safety is procedural, not aspirational

On a rigging site, safety lives in specific, checkable things. Every sling, shackle and spreader carries a current test certificate and an identification mark, and tackle without both stays on the truck. The lift plan names its abort criteria in advance — wind speed limits for outdoor crane work, a maximum out-of-level for jacking operations, load-indicator thresholds — so the decision to stop is made on paper before it ever has to be made under pressure. The toolbox talk before the lift walks every crew member through the sequence, the exclusion zone and the single-controller rule; anyone on site can call a stop, and a called stop is never argued with while the load is off the ground.

Clients sometimes ask why a two-hour lift needs two days of preparation. The honest answer is that the preparation is the job. The lift itself is the shortest and least dramatic part of a rigging assignment done properly — and that is precisely the outcome the preparation buys.

What to have ready when you enquire

A rigging enquiry moves fastest when the first conversation already contains the load’s essentials. The general arrangement drawing or datasheet, if it exists — even a manufacturer’s brochure page beats a guess. The best available weight, and whether that figure is verified or nameplate. Photographs of the load where it stands today, including its surroundings; a phone picture showing the roof truss above a machine answers headroom questions no email can. The destination position, and the dates the operation must fit inside — a shutdown, an outage, a civil-works milestone. Where drawings are long lost, as they often are with older plant, say so plainly: establishing weight and centre of gravity from scratch is normal engineering work, and it is far better priced into the plan than discovered at the hook.

From that starting point the path is short: a site visit, a lifting study, a fixed scope and a date.

How a rigging quotation is built

People who have only hired a crane before are sometimes surprised by the shape of a rigging quotation, because the crane is a minority of it. It starts with engineering hours — the site visit, the lifting study, the drawings and the review cycle with your engineers — and those are real work whether or not the lift goes ahead. Then mobilisation: a crane of the right capacity has its own journey to your site, and a crawler crane arrives in pieces on several trailers and is assembled on your ground. Ground preparation follows — steel mats, timber cribbing, occasionally a temporary hardstanding — sized from the outrigger calculations. Tackle is itemised: spreader beams, slings and shackles rated for this load and certified. Crew and supervision are priced by the day with a named lift supervisor, and where the load goes on to the road, the route survey, the over-dimensional movement approvals and the escort vehicles appear as lines of their own.

The line most worth reading is standby. A lift booked inside a shutdown or an outage carries the risk that the window slips for reasons on the client’s side — the isolation is late, the civil works are wet, the old unit will not come free — and a crane and crew held on site cost money by the hour. A good quotation says plainly what standby costs and when it starts, so nobody is negotiating it with a load on the hook.

Straight answers to common questions

Do you hire out cranes on their own?

No — and the distinction matters. Plant-hire companies rent you a crane and an operator; the lift plan, the rigging and the responsibility stay with you. What we deliver is the engineered operation: study, equipment, tackle, crew, supervision and the outcome. On jobs where a client’s own contractor needs a heavy lift executed inside a larger project, that is precisely the shape of the engagement — one defined lift, delivered complete.

How much lead time does a lift need?

A routine machine lift with good access can be surveyed, planned and executed inside a fortnight. Add over-dimensional road movement and the multi-state approvals that come with it, and six to eight weeks is a healthier runway. The long pole is rarely the crane — it is the sequence of route clearances, and those follow the calendar of authorities, not of contractors.

Can a heavy lift happen while the plant keeps running?

Frequently, yes — with conditions. The exclusion zone is absolute for the duration of the lift, which may mean an aisle, a bay or a yard is closed for hours even though the rest of the site works normally. Night and weekend slots exist for exactly this reason, and lifts adjacent to live electrical equipment or process lines carry additional isolations agreed with your safety team in advance. What never happens is a lift threaded between forklifts and pedestrians to save a production hour; the arithmetic of that trade has only one losing side.

Does the monsoon stop heavy-lift work?

It complicates it rather than stops it. Wind limits bite harder on outdoor crane work between June and September, saturated ground changes the mat calculations, and a yard that was firm in April is not firm in July. Lifts inside buildings carry on regardless. Where a lift can be scheduled into the dry months it is easier and usually cheaper; where it cannot, the study plans for the season instead of hoping about it.

If your project has a load that needs to move — up, down, sideways or across three states — put the drawings in front of us and the study can start.