Mumbai raises the specification, and the building pushes back
Mumbai carries one of the deepest interventional cardiology markets in India — several high-volume catheterisation programmes, a dedicated cardiac hospital layer, and public teaching hospitals absorbing much of the emergency coronary load. A hospital adding a lab here enters a market where referrers already know what a good lab looks like.
The predictable effect is upward pressure on specification. Biplane, hard to justify in a smaller city, is genuinely defensible in Mumbai centres doing neurointervention, paediatric and congenital work or complex structural heart cases, because that case mix exists here in volume. So are hybrid rooms for TAVI, EVAR and TEVAR. The honest position is unchanged: single-plane covers the overwhelming majority of adult coronary work, and biplane is argued from a documented case mix, not from what the hospital two kilometres away installed. Nor is it only an imaging line: biplane and hybrid rooms need more barrier area, a bigger technical room, more power and more cooling, all of which cost more here than anywhere else in Maharashtra.
The building decides whether the room is possible
Almost no cath lab here is built on an open site, so the survey is mostly a structural investigation.
Slab-to-slab height is the first gate. A ceiling-mounted gantry wants 3.4-3.6 m slab to slab so the finished ceiling sits near 2.9-3.0 m under the rails; much of the Mumbai hospital estate was built at 3.0-3.3 m. Below about 3.2 m the ceiling gantry is out, and the floor-mounted fallback changes OEM selection, sweep clearance and the anaesthesia position.
Floor loading is the second. Gantry, table plinth and the steel grid carrying monitors, shields and pendants concentrate the OEM point loads into a handful of anchors rather than spreading them, so slabs designed around 3-4 kN/m² live load need checking against that schedule specifically; the usual answer is a steel transfer frame spanning to beams. Cabling to the gantry needs a trench, or a raised floor that consumes height you were already short of.
Getting the equipment in is a genuine logistics exercise. Panels knock down; a gantry stand does not. Lift car dimensions and capacity, staircase turning radius and door clear widths are measured at survey, and where they fail the options are crane hoisting under traffic police permission in a night window, or forming a temporary structural opening in an external wall and closing it afterwards. Both carry approvals and belong in the programme from week one.
Shielding in a building where everything is occupied
Shielding design precedes civil work everywhere. In Mumbai it also tends to produce thicker barriers, and the reason is occupancy.
Lead equivalence is calculated barrier by barrier from workload, operating potential, distance, the occupancy factor of the space beyond and the shielding design goal for it. In a freestanding block flanked by plant rooms and lightly used corridors, several barriers are defensible at the lower end of the usual 1.5-2 mm Pb band. A lab inserted into a live floor plate rarely has that luxury: ward on one side, waiting area on another, consulting rooms above and day-care below is a six-sided problem in which nearly every neighbour is a fully occupied uncontrolled area at short distance. Barriers then sit at the top of the band, occasionally 2.5-3 mm Pb, with door and lead glass specifications rising alongside, so an identical clinical room can differ materially between two floors of the same hospital. Floor and ceiling barriers matter here too, and where a floor above is leased or the building shared, that occupancy assumption is the hospital’s to justify.
The AERB pathway, described honestly
AERB regulates the room as a radiation installation and revises its processes periodically, so what follows is the shape of the pathway; confirm current requirements, forms and fees on eLORA at the time of submission.
Typically the hospital registers as an institution on eLORA, then submits the room layout with barrier-by-barrier shielding details for layout approval before construction begins. The imaging model and supplier generally need to sit within AERB type approval, and the facility nominates a Radiological Safety Officer — certification runs on fixed examination cycles, so it starts earliest and finishes last. After OEM installation and acceptance testing, QA testing and a radiation survey at every barrier, door edge, window frame and console position support the licence application.
The licence is issued to the hospital, not the contractor, and nobody can honestly promise an approval. What we own is everything AERB reads: layout drawing, shielding calculations, adjoining-occupancy mapping, and coordination of QA and survey. In Mumbai that occupancy mapping attracts the most queries, because dense buildings have complicated neighbours. Budget three to six months of regulatory lead time, concurrent with construction.
Coastal air and two separate HVAC problems
The procedure room needs 21-24°C at 40-60% RH with HEPA-filtered positive pressure, and a Mumbai summer design wet bulb of 27-28°C makes that a latent-load problem: deeper coil, lower chilled water temperature, reheat downstream, fresh air pre-treated in its own dehumidification stage. Humidity is not comfort here — low RH raises static discharge risk around sensitive electronics, high RH risks condensation inside expensive equipment. Near the coast, coil fins get coated and terrace plant moves to marine-grade casing.
The technical room is a different problem: 5-15 kW rejected continuously whether or not a case is running, inside a narrow band commonly 18-25°C, with a hard limit at which the system throttles or shuts down. It needs dedicated redundant cooling on essential power, not a spare split. And because the shielded envelope is close to airtight, every duct crossing a lead barrier needs a baffled penetration drawn on the shielding layout rather than improvised on site.
Programme, statutory notes and delivery from Pune
A single-plane lab inside an existing shell runs 16-24 weeks from order to clinical handover; a Mumbai retrofit in a live hospital adds two to six weeks for phasing, containment agreed with infection control, and noise windows, since hospital precincts are silence zones and core cutting is confined to daytime hours while material moves at night. Biplane and hybrid projects run 26-36 weeks. Long-lead imaging delivery, where it exceeds these windows, governs everything — which is why the purchase order and the AERB layout submission belong in the same month.
Beyond AERB, any change to built form routes through the MCGM building proposal process, and a fire NOC is required under the Maharashtra Fire Prevention and Life Safety Measures Act because a new interventional suite alters compartmentation and fire load. Facility registration sits with the civic public health department, and hospitals claiming cardiac packages under MJPJAY or PM-JAY must evidence supporting infrastructure.
Mumbai is about 150 km from Pune — a same-day survey city and a next-day escalation city. Design and the regulatory package are produced in Pune, specialist trades travel, general civil labour is engaged locally. Pune is our only office, and we say so.
Full technical specification
Barrier calculation method, room sizing, power and UPS detail and the full AERB sequence are set out on the parent cath lab setup service page. This page covers what changes in Mumbai.