By Vvon Engineering Team | Published | Updated
Assess pharmaceutical utility demand, roof work, QA change control and safe generator integration before designing PV.
Solar EPC & street lighting RFQ checklist (TXT)
A formulation plant's quality head will stop a rooftop solar project faster than its finance director will. Not because the numbers are wrong, but because somebody has proposed drilling through the deck above a Grade D corridor and nobody has written a change control for it. That conversation goes far better when it happens before the design is fixed.
A pharmaceutical site may offer useful daytime electrical demand, but roof works, contamination control and approved operating procedures can determine whether a proposal is practical.
HVAC and other utilities can provide recurring demand. Their operating hours depend on the product, facility, validated state and approved procedures; not every classified-area AHU must run continuously under all conditions.
Log AHUs, chillers, pumps, dehumidification, compressed air, water systems and production loads across operating modes. Include shutdowns and any approved setback periods.
Use the measured profile to estimate self-consumption and exported energy. A pharmaceutical designation alone does not establish negligible export or financial return.
Roof work can affect the building envelope, classified areas or qualified utilities. QA should assess the proposed change against the facility's pharmaceutical quality system and define the required controls.
Involve QA before fixing the design. Identify affected areas, contamination and environmental-control risks, work restrictions, required verification and release responsibilities through the site's change-control process.
Compare alternative roofs and routes to reduce interference with controlled areas. Warehouse and utility buildings still need structural, fire, process and environmental assessment.
Non-penetrating mounting still changes load, drainage, maintenance and roof access. It does not remove the need for structural review or the site's change assessment.
Survey usable roof area around AHUs, ductwork, stacks and access routes. Do not infer usable capacity from the production block's footprint.
Assess exhaust plumes for deposition, corrosion, contamination and any hazardous-area implications. Establish equipment separation and cleaning requirements with the process and safety teams.
Where generators and PV share a supply system, assess their interaction before permitting parallel operation. Unplanned reverse power or unstable operation can cause trips or damage, depending on the equipment and controls.
Specify an approved interlock or compatible generator-aware control and protection arrangement. Verify minimum loading, reserve and safe failure behaviour with the manufacturers and record it in the controlled single-line diagram.
A formulation plant is full of variable frequency drives on AHU fans and chillers, and full of instruments that do not enjoy transients: HPLC systems, environmental monitoring, the BMS and the building PLCs. Two things to specify.
The net metering application runs through the distribution utility that issued your connection, under SREDA's guidance. Pharmaceutical plants sit across a wide spread of locations, from Tongi and Gazipur to Savar, Dhamrai, Munshiganj and Narayanganj, and the utility differs with the address. BPDB, DPDC, DESCO, NESCO and BREB each run the same broad process with their own forms and their own queue. Confirm which one holds your connection before anyone starts filling in paperwork.
Then check the sanctioned load on that connection, because the net metering guidelines cap the plant against it. Large pharmaceutical sites usually have headroom and the roof binds long before the ceiling does. A plant on a leased floor, or a site whose sanctioned load was set years ago and never revised upward, can find the design capped for a reason nobody anticipated. It is a five minute check against the bill, and it saves a redesign.
The other early check is the connection point. If the site takes supply at 11 kV through its own substation, then the point of common coupling, the metering arrangement and the protection scheme all need agreeing with the utility, and that discussion runs longer than the LT equivalent. Start it while the structural survey is still going on.
A pharmaceutical engineering department already manages its chillers, its compressed air and its purified water system through a document set: specification, drawings, calibration certificates, maintenance schedule, spares. A solar plant should arrive the same way. If the EPC contractor's handover is a folder of brochures and a warranty card, ask again.
It also pays to programme the installation against the plant's shutdown calendar rather than the contractor's. Cable pulls through a production block, hot work anywhere near solvent handling and any activity that opens the envelope all need permits, and permits are issued at the plant's pace. An EPC programme that assumes continuous access to a working pharmaceutical facility is a programme that will slip.
Consult the relevant edition and the documents for the exact equipment and site: WHO: HVAC design, qualification and management for pharmaceutical facilities; SMA: PV-diesel control and minimum generator loading; SREDA: Net Metering Guidelines and current application documents; IEC 62548-1: PV array design requirements.
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