Heavy-duty refers to shell-and-tube units rated for operating pressures above 150 bar and thermal loads exceeding 10 MW, with tube wall thickness calculated per ASME Section VIII Div. 2. Standard units do not include exotic alloy cladding unless specified in the purchase order.

Yes. All thermal rejection capacities are quoted at a 28°C wet-bulb design condition. If site conditions exceed this baseline, the actual approach temperature and flow rate will be recalculated using the provided psychrometric data. No performance warranty applies above 34°C wet-bulb.

We apply a minimum tube-side velocity of 1.8 m/s for cooling water and 2.2 m/s for process fluids containing suspended solids. The mass transfer coefficient is computed using the Chilton–Colburn analogy. If the client’s water chemistry exceeds 400 ppm total hardness, a chemical treatment plan must be implemented separately.

Foundation design, piping spools beyond the first flange, insulation cladding, and third-party NDE witness fees are not included. Any deviation from the approved isometric drawing requires a change order and may affect the delivery schedule.

Routine preventive maintenance is scheduled Monday–Friday 07:00–17:00. Emergency interventions outside these hours are billed at 1.5× the standard labor rate, with a minimum four‑hour charge. Response time is guaranteed within 6 hours for sites within 150 km of our workshop.

The guaranteed pressure drop applies at the design flow rate ±5% and at the specified fouling factor. If the client operates outside these parameters, the guarantee is void. A performance test can be conducted at the client’s cost to verify compliance.