Multi-Pass Heat Exchangers

At Harsha Engineers, we design and manufacture robust Multi-Pass Heat Exchangers that provide superior heat transfer efficiency for demanding industrial applications. In this design, the fluid passes through the tube bundle multiple times, allowing greater thermal contact and improved performance compared to single-pass exchangers.

Our multi-pass heat exchangers are widely used in chemical processing, petrochemicals, power generation, refineries, food and beverage, and pharmaceutical industries, where higher heat loads and precise temperature control are essential.

Manufactured using high-grade stainless steel, mild steel, and custom alloys, these exchangers are engineered to withstand high pressures, extreme temperatures, and corrosive environments. With precision fabrication, rigorous quality checks, and long service life, Harsha Engineers ensures reliable performance and reduced operational costs.

Material of Construction (MOC): MS, SS 304, SS 316, Duplex Steel, Titanium, Hastelloy.
Tube Diameter: 6 mm to 50 mm.
Tube Length: Up to 6 meters (custom-built).
Shell Diameter: 100 mm to 2000 mm.
Pass Arrangement: 2-pass, 4-pass, 6-pass, or as required.
Design Pressure: Up to 50 bar.
Design Temperature: -50°C to +400°C.
Flow Arrangement: Counter-flow, cross-flow, or mixed-flow.
Standards: ASME, TEMA, GMP-compliant.

In a multi-pass design, the tube bundle is divided using pass partitions in the tube sheet or head.
The fluid entering the tubes is redirected multiple times across the exchanger length, creating two-pass, four-pass, or even higher-pass configurations.
The shell-side fluid flows over the tubes, while the tube-side fluid makes multiple passes, improving turbulence and heat transfer.
This setup achieves greater temperature differences and higher overall efficiency compared to single-pass systems.

Multi-Pass Heat Exchangers are preferred in industries requiring high efficiency and large temperature drops, such as:

Pharmaceutical & Chemical Processing: Heating and cooling of solvents, acids, and chemical solutions.
Petrochemical & Refineries: Crude oil heating, cooling of hydrocarbon streams, energy recovery.
Food & Beverage Industry: High-efficiency heating/cooling of milk, beverages, and process fluids.
Power Plants: Boiler feedwater heating, turbine lube oil cooling, and steam condensation.
HVAC & Refrigeration: Large-scale chillers and condensers.
Marine & Offshore: High-capacity seawater and oil cooling.

Higher heat transfer efficiency compared to single-pass exchangers.
Suitable for large temperature differences and challenging duty conditions.
Greater turbulence ensures better thermal performance.
Compact design for higher capacity in smaller space.
Versatile configurations (2, 4, 6 pass) based on process needs.
Durable and long service life with robust construction.
Custom-built solutions to meet industry-specific requirements.

Conclusion

Multi-Pass Heat Exchangers from Harsha Engineers are designed for maximum efficiency, durability, and adaptability. They are an ideal choice for high-demand applications where greater heat transfer is required. With our expertise in custom fabrication, material selection, and compliance with international standards, we deliver exchangers that ensure optimum performance, reliability, and long operational life across industries.