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Wuxi Yiteng Pressure Vessel Co, Ltd.
Add：No 58, Zhenyang Road, Qingyang Town, Jiangyin, Jiangsu
Contacts：Mr. Zhang
Tel：13506192042
Fax：0510-86557866
Website：www.yitengrq.com
E-mail：wxzhangyaodong@163.com / yeekai@yitengrq.com

Multi-Pass Shell-and-Tube Heat Exchanger

Technical Specifications of Multi-Pass Shell-and-Tube Heat Exchanger

The Multi-Pass Shell-and-Tube Heat Exchanger is a high-efficiency heat exchanger that utilizes multi-pass configurations (2/4/6/8 passes) to optimize temperature difference (ΔT) and enhance heat transfer performance. It is ideal for high-flow, large temperature difference, and complex fluid applications. Below are its core technical parameters:

1. Key Technical Parameters

Parameter	Typical Value/Range	Remarks
Design Standard	ASME VIII Div.1 / TEMA BEM/AES / GB 151	Complies with international standards
Heat Transfer Area	10~2000 m²	Custom sizes available
Design Pressure (Shell/Tube Side)	0.6~15 Mpa (6~150 bar)	High-pressure models up to 30 Mpa
Design Temperature	-50°C to +600°C	Supports cryogenic to high-temperature applications
Shell Material	Carbon Steel (Q345R) / SS304 / SS316L / Nickel Alloy	Corrosion-resistant options
Tube Bundle Material	SS304 / SS316L / 2205 Duplex / Titanium	Anti-fouling design
Tube Diameter/Length	Φ10~Φ50 mm / 1~12 m	U-tube/straight tube options
Number of Tube Passes	2/4/6/8 passes	Optimizes temperature difference (ΔT)
Baffle Type	Single/Double Segmental / Disk-and-Doughnut	Controls shell-side flow
Heat Transfer Coefficient	500~3000 W/(m²·K)	Depends on pass count and fluid properties
Pressure Drop (Tube Side)	≤100 kPa	Increases with more passes
Connection Standard	ANSI / DIN / GB Flanges	DN50~DN1000

2. Structural Features

o Multi-Pass Design – Divides tube-side flow into multiple passes to extend residence time and improve ΔT.
o Anti-Vibration Optimization – Precision baffle spacing and cut ratios minimize tube vibration.
o Modular Maintenance – Removable tube bundle (floating head/AES type) for easy cleaning.
o Enhanced Heat Transfer – Optional corrugated/spiral tubes or low-fin tubes (for high-viscosity fluids).

3. Typical Applications

o Petrochemicals: Crude oil preheating (4-pass tube + single shell), cracked gas cooling
o Power Industry: Boiler feedwater heating (6-pass tube + double shell)
o Pharma/Food: High-viscosity fluids (e.g., syrups)
o Marine Engineering: Central cooling systems (multi-pass seawater side)

4. Data Required for Selection

o 1.Fluid Properties (viscosity, specific heat, corrosiveness, fouling tendency)
o 2.Flow Rate & ΔT (tube/shell side flow rates, inlet/outlet temperature difference)
o 3.Allowable Pressure Drop (tube side ≤100 kPa)
o 4.Cleaning Requirements (determines floating head/AES type selection)

5. Advantages

o High Heat Transfer Efficiency – Multi-pass design improves ΔT, 30%~50% more efficient than single-pass exchangers.
o Compact Layout – Integrates multiple passes into a single unit, reducing piping complexity.
o Flexible Configuration – Supports single/double shell passes combined with multi-tube passes (e.g., 1-2, 1-4, 2-4 types).

6. Impact of Pass Count on Performance

Pass Count	Application Scenario	Advantages	Disadvantages
2-Pass	Small ΔT (<30°C)	Low pressure drop, low cost	Lower efficiency
4-Pass	Medium ΔT (30~80°C)	Balanced efficiency & pressure drop	Slightly complex structure
6/8-Pass	Large ΔT (>80°C) or high-viscosity fluids	Highest efficiency	High pressure drop, requires more pump power

Note: Multi-pass exchangers require optimized shell-side baffle design (e.g., 25%~35% cut) to avoid flow bypass.