Why Choose a TEMA AHS Heat Exchanger for Low-Pressure-Drop Services?

Choosing the wrong TEMA type for a high-flow, low-pressure-drop service can lead to undersized nozzles, fouling problems, and even unplanned shutdowns. The TEMA AHS configuration — a double split flow shell with a floating head — is a professional solution engineered for exactly these demanding conditions. This guide explains what AHS means, where it excels, and how to specify it correctly for your project.

How to Read TEMA Type Designations

Every TEMA heat exchanger type is described by three letters: front head type – shell type – rear head type. For TEMA AHS:

Why the Double Split Flow Shell (H) Matters

In an H-type shell, the process fluid enters at the center of the shell and splits into two parallel streams flowing toward both ends, or reverses this pattern with two inlets and a central outlet. Dividing the flow into two paths halves the effective flow velocity per pass, which dramatically reduces shell-side pressure drop while maintaining high heat transfer. This makes the AHS configuration ideal for:

• Large gas volumes – natural gas, air, and vapor cooling services
• Steam condensation with high vapor loads and limited allowable pressure loss
• Vacuum services where pressure drop directly penalizes process economics
• Low-viscosity liquids requiring high throughput with minimal pumping cost

The Floating Head (S): Thermal Expansion Solved

The floating rear head allows the tube bundle to expand and contract freely within the shell, eliminating thermal stresses caused by large temperature differences between shell and tubes. Combined with the removable channel cover (A), the complete bundle can be pulled out for mechanical cleaning — a decisive advantage for fouling services. For refinery and chemical applications, YUHONG supplies complete ASME-certificated floating head shell and tube heat exchangers with full material traceability.

AHS vs. Common Alternatives

Specification Checklist for Your Inquiry

To receive an accurate quotation for a TEMA AHS exchanger, prepare the following data — our engineers will confirm the design within 24 hours:

• Process fluids, flow rates, and inlet/outlet temperatures
• Allowable pressure drop on both shell and tube sides
• Design code and class (ASME VIII, TEMA Class R/C/B, API 660)
• Materials of construction and fouling factors
• Nozzle sizes, orientation, and site layout constraints

As a TEMA-certified manufacturer, YUHONG covers the full range of TEMA configurations including TEMA heat exchangers, tube bundles, tubesheets, and baffles.

Why Choose YUHONG?

• Three ASME-certified facilities (Jiangyin, Jinjiang, Yancheng) covering 184,000 m²
• 730 skilled workers with an annual production capacity of 3,600+ units
• 3,000+ customers served across 80+ markets since 1990
• 80–90% export share with full code compliance (ASME, TEMA, API 660/661/663)