Shell And Tube Heat Exchanger Floating Head Type For Tail Gas Heater ASME U STAMP
Shell and Tube Heat Exchanger Floating Head Type for Tail Gas Heater ASME U STAMP
YUHONG Shell and Tube Heat Exchanger – Floating Head Type, designed and fabricated in compliance with ASME Section VIII Div. 1 and certified with the ASME U Stamp. The floating head design allows for easy disassembly, cleaning, and maintenance, making it ideal for handling tail gas heating in demanding industrial applications.
Advantages of Fixed Heat Exchangers
While this product is a floating head type, it is worth noting the advantages of fixed tube sheet heat exchangers, which are often suitable for less complex applications:
- Cost-Effective: Fixed tube sheet designs are simpler to fabricate and more economical compared to floating head types.
- Compact Design: They require less space, making them ideal for installations with limited room.
- Durability: With no moving parts, fixed tube sheet exchangers are robust and offer long service life in low to moderate temperature applications.
- Leak-Free Operation: Welded tube bundles eliminate external leakage risks.
Production Process
The production of the Shell and Tube Heat Exchanger Floating Head Type involves the following key steps:
| Step | Description |
|---|---|
| Design | Custom design is created using advanced software (e.g., HTRI, PV Elite) to meet ASME and client requirements. |
| Material Cutting | High-precision cutting of raw materials (shell plates, tubes, tube sheets) using CNC plasma or laser cutting machines. |
| Shell Rolling | Shell plates are rolled into cylindrical shapes using hydraulic rolling machines and welded longitudinally. |
| Tube Sheet Fabrication | Tube sheets are drilled with high precision to align with the tube arrangement and center distances. |
| Tube Insertion | Heat exchange tubes are inserted into the tube sheets according to the specified arrangement. |
| Tube Expansion | Tubes are expanded into the tube sheets using mechanical or hydraulic tube expansion tools to ensure a leak-free seal. |
| Head Assembly | Floating heads and stationary heads are fabricated and assembled, ensuring alignment with the shell and tube bundle. |
| Sandblasting | All components are sandblasted to remove surface contaminants and prepare for coating or painting. |
| Welding | Critical welds (e.g., head-to-shell, nozzle connections) are completed by qualified welders following ASME standards. |
| Testing | Hydrostatic, pneumatic, and nondestructive testing (NDT) ensure the exchanger meets pressure and quality requirements. |
| Final Assembly | Components are assembled, and final inspections are carried out before delivery. |
Tube Arrangement and Tolerances
The tube arrangement and center distance tolerances are critical to the heat exchanger's performance.
| Parameter | Details |
|---|---|
| Tube Arrangement | Common layouts include triangular (30°) and square (90°) for optimal heat transfer and flow. |
| Tube Pitch (Center Distance) | Typically 1.25x the tube outer diameter (OD) to ensure proper fluid flow and mechanical strength. |
| Tolerances | Tube-to-tube spacing tolerance: ±0.5 mm. Tube sheet drilling tolerance: ±0.2 mm. |
Heat Exchanger Functions
The Shell and Tube Heat Exchanger Floating Head Type for Tail Gas Heater is designed to:
- Transfer Heat: Efficiently exchanges heat between two fluids (e.g., tail gas and heating medium) without mixing them.
- Handle Thermal Expansion: The floating head design accommodates thermal expansion of the tube bundle, preventing thermal stress.
- Facilitate Maintenance: The floating head allows for easy removal of the tube bundle for cleaning and inspection, ensuring long-term efficiency.
- Operate in High Stress Conditions: Designed to withstand high pressures and temperatures, making it suitable for tail gas heating in refineries and chemical plants.
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