This case study focuses on identifying the most effective post-weld heat treatment (PWHT) in pressure vessel fabrication.
The objective is to move beyond traditional methods by adopting a more efficient solution that delivers consistent high temperatures, enhances the structural integrity of the pressure vessels, and minimizes thermal loss.
This study seeks to find an optimal approach for modern pressure vessel fabrication, particularly in high-temperature applications
The client needed to perform post-weld heat treatment (PWHT) on pressure vessels with weld nodes at temperatures exceeding 2000°F.
The primary challenges included:
To effectively perform PWHT on pressure vessels with weld nodes at temperatures above 2000°F, our team suggested the following solutions:
This solution provided a consistent and effective PWHT process, addressing all key challenges and meeting the client’s high-temperature needs.
The optimized PWHT process for pressure vessel fabrication effectively tackled all challenges:
Temperature Achievement: Kanthal “D” wire sustained 2000°F for proper weld node treatment.
Insulation Efficiency: CooperKnit insulation and ceramic pads ensured consistent temperature distribution at high temperatures by minimizing heat loss
Material Compatibility: Insulation suited Grade 347H stainless steel, supporting high-temperature strength and corrosion resistance.
Structural Integrity: Insulation preserved vessel integrity during and post-heat treatment.
Controlled Ramp Rate: The process maintained a 260-300°F per hour ramp rate, preventing material damage.
Product Limitations: Kanthal wire replaced standard Ni/Cr wire, fulfilling high-temperature needs.
Overall, the process optimized efficiency and cost while meeting safety and operational standards.
The implementation of these solutions led to several key achievements in the PWHT process:
