The metal bushing interface is a key part of plate heat exchangers, linking pipelines and the heat exchanger body. Embedding a metal bushing in the metal nozzle effectively upgrades its connection performance. Here is a concise overview:
Structure & Materials
It mainly comprises a stainless steel nozzle and a dedicated metal bushing (e.g., copper bushing). The nozzle has a flared section, where the bushing is tightly fitted and welded in place. Some designs add a bronze welding ring to boost welding performance.
Common bushing materials cover copper, stainless steel, titanium, Alloy 254, Alloy C-276, chosen according to the working medium, temperature, pressure and other operating conditions.
Interface Type
Threaded interfaces (internal & external) are widely applied, complying with standards like ISO-G, NPT and ISO 7/1. They are easy to install and dismantle, ideal for small-diameter connections.
Key Advantages
Corrosion resistance: Isolates corrosive fluids from the plate and frame, effectively protecting the heat exchanger body.
Reliable sealing: Tight welded connection minimizes leakage risks.
Easy installation & maintenance: Material-matched bushings (e.g., copper bushings for copper pipelines) simplify installation and later replacement.
Installation & Maintenance Tips
Ensure tight fitting and firm welding during installation. Tighten threaded interfaces to the rated torque with professional tools, and reduce extra pipeline stress on the heat exchanger.
Conduct routine checks for leakage and corrosion. For threaded types, inspect thread conditions and replace seals or repair damages in a timely manner.