Minimizing Circuit Board Strain Propagation in Surface Mounted Pressure Sensors
Milled PCB isolation slots and controlled solder standoff heights decouple surface mount pressure sensors from assembly flexure and thermal board strain.
Gasket Sealing
Joint Assembly
Mechanical barrier methods prevent the escape of pressurized fluids from the junctions of joined components. Engineers specify gasket sealing to secure connections between pipe flanges, pressure vessels, and engine blocks. The method requires a compliant material to fill the micro-voids and surface irregularities of rigid mating surfaces.
Compression Load
Effective operation depends on the application of adequate clamping force to deform the sealant into the surface finishes of the flanges. This gasket sealing action requires a balance of bolt torque to achieve the necessary surface pressure without crushing the sealing element. Insufficient preload results in a fluid path, whereas excessive load can cause elastomer extrusion or flange distortion.
Performance Limit
Thermal expansion and pressure cycles introduce stress relaxation that degrades the integrity of the joint over time. In high-pressure environments, gasket sealing must withstand both the internal blowout pressure and the chemical action of the process fluid. Systematic torque checks are scheduled to monitor and correct any loss of clamping force.
Material Selection
Metallic or elastomeric compounds are chosen based on the operating temperature and the chemical action of the contained fluid. Soft elastomers are utilized for low-pressure systems, while spiral-wound metal components are chosen for high-temperature and high-pressure steam lines. In chemical processing plants, the chosen material must resist chemical degradation to prevent catastrophic failure during service campaigns.
Incorrect selection of the compound can lead to rapid embrittlement, swelling, or complete dissolution of the joint barrier, which allows hazardous materials to escape into the environment.