Orifice Union B16.36
Class 1500 Weld Neck Orifice Flanges
B16.36 weld neck orifice flanges rated for Class 1500 service
Class 1500 Weld Neck Orifice Flanges represent the highest standard pressure class covered by B16.36 for orifice flow measurement. These flanges are engineered for extreme-pressure environments where accurate flow data is essential for process control, safety instrumentation, or fiscal metering.
At Class 1500, flange dimensions become substantially heavier, with significantly thicker bodies, larger bolts, and tighter bolt spacing compared to lower classes. The available size range is typically NPS 1/2 through NPS 8, reflecting the practical limits of orifice plate flow measurement at very high pressures.
These flanges are found in high-pressure gas injection systems, subsea production equipment, and ultra-high-pressure chemical reactors. The combination of extreme bolt loading and precision-machined orifice plate bores demands careful installation procedures and torque sequencing to achieve proper gasket compression without distorting the measurement bore.
