Data Sheets - 1305 Series Regulators Bulletin, Fisher-EN

The 1305 Series regulators (Figure 1) are directoperated, pressure-reducing regulators that resist hydrate formation and regulator freeze-up. The regulators are suitable for service with natural gas, air, propane, and other gases compatible with the internal parts. 1305 Series regulators are typically used on high-pressure lines from wellheads and separators. Regulator freeze-up resistance (see Figure 2) occurs as the pipeline gas warms the finned inlet adaptor and the orifice area. As the gas cools within the inlet adaptor due to pressure drop and volume expansion, the warm inlet adaptor helps keep the gas temperature above the freezing point of water and the hydrate formation temperature.