2. Dynamic pressure drop. As with any fluid, steam flow through the circuit is impeded by friction in the pre-insulated tubing, jacketing elements, and jumpers. Friction results in dynamic pressure drop in the steam. The primary influence on dynamic pressure drop is the cross-sectional flow area of the pre-insulated tubing (connecting the supply manifold to the jacketing) and the jumpers. Decreasing the flow area can have a significant impact on pressure drop. For example, reducing the tubing/jumper diameter from 3/4” to 1/2” results in an 8X increase in dynamic pressure drop!