Variable Springs are used to support piping which is subject to thermal expansion and other factors that may cause the pipe support point to shift. The force of spring varies through the range of travel, hence the name “Variable Supports”. As the supported structure moves upward the force exerted by the spring decreases while the opposite occurs during downward movement.
Variable supports are typically installed where thermal movements cause the system’s position and dimensions to change; however, if the variability surpasses 25%, Rilco recommends our Constant Supports or the Rilco Cam Roller Constants.
All of the Rilco spring units are designed to meet or exceed the requirements of the ASME Code for Pressure Piping, ASME B31.1, B31.3, and MSS SP-58.