At what intervals should an obstruction investigation be performed where piping passes from warm areas into cold areas in pre-action systems?

In pre-action sprinkler systems, an obstruction investigation is crucial when piping transitions from warm areas to cold areas. This is because the temperature differential can lead to condensation, ice accumulation, and potential obstructions within the piping. Performing the obstruction investigation on an annual basis allows for regular assessment and maintenance to ensure the system remains operational and effective.

Annually is considered a sufficiently thorough interval to detect issues before they become significant problems. It helps in identifying any blockages or degradation in the system that may have developed over the year due to environmental changes. While more frequent inspections could potentially identify issues sooner, annually strikes a balance between thoroughness and practicality, making it an appropriate recommendation for maintaining the integrity of these sprinkler systems.

Understanding the environmental factors that affect pipe conditions is essential, and conducting an investigation once a year aligns with best practices in fire protection maintenance.