Is an obstruction investigation required every five years?
There are two activities that are related to obstructions in Chapter 13 that require our attention. The first is an investigation that is actually more of an “inspection” as described in Section 13.2.1 that must be conducted every five years. While the sprinkler system is shut down for the purpose of internal valve inspections (See Table 12.1), the flushing connection at the end of one crossmain and a single sprinkler at the end of one branchline must be removed and the inside of the piping is then “inspected” for the presence of organic and inorganic material.
