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70 NWPCA Fire Code Compliance Manual for Outdoor Storage of Wood Pallets | Version 1.0 (December 2017) Sprinklers At 50 years and every 10 years after Where sprinklers have been in service for 50 years, they shall be replaced or representative samples from one or more sample areas shall be tested. Sprinklers (dry) Every 10 years Dry sprinklers that have been in service for 10 years shall be replaced or representative samples shall be tested and then retested at 10-year intervals. Sprinklers (extra high or greater temperature solder type) Every 5 years Representative samples of solder-type sprinklers with a temperature classification of extra high [325°F (163°C)] or greater that are exposed to semicontinuous to continuous maximum allowable ambient temperature conditions shall be tested at 5 year intervals. Sprinklers (fast response) At 20 years and every 10 years after Sprinklers manufactured using fast- response elements that have been in service for 20 years shall be replaced or representative samples shall be tested and then retested at 10-year intervals. Supervisory signal devices Test in accordance with manufacturer's instructions. Waterflow alarm devices (mechanical) Quarterly Verify proper function. Waterflow alarm devices (vane and pressure switch type) Semiannually Verify proper function. Testing of pressure switch–type waterflow alarm devices on wet pipe systems shall be accomplished by opening the inspector's test connection. Maintenance Valve (all types) Internal components shall be repaired, or replaced as necessary in accordance with manufacturer's instructions. A.2.3.3.3 Fire Alarm Systems Visual inspections of fire alarm systems can be performed as outlined in the table below. If devices or equipment is inaccessible due to safety considerations then they shall be permitted to be inspected during scheduled shutdowns.