NZS 4541 Test machine of fire protection systems and equipment AUTOMATIC SPRINKLER HEADS. 

The results of the assembly load test, 6.15.2, shall form the basis for calculating the upper tolerance limit of the sprinkler assembly load. The lower tolerance limit for bulb strength shall be determined using the results obtained from subjecting a minimum of 25 sample bulbs to an increasing load until the bulbs fail.

Each test shall be conducted with the bulb mounted in hardened steel inserts with seating surfaces having dimensions which conform to the actual mating components of the sprinkler. The inserts shall have a hardness within the range rockwell HRC 38-50 (see Fig.3). They shall be provided by the manufacturer each time the test is specified. The load shall be applied at a rate of compression not exceeding 1 .25 mm/min. The results obtained from the two sets of data shall be utilized for the tolerance limit calculations. 

Included in this NZS 4541 is procedures and testing service intervals for:

Fire Sprinklers

Fire Pump Sets

Fire Hydrant Systems

Water Storage Tanks for Fire Protection Systems

Fire Detection and Alarms Systems

Special Hazard Systems

Delivery Lay Flat Hose

Fire Hose Reels

Portable and Wheeled Fire Extinguishers

Fire Blankets

Passive Fire and Smoke Systems

Fire and Smoke Control Features of Mechanical Services

Emergency Planning In Facilities