some remedial actions are discussed in the
Conditions that indicate the need for
maintenance for automatic sprinklers include the
. Mechanical injury such as bent or loose
deflectors or bent frames. Where sprinklers are
subjected to continual damage, provide approved
l Corrosion such as marked discoloration or
hard deposits. Use lead-coated or wax-coated
sprinklers to prevent corrosion.
. Overheating causes soldered joints and
cracked quartz bulbs to give way. Temperature
ratings for soldered link sprinklers should be 50 F
above (for quartz bulb sprinklers 25 F above)
normal room temperature.
. Freezing produces reduced tension in
soldered links, bent struts, and distorted caps.
. Loading is deposits of paint or other
. Need for replacement or relocation. Major
construction and occupancy changes and changes
to heating, lighting, and air-conditioning systems
may require relocation or replacement of
sprinklers or additions to the system. Changes in
sprinkler location and pipe sizes should be based
upon an engineering evaluation.
. Where sprinklers are installed in areas
where there is stockpiling of materials a clearance
of at least 18 inches under the sprinklers is
necessary for proper water distribution.
Keep a supply of extra sprinklers for the
various types and temperature ratings required
and a sprinkler wrench.
Outside Open Sprinklers
When you are servicing outside open
sprinklers, you should do the following:
. Visually check the general condition of
. Close windows and doors and take proper
precautions to avoid water damage to property
before making flow tests.
. Conduct the flow test by opening the
After making flow tests, remove and clean any
plugged or obstructed sprinklers.
Piping and Hangers
In servicing piping and hangers, check for
mechanical injury and corrosion. Replace bent or
damaged piping and fittings and replace or repair
missing or loose hangers. Make sure that piping
is not used to support stock, equipment, or other
Make sure wet pipe system piping is properly
protected against freezing. Before and during
freezing weather, check piping of dry pipe systems
for proper drainage. During freezing weather,
open drains for outside sprinkler systems. Drain
water from low point drains and drum drips on
dry pipe systems before freezing weather occurs.
When evidence of obstruction of piping has
been found, check for the following sources of
Improperly screened inlets from open
bodies of water
Poorly maintained elevated gravity tanks
Dead end of extensive water distribution
Poorly installed underground mains
Highly acid, alkaline, or saline water
Active chemicals in water supply
Use of secondhand materials in the
Frequent operation of systems (especially
dry pipe systems) introducing additional
foreign material and free oxygen
Alarm Check Valves
Perform a 2-inch drain test quarterly to test
alar m check valves. Open the 2-inch drain valve