Fire Sprinkler Pipe Glossary

Fire Sprinkler Pipe Glossary

AFSA
Abbreviation for the American Fire Sprinkler Association.

AHJ (Authority Having Jurisdiction)
The person, office or organizations that is responsible for approving equipment, materials, installation  or procedure in addition to enforcing the requirements of a standard or code.

Antifreeze Sprinkler System
A wet pipe fire sprinkler system that contains a small amount of antifreeze to prevent the water from freezing.  Some of the antifreeze will be discharged along with water when the sprinkler system activates.

Automatic Sprinkler System
A fire suppression system that operates automatically to the heat from flames.  The fire sprinkler system disperses water in its effect radius.

CRR
Abbreviation for Corrosion Resistance Ratio which measures the relative corrosion resistance of the steel pipe.

Deluge System
Water spray sprinkler system in which all sprinklers and nozzles are open so that when heat is detected the deluge valve is opened, a simultaneous discharge of water occurs through the whole sprinkler system.   

Dry Pipe Sprinkler System
A dry pipe fire sprinkler system is used in installations where water is susceptible to freezing.  Instead of water being stored in the pipes, the water is stored in a central tank location and is dispersed from the tank when one or more of the automatic sprinkler heads are triggered.

Fire Suppression
The direct application of water for the marked reduction of the rate of heat release from a fire and the prevention of its regrowth.

FM
Abbreviation for Factory Mutual which provides certification services to manufacturers of fire protection equipment including fire sprinkler pipe and sprinkler system components.

Mains
Term used to describe the large artery sections of pipe to which branches are connected to in a fire sprinkler system.

NFPA
Abbreviation for the National Fire Protection Association

NPS
Abbreviation for Nominal Pipe Size.  For a listing of nominal pipe sizes that Valmont produces fire sprinkler pipe to, please visit our Fire Sprinkler Pipe Sizes page.

Pipe Grooving
Method of joining two pipes in which a groove is cut or rolled around the pipe to accommodate a clamp.  This is an alternate method of joining pipe as opposed to welding, threading, flanging or soldering.

Risers
Vertical pipes in a fire sprinkler system that connect the main lines with branch lines on various levels of the building.

Schedule 10
To distinguish different weights of pipe it is common to use the schedule terminology.  Schedule 10, depending upon the pipe size, will have varying degrees of wall thickness. The higher the schedule number, the heavier the wall thickness.  For a listing of sizes and wall thickness that Valmont produces schedule 10 fire sprinkler pipe to, please visit our Fire Sprinkler Pipe Sizes  page.

Sprinkler System
An integrated grid of underground and overheard water pipes and sprinkler heads used in building structures for fire protection purposes by controlling and extinguishing fires.

UL
Abbreviation for Underwriters Laboratories which provides customized fire safety testing and certification for manufacturers, regulatory authorities and the fire safety community.

Wet Pipe Sprinkler System
The most commonly used fire sprinkler system using a system of pipes and sprinkler heads where water is stored in a system of pipes so that water is discharged immediately from sprinkler heads when heat from a fire is detected.