Dry Horizontal Sidwall Sprinkler Required Minimum Barrel Length Based on Ambient Temperature in the Protected Area
The FM installation guidelines may differ from cULus and/or NFPA criteria.
Quick Response Dry Horizontal Sidewall Sprinklers are cULus Listed as indicated in Approval Chart 1 for installation in accordance with the latest edition of NFPA 13 for standard spray sprinklers.
• Limited to Light Hazard occupancies only.
• Protection areas and maximum spacing shall be in accordance with the tables provided in NFPA 13.
• Minimum spacing allowed is 6 ft. (1.8 m).
• Deflector must be positioned between 4” and 6” (102 mm and 152 mm) below the ceiling. Keep the top of the deflector oriented parallel with the ceiling.
• Locate no less than 4” (102 mm) from end walls.
• Maximum distance from end walls shall be no more than one-half of the allowable distance between sprinklers. The distance shall be measured perpendicular to the wall.
• The sprinkler installation and obstruction rules contained in NFPA 13 for sidewall standard spray sprinklers must be followed.
Horizontal sidewall sprinklers installed so that water is not trapped.
In the 2007 edition of NFPA 13, a new section (8.4.10) was added to discuss some of the installation requirements where dry-type sprinklers are concerned.
This new section requires that the barrel of the sprinkler be a minimum length when it is connected to wet piping to make sure that the cold temperatures do not conduct up the barrel of the sprinkler and freeze the water in the wet piping
Unfortunately, the standard does not specify exactly how long the barrel of the dry sprinkler needs to be. The user needs to go to the manufacturer’s literature on the sprinkler to determine a minimum number.
Minimum Barrel Lengths for Dry-Type Sprinklers (220.127.116.11). Dry-type sprinklers (dry pendent, dry upright, and dry horizontal sidewall sprinklers) have always needed a minimum barrel length when connected to wet piping to prevent the piping from freezing due to cold temperatures being conducted back to the branch line.
he minimum barrel length is dependent on the expected cold temperature outside and the warm temperature to which the barrel will be maintained.
The problem is that these minimum lengths were in the manufacturer’s literature and each manufacturer used slightly different numbers because they made slightly different assumptions in calculating the minimum length that was needed.
The information has been moved to NFPA 13 and standardized (with all of the manufacturers agreeing to the standardized lengths) to simplify the requirement and to make sure that everyone,
including architects, knows the correct lengths.
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