Pipe Hanger Components for Automatic Sprinkler Systems
|Publication Date:||1 December 2016|
This standard encompasses the design and performance requirements for pipe hanger components used in automatic sprinkler systems. Appendix C illustrates various sprinkler pipe hanger components, and is intended to serve as a guide to consistent use of nomenclature for the examination and listings. In cases where metric sized pipe hanger components are to be examined for Approval, test loads comparable to the English equivalent shall be used.
Pipe hangers encompassed by this standard are designed to support NPS 3⁄4, 1, 11⁄4, 11⁄2, 2, 21⁄2, 3, 31⁄2, 4, 5, 6, 8, 10, and 12 in. (20, 25, 32, 40, 50, 65, 80, 90, 100, 125, 150, 200, 250, and 300 mm) nominal pipe sizes.
FM Approval standards are intended to verify that the product described will meet stated conditions of performance, safety, and quality useful to the ends of property conservation.
Other types of hanger components may be FM Approved if they meet the requirements and intent of this standard. Components of unusual design may be subjected to special tests to determine their suitability.
This standard does not evaluate pipe hanger components with respect to their adequacy to resist earthquake forces and pipe displacements in earthquake-exposed areas (FM Global 50-year through 500-year earthquake zones as shown in Data Sheet 1-2, Earthquakes).
Where post-installed concrete anchors are to be used in earthquake-exposed areas they should be separately determined, based on a recognized national or international standard (e.g., American Concrete Institute [ACI] standard 355.2 "Qualification of Post-Installed Mechanical Anchors in Concrete and Commentary"), to be allowed and adequate for the test loads specified in this Approval Standard when installed in cracked concrete.
Adequacy of pipe hanger components to resist the upward or downward reaction from earthquake sway bracing is not evaluated by this standard.
Adequacy of pipe hanger components subject to swinging of unbraced piping in an earthquake is not evaluated by this standard.
This standard states FM Approval criteria for pipe hanger components used in automatic sprinkler systems. FM Approvals Class 1951 encompasses most pipe hanger components including attachments to steel and wood building members; Class 1952 encompasses concrete expansion shields, anchors and screws (i.e. post-installed concrete anchors installed in hardened concrete); and Class 1953 encompasses concrete inserts (devices installed before the concrete pour and embedded in concrete).
FM Approval criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a follow-up audit program.