DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

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2-8 Earthquake Protection Page 40 FM Global Property Loss Prevention Data Sheets 2.2.1.5 Clearance 2.2.1.5.1 Provide clearance around piping through walls or floors per the following guidelines. A. Except as allowed in Section 2.2.1.5.1(B), where piping passes through walls, platforms, mezzanines, roofs, or floors, provide a hole or sleeve with a nominal diameter 2 in. (50 mm) larger than the pipe for pipes 1 in. (25 mm) diameter through 3- 1 ⁄ 2 in. (90 mm), and 4 in. (100 mm) larger than the pipe for pipe sizes 4 in. (100 mm) and larger. Openings may be sealed with mastic or a weak, frangible mortar. If the pipe passes through a fire separation, the space can be filled with mineral wool held in place with a pipe collar. B. Clearance is not needed when wall material is frangible, such as gypsum board, and the wall is not required to have a fire rating. 2.2.1.5.2 Provide at least 2 in. (50 mm) clearance between piping and walls/structural members in the following locations: A.Between ends of piping and walls/structural members. B. When piping passes through walls/structural members, then turns 90 degrees to run parallel to the wall, between the parallel pipe run and the wall/member. C. When piping passes through walls/structural members, between any flanges, fittings, or other devices on the piping and the wall. 2.2.1.5.3 Provide clearance to sprinklers per the following guidelines. A. For sprinklers installed in suspended ceilings, provide an oversize adapter through the ceiling tile to allow for free movement of 1 in. [25 mm] in all horizontal directions, if possible. If not possible, provide at least a 1 ⁄ 2 in. (13 mm) gap around ceiling penetrations for sprinklers. B. For other sprinklers, provide vertical and horizontal clearance of at least 2 in. (50 mm) to structural or nonstructural elements. A smaller clearance is acceptable where the system is arranged so that less relative movement between the sprinkler and the object is expected (e.g., by providing hangers that limit upward vertical movement; see Section 2.2.1.8.1) or where the sprinkler is protected from impact. Provide greater horizontal clearance (4–6 in. [100–150 mm]) to sprinklers when possible. 2.2.1.6 Restraint of Items That Can Impact Sprinklers 2.2.1.6.1 For storage racks with in-rack sprinklers, obtain documentation to verify that rack anchorage and rack design meet the design standards for new construction in Data Sheet 1-2, Earthquakes, or equivalent seismic design code requirements for the seismic zone involved. In the absence of such verification, have a seismic analysis conducted by qualified personnel, and make any resulting recommended improvements. Bolt the racks to the floor, cross brace between racks, or employ other techniques as necessary. 2.2.1.6.2 Anchor/brace suspended ceilings that have sprinklers below. One acceptable method is to provide vertical compression struts and diagonal splay wire bracing at a 45 degree angle in all four directions, on 12 ft (3.7 m) centers. Other methods that provide suitable anchorage may be used, such as those described in National Earthquake Hazard Reduction Program (NEHRP) Provisions for Seismic Regulations for New Buildings, or American Society of Civil Engineers (ASCE) Standard 7, Minimum Design Loads for Buildings and Other Structures. 2.2.1.6.3 Anchor/brace all other equipment that may impact the sprinkler system. Such equipment includes, but is not limited to, HVAC equipment (ductwork, diffusers, heaters, etc.), conveyors, and cable trays. 2.2.1.7 Pipe Joining Methods 2.2.1.7.1 Use welded or rigid pipe connections, except when flexible couplings are specifically recommended per Section 2.2.1.4. This includes all branch line and branch line riser nipple connections to crossmains, branch line connections to riser nipples, and the two connections for any take-out piping installed on gridded branch lines to facilitate flushing investigations. Unless specifically recommended in Section 2.2.1.4, use of extra flexible couplings will necessitate additional lateral sway bracing per Sections 2.2.1.1.4(C) and 2.2.1.1.5(A)(6). 2.2.1.7.2 Do not use plain-end couplings (two semicircular halves that fit together to connect pipe ends and having no torque indication devices to ensure proper installation) for sprinkler installations. FM Approved ©2010 Factory Mutual Insurance Company. All rights reserved.
Earthquake Protection 2-8 FM Global Property Loss Prevention Data Sheets Page 41 plain-end fittings (one-piece devices into which pipe ends are inserted and held in place by set screws that have a torque-indicating means to ensure proper torque has been applied) are acceptable for use in areas where earthquake protection is needed. 2.2.1.8 Type, Attachment, and Locations of Hangers 2.2.1.8.1 Adhere to the hanger guidelines in Data Sheet 2-0, Installation Guidelines for Automatic Sprinklers, with the following exceptions: A. Do not use powder-driven fasteners to attach hangers to the building structure. B. Provide hangers of the type that resist upward vertical movement at the following locations (note that for very long armovers, hangers in addition to those recommended below will be needed when normal hanger spacing rules apply): 1. On all armovers to vertical pipe drops that supply more than one sprinkler, regardless of the length of the armover, located within 2 ft (0.6 m) of the drop. 2. On all armovers greater than 2 ft (0.6 m) long that supply one sprinkler, located within 2 ft (0.6 m) of the drop (see Fig. 21). C. Provide all C-clamp hangers with retaining straps to minimize the potential that the C-clamp will slip off the structural member. D. Provide hangers on branch lines arranged to prevent the pipe from bouncing upward at the following locations. 1. At every other hanger on gridded branch lines. 2. At the last hanger on dead-end branch lines, including outrigger lines on gridded systems. E. To minimize potential damage from impact, ensure the hanger closest to any upright sprinkler that is located within 2 in. (50 mm) both horizontally and vertically of a structural or nonstructural element is a type that resists upward vertical movement. F. Provide hangers for in-rack sprinkler piping of a type that resists upward vertical pipe movement. Provide no more than 1 ⁄ 2 in. (13 mm) of space between the top of the pipe and the hanger’s point of vertical resistance. Provide positive mechanical attachment to the rack structure that provides resistance to vertical movement and does not allow the hanger to slip sideways off the point of attachment. Provide retaining straps on all C-clamps. 2.2.1.9 Pipe Material 2.2.1.9.1 Do not use nonmetallic pipe in aboveground installations. 2.2.2 Standpipes 2.2.2.1 Seismic Considerations for Standpipes 2.2.2.1.1 Treat standpipes the same as sprinkler system risers with regard to sway bracing, flexibility, and clearance. 2.2.2.1.2 When hose outlets are fed from pipe that penetrates walls or floors, provide flexibility, clearance around the piping, and clearance between the piping and walls the same as for sprinkler pipe. 2.2.3 Water-Spray Systems 2.2.3.1 Seismic Considerations for Water-Spray Systems 2.2.3.1.1 In general, treat water-spray systems the same as sprinkler systems with regard to sway bracing, flexibility, and clearance. 2.2.3.1.2 Use special approaches for sway bracing design and attachment to the equipment or structure when necessary based on the nature of the particular system and the equipment being protected by the water-spray system. ©2010 Factory Mutual Insurance Company. All rights reserved.
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DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

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