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Nfpa 1045
Nfpa 1045
Nfpa 1045
Nfpa 1045
Nfpa 1045
Nfpa 1045
Nfpa 1045
Nfpa 1045
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  • 1. Approval Standard forWaterflow Detector Check Valves om .c se Class Number 1045 a gb in in tra re .fi February 1976 www ©2002 FM Global Technologies LLC. All rights reserved.
  • 2. ForewordFM Approvals are intended to verify that the products and services described will meet stated conditions ofperformance, safety and quality useful to the ends of property conservation. The purpose of FM ApprovalStandards is to present the criteria for FM Approval of various types of products and services, as guidance forFM Approvals personnel, manufacturers, users and authorities having jurisdiction.Products submitted for Approval shall demonstrate that they meet the intent of the Approval Standard, and thatquality control in manufacturing and/or applications shall ensure a consistently uniform and reliable product orservice. FM Approval Standards strive to be performance-oriented and to facilitate technological development. omFor examining equipment, materials and services, FM Approval Standards: .c a) must be useful to the ends of property conservation by preventing, limiting or not causing damage under the conditions stated by the Approval listing; and se b) must be readily identifiable. aContinuance of Approval and Listing depends on compliance with the Approval agreement, satisfactory gbperformance in the field, on successful re-examinations of equipment, materials, and services as appropriate, andon periodic follow-up audits of the manufacturing facility or service/application. inFM Global Technologies LLC reserves the right in its sole judgement to change or revise its standards, criteria, inmethods, or procedures. tra re .fi w w w
  • 3. TABLE OF CONTENTSI. DESIGN ........................................................................................................................................................................................ 1 1.1 Sizes .................................................................................................................................................................................... 1 1.2 Rated Working Pressure ..................................................................................................................................................... 1 1.3 End Connections ................................................................................................................................................................. 1 1.4 By-Pass Connections For Meter ........................................................................................................................................ 1 1.5 Clearances In Valves With Corrosive Body ...................................................................................................................... 2 1.6 Clapper Assembly ............................................................................................................................................................... 2 1.7 Removal of Parts ................................................................................................................................................................ 2 1.8 Performance ........................................................................................................................................................................ 2 1.9 Differential .......................................................................................................................................................................... 2 1.10 Materials ........................................................................................................................................................................... 2 1.11 Markings ........................................................................................................................................................................... 3 om 1.12 Head Loss ......................................................................................................................................................................... 3 1.13 Waterway .......................................................................................................................................................................... 3 1.14 Seat Ring ........................................................................................................................................................................... 3 .c 1.15 Meter By-Pass ................................................................................................................................................................... 3 1.16 Meter ................................................................................................................................................................................. 3 seII TESTS .......................................................................................................................................................................................... 4 a 2.1 Loss of Head ....................................................................................................................................................................... 4 2.2 Seat Leakage ....................................................................................................................................................................... 4 gb 2.3 Body Hydrostatic ................................................................................................................................................................ 4 2.4 Differential .......................................................................................................................................................................... 4 inAPPENDIX APPROVAL MARKS .............................................................................................................................................. 5 in tra re .fi w w w
  • 4. February 1976 1045 Many water companies require private fire service lines to be supervised in order to detect loss of water through leakage or misuse. Detector check valves, with their weighed clappers, direct small flows through a by-pass line that contains a water meter. Large flows for fire protection lift the clapper and pass unmetered. FM Approval is based on examination and test of production samples, inspection of the manufacturing or quality control facilities, and of design and workmanship, uniformity and dependability of production, effectiveness of quality control, and assurance of service and replacement parts. These requirements are guides. Mere conformity does not assure approval; other considerations may control. Nor is strict conformity necessary; devices having different characteristics may be considered and approved if shown to be essentially equivalent or superior in performance. om .cI. DESIGN1.1 Sizes a se gb Present standard sizes for fire protection service are 4, 6, 8 and 10 inch. Twelve and 14 inch sizes are expected in in the near future. in tra1.2 Rated Working Pressure Valves shall be designed for a rated working pressure of 175 psig minimum. re .fi1.3 End Connections w Present detector check valves have flanged end connections. Other end connections will be considered when and w if they appear. w1.4 By-Pass Connections For Meter 1.4.1 The body shall be provided with two bosses on each side in order to permit the installation of either a right or left hand by-pass line. These bosses shall be furnished with 2 inch maximum threaded pipe outlets for valves 4 to 10 inch in size. Outlet sizes for 12 and 14 inch valves will be the sizes required by the water works for their meters, when the valves appear. FM APPROVALS 1
  • 5. 1045 February 19761.5 Clearances In Valves With Corrosive Body 1.5.1 The clearance between the periphery of the clapper and the inside of the body in every position of the clapper from closed to wide open shall be at least 3/4 inch. 1.5.2 There shall be a clearance of at least 1/2 inch between the clapper hub and the inside of the body. 1.5.3 There shall be sufficient clearance between the length of the clapper hub and the faces of the hinge pin bushings to prevent binding of the clapper when it swings.1.6 Clapper Assembly 1.6.1 The weight of the clapper shall be located inside the valve body. om 1.6.2 Clapper parts shall be assembled in such a manner that they will not separate in reasonable service use and abuse. .c 1.6.3 Clapper parts including the weight housing shall be corrosion resistant. The weight itself shall preferably be lead. a se1.7 Removal of Parts gb Replaceable internal parts shall be removable through an opening in the body without having to remove the valve in body from the pipe line. A suitable cover shall be provided for the opening. in1.8 Performance tra Valves shall be watertight when subjected to service pressures up to 175 psig acting on the outlet side of the re clapper with atmospheric pressure on the inlet side. .fi1.9 Differential w w The pressure drop across the clapper required to lift it off its seat shall not exceed 2.0 psig. w1.10 Materials Materials used in the construction of the detector check valve shall be suitable for the intended application. Contact surfaces between rotating or moving and stationary parts shall be corrosion resistant.2 FM APPROVALS
  • 6. February 1976 10451.11 Markings The following data shall be cast in raised characters on the valve body or cover or both: manufacturer’s name or trademark, valve size, directional arrow of water flow, year of manufacture, and rated working pressure.1.12 Head Loss The loss in pressure through the valve shall not exceed 3.0 psig for the following rates of water flow. Valve Size Flow inches gpm 4 750 6 1500 om 8 3000 10 4500 12 6500 .c 14 9000 a se1.13 Waterway gb When wide open, the check valve shall have a waterway equal to the area of the pipe. The toe of the clapper shall be free to rise above the waterway. in in1.14 Seat Ring tra The seat ring shall be of bronze or other corrosion resistant material. re .fi1.15 Meter By-Pass w There shall be a manually operated control valve and a swing check valve in the by-pass line in order that the meter can be removed for repairs without impairment of the fire protection system. w w1.16 Meter The sizes commonly used are: 1, 11⁄2 or 2 inch. Ordinarily the size would be determined by the requirements of the water works having jurisdiction. FM APPROVALS 3
  • 7. 1045 February 1976II TESTS2.1 Loss of Head The valve will be installed horizontally between two flanged test pipes with piezometer rings. The test pipes will have the same diameter as the valve. The head loss in the test pipe is known. The head loss between piezometers will be measured for a sufficient number of flows, including the one given for the valve size under Paragraph No. 1.11.2.2 Seat Leakage To determine valve tightness, they will be tested at 30, 60, 100 and 175 psig and its rated pressure (if higher) om for five (5) minutes at each water pressure. Total water leakage shall not exceed 1/2 pint. .c2.3 Body Hydrostatic se With the clapper removed or blocked off its seat, the valve body will be subjected to 400% of rated working pressure for 5 minutes. a gb2.4 Differential in The pressure differential across the clapper needed to lift the clapper from its seat will be measured. in tra The valve will be horizontally level. Both flanged ends will be plugged. An open pipe will be installed vertically in one of two downstream by-pass outlets. The top end will be adjusted re to be level with the top of the valve cover dome. .fi A transparent open pipe will be installed vertically in one of the two upstream by-pass outlets. It will be w approximately 6 feet long and marked at the point which is level with the top of the other pipe, i.e., the top of the cover dome. w w Water will be poured into the transparent pipe until it comes to the top of the other pipe. At this time the vertical distance between the top water levels in the two pipes will be measured. If the distance is X inches, the valve’s differential = (X times 0.036) psig.4 FM APPROVALS
  • 8. February 1976 1045 APPENDIX APPROVAL MARKS REPRODUCTION ART: FM Approval Marks For use on nameplates, in literature, advertisements, packaging and other graphics. 1) The FM Approvals’ diamond mark is acceptable om to FM Approvals as an Approval mark when used with the word ‘‘Approved.’’ .c 2) The FM Approval logomark has no minimum se size requirement, but should always be large enough to be readily identifiable. a gb 3) Color should be black on a light background or a reverse may be used on a dark background. in in For Cast-On Marks tra 4) Where reproduction of the mark described above is impossible because of production re restrictions, a modified version of the diamond is suggested. Minimum size specifications are the .fi same as for printed marks. Use of the word ‘‘Approved’’ with this mark is optional. w w wNOTE: These Approval marks are to be used only in conjunction with products or services that have beenFM Approved. The FM Approval marks should never be used in any manner (including advertising, sales or promotionalpurposes) that could suggest or imply FM Approval or endorsement of a specific manufacturer or distributor. Nor shouldit be implied that Approval extends to a product or service not covered by written agreement with FM Approvals. TheApproval marks signify that products or services have met certain requirements as reported by FM Approvals.Additional reproduction art is available throughFM ApprovalsP.O. Box 9102,Norwood, Massachusetts 02062USA FM APPROVALS 5

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