Approval Standard            forWaterflow Alarm Indicators        (Vane Type)                                             ...
ForewordFM Approvals are intended to verify that the products and services described will meet stated conditions ofperform...
TABLE OF CONTENTSI. SCOPE ...................................................................................................
July 1970                                                                                                   1042I. SCOPE  ...
1042                                                                                                     July 1970        ...
July 1970                                                                                                    1042III. REQU...
1042                                                                                                       July 1970E. Rat...
July 1970                                                                                                      1042       ...
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Nfpa 1042

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Nfpa 1042

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Nfpa 1042

  1. 1. Approval Standard forWaterflow Alarm Indicators (Vane Type) om .c a se gb Class Number 1042 in in tra re .fi w w July 1970 w ©2002 FM Global Technologies LLC. All rights reserved.
  2. 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. 3. TABLE OF CONTENTSI. SCOPE ........................................................................................................................................................................................ 1II. GLOSSARY ................................................................................................................................................................................ 1 A. Vane ...................................................................................................................................................................................... 1 B. Body ..................................................................................................................................................................................... 1 C. Instantly Recycling Retard .................................................................................................................................................. 1 D. Instantly Recycling Retard .................................................................................................................................................. 2 1. Location ............................................................................................................................................................................ 2 2. Performance ...................................................................................................................................................................... 2III. REQUIREMENTS ................................................................................................................................................................... 3 A. Performance ......................................................................................................................................................................... 3 B. Friction Loss ........................................................................................................................................................................ 3 om C. Vane Assembly ..................................................................................................................................................................... 3 E. Rated Working Pressure ....................................................................................................................................................... 4 F. Assembly ............................................................................................................................................................................... 4 .c G. Wiring Diagrams .................................................................................................................................................................. 4 se H. Enclosure .............................................................................................................................................................................. 4IV. MATERIALS ............................................................................................................................................................................ 4 aV. MARKING .................................................................................................................................................................................. 4 gbAPPENDIX APPROVAL MARKS .............................................................................................................................................. 5 in in tra re .fi w w w
  4. 4. July 1970 1042I. SCOPE The waterflow alarm indicator with instantly recycling retard is used in a wet pipe sprinkler system to sound an electrical alarm when one or more sprinklers operate. FM Approval is based on examination and tests of production samples, inspection of the manufacturing or quality control facilities, and satisfactory field experience. Particularly considered are functional suitability, adequacy 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 .cII. GLOSSARY a se The waterflow alarm indicator is made up of the vane, body, switch, and instantly recycling retard. gbA. Vane in in The submersible vane is moved by the water flow. The movement is transmitted through suitable levers to open or close switch contacts. traB. Body re .fi The body’s primary functions are to: 1. Provide support for levers between the vane and the switch. w 2. Permit strapping the indicator to the pipe. w 3. Provide a support for the switch. wC. Instantly Recycling Retard This device operates, after a predetermined time has elapsed from the initial movement of the vane, to sound the alarm. 1. There shall be no mechanical failure nor any appreciable change in the operating characteristics as a result of this test. 2. The vane assembly shall be subjected to the following forward flow rates for 30 minutes. FM APPROVALS 1
  5. 5. 1042 July 1970 Indicator Flow Size-in. gpm 2 150 2 1⁄ 2 250 3 400 4 750 5 1000 6 1500 8 3000 There shall be no mechanical failure nor any appreciable change in the operating characteristics as a result of this test. om When designing vane assemblies the following factors should be taken into consideration: 1. Reverse flow conditions — occasioned by draining sprinkler system or break in fire service main. .c 2. Ample clearance between vane periphery and inside diameter of pipe. seD. Instantly Recycling Retard a gb 1. Location It may be designed as an integral part of the indicator or it may be in a separate enclosure detached from the in indicator. in 2. Performance tra The retard shall be these characteristics: re a. When the initial water flow occurs, the retard shall operate to delay the electric alarm for any pre- selected period of 0-60 seconds. While an adjustable time delay of 0-60 seconds is preferable, a time delay .fi having a maximum limit of 120 seconds will be acceptable. Suitable instructions indicating means for increasing or decreasing the retard shall be provided. w b. In the event the water flow ceases before the completion of the pre-selected time delay, the retard shall w automatically reset in such a manner that the entire retard cycle must be repeated when water flow again w occurs. c. Contacts shall be arranged to permit operation on either open or closed circuits.2 FM APPROVALS
  6. 6. July 1970 1042III. REQUIREMENTSA. Performance Waterflow alarm indicators shall be so designed that they may be installed in either horizontal or vertical pipe and that after proper initial factory adjustment they will: 1. Operate at a rate of flow between 4 and 20 gpm at any service pressure between 20-100 psig. 2. Operate on any flow rate in excess of minimum flow to give alarm. 3. Not operate at flows less than 4.0 gpm. 5. Transmit successive alarms without manual resetting. omB. Friction Loss The loss in pressure passed the indicator shall not exceed 5.0 psi at the following flows: .c se Indicator Flow Size-in. gpm 2 a 150 gb 2 1⁄ 2 250 3 400 in 4 750 5 1000 in 6 1500 tra 8 3000 re The need for running friction loss tests will be determined after an examination of a sample indicator. .fiC. Vane Assembly w w Vane assemblies shall have sufficient mechanical strength to resist flows created by fluctuating water pressures and operation of several sprinklers. w To evaluate the design, a sample 6 in. indicator—considered representative of the line—shall be subjected to the following tests: 1. The vane assembly will be subjected to 100,000 flexes. A single flex involves moving the van in the forward direction through an angle of 45° from its ‘‘normal’’ position (at zero flow) and then permitting it to return to ‘‘normal’’. Rate of flexes shall be approximately 18-20 per minute. A rubber faced roller (approximately O.D. of 3 in.) connected to the end of an air powered oscillating rod will be arranged to strike the vane at its center when it is in the ‘‘normal’’ position. The roller moves at all times in a direction perpendicular to the plane of the vane when in its ‘‘normal’’ position. FM APPROVALS 3
  7. 7. 1042 July 1970E. Rated Working Pressure Indicators shall be designed for a rated working pressure of 175 psi. To determine design adequacy, a 6 in. sample will be hydrostatically tested at 700 psi for five minutes. There shall be no failure as a result of this test.F. Assembly Indicators shall be designed so that when installed the vane will always be at right angles to the water flow. Whenever practical, the use of asymmetrical parts shall be employed. omG. Wiring Diagrams Schematic electrical wiring diagrams shall be attached to the inside cover of each indicator. .c seH. Enclosure a A drip tight enclosure shall be provided to protect the switch(es) and associated wiring. gb in in traIV. MATERIALS re All materials used in the construction of the indicator and retard shall be suitable for the intended application. .fi Special attention should be given to the selection of proper materials for use in water to avoid ‘‘galvanic’’ action. w The use of materials which change part dimensions from water absorption should be avoided in situations where such change may interfere with operating characteristics. w wV. MARKING A corrosion resistant nameplate shall carry the following data: name, abbreviation or trademark of the manufacturer, size, model designation, and electrical ratings. A direc- tional arrow shall be provided to ensure correct installation. The arrow may be placed on the enclosure or the saddle.4 FM APPROVALS
  8. 8. July 1970 1042 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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