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ORANGE COUNTY 019913-9 <br /> <br />Emergency Management Warehouse Building Dehumidification General Requirements for <br /> Divisions 23 and 26 Work <br /> <br /> <br />Arrange data so as to allow the results of ensuing tests to be easily added. 1 <br /> 2 <br /> 3 <br />PART 2 - PRODUCTS 4 <br /> 5 <br /> 6 <br />MACHINERY DRIVES 7 <br /> 8 <br />V-Belt Drives: Provide ANSI/Rubber Manufacturers Association (RMA) standard or raw edge cogged V-belts with 9 <br />properly-selected motor pulley and driven sheave. Belts shall be constructed of reinforced cord and rubber. 10 <br /> 11 <br />The drive shall be rated for the motor horsepower indicated on the Drawings, plus the recommended 12 <br />ANSI/RMA service factor (but, not less than 20%), in addition to the ANSI/RMA allowances for pitch 13 <br />diameter, center distance, and arc of contact. 14 <br /> 15 <br />Drives 1 horsepower and smaller may be provided with single standard V-belt. Drives 1-1/2 horsepower and 16 <br />larger shall be provided with raw edge cogged V-belts, the number of belts necessary to transmit the 17 <br />required power with 95% minimum efficiency, but in no case less than 2. 18 <br /> 19 <br />Exception: Belt drives for fans utilized as part of smoke control and/or smoke venting 20 <br />systems shall be rated for the motor horsepower indicated on the Drawings, plus 50% 21 <br />additional service factor, in addition to the ANSI/RMA allowances for pitch diameter, center 22 <br />distance, and arc of contact, and shall have at least 2 belts. 23 <br /> 24 <br />Multiple belts shall be matched to ANSI/RMA specified limits by measurement on a belt measuring fixture. 25 <br />Seal matched sets together to prevent mixing or partial loss of sets. Replacement, when necessary, shall be 26 <br />an entire set of new matched belts. 27 <br /> 28 <br />Sheaves and pulleys shall be fixed pitch type, statically and dynamically balanced, and constructed as 29 <br />follows: 30 <br /> 31 <br />Construction of pressed steel or close grained cast iron. 32 <br /> 33 <br />Bore shall be fixed or bushing type for securing to shaft with keys. 34 <br /> 35 <br />Groove spacing for driving and driven pulleys shall be the same. 36 <br /> 37 <br />Maximum belt speed shall not exceed 5000 feet per minute. 38 <br /> 39 <br />Minimum motor sheave diameter shall comply with ANSI/RMA recommendations as follows: 40 <br /> 41 <br />Shaft Couplings: Shaft couplings for direct drive equipment driven by polyphase motors shall be flexible type capable 42 <br />of absorbing vibration, rated for the motor horsepower indicated on the Drawings plus an additional 50% service 43 <br />factor. Couplings shall be drop-out type to allow disassembly and removal without removing equipment shaft or 44 <br />motor. 45 <br /> 46 <br />Drive Guards: Drive guards shall be provided for belt drives and shaft couplings. 47 <br /> 48 <br />Belt guards shall comply with OSHA and SMACNA requirements of diamond-mesh wire screen welded to 49 <br />steel angle frame or equivalent, prime coated. Secure to fan or fan supports without short circuiting vibration 50 <br />isolation. Include provisions for adjustment of belt tension, lubrication, and use of tachometer with guard in 51 <br />place. 52 <br /> 53 <br />Coupling guards shall be constructed steel and comply with ANSI B15.1, Section 8, and OSHA 1910.219. 54 <br />Guards shall be easily removable for access and service and provided with openings for speed checks, etc. 55 <br />without removal. 56 <br />DocuSign Envelope ID: 7668B866-6C26-485C-9A45-DAAB5D4BD951