SITE INFORMATION AND CORRESPONDENCE

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Operating Limitations On vacuum service, with the discharge going to 14.7 PSIA, the inlet suction or vacuum in To permit continued satisfactory perfor- inches of mercury (In. Hg.) must not be mance, a blower must be operated within cer- greater than the values listed in Table 1. tain approved limiting conditions.The manufac- TABLE 1 — 3200 MODELS turer's warranty is, of course, also contingent Series Max. PSIG Max. RPM* on such operation. Maximum limits for or "HG" vac. pressure, temperature and speed are specified 1647 10 3600 here for various blower sizes when operated 17/46 15 3600 under the standard atmospheric conditions. Do 57/81 15 3600 not exceed any one of these limits. 64/67 15 3600 Example: The listed maximum allowable temperature limit (the limit is a function of the 'Maximum RPM may vary depending upon unit size, temperature rise as well as the inlet tempera- pressure and CFM. ture) for any particular blower may occur well TEMPERATURE: Best life for continuous ser- before the maximum speed or maximum vice will be obtained where the maximum pressure rating is reached. Temperature rise discharge temperature on splash lubrication then becomes the limiting condition. In other blowers does not exceed 250°F. words, the operating limit is always to be deter- Cooling coils installed in oil chamber reser- mined by the maximum rating reached first, and voirs or an external lube system with cooler are it can be any one of the four: pressure, generally recommended for air discharge temperature, speed, or horsepower. temperatures from 250-300°F. Discharge Note: Special attention must be paid when temperatures above 300OF normally require an a blower has a higher than standard ambient external lube system with cooler. Consult your suction temperature. Special recommendations MD Pneumatics sales representative if for operating parameters and/or additional cool- temperature questions arise. ing may be recommended. Consult the factory or local representative for appropriate Flow Direction by Rotation information. Be sure to arrange connections or taps for Refer to the illustrations below before install- thermometers and mercury type pressure or ing inlet and discharge piping. vacuum gauges near the inlet and discharge connections of the blower. These, along with a good tachometer will enable periodic checks 0 of operating conditions to be made easily. ',"LET +°mrLEr A�fNT:Irv6 orCM pn ve .e♦]Irv/ ee�r JNry! Note: Specially ordered blowers with sM.a•r/yN rGR .0).r ON N NOIIr•ON .N M//IOM nonstandard construction, or with rotor end clearances greater than shown on page 11, will not have the operating limits specified here. Contact your M D Pneumatics sales represen- �. // �' �` INLE? d/TL[' Q/rC[ lN{tr OII rCQr /�+t[r /NC[r AVR[r tative for specific information. — .; — �- PRESSURE: On pressure service with an in- Aor �••�*OW10 <K*oftNON «�` %•raN C.M.AQr•r/CN Ct)�•O• ON let of 14.7 PSIA, the pressure differential in pounds per square inch (between blower inlet FIGURE 2 and discharge)must not exceed the figure listed in Table 1 for the specific blower model con- cerned. Individual blowers may have further restrictions on operating limits (ref. perfor- mance curves). Consult the factory in any system where the blower inlet is a positive pressure above atmosphere. 3