HALE Silencer AP Series, Инструкция по установке, эксплуатации и техническому обслуживанию

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Introduction
16
Section 2: Introduction
Hale Products, Inc., May 2006, Rev-B
discharge outlet.
Figure 2-4: Impeller Operation
Clearance Rings
Clearance rings prevent pressurized water that is leaving the pump volute
from returning to the intake of the impeller.
They also prevent leakage, accomplished by limiting the radial clearance
between the spinning impeller and the stationary clearance ring. Also see
Figure 2-3: “Typical Pump and Gearbox Overview” on page 15.
Typically, a clearance ring has a radial clearance of about 0.0075” (0.191
mm) or between 0.015” to 0.020” (0.381-0.508 mm) per side. Clearance
rings are designed for replacement when wear limits cause the pump to
exceed NFPA standards for satisfactory performance.
Mechanical Seal
The “maintenance-free,” mechanical seal is common to Hale pumps. (See
Figure 2-5: “Typical Mechanical Seal Overview.”)