Proper Mechanical Seal Installation for Pump Maintenance
Installing mechanical seals correctly is crucial for prolonging pump life and increasing Mean Time Between Failures (MTBF). This process involves preparing the pump, maintaining perpendicularity, checking alignment tolerances, and ensuring proper surface finishes. Tips are provided on achieving accurate shaft runout, bearing fits, and bore tolerances for optimal performance.
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Presentation Transcript
Seal Installation Basics Sealing Systems Course 2
Seal Installation Proper installation of any mechanical seal is an essential requirement of any program designed to increase pump MTBF. Preparing pumps for seal installation and subsequently extending seal life is a necessary task that is often taken for granted. The pump manual should not be overlooked as a source of information, the solution to most equipment problems can be found in the maintenance and operating instructions of the pump manufactures manual.
Prepare The Pump Maintain Perpendicularity & Concentricity of all Surfaces Clean/ inspect machined surfaces Gland, Shaft Sleeve, Pump Casing, Impeller Bring the shaft into alignment tolerances. Replace the Impeller if it has excessive erosion, corrosion or wear. Replace any worn components
Alignment Dial Indicator Checks Shaft Runout Sleeve Runout Radial Bearing Fit End Play Bracket/Frame Perpendicularity Seal Chamber Face Bore Check (for pumping ring) Split Case (check 2 halves)
Tolerances Sleeve or Shaft Chamfer 30 X .040 Shaft Run-out .004 speeds up to 1800 rpm .002 speeds grater than 1800 rpm Axial Tolerance .001 to .005 Shafts over 2 dia, add .001 for every inch. Shaft Sleeve Tolerance OD +/-.002 ID +.003/-.000 Bore Tolerance ID +/-.002
Shaft or Sleeve Surface Finish E & D Up to 3.125 Dia. 32-63 Ra Over 3.125 Dia. 25-40 Ra A & B All Sizes 32-63 Ra C Up to 3.125 Dia. 50-125 Ra Over 3.125 Dia. 50-100 Ra X & W All Sizes 16-32 Ra
Seal Installation Single Spring Seals Fit Stationary into Gland Checks Anti-Rotation Pin Lays flat Slide Seal Head over Shaft Checks Drive Band/Bellows Engaged with Retainer DO NOT USE A HAMMER OR GREASE TO INSTALL A MECHANICAL SEAL!!!
Questions? Thank You!
DEMAND QUALITY DEMAND U.S. SEAL
