Piping Plan 52 Set Up (Graphics Courtesy of Hydraulic Institute, www.pumps.org) Dual mechanical seal with reservoirs can be used with good effect in implementing Plan 52 to provide buffer fluid resulting in no direct leakage of process fluid to the atmosphere. Circulation between the reservoir and outer seal is maintained by tangential flow porting [...]
Best seal practices for a pump start-up after an extended shut-down Review and follow pump start-up procedures. Rotate shaft by hand to make sure seal faces are not stuck together. Assure bolts and screws are tightened to proper torque settings. Check motor rotation. Vent Pump to assure it is not vapor locked. Assure mechanical [...]
How to recognize potential mechanical seal failure: wear groove on seal face Get into a root cause/corrective action mode when you start noticing a wear groove on the seal face in order to prevent potential mechanical seal failure. Normal Wear Pattern on Seal Face Deep Wear Groove on Seal [...]
AST RESERVOIR FOR DUAL MECHANICAL SEALS High Performance & Exceptional Value The AST reservior supplies a clean buffer/barrier liquid to a dual mechanical seal without an expensive piping system. Since the AST80 dual cartridge seal has a double balanced inboard seal, the reservoir may be pressurized for tandem seal service. Reservoirs can [...]
How Silicon Carbide Outperforms Tungsten Carbide Silicon Carbide out performs Tungsten carbide as hard faces in most seal applications. It's tribological properties allows for lower coefficient of friction and longer life. In heavy slurry or other extreme pumping conditions the properties are enhanced when you match silicon carbide with a silicon carbide impregnated with [...]
BIG BORE A big bore provides a better machanical seal environment than a standard bore seal chamber and provides better isolation from heat. TAPER BORE A taper bore seal chamber typically provides the best mechanical seal environment. Both types offer the following advantages Increased radial clearance between the mechanical seal [...]
Why Use a Flush Port? It may seem like common sense, however, many users simply plug the port Most applications (ANSI pumps), a line from discharge to seal flush provides circulation to cool seal and flush solids away from the seal. For dirty applications, use a clean liquid flush from an outside source. This [...]
Single Spring Seal vs. Component Seal vs. Cartridge Seal GOOD Single Spring Seal BETTER Component Seal BEST Cartridge Seal Positive Low initial cost Good alternative to packing Positive Inexpensive initial cost Multiple springs for even loading on seal faces Springs outside of process fluid [...]
MECHANICAL SEALS OR PACKING? There is an upside to change from packing to mechanical seals, however not all conditions favor seals, so a good general knowledge about sealing systems is important in the decision process. In order to understand why pumps need to be sealed, we need to go back to some pumping basics and [...]
What Is The Difference Between Single and Dual Mechanical Seals? Single Cartridge Seal - AST What Is A Single Mechanical Seal? A single mechanical seal consists of two very flat seal faces that are forced together by a spring and slide against one another. Between these two faces is a thin fluid film [...]
