Installation Operation and Maintenance Manual

Commissioning, Startup, Operation, and Shutdown (Continued)Shaft-sealing optionsIn most cases, the manufacturer seals the shaft before shipping the pump. If your pump does not have asealed shaft, see the Shaft-seal maintenance section in the Maintenance chapter.This model uses these types of shaft seals:• Cartridge mechanical seal• Conventional inside-component mechanical seal• Conventional outside-component mechanical seal• Packed-stuffing-box optionMechanical seal optionsPumps are usually shipped with mechanical seals installed. If they are not, then refer to the mechanical sealmanufacturer's installation instructions.These are the mechanical seal options for this pump:• Cartridge mechanical seal• Conventional inside component mechanical seal• Conventional outside component mechanical sealConnection of sealing liquid for mechanical sealsSeal lubrication is requiredSeal faces must have liquid film between them for proper lubrication. Locate the taps using the illustrationsshipped with the seal.Seal flushing methodsYou can use these methods in order to flush or cool the seal:MethodDescriptionProduct flushExternal flushOtherPacked stuffing box optionWARNING:Run the piping so that the pump pushes the pumped fluid from the casing andinjects it into the seal gland. If necessary, an external heat exchanger cools thepumped fluid before it enters the seal gland.Run the piping so that the pump injects a clean, cool, compatible liquid directlyinto the seal gland. The pressure of the flushing liquid must be 5 to 15 psi (0.35 to1.01 kg/cm 2 ) greater than the seal chamber pressure. The injection rate must be 0.5to 2 gpm (2 to 8 lpm).You can use other methods that employ multiple gland or seal chamberconnections. Refer to the mechanical seal reference drawing and piping diagrams.Packed stuffing boxes are not allowed in an ATEX-classified environment.The factory does not install the packing, lantern ring, or split gland.These parts are included with the pump in the box of fittings. Before you start the pump, you must installthe packing, lantern ring, and split gland according to the Packed stuffing box maintenance section in theMaintenance chapter.Connection of sealing liquid for a packed stuffing boxWARNING:Packed stuffing boxes are not allowed in an ATEX-classified environment.58 Model 3796 i-FRAME Installation, Operation, and Maintenance Manual