PI 4750 RS 5750 ESC 2L1 – SpiralTrac – EnviroSeal Bushing

Overview

The PI 4750 RS 5750 ESC 2L1 SpiralTrac is a patented throat bushing manufactured by EnviroSeal Engineering for controlling internal stuffing box environments in rotating process equipment. This split-installation SpiralTrac design allows in-place installation without equipment shutdown. The carbon graphite filled PTFE (ESC) construction provides excellent chemical compatibility and wear resistance in demanding industrial pump and mechanical seal applications.

Key Features

• Patented spiral groove design — removes particulates from stuffing box and prevents debris contact with packing or mechanical seals
• Reduced or eliminated flush requirement — operates effectively with minimal or no external flush in many applications
• Active cooling circulation — minimizes heat buildup around seal faces through controlled flow dynamics
• Split installation capability — fits standard 4.75″ shaft with 5.75″ seal cavity bore for retrofitting without equipment removal
• Contamination barrier — air venting prevents stuffing box flooding while maintaining separation from fibrous process media
• Extended equipment life — reduces downtime associated with premature seal and packing wear

Technical Specifications

Typical Applications

• Centrifugal pumps — refinery, petrochemical, and chemical process service
• Pulp and paper equipment — refiners and process pumps handling fibrous media
• Water and wastewater systems — municipal and industrial treatment facilities
• HVAC circulation pumps — cooling tower and closed-loop systems
• Mechanical seal support — replacement for conventional throats bushings and packing rings
• Low-flush/no-flush applications — reduces external seal flush requirements in environmentally sensitive operations

Compatibility & Replacements

Compatible With

• Pumps with 4.75″ rotating shaft diameter and 5.75″ stuffing box cavity bore
• Compression packing arrangements with 2 packing rings and 1.0″ lantern ring
• Chesterton and third-party mechanical seal systems
• A.W. Chesterton SuperSet packing assemblies
• Pumps requiring right-hand (clockwise) rotation sealing
• Flush or low-flush seal configurations

Replaces / Drop-In Replacement For

• Standard L-shaped throat bushings in 4.75″ x 5.75″ cavity configurations
• Conventional packing lantern rings in equivalent pump cavity geometry
• Legacy environmental control bushings in centrifugal pump services

Works With

• Chesterton API Plan 53A seal support systems
• Standard mechanical seal kits for 4.75″ shaft applications
• Industrial packing grades (PTFE-impregnated, graphite, and aramid)
• Minimal flush or barrier fluid systems in chemical services
• Double-ended pump applications (when paired with left-rotation SpiralTrac for opposite end)