top of page
Search

Tubular Sight Flow Indicator Rebuild

  • Jun 1, 2023
  • 2 min read

Updated: Aug 10

Check out our latest maintenance video. Jacoby-Tarbox Product Manager Dave Purcel goes through the proper procedure for rebuilding a tubular sight flow indicator.


What a Tubular Sight Flow Indicator Is

A tubular sight flow indicator uses a transparent glass tube to give operators a direct, continuous view of fluid flowing through a pipeline - confirming flow is present, checking flow direction, or visually verifying process fluid clarity. Like other transparent glass instrumentation, the tube itself is exposed directly to process fluid and pressure, which is why periodic rebuild and maintenance matters over the life of the unit.


Signs a Tubular Sight Flow Indicator Needs Attention

Similar to the wear patterns operators watch for on gage glass, a tubular sight flow indicator can show staining, clouding, or a worn appearance that hinders clear viewing over time. Left unaddressed, deteriorating visibility undermines the entire purpose of the instrument - if operators can't clearly see the flow, the sight indicator isn't doing its job regardless of whether the pipeline itself is functioning normally.

Seals and gaskets at the connection points are also subject to the same wear factors as any other pressure-retaining glass instrument - thermal cycling, sustained pressure, and age can all reduce sealing integrity over time, making periodic inspection and rebuild an expected part of ownership rather than a sign something has gone wrong.


Why Rebuild Rather Than Replace

As with other glass instrumentation in the Jacoby-Tarbox and Jerguson product lines, a tubular sight flow indicator's body is generally designed to be serviceable - meaning worn components like the glass tube and gaskets can be replaced without discarding the entire unit. This keeps ongoing maintenance costs lower than full replacement and reduces the downtime associated with sourcing and installing an entirely new indicator.


Following Proper Procedure Matters

Rebuilding any pressure-retaining glass instrument correctly - achieving proper seal seating, correct torque, and safe handling of the glass component - is what determines whether the rebuilt unit performs reliably afterward. This is exactly why a demonstrated, step-by-step video walkthrough from someone who does this work regularly is more valuable than a written procedure alone: it shows the actual technique, not just a checklist of steps.


Learn More

To view the full maintenance video with Dave Purcel's demonstration of the tubular sight flow indicator rebuild procedure, visit our video library, or contact our Jacoby-Tarbox team with questions about your specific sight flow indicator maintenance needs.


Related Products & Resources:


bottom of page