Passive Red Tops

With Red Top Indicator, Provides Early Warning Detection of Bellows Leakage

Passive Red Top

Red Top pops up if positive media pressure leaks through inner ply causing pressure to build up between the plies. It does not register attachment weld failure.

Standard Features:
a) Outer ply is tapped to attach a Red Top or other pressure sensing device that can register leakage of the inner ply.
b) Each ply is designed for the full system pressure and temperature.
c) Bleed valve to eliminate any trapped gases that could result in a false reading during start up.
d) Flow test port to guarantee bellows is ply testable.

Benefits

1. Early warning leak detection.
2. Two bellows allow for 100% redundancy.
3. System can function while a convenient fi x can be arranged.
4. Minimizes potential downtime in high risk service, where bellows failure could cause an outage (FCCU, turbine crossovers).
Senior Flexonics Pathway’s Red Top early warning indicator is mounted directly on a two-ply testable bellows. Each ply is designed for the full system pressure and temperature. The two bellows plies provide 100% redundancy.

In the “Passive” Red Top Design, the Red Top is activated by the pressure of the media if a failure of the inner ply occurs. The activating pressure for the “Passive” Red Top is 5 psig. If a leak occurs in the inner ply of the bellows, the red post pops up into view. It can easily be seen from 50 feet away during a routine pipe inspection.

By using a ply testable bellows, with or without a Red Top, preparations can then be made for an orderly, scheduled shutdown while a replacement expansion joint is on order. The Red Top minimizes potential downtime in high risk service where a bellows failure could cause an unscheduled outage.