Isolation Rings by Ashcroft

Moving heavy waste material is hazardous duty for pumps. This is especially true in settling and sedimentation tanks, where solids separate by sinking to the bottom and are then pumped to the next processing stage in the form of sludge or slurry. Even though they are specifically designed for this work, these pumps can be easily damaged if inadequately monitored and controlled.

The greatest threat to pumps is cavitation. This phenomenon occurs when the suction side of the pump is starved, usually due to a blockage in the line. This lowers the suction pressure below the fluid’s saturated vapor pressure point, causing bubbles to form. As the bubbles are carried over to the discharge side where the impeller has raised the pressure, the bubbles will collapse. These implosions will cause shockwaves that will damage the impeller, shaft and the inside of the housing. The same consequence occurs when high discharge pressures cause the fluid to circulate inside the pump, intensifying the fluid velocity between the impeller and the housing causing bubbles to form.

To avoid cavitation, keep pipes, screens and inlets clear of clogs. Monitor the pump’s suction and discharge pressures. This can be achieved by installing an instrument assembly that includes an 80, 81 or 82 isolation ring or diaphragm seal with a flush port (such as the type 201) or a flush mounted DF seal. Instrumentation can include a 1279 Duragauge® pressure gauge, a GC51 transmitter for remote monitoring and a B4 pressure switch to send an alarm signal to safely shut down the pump in case an alarm condition occurs.

80 Series Wafer Isolation Ring

The Ashcroft® 80 isolation ring is mounted inline with process piping. Used for process protection of measuring instruments, the ring-design eliminates process accumulation, assuring accurate pressure readings. Ideal when continuous pressure measurement is needed.

80 Series Wafer Isolation Ring Key Features:

• 360° sensing flexible inner-liner; no process deadleg
• Safe Quick Release™ (optional) enables instrument removal without loss of fill or process shutdown
• Needle valve (optional) dampens pulsation effects
• Retrofit end plates (optional) allows easy replacement of other manufacturer models

 

81 Series Bolt Thru Isolation Ring

The Ashcroft® 81 isolation ring is mounted inline with process piping. Used for process protection of measuring instruments, the ring-design eliminates process accumulation, assuring reliable and accurate pressure readings. Ideal when continuous pressure measurement is needed.

81 Series Bolt Thru Isolation Ring Key Features:

• 360° sensing flexible inner-liner; no process deadleg
• Safe Quick Release™ (optional) enables instrument removal without loss of fill or process shutdown
• Needle valve (optional) dampens pulsation effects
• Retrofit end plates (optional) allows easy replacement of other manufacturer models

82 Series Threaded Isolation Ring

The Ashcroft® 82 isolation ring is threaded in-line with process piping. It is designed for threaded piping systems to protect pressure measuring instruments. The ring-design eliminates process accumulation, assuring accurate readings.

82 Series Threaded Isolation Ring Key Features:

• 360° sensing flexible inner-liner; no process deadleg
• Safe Quick Release™ (optional) enables instrument removal without loss of fill or process shutdown
• Needle valve (optional) dampens pulsation effects

Process Markets:

• Water and Wastewater
• Mining
• Pulp and Paper

Contact us at (855) 737-4714 to learn more or fill out our online form.