Sand Probe Valves

Continuous monitoring of the effects of an abrasive product on flowline and valves is possible with the use of the Pneu-Hydro Products sand probe.

A sensing probe of a predetermined thickness extends through the pipe wall into the flow path of the abrasive product. When the probe is cut, indicating a known degree of erosion to lines, valves, and fittings, pressure from the flowline enters the sand probe valve body, shifting the spool valve and vents off a control pressure. This signal may be used to either close a valve or trigger an alarm.

The device is suitable for use with pneumatic control systems. Select the probe length and thickness from the probe kit chart on this page.

The sensing pilot is designed with a 1/2 NPT male thread for attachment to the pipe. This surrounds a 1/4 NPT female connection. With this configuration, probes can be readily fabricated in the field from standard fittings and tubing.

Features and Advantages

• Wide pressure range: This device may be safely operated in flowlines containing pressures in the range of 25 psi to 10,000 psi.
• Control pressure range: The pilot handles a control system pressure of 20 psi to 250 psi.
• Visual indicator: When the probe has been cut and the pilot spool shifts, the palm button and red band on the main spool indicate that the pilot has been activated.
• Manual control: The palm button on the pilot may be used at any time to cycle the valve and test the system.
• Simplicity: When the probe has been cut by abrasive action of the flowing product, the pressure in the pipeline shifts the pilot spool.
• Choice of probes: Standard wall probes are available in thicknesses of .028; .035; .049; and .065 inches. Standard length probes are 6, 10, and 14 inches.

Selection Procedures

The sand probe gives an accurate indication of the erosion on the flowline and its components. In the following procedure, the use of probes of different wall thicknesses is demonstrated:

• Pipe: 2-inch schedule 80 - normal wall thickness .218-inch.
• Minimum wall thickness for 1200 psi operation: .15 inch.
• Maximum allowable erosion: .068 inch (.218 minus .15).

Specifications

Ordering Information