PNEUMATIC MEASUREMENTS OF PRESSURE - THE PROBLEM OF HEAD LOSSES

MESURES PNEUMATIQUES DE PRESSIONS - LE PROBLEME DES PERTES DE CHARGE

The Glotzl measuring pressure cell is now used with a pneumatic measuring chain. The sensor is a manometer, which can be adapted to the value to be measured and recalibrated if needed. It is generally admitted that head losses are small and even negligible for the gas rates of flow and Rilsan pipes used. The research reported gives the results of an experimental determination of the loss of head for various rates of flow, 4 x 6 mm and 2 x 6 mm and at different pressures in Rilsan pipes and is completed by the determination of loss of head in 1 x 2 mm Rilsan pipes, with which the ac50 counter-pressure pneumatic sensors with controlled rate of flow are equipped. When counter-pressure pneumatic devices are used for in-situ measurements the sensor must be protected against dust which could block the return opening or modify the behaviour of the sensitive membrane. Because of this, head losses caused by a filtering insert introduced in the Rilsan pipe and preventing all particles greater than 50 microns to enter the pipe were also measured. /TRRL/

• Corporate Authors:

  Laboratoire Central des Ponts et Chausees (LCPC)

  Boulevard Lefebvre 58
  Paris Cedex 15,   France  F-75732
• Authors:
  • Levillain, J P
• Publication Date: 1973-9-10

Language

• French

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 21-25
• Serial:
  • Bulletin de Liaison des Lab des Ponts et Chaussees
  • Issue Number: 67
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Core samples; Drilling; Dust; Filters; Flow; Hydrologic phenomena; Loss and damage; Measuring instruments; Pneumatic equipment; Pressure; Pressure gages; Sensors; Soils
• Old TRIS Terms: Core drilling; Manometers; Pneumatic devices
• ITRD Terms: 6155: Apparatus (measuring); 3814: Compressed air; 4323: Discharge (flow); 4572: Dust; 7182: Filter; 9040: Loss; 5412: Pressure; 6120: Sensor; 4156: Soil
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00128298
• Record Type: Publication
• Source Agency: Central and Regional Labs of Bridges & Highways,Fr
• Files: ITRD, TRIS
• Created Date: Apr 7 1976 12:00AM