PORE PRESSURE

The pore pressure measuring apparatus consists of a screw pressure pump, null indicator in Perspex, pressure gauge, mercury manometer, volume change burette and the necessary connecting tubes and valves. It is used for measuring pore water pressure and pore air pressure in soils. It has many features, which simplify the operation. The Null Indicator is made from a transparent Perspex block. It is a simplified U-Tube Null Indicator, in which water can bypass mercury if null indicator is tilted; thus de-airing process by circulation of water is facilitated. All features enable a visual check to be made during the de-airing operation of apparatus. A mercury manometer and a pressure gauge of Bourdon Tube type are provided on the panel on which the whole equipment is mounted. Very small positive or negative pressures are observed on the manometer. A 50 ml burette is clamped to a sliding bracket on one side of the panel. It is used for measuring the volume change in the specimen when subjected to confining pressure in the triaxial cell
The following models of Pore Pressure Apparatus are available:
1. Pore Pressure Apparatus, 1000 kPa (10 kg/cm2) Capacity
The equipment consists of:

• Pressure Gauge, Bourdon Tube Type, Graduation: -1.0 to +10 bar in 0.1 bar division (or -100 to +1,000 kPa in 10 kPa divisions) Dia: 200 mm
• Manometer, Glass U Tube, measures low positive and negative pore pressure and checks zero error of pressure gauge. It is provided with a mercury trap. (Mercury supplied at extra cost)
• Null Indicator, Perspex with mercury trap and cursor to indicate the mercury level
• Burette, 50 ml, for measurement of volume change in the soil specimen
• Pressure Pump, fitted with four Ball Valves
• Copper Coil
• Water Reservoir