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The apparatus is used for the laboratory determination of permeability of soils using a constant or a variable head. This test is recommended for soils with coefficient of permeability in the range of 103 to 107 cm/sec. The minimum particle size of the soil which can be tested in the mould is 10mm.
A stand with nine glass tubes of 6mm, 10mm, 20mm, 25mm , 40mm, 50mm, 60mm, 70mm, 75mm, bore. 75mm bore tube is provided with overflow arrangement for constant head tests . the remaining tubes are used for falling head test
The equipment comprises one each:
Gun metal mould , 100mm I.D x 127.3 mm high x 1000 ml volume
Gun metal mould extension collar, 100mm dia x 60mm high for above mould.
Gun metal drainage base plate with a recess for a porus stone and with outlet valve.
Metallic clamping ring
Gun metal drainage cap top plate with a recess for a porous stone and fitted with an inlet valve and an air release valve
Gun metal dummy plate to serve as a false bottom during compaction.
Porus stone for drainage cap.
Porus stone for base plate.
Set of glass stand approximately 6mm dia, 10mm dia and 20mm dia. Each glass tube is longer than 1 meter and has a serrested end at the bottom. To read water head meter scales are fixed between the tubes. A length of meter long rubber tubing with pinch cock is also supplied