universal or combination permeability apparatus

UNIVERSAL OR COMBINATION PERMEABILITY APPARATUS:

AS PER IS 2720 (PART XVII)

Introduction:

In soil machines Permeability is one of the important Engineering properties, as it governs rate of settlement of saturated compressible soil layer and rate of flow of equifer.
Permeability is that property of soil which permits flow of water through its interconnecting voids.
The instrument to measure permeability is called permeameter.
The results are used for pumping ground water, for foundation sites excavations, design of dams etc.
Tests can be performed on remoulded or undisturbed samples using constant head or falling head method.
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 co-efficient of permeability in the range of 10-3 to 10-7cm/sec.
The maximum particle size of the soil which can be tested in the mould is 10 mm.

General Description and Specifications:

For determination permeability studies of soil consists of: The equipment comprises one each Consists of

Gun metal mould 100 mm dia x 127.3 mm height x 1000 ml volume.
Gunmetal mould Extension color: 100 mm dia. x 60 mm high.
Gunmetal Drainage base plate with a recess for porous stone and with an outlet valve.
Metallic clamping ring.
Drainage cap (top plate with a recess for porous stone and fitted with an inlet valve and air release valve)
Gunmetal Dummy plate to serve as a false bottom during compaction.
Set of porous stone for base and top plate.
Set of nine glass tubes of 6 mm, 10 mm, 20 mm, 25 mm, 40 mm, 50 mm, 60 mm, 70 mm, 75 mm bore. 75 mm bore tube is provided with overflow arrangement for constant head tests. The remaining tubes are used for falling head test. Mounted on a wooden base stand.
Each glass tube is longer than 1 meter and has a serrated end at the bottom.
To read water head 2 Nos. meter scales are fixed between the tubes.
Rubber tube with pinchcock is provided.

Accessories :-