Constant Head Permeability Apparatus
Product Code : EL-STLE-10373
Quick Answer: The Constant Head Permeability Apparatus is a laboratory instrument used to determine the permeability of soil under a constant head, an important property for understanding how water moves through soil in its natural condition. It is particularly suited to relatively coarse grained soils such as sands and gravel, testing a coefficient of permeability in the range of 0-10-3 to 10-7 cm/sec with a maximum particle size of 10mm, and is available in two models with 75 and 114 mm nominal cell diameters. For fine grained soils such as clay-like or silty soils, the related Falling Head Permeability Apparatus is used instead.
The soil permeability is a very important factor to study the behavior of soil in its natural condition with respect to water flow, and this apparatus is used for the laboratory determination of permeability of soil using a constant or a variable head. The constant head method is particularly suitable for relatively coarse grained soil such as sands and gravel, and this test is recommended for soils with coefficient permeability in the range of 0-10-3 to 10-7 cm/sec, with the maximum particle size of the soil which can be tested in the mould being 10mm. For fine grained soils such as clay-like or silty soils, see Falling head permeability apparatus.
The apparatus consists of a Perspex permeability cell mounted on a detachable aluminium base and head. The cylinder has pressure points at different levels, which have to be connected to the manometer stand and to the constant level tank. Two models available: 75 and 114 mm cell nominal diameter.
Standards: BS 1377 | ASTM 46-47 | IS 2720 (PART XVII) 1966
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Last Updated: September 2026
Related Products: Falling Head Permeability Apparatus, Relative Density Test Apparatus, Sand Density Cone Apparatus, Water Level Indicator
