Controls Group Constant Head permeability apparatus Constant Head permeability apparatus

Constant Head permeability apparatus

BS 1377:5
General description
General description
The soil permeability is a very important factor to study the behavior of soil in its natural condition with respect to water flow. The constant head method is particularly suitable for relatively coarse grained soil such as sands and gravel. 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 (codes 38-T0184/A1 and 38-T0184/B1).
The stand 38-T0184/A2 comprehends 3 manometer tubes , meter scale, nipples and connecting tubing.
The 38-T0184/A3 Constant level tank is manufactured from acrylic plastic, complete with inlet, outlet, overflow , connecting tubing and attachment for wall mounting.
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Technical specifications

Permeability cells
38-T0184/A1, weight approx.: 2.7 kg
38-T0184/B1, weight approx.: 6.5 kg

38-T0184/A2. Dimensions: 1150x200x50 mm. Weight approx.: 3 kg

38-T0184/A3  Dimensions: 250x155x160 mm. Weight approx.: 2.6 kg

Ordering info

Constant head permeability cell, 75 mm dia., 3 pressure points

Constant head permeability cell, 114 mm dia., 6+6 (blanked) pressure points

Stand with 3 constant bore tubes and accessories

Constant level tank complete with inlet,  outlet, overflow, tubing and attachment for wall mounting


Tamping rod 8 mm dia. x 300 mm