Constant Head Permeability Apparatus
Product Code : EL-STLE-10373
Constant Head Permeability Apparatus (code EL-STLE-10373) is a laboratory set for measuring the permeability of relatively coarse grained soils, such as sands and gravel, while water flows through the sample under a constant head. Its Perspex cell sits on a detachable base and head of aluminium, accepts soil with particles up to 10 mm, and is made in two models with nominal cell diameters of 75 and 114 mm.
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Specifications
| Parameter | Detail |
|---|---|
| Use | Laboratory determination of the permeability of soil using a constant or a variable head |
| Suitable soils | Relatively coarse grained soils such as sands and gravel |
| Permeability range | Coefficient of permeability 10^-3 to 10^-7 cm/sec |
| Maximum particle size | 10 mm, for soil tested in the mould |
| Cell | Perspex permeability cell |
| Base and head | Detachable, aluminium |
| Pressure points | At different levels on the cylinder, for connection to the manometer stand and the constant level tank |
| Models | Two: 75 mm and 114 mm nominal cell diameter |
| Standards | BS 1377, ASTM 46-47, IS 2720 (Part XVII) 1966 |
| Product code | EL-STLE-10373 |
| Manufacturer | Engineering Lab Equipment, Ambala, Haryana, India |
What Is the Constant Head Permeability Apparatus Used For?
Permeability describes how readily water passes through a soil, and it governs seepage under dams and embankments, the design of drains and the rate at which excavations take in water. In the constant head method the soil is placed in the Perspex cell, the constant level tank holds the water level above the sample steady, and the pressure points along the cylinder are connected to the manometer stand so that the loss of head through the soil can be read. The water passing through in a measured time is collected, and the coefficient of permeability is calculated from the flow, the head and the sample dimensions.
What to Specify When Ordering
- Quantity — the number of constant head sets required.
- Model — the 75 mm or the 114 mm nominal cell diameter.
Frequently Asked Questions
Which soils is the constant head method suited to?
It is meant for relatively coarse grained soils such as sands and gravel. Clay-like or silty soils, which pass water much more slowly, are tested in the Falling Head Permeability Apparatus instead.
What cell sizes can be supplied?
Two models are offered, with nominal cell diameters of 75 mm and 114 mm. In both, the Perspex cell sits on a detachable aluminium base and head.
What is the largest particle size that can be tested?
Soil placed in the mould for this test may contain particles up to a maximum size of 10 mm.
How is the head measured during the test?
Pressure points set at several heights on the cylinder are linked to the manometer stand and the constant level tank, so the head of water across the sample can be read.
Over what range of permeability is the test used?
Soils with a coefficient of permeability in the range 10^-3 to 10^-7 cm/sec are the ones this constant head test is recommended for.
Which standards are listed for constant head testing?
For this apparatus, the standards listed are BS 1377, ASTM 46-47 and IS 2720 (Part XVII) 1966.
OEM Manufacturer
Buyers of the Constant Head Permeability Apparatus deal directly with its maker, Engineering Lab Equipment (Engineering Labs Equipment Pvt Ltd), whose works are at Plot No. 43, Industrial Park, Sector 2, Growth Center, Saha, District Ambala, Haryana, India. The company designs, makes and tests soil testing equipment for classification, compaction, density, shear and consolidation tests, supplies engineering colleges, polytechnics, technical training institutes and research laboratories in India and overseas, and builds to institution-specific requirements on request. Tender details are on the Tenders/OEM page.
Related Soil Testing Equipment
- Falling Head Permeability Apparatus — variable head permeameter for soils of 10^-3 to 10^-7 cm/sec with particles up to 10 mm.
- Relative Density Test Apparatus — vibratory table set with 3000 ml and 15000 ml moulds for relative density of granular soils.
- Sand Density Cone Apparatus — double cone sand replacement set with plastic jars and base plate for field density.
- Water Level Indicator — portable electric contact dipper for borehole and well water levels, 50 to 200 m cable.
See the full Soil Testing Lab Equipment range or all Civil Engineering Lab Equipment.
Request a Quote
For this and other soil testing lab equipment, schools and colleges can contact Engineering Lab Equipment, a manufacturer, supplier and exporter based in Ambala, India. Quotations are given on request: send the number of sets and the cell diameter required, 75 or 114 mm and your delivery location through the contact page, or add the Constant Head Permeability Apparatus to the enquiry cart from this page.
Last updated: October 2026
