ASTM / AASHTO Constant Head Permeameters

ASTM / AASHTO Constant Head Permeameters determine the coefficient of permeability by the constant head method for the laminar flow of water through granular soils. Karol-Warner permeameters are offered in diameters from 2.5in (63.5mm) — 9in (229mm), allowing permeability tests on granular soils with particle top size up to 0.75in (19mm).

Clear acrylic sample chambers allow easy viewing during the test procedures. Two manometer ports are vertically spaced at a distance equal to the chamber diameter. No. 100 brass mesh at each port prevents the migration of material into the manometer. A spring is incorporated into the top cap to apply 5-10lbs force against the top stone or plate to prevent soil density changes during the test. Anodized aluminum end caps are fitted with valves and ports for vacuum and water sources. Tubing is included. Two Porous Stones each are included with the 2.5in (63.5mm), 3in (76.2mm), and 4.5in (114.3mm) permeameters, while the 6in (152.4mm) and 9in (228.6mm) diameter chambers are each supplied with two Perforated Plates. Either the Wall Mounted Manometer or Free Standing Manometer is required and must be purchased separately. Both feature a 100cm graduated scale and valves.

Features:

• Meet ASTM and AASHTO requirements for constant head permeability measurements of granular soils up to 0.75in (19.0mm) topsize
• No. 100 mesh placed over manometer ports prevents loss of soil materials
• Different diameters for a wide range of particle top sizes
• Rugged acrylic and anodized aluminum construction

Included Items:

• ASTM / AASHTO Constant Head Permeameters
  • 2.5in includes two 50247014 Porous Stones
  • 3in includes two 50295514 Porous Stones
  • 4.5in includes two 50448012 Porous Stones
  • 6in includes two HM-761 Perforated Plates
  • 9in includes two HM-762 Perforated Plates
• No. 100 Stainless Steel Mesh
• Tubing for water supply

Accessories:

• Double Tube Manometer, Wall-Mounted has double tubes and is required for use with the permeameters for testing permeability of granular soils
• Double Tube Manometer w/ Stand
• Permeability Compaction Hammer easily compacts soil samples for testing in accordance with ASTM standards
• 1,000cc Constant Head Tank connects to water source and supplies water during constant head permeability testing
• 2.47in Diameter Porous Stone, 0.25in Thick provides support to the soil sample and prevents flow of particles into testing fluid
• 2.955in Diameter Porous Stone, 0.25in Thick
• 4.48in Diameter Porous Stone, 0.50in Thick
• 6in Perforated Plate used with larger specimens to support samples and permit flow of permeant fluids
• 9in Perforated Plate