tender for supply and installation of technical textile laboratory machines, cross permeability test apparatus and in plane permeability test apparatus. , cross permeability test apparatus 01 no to determine the following parameters:permeability of geotextiles under unidirectional flow conditions and meets the requirements of astm-d4491-92 & the permeability characteristics of geotextiles normal to the plane complying to astm d4491 the systems should be capable of performing both constant head test and variable test according to the above-mentioned standards. constant head test: a head of at least 50 mm of water should be maintained on the geotextile throughout the test. the quantity of flow is to be measured versus time. falling head test: a column of water is to be allowed to flow through the geotextile, and a reading of head changes versus time is taken. the flow rate of water through geotextiles shall be slow enough to obtain accurate readings. specification: reference standard: astm d4491. the system should be capable of performing tests using both the constant head method and the variable head method. the constant head test is to be carried out using a head of 50 mm of water. applicable specimen diameter should be 100 mm. the cross-permeability test apparatus should have an overhead tank of at least 110 litres capacity. a loading unit of dead weight type of at least 300 kpa capacity should be supplied. in plane permeability test apparatus: 01 no to determine the following parameters: the flow rate per unit within the manufactured plane of geosynthetics under normal compressive stress and a constant head complying with astm- d4716. specifications: reference standard: astm- d4716 this system should be capable of measuring the quantity of water that flows through a test specimen along the plane of the geotextile. in the apparatus, flow occurs radially outwards, from a central hole to the periphery of a circular specimen. the cross-permeability test apparatus shou