Phone: 800-257-5183 Web: www.campbellmfg.com Fax: 610-367-5675 Email: [email protected] Monoflex Product Catalog Page 68 Recharge: An addition or replenishment of water to the ground water supply by infiltration of precipitation or surface water through the soil. Resin: An organic substance, generally synthetic, which is used as a base material for the manufacture of some plastics. Saturated Zone: The part of a water-bearing material in which all voids are filled with water. Schedule Pipe: Plastic pipe that is produced to the same dimensions as steel pipe. As the schedule number increases the inside diameter decreases while the outside diameter remains constant for any given pipe size. Sch. 80 is a heavier wall pipe than Sch. 40 and Sch. 120 is heavier than Sch. 80. Unlike pipe produced to SDR’s, the pressure rating of schedule pipe decreases as the diameter increases. Schedule pipe and SDR pipe have the same O.D.’s with the exception of SDR 35 which has O.D.’s based on cast iron pipe sizes (there are other exceptions as well). SDR: Standard Dimension Ratio. Pipe made to a particular SDR will have the same pressure rating regardless of diameter. For example SDR 21 pipes have a pressure rating of 200 PSI and SDR 26 pipes have a pressure rating of 160 PSI for all sizes. SIDR: Standard Internal Dimension Ratio. Pipe made to this specification is internal diameter controlled. Slot: A machined opening in pipe whose length is greater than it’s width. Most commonly machined using a saw blade, however; the opening may be milled. Stabilizer: A chemical substance which is frequently added to plastic compounds to inhibit undesirable changes in the material, such as discoloration due to heat or light. Surface Impoundment: A holding area often used by industry to store wastewater as part of the treatment process. Thermoplastic Materials: Materials which soften when heated to normal processing temperatures without the occur- rence of appreciable chemical change, but are quickly hardened by cooling. Unlike thermosetting materials; they can be reheated to soften, and re-cooled to “set”, almost indefinitely; they may be formed and reformed many times by heat and pressure. Thermosetting: Plastic materials which undergo a chemical change and harden permanently when heated in processing. Further heating will not soften these materials. Transpiration: Part of the hydrologic cycle whereby water is returned to the atmosphere from the leaves of plants. Unconfined Aquifer: An aquifer whose water table is exposed to atmospheric pressure. In unconfined aquifers the water level found inside the well casing or screen is the same as that in the surrounding soils; as opposed to wells drilled into artesian aquifers where the level inside the well will rise to a level greater than that which water was first encountered during drilling. Unconsolidated Formations: Soils composed of sands, gravels, silts, clays, organic materials, etc. As opposed to consolidated formations consisting of competent rock. UST: Underground Storage Tank. Vadose Zone: The zone containing water under pressure less than that of the atmosphere, including soil water, intermediate vadose water, and capillary water. This zone is limited above by the land surface and below by the surface of the zone of saturation, that is, the water table. VOC’s: Volatile Organic Compounds. Wash-Down Valves: Monoflex wash-down valves are designed to position well screens in sandy soils and to thin drilling fluids. Water pumped through a wash-down valve attached to the bottom of a screen acts to jet the screen into place. The internal female pipe thread allows for the attachment of the jetting pipe. When the water is shut off a check ball rises into a closed position to seal off the bottom of the well. Water Table: The level below which the soil or rock is saturated with water, sometimes referred to as the upper surface of the saturated zone. Well: A vertical drilled hole into an underground formation, usually to obtain a source of water; to monitor ground water quality; or to determine the position of the water table. Said holes may also be drilled on an angle or horizontally. Well field: An area which contains two or more water supply wells that provide ground water for a single water system. In general, well fields provide water for communal, commercial, industrial, and agricultural uses. GLOSSARY OF TERMS (CONTINUED)
