Underground drainage pipes

Underground drainage pipes. On level land, water can be danuned in the ditches and allowed to flow up the drainage pipes into the subsoil and lower soil layers. This is drainage in reverse ... 

The overwhelming majority of PVC resin—over 99%—sold for the fabrication of pipe, siding, conduit, and windows eventually becomes salable product. There is very little in-process waste in the pipe and conduit industry if in-process materials are unsuitable for pressure pipe, it can be used in a product ranging from first-grade drain waste and vent to slotted underground drainage pipe. 

The non-fluid, non-critical containment requirements of these products mean that polymer compound costs and production costs can be minimised. Underground cable and telecommunication ducts are produced as variants of minimum mechanical specification drainage pipes. Where high flexibility is required, to allow cabling around tortuous paths in equipment and buildings, then corrugated pipes are used. Since there is no fluid flow... 

EN 1115 Parts 1-7 Plastics piping systems for underground drainage and sewerage under pressure - glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP). 

Invert elevation This term, usually associated with any underground line, refers to the elevation of the inside bottom of the sewer line, as shown in Exhibit 13-1- Because of the wide range of materials used in drainage piping systems with varying wall thicknesses, it is the constant that is ased to set the elevation on construction drawings. 

When cathodic protection is applied to an underground metal structure the greatest effect on the pipe to soil potential is at the drainage point. This effect decreases, or attenuates, as the distance from the drainage point increases. 

Drainage out of process structure/area into an external containment area. The drainage may be achieved either by surface swales or berms, ditches or trenches, or via an underground piping system... 

Above ground piping should be examined to determine its condition and to verify that proper drainage pitch is maintained. Underground piping should be spot-checked for deterioration at least every five years. 

Plastics are often used in corrosive environments for chemical tanks, water treatment plants, and piping to handle drainage, sewage, and water supply. Structural shapes for use under corrosive conditions often take advantage of the properties of RPs. Today s underground tanks must last thirty or more years without undue maintenance. To meet these criteria they must be able to maintain their structural integrity and... 

Install critical power, control, instrument, and alarm wiring and pneumatic tubing outside the fire-exposed envelope. Cable trays and conduit banks should be routed underground or on the upper levels of elevated pipe racks at least 30 feet above the ground and outside the drainage path of hydrocarbon spills. Install fire proofing of critical systems and equipment if they are inside the fire-exposed envelope. 

To reduce the danger from flammable gas underground, long boreholes may be drilled in the strata ahead of the working face and the methane drawn out of the workings and piped to the surface, a technique known as methane drainage that is common in Europe. The extracted gas is frequently utilized on the surface and pure methane has a calorific value of 1012 Btu/ft. 

Many solvents are used to remove CO2 from gas streams. These solvents are reclaimed in a separate drainage system and are also shown on the piping and instrumentation diagrams. The pipe is usually made of carbon steel and is run to an underground sump, where it is eventually pumped out. 

PE is used in low-pressure water systems, such as golf course sprinklers, for corrosive liquids and gases, in underground conduits, and as gas pipe re-liner. It is also used in industrial and chemical laboratory drainage systems, and for undergroimd gas piping. 

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