Build Daily

Engineering Systems

August 12, 2017 18:08

Metal casing and plastic pipes for water wells

Steel casings are time-tested

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mass migration of citizens to private vacation homes has created a lot of interesting offers on the market of construction and installation works.Drilling water wells can rightly be attributed to this category.How to make a hole in the country we are discussing now turn our attention to the important technical details: choosing the right casing for this vital source of drinking water.

The first thing that must take into account the future owner of artesian wells - the warranty period of its operation.Believe me, drillers pay twice the money for poor quality performed work is very expensive.Metal casing uniquely standardized building codes and regulations when similar equipment engineering structures (see. Item 2 SNIP 2.04.02-84).fastening method may be grooved (threaded) or welded, but the technical details of installers decide on the spot.A reasonable question arises: Why steel?

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  • results of years of endurance tests in the wells depth of 50 - 300 m;
  • acceptable corrosion rate in the corrosive aqueous media and soils - 0.1 mm in wall thickness of the metal casing to 5 mm;
  • absolute integrity and reliability intertubular compounds;
  • guaranteed axial alignment of the assembly;
  • mechanical strength of the metal tube in difficult terrain and occasional strains.

rules installation of metal casings are governed by many regulations, but in the domestic engineering networks enough to use GOST 632-80.

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price of casings for

well admit that the economic component of the aquifer drilling wells for the majority of our fellow citizens, too, plays an important role.Draw a simple comparison.Metal casing of the material will cost you approximately 1000-1100 rubles.per meter (with a diameter of 120-130 mm).Polymer analogue would cost four times cheaper - 230 rubles.Please note that the plastic build on this indicator definitely win the dispute, and the technical side of the issue, we will discuss below.

should not be forgotten that the financial component of the casing should include not only the price themselves steel or plastic pipes, but also the cost of installation, maintenance and possible replacement.For steel obsadok timing of such repair work has long been identified for plastic are in the process of ground tests.

As a result, we have the usual dilemma: to make the casing design quickly and cheaply, or build water-supply system is thorough but expensive.The choice is difficult, especially given the negative feedback about the performance qualities of the plastic casing on the well.

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plastic pipes for wells: the pros and cons

Usually it is a product of HDPE (high density polyethylene) and PVC (polyvinyl chloride).These work well in many piping systems (water supply, sewerage), but the possibility of their use in the feed system, borehole abstraction requires a separate discussion.

Plastic pipes have a number of obvious advantages:

  • high plasticity of the material, to the linear deformation resistance;
  • low coefficient of thermal expansion;
  • corrosion resistance, neutral response to the most chemically active substances;
  • optimal ratio in terms of "price-quality";
  • ease of installation, low specific weight.

list could go on, but to well conduits, all these fine qualities are irrelevant, because the casing must fulfill three basic functions:

  • withstand internal hydraulic pressure feed pump;
  • maintain leakage at ground deformation;
  • prevent the ingress of dirt and groundwater in the upper echelon of the pipeline system.

We do not undertake to assert that plastic pipes for drilling for water can not cope with these features, but the steel even when they seem expensive, we preferred.

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