Plumbing test. TTK. Hydraulic testing of pressure polyethylene pipelines

The cheapest offer, which, in comparison with others, does not meet the technical and operational requirements of the investor, often cannot be considered the most profitable. It should be emphasized that this aspect is subjective, depends on many operational factors that can vary significantly from one operator to another, so they cannot be generalized. For greater accuracy, plumbing analysis was preferred for sewers, since it is well known that sewer failures often escape the operator's attention - they are less visible from the outside, not detected by a detectable device, often not connected to a 24-hour control station, etc. 860 km of water supply.

From this analysis it can be seen that the failure rates for iron, plastic and steel are almost the same in a controlled location. However, the age factor of the pipeline must be taken into account. This comparison is no longer advantageous for plastics. An informative overview of the age of the pipeline under evaluation is given.

With a high degree of correctness, it can be argued that in the case of plastic water pipes poor quality pipes due to technological failure during pipeline laying - defects in the base, breakage and backfill associated with insufficient compaction of individual layers, is by far the most common cause.

In this way, the stove is heated by a column of soil, and the additional force is taken from the sitting soot on the sides and concentrated. The decisive value in this case is the tensile strength of the oven - the so-called "peak force". There is no risk of deformation, but if the load limit is exceeded, there will be an immediate surge. By placing these pipes on a concrete base or stacking pipes in a trench, the risk of collapse is minimized. Therefore, for overall quality rigid pipe needs high sealing of the furnace base.

Elastic pipes: The elasticity of pipes reflects lower strength and circular stiffness. In this case, both the passive reaction at the fulcrum and the internal bending stresses in the furnace wall. The vertical load resistance is distributed between own strength oven and the strength of the surrounding backfill. This load distribution ensures safe storage even when mechanical stresses or storage conditions change over time. Pipe resistance does not directly depend on the loading method, no material import, concreting, etc. is required. From the above review, it is clear that beneficial features flexible plastic pipes most dependent on the quality earthworks compared to other materials.

So well-known manufacturer pipes directly affects the experience, responsibility and quality of the contractor's work. A decisive and priority need for all flexible pipe structures is the strict observance and constant monitoring of all prescribed technological procedures in the construction of buildings, especially in the field of earthworks. The design of the pipes is smooth, corrugated and ribbed. For the investor, the choice of the decisive size range of the offered range of pipes, including the complete assembly of fittings, as well as compatibility with other elements of the system, for example, connection with concrete shafts, simple connection of connections with other materials, additional connection of connections on previously built pipelines below.

In the case of smaller slopes, there is a gap leading to hydraulic defects. The insufficient deformation of the circular profile is due to the insufficient degree of compaction of the breaks, which must reach a degree that statically supports the thin-walled and flexible pipe structure. Optimal for the complete elimination of elastic pipes is 95% compaction, which is practically impossible to implement in practice. Circular circular deformations are undesirable from an operational point of view, because they lead to the loss of watertight connections, increase even more external pressure on the pipeline, degrade the hydraulic properties of the pipe and negatively affect the service life of the pipes. pipeline damage due to poor material quality: the required particle size of the incoherent material is required, but the substructure is often destroyed, so due to pressure overpressure sharp and rigid objects cause the walls of the coiled tubing to buckle and eventually push the object into the furnace profile. failure to meet the predicted slope: the low weight of the coiled tubing causes the pipeline to change its position in height when the side compartment is compacted if it does not have an anchor change.

In practice, the level of the deposited pipeline is often incorrectly checked on the base base, and not after the sealing of the side seal. A review of the work will also be carried out, including the submission and evaluation of test documents that show the quality of the construction. However, for plastic materials, it is also necessary to take into account their deformation over time. Pipe deformation is a process that begins at the moment the pipeline is filled, with the final deformation values ​​being reached after about three years.