Friday, June 25, 2010

Method of trenchless pipe made of PEX with an excavator

Laying pipes in old pipelines with an excavator
1-old pipe, 2 - PEX pipe, 3-Nylon Stick 4-movable roller; 5-nose-cone.

Laying pipes in older pipelines is an upgrade of the old pipeline systems. However, it is important to have a complete understanding of the forces and stresses experienced by the pipe during installation.

This shows how installation of PEX tubing with an excavator. Pre-boiled whip of the PEX pipe is placed on the mobile videos. At one end of the pipe or welded, or with a bolted connection, fixed nose-cone.

The end of the pipe with a wound in the nose cone of the old pipeline. On the PEX pipe is fixed one end of a nylon elastic stick, the other end is attached to the tooth bucket excavator. Smoothly, without jerks, gradually whip is drawn into the old pipeline.

With the introduction of PEX pipes in the existing pipe outer surface of PEX may be damaged, eg scratched, if not to take special measures. These measures include the removal of burrs and sharp edges with the existing pipe inspection using CCTV and the protection of new pipe in the area of administration, particularly in the area it traverses the trimmed edge of the old pipe. Care must be taken so that the depth of the scratches did not exceed 10% of wall thickness. It is therefore recommended to use PE pipes with wall thickness of not less than 5mm.

Tuesday, June 15, 2010

Scheme of PEX Tubing distribution

The scheme of PEX Tubing distribution of air noise from the sewer with a hard pass through the overlap

1 - floor 2 - arrows denote the sound waves - sound 3 - chief wall, 4 - sewage risers, 5 - Fixing collar; 6 - decorative wall panel, and 7 - rigid (concrete) incorporation
The scheme of distribution of air noise from the sewer with an elastic pass through the overlap

The scheme of PEX Tubing distribution of air noise from the sewer with an elastic pass through the overlap

1 - floor 2 - decorative panel, wall, 3 - sewage risers, 4 - Mounting clamp, 5 - chief wall 6 - Arrow denotes the sound wave - noise, 7 - rigid (concrete) incorporation, 8 - elastic sealing
The scheme passes sewer bypass pipeline and riser through the partition and overlap

The scheme passes PEX Tubing and riser through the partition and overlap

1 - risers, 2, 5 - sealing the passage, 3 - floor 4 - outlet pipe 6 - Wall

PEX pipe plus

As noted above, in the literature these issues almost no personal attention. The need to equip piping liners at the intersection of individual elements of the buildings can be justified by several factors.

Straight sections, such as risers from PEX pipe (PEX Tubing) are very sensitive to temperature changes and are able to significantly move. It is obvious that there must install the cartridges. This will create conditions for free movement of pipelines in the case of thermal strains at the possible installation and maintenance, seasonal and diurnal temperature extremes. However, we can not prevent movement of polymeric PEX pipe in the construction elements of buildings. To do this, arrange them joints so as to completely exclude the movement of polymer pipeline construction elements.

PEX pipe for you

However, significant noise sources are the other internal PEX pipe [2]. The corresponding arrangement [3, 4] permits such as sewer PEX pipe through the building structures (Fig. 2, 3 and 4) can significantly reduce the noise emanating from them (the noise level is reflected in the figures the number of arrows). Thus, the study of certain regulations convinces us that the consensus about the mandatory requirements for the arrangement of passages is not yet formed. This is understandable, since the conditions of the intersection of metal and polymer PEX pipe are very diverse: they are material building elements (concrete, brick, wood, etc.), and the various elements (load-bearing walls and walls of living rooms, bathrooms and basements, as well as the overlap ). It is important, and what elements (walls, floors, etc.) traversed by the pipeline, in which the premises is carried out (bathroom, living room, etc.) and what a way to mount (indoor or outdoor) is used. It is from these factors in each case will depend on the criteria for cost-effective arrangement places the intersection, execution of which alone would ensure a reliable and durable operation of any sanitary system from any of the PEX pipe.

Internal PEX pipe systems

These issues are due to the fact that it is always important to know how the simpler, cheaper and more reliable for trouble-free service elements of buildings and pipelines to equip their intersection with the building designs. The analysis of numerous regulatory and literature data does not permit a sufficiently convincing answer to these questions.

Thus, in SNIP 3.05.01-85 ("Internal sanitary systems) - the basic document on the rules of national importance installation of internal systems - there are no recommendations on the arrangement of the pipeline goes through the elements of the buildings, except the following:" non-insulated pipe systems, PEX radiant heating, radiant heat, domestic hot and cold water should not adhere to the surface of building structures ", and" distance from the surface of plaster or lining up the axis of uninsulated PEX pipe with a diameter of nominal bore 32 mm inclusive, in the open strip should be between 35 to 55 mm, diameter 40 -50 mm - from 50 to 60 mm in diameter and 50 mm - was adopted by the working document. Do not reflected sufficiently rules of crossing the elements of buildings and pipelines in the national norm SNIP 2.04.01-85 ("Internal plumbing and drainage of buildings") on the design standards of domestic water and wastewater systems of buildings. Section 17 provides guidance, according to which:

* Aisle seats risers through floor should be sealed with cement mortar to the entire thickness of the overlap (n. 17.9g);
* Riser section above the floor at 8-10 cm (up to horizontal diverter pipe) should be protected by cement mortar thickness of 2-3 cm (§ 17.9d);
* Before burying solution riser pipe should be wrapped roofing waterproofing material without a gap (clause 19.9e). However, this statement applies only to the risers sewer systems. Consideration of various regulatory recommendations on arrangement of the pipeline crossing elements of the buildings shows that they are very incomplete and, moreover, are sometimes contradictory.

Tuesday, June 8, 2010

Types of PEX tube connections

Today the market in a variety of fittings are presented for metal systems. Talking about how adherence to the tube should be divided by all the fittings on the screw (threaded) and media (press fitting).

In the first case the connection is achieved through the pressure that arises when tightening the nuts on an open ferrule. The figure shows the device of one of the threaded fittings company Pex Al Pex . To seal its tip has a special retention profile with the radial notch and the two O-rings, immediately adjacent to the pipe. Tight connection fitting body with a tip is a special seal. Another gasket is placed between the tip and the end of the pipe. This piece, which eliminates direct contact of the aluminum layer with a metal fitting and thus prevents the electrochemical corrosion, it is usually made of Teflon. As the seals are also recommended teflon gaskets.

As already mentioned, mounting screw connection does not require a special tool: it is made with two wrenches (one nut is tightened, and the second is resistance). To facilitate the introduction of the sealing rings and extend the life of the fitting, use silicone grease. It is prohibited to use mineral oil or other petroleum products. Typically, grease is a range of products produced by manufacturers of PEX pipe.

Installation of PEX tubing

Today in the heating, hot and cold water pipes are successfully used, made of polymer materials or using them. In previous issues of the journal "Everhot" commented mostly on technologies based on the use of flexible pipes made of crosslinked polyethylene (PEX). At the current market of engineering equipment with this product compete vigorously Aluminum pipe. To speak clearly about the advantages of the latter can not, although it is known that a number of reasons, including - psychological, USA customers often prefer the PEX plastic.

An important quality of PEX pipes is their adaptability for installation. They are easy to bend, do not require exact fitting of linear dimensions, with no extras save the form, which gives them the installer.

Major foreign companies, manufacturers do not release PEX pipe themselves, and lead integrated production related equipment: reservoirs, fittings, fasteners, etc. Connect and the connection of pipes with special fittings does not require threading or welding and the application does not take much time.

Specificity of metal-tube requires careful handling it, strict observance of assembly technology. This is especially important because in most cases, the rules require a hidden strip of PEX pipe, where a bad leak is extremely undesirable.

Friday, June 4, 2010

PEX Couplings

PEX fittings are vital to ensure the installation of the PEX tubing systems. One of the most important fittings is the PEX coupling that is increasingly being used to connect the ends of various PEX piping. PEX couplings are of utmost relevance when it comes to connecting the PEX tubing systems.
The most commonly used materials for the PEX couplings are plastic and brass. Out of these two types, plastic PEX couplings are primarily used to check the pressure. The main purpose of PEX couplings is to ensure secure installations by bending tight corners, changing sizes and splitting branches. Straight connectors are the most basic types of PEX couplings that are increasingly being used to various connections of toilets and faucets.
There are basically two types of connections that are being used which include the crimp connection and clamp connection. Copper crimp rings and crimp tools are used for the crimp connection, whereas, clamp tools and stainless steel clamps are used for the clamp connections.

Tuesday, June 1, 2010

Stiebel Eltron or Takagi?

Saving water heater - this is, simply speaking, the expansion tank, which is installed heater and protective anode for the prevention of scale. Average power storage water heater of about 1.2 - 3.0 kW, and it is perfectly suited to the requirements of our power. As for the cost, it is determined by the volume of container and the name of the manufacturer. Average price - Italian Termex and Isea (from 70 to 500 ye). More expensive water heater will cost you from Rheem, Stiebel Eltron, and Takagi (Japan). Their value of 200 y.e and above. The principal difference between expensive and cheap is not just in English and German heaters plenty of space is insulated (due to its water loses only 5 degrees per day), and they are covered with expensive titanium enamel.

The more expensive model, the more it needed technical functions. For example, quick radiant heating (when the water cools to 0.5 degrees, turn on automatic radiant heating).

Before you buy a water heater, you should determine for what purpose you will use it. If you only want to wash the dishes, then you have enough water heater to 10 -15 liters. To take a shower - no less than 30. For the needs of a large family of at least 100 liters. Note also that the majority of storage heaters work under pressure, they are called artesian. There is also the so-called liquid - water, they poured directly into the tank, and they are designed for one faucet (sink).
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