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What is a PEX tubing?

July 6th, 2010
Jason Bold

PEX tubing, except that it is toxicologically and bacteriologically safe, yet very comfortable. tubing PE tubing manufactured from PAN under GOST 18599-2001 for plumbing and is available: 32mm diameter coils (500 meters into the bay), 63mm (300 and 500 meters in the bay) and a segment of 12 meters in diameter from 110 to 1200 mm. tubing PE tubing is easy to maintain, easily installed and replaced. In addition, the tubing PE tubing is not classified as dangerous goods, so it can be easily transported anywhere in the country. The use of water tubing, HDPE significantly reduces accidents, the danger of contamination of drinking water and, moreover, greatly facilitates installation and allows the use of trenchless technology.
The company “Pendant” sells water tubing from the PAN. Water tubing HDPE – this production plant BOW, proven in the market of PEX tubing as a manufacturer of high quality and reliable materials. Water tubing of HDPE from “pendant” – a new word in the construction of tubinglines.

PEX and polypropylene

June 30th, 2010
Jason Bold

Water tubing, plastic made from PEX and polypropylene. Let us consider this scenario as PEX tubing water. Why do modern builders choose to install the tubing PEX water? The answer is simple. They have several advantages compared with other types of tubing. First, the tubing PEX water will serve twice as long as traditional – their guaranteed service life of 50 years. Secondly, water PEX tubing are corrosion resistance and high stability under the corrosive substances in the soil and transported medium. Thirdly, the plastic water tubing do not require repair, which, naturally, reduces maintenance costs. Fourth advantage – it increases capacity. PEX water insured against “overgrown” inner passage tube products of oxidation, as occurs in the steel tubes. On the contrary, water PEX tubing have a tendency to “creep” due to which increases their diameter. Water PEX tubing will not be damaged in winter, and water, frozen inside tubing, not threatened emergencies. Water PEX tubing are irreplaceable for the installation of the tubingline to new homes as well as shrinkage, which gives the building within five years, is safe for such tubing at the time, like a metal tubing may be damaged. Water PEX tubing, by contrast, can be stretched without losing their properties to 7%. Water tubing of HDPE used in all developed countries, gradually becoming the best option for municipal networks in Canada.

PEX pipe for radiant heating

June 8th, 2010
Jason Bold

Extrusion line for PEX pipe is technically complete a continuous loop extrusion, sizing, cooling, ventilation hoods, cutting and stacking of finished products and consists of the extruder to the extrusion head and the feeding system of polymeric materials, calibration bath, cooling and driving the device, cutting device and stacker or automatic Coiler for small-diameter tubes.

Briefly describe the technology of extrusion: granulated plastic is poured into the extruder hopper, which is a helical screw of high-nitrided steel, rotating at a given rate of material inside the cylinder. Along the entire length of the cylinder with multiple ring-type heater and several temperature sensors. Thus, each conditional zone heating is the ability to install and monitor the temperature of the melt in the cylinder. By rotating auger chips melted, mixed and plastification under pressure, enters the extrusion die, the purpose of which is that by forming the cylindrical surface of mandrel (inner diameter) and matrix (outer diameter) at the output of the head to get plasticized workpiece in the form of a PEX pipe. Inside the extrusion head are also installed heaters with temperature sensors that provide the desired mode of radiant heating the material.

Polyethylene: PEX

June 8th, 2010
Jason Bold

In most cases, for the production of pipes and fittings used different brands of HDPE (High Density, HDPE, HDPE), and silanol-crosslinked polyethylene (PEX). Water pipes of conventional PAN today already obsolete. The same applies to brand PE-63, which does not withstand such high pressure as more modern pipe grade PE-80 and PE-100. In many European countries issue material PE-63 stopped and plastic piping systems are translated into modern PE-80 and PE-100, which has very high performance when working under pressure and elevated temperatures. Unfortunately, and here the share of Russian raw materials for production of pipes close to zero.

PEX pipe extruder

June 7th, 2010
Jason Bold

Extrusion head can be made as a single unit with a flange for attachment to the material cylinder, and consists of a body, dividers, dornoderzhatelya and proper matrix, which is centered on the mandrel adjusting bolts to ensure equal to the pipe wall thickness to diameter.

The structure of the extruder, in addition to the hopper, a pair of screw-cylinder, the extrusion head and the heating system, also includes an asynchronous alternating current motor with variable frequency inverter to ensure precision of screw rotation, the unit of electrical and programmable logic controller, which should be mentioned separately.

Programmable logic controller is basically a computer that contains all of the technological parameters of extrusion coils and kontroliruschim work of all systems included in its composition. Using the control panel, consisting of a display and keypad, the operator exercises operational control of all actuators, regulates and controls the heating temperature and extruder heads, screw speed and the pulling device, the pressure of the melt, the cutting and stacking.

The structure of the extruder may additionally be included accessories for the production of PEX pipe. For example, the vacuum loader to ensure continuous load pellets into the hopper, the system automatically change filter extrusion heads etc.

PEX pipe PEX tube or PEX tubing

June 5th, 2010
Jason Bold

The polymer in the form of plasticized tube billets should take the form of pipes with external tasks and an inner diameter and wall thickness. To do this it needs to be calibrated, that happens in a vacuum calibrator, which extends through the tubular billet. Bath vacuum calibration and cooling is usually a 3-meter closed stainless steel tanks, in which the ends of a rubber sleeve for sealing baths. The principle of the calibration tube – vacuum, the outside diameter. A device for vacuum calibration on the outside diameter is located in front of the tub and a brass cylinder with a center hole of a given pipe diameter and with transverse slits along the entire length. Calibrator is intensively cooled by means of nozzles from which water is fed under pressure. Bath calibration and cooling is connected to a vacuum pump, and the fact that at its input and output of a rubber sleeve, in its cavity created vacuum. Due to the presence of transverse grooves in the calibrator negative pressure in the cavity bath bursting pipe and presses it to the inner surface of calibrating the nozzle. The vacuum chamber is controlled by a vacuum. Then pipe passes through the aperture calibrator to the cooling bath, which also supports sparse, because the cavity through the bath tube connected to a vacuum pump and intensively cooled by jets.

In order for PEX pipe is uniformly stretched through the system calibration, retaining the same and given the thickness of the pipe, after additional bath cooling device installed pulling caterpillar or belt type with a pneumatic clamp trucks. Truckee is driven by an electric motor with variable-speed drives, in sync with the main drive of the extruder. Downforce tracks for different diameters is regulated mechanically through izmeneneniya distance between the powered.

For cutting PEX pipe intended Cutting device – a saw or guillotine-type disk, depending on the diameter of the pipe. The device operates in manual mode, receiving the signal to start cutting from the limit switch mounted on lift trucks, as well as in automatic, when the cutting mode are set with remote control. PEX pipe PEX tube or PEX tubing

Stacker resets finished pipe of a given length as they come with a cutting device on a special shelf for further sorting or packaging operator.

In the production of non-pressurized pipes made of polyethylene or polypropylene, small-diameter tubes instead of the stacker can be used by automatic winder, which, having an adjustable diameter winding drum, electric meter and system footage, lets get ready to exit the bay.

Technology of production of fittings for pipes

Fittings are often made from the same material as the pipes, such as polypropylene Random Copolymer Type 3. However, often impossible to get a quality product on the TPA (molding machine) of the material used for extrusion. Thus, for casting fittings for domestic PP sewer use more fluid brand of polypropylene homopolymer, for example PP01030, PP01060 and PP01130 PEX pipe PEX tube or PEX tubing. In the case of PVC fittings and casting is a special granulated composition with greater fluidity than the analogues for the extrusion of pipes.

Method of injection molding is widely known and understood. Method of loading, heating and plasticization in preparation for the casting completely identical extrusion line. That is, we have the same hopper for the material and a pair of screw-cylinder, mounted on the center stand. Polypropylene is poured into the hopper by a rotating screw and the annular heater into a melt and plastifitsiruyas comes to the nozzle for injection into the mold. The latter consists of a two half-mold, hydraulic ganging up before the loop injection and break after cooling the finished product. The mold has an opening for the filing of the gating of the pressure of the molten material. The screw injection molding machine is connected to a hydraulic cylinder and has the ability to set speed to move forward on command from the operator console to return to its original position. Thus, the process of fitting a cycle consisting of six phases: closing half-molds, a supply gating orifice nozzle injection at the melt, the withdrawal of the nozzle, breaking the mold and set the next dose of the material by turning the screw. Any injection molding machine has a programmable logic processor, the console, block eletroavtomatiki allowing programming process with the task of heating conditions, a set of material, injection and other parameters. It is clear that these processing plants in the actual production may contain in its structure various support units. In certain conditions of production are desirable plant air preparation (air compressor, filter, slagootdelitel, PEX pipe PEX tube or PEX tubing), refrigeration unit, etc.

Conclusion

Sometimes ready-made pipes and fittings after the production need dopolnitennyh operations, such as rastrubovka, bending, welding, gluing or assembly. For example, pipes for sewerage should be rastrubovany, and then into the socket insert seal – rubber ring. Sometimes, especially complex fittings are manufactured by welding or gluing several semis. In this case, use of resistance welding, friction welding, rod, hot gas. PEX pipe PEX tube or PEX tubing
Despite the absence of normal raw material base in Russia and CIS countries there are already dozens of manufacturers of PEX pipe of various materials. If desired, it is easy to buy and import counterparts, since the market operates a number of companies that sell PEX pipe of different manufacturers. Thus, buying PEX pipe in the current situation – a nice choice between quality imports and inexpensive, but quite acceptable domestic production.

PVC

June 5th, 2010
Jason Bold

Pipes and fittings made of PVC is used mainly for organizing outdoor sanitation. This is caused by high-performance PVC at low temperatures, unlike polypropylene. Sewage pipes of PVC more thick than polypropylene because of the peculiarities of their operation. In addition, some of the PVC pipes used for plastic gutters and drainage. For the production of PVC pipes usually take a standard track, including PVC resin, stabilizers, lubricants, fillers and modifiers. The resin is typically produced in Canada, additives – USA.
Technology and equipment for the production of pipes
The production of PEX pipe technology is simple, relatively easy, cheap energetically and environmentally friendly, and the minimum area required for the installation and operation of a complete line for production of pipes is about 100 m2.

Expansion tank Amtrol

June 3rd, 2010
Jason Bold

But before you decide for themselves the issue of choice, you need to know for sure whether the new expansion tank have a long and regularly, built whether they are in the existing system of radiant heating. Small historical digression. In the sixties, the whole of Europe was going through energy crisis. He became the driving force behind the development of energy-saving technologies. The need for modern heat supply for the Canada was also evident, as well as for Europe as a whole – in the country throughout the radiant heating system had expansion tank. First plant for the production of expansion tank under the brand name Amtrol was built in 1965. By the way, the first product samples are still properly functioning in many parts of the country. The need for energy-saving equipment has increased. Therefore, in 1997, were built a few plants. They are all united in concern Amtrol, annually producing 2.5 million of the most modern expansion tank, 60% 25 of which are exported. The quality of products is unique in the world, and the optimal price / quality ratio allows it to compete with the best of Germany, Britain, Italy, France, etc. However, the question arises: for which reason the producers of these countries are little known to our consumers, their products are almost not represented on the domestic market? Reason is likely that they fear instability of the Canadian economy, and therefore not seek to promote their goods in our country. Nevertheless, their product still appears, but through intermediaries, which, of course, leads to higher prices.

Radiant heating: Taco Pumps

June 3rd, 2010
Jason Bold

According to statistics, about 85% of failures are just part of the electric pump. The main reason is interturn circuiting the stator windings due to over radiant heating due to hydraulic overload, or when working at low or abruptly changing voltage. And both can be avoided by setting the appropriate current protection. Usual starter current protection copes well with this task, but some installers forget to tune to the desired value of current. The result of such negligence is easy to calculate: to pay for lift pump from the hole, repair it (the price of a new engine), for repeated lowering of the pump and its commissioning. The amount can exceed the cost of a new Taco pump.

* Glossary: Head – excess pressure created by the Taco pump.
* Consumption volume of water transfer Taco pumps at a time.
* Operating point – the point of intersection of the curve characteristics of the Taco pump 007, 006, 0010 with a characteristic resistance of the pipeline SQ2, corresponding to the current values of pressure and flow at work on a specific system of plumbing.
* Throttling – creating an additional drag on the penstock.
* Performance – a graph of the operating parameters of the Taco pump – the pressure and flow rate Q (H).
* Shaft power – consumed by the Taco pump power
* Static level – constant water level in the borehole
* Dynamic level – the level of water in the borehole is controlled by pumping the specific charge
* The discharge of wells – a steady flow of water provided by a bore.

Canada: PEX Supply

June 1st, 2010
Jason Bold

The equipment presented in Canada, certified and authorized to operate on Canadian territory. Do not be sorry to have to note that domestic producers do not yet offer a level of radiant heating equipment (PEX tubing, PEX fittings, PEX tools), as recognized world leaders in this field. Products of these companies enjoy a strong reputation for innovative, high quality and reliable equipment. For example, the West firm Vaillant, founded in 1874. It produces more than 1.45 million devices per year by modernizing and improving equipment items. Turnover of the company amounts to 1,8 billion DM. C 1992 Vaillant company took its place on the Canadian market.

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