Hdpe Pipe FAQ

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Hdpe Pipe FAQ2021-03-25T01:47:20+08:00
What is the warranty time for HDPE pipes and fittings?2021-03-09T03:22:20+08:00

Due to the use of 100% original raw materials, we guarantee that all pipes and fittings delivered to our customers comply with the ISO4427 standard or other relevant international standards. For all HDPE pipes, HDPE pipe fittings, we can provide 20 years of warranty for normal use.

What kind of fittings does PUHUI offer?2021-03-09T03:14:40+08:00

In addition to HDPE pipe, PUHUI also supply complete fittings, including: dn20-110mm socket welding fittings, dn63-800mm butt welding fittings, dn20-630mm fused fittings, dn20-110mm PP compression fittings.

What is the meaning of SDR?2021-03-09T03:22:42+08:00

SDR stands for the size ratio, which is the average outer diameter of the PE pipe divided by its minimum wall thickness. The use of SDR enables manufacturers to produce a standard set of DR pipes. SDR includes 11,13.6, 17, 21, 26 and 33.

Why is the fusion joint better than the gasket joint?2021-03-09T03:22:50+08:00

A fused connecting pipe can be considered as a continuous pipe without a joint. On the other hand, gasket joints are a source of leakage and water loss in many water systems. If the gasket is not properly installed, if the gasket does not properly lubricate the gasket, if the gasket is not properly lubricated, if a negative pressure (vacuum) occurs in the pipe, if ground movement or bottom groove consolidation occurs, if a significant thermal change occurs, or if the gasket burns out due to surge pressure, a leak may occur. So weld joints are generally considered to be superior to gasket joints to prevent leakage.

Should I use butt or electric fusion welding to join the HDPE pipes?2021-03-09T03:23:07+08:00

It depends on the size and type of your project and the location of the installation. You must consider:

  • Peripheral area for pipe welding and installation – for smaller, more compact spaces using field welding, electric fusion welding is better.
  • The size of the pipe. The fused system is only suitable for systems ranging from 20mm to 710mm, while butt welding can perform systems up to 2000mm.
  • Training, certification and experience will also affect your decision. The preparation of the pipe for the two fusion methods is a meticulous manual process, however the welding itself is the biggest difference. Electric fusion welding can be a more automated process using a welding machine with parameters that are suitably fused. Butt welding has more manual components in the process.
What are the standards for PUHUI pipes and fittings?2021-03-09T03:23:37+08:00

We produce HDPE pipes and fittings in strict accordance with the domestic GB / T 13663 standard. JUNNUO HDPE pipes and fittings are fully compliant with UL, ISO4427, EN12201, AS NZS 4129/4130 standard and CE certification.

Does the HDPE pipe have certain soil requirements?2021-03-09T03:24:02+08:00

HDPE pipes are known for their flexibility, toughness and chemical resistance. PE pipes have excellent ductility and toughness, can withstand large pressure changes. These performance characteristics make PE pipes the best choice for dynamic soil and earthquake prone areas that require rugged, durable and corrosion-resistant piping that is flexible enough to be installed and assembled in harsh and challenging environments.

What is PVC ?2021-03-09T03:24:22+08:00

PVC is a thermoplastic derived from chlorine (from industrial grade salts) and carbon (mainly refined from oil/gas). Compared to other polymers, it is less dependent on non-renewable crude oil and natural gas, so PVC is considered a natural resource-saving plastic compared to oil-dependent plastics such as PE, PP, PET and PS. Chlorine imparts excellent fire resistance to PVC: When PVC is on fire, the flame will extinguish itself due to the self-extinguishing properties of the material.

What is the main application of PVC pipe?2021-03-09T03:24:42+08:00
  • Municipal water supply and sewer transport
  • drainage
  • Gas pipeline
  • Irrigation pipe
  • Wire conduit
Is the service life of PVC pipe long?2021-03-09T03:24:42+08:00

Yes, research on PVC pipes manufactured and used continuously in Europe in the 1930s shows that these products have a service life of up to one hundred years or more, which often exceeds the service life of the structures they are installed in.

In addition, PVC has an impressive long-term durability record. When water utility managers and engineering companies surveyed in a study sponsored by the American Hydraulic Association Research Foundation, they used corrosion resistance, longevity and durability as the main reasons for choosing PVC. PVC is ranked first when these same water professionals are required to compare PVC to other common types of pressure pipes. [Come from: Moser, AP and Kellogg, Kenneth G., “Polyethylene (PVC) Pipeline Performance Evaluation”, AWWA Research Foundation, Denver, Colorado, 1994.

Can PVC pipe products be recycled?2021-03-09T03:24:42+08:00

Yes, they can. Due to the long service life of PVC pipe products, there are not many pipes currently in use because they are still in use. Although current standards generally do not allow recirculating used pipes to new certified pipes. PVC pipe producers can recycle almost all production waste internally. Since PVC is a thermoplastic PVC pipe, it can be simply regrind, comminuted and returned to the extrusion process to make new pipes.

Is PVC pipe easier to install than other materials?2021-03-09T03:24:42+08:00

Compared to many alternatives, PVC pipes are a lightweight but strong material. A length of PVC pipe will weigh one-fifth the equivalent of the equivalent size of a cast iron pipe, making it easier to install. The product is easy to assemble into a solvent welded or gasketed version, once assembled correctly, both are leak-free.

What is the main difference between electrical fusion and traditional heat fusion?2021-03-09T03:25:24+08:00

The main difference between conventional hot melt and electrical fusion is the method of applying heat. In traditional hot melt (butt, saddle and socket) connections, heating tools are used to heat the pipe and fitting surfaces. The fused joint is heated internally or by a conductor at the joint interface or by a conductive polymer. Heat is generated when current is applied to the conductive material in the fitting. Electro-fusion joints are required for PE pipe-to-tube connections made using the electrofusion process.

What does “butt fusion” mean?2021-03-09T03:25:32+08:00

Electric fusion welding is the process of joining two plastic pipes together using a single-use coupler with integrated wire heating coils. The fused control unit supplies power to the coil, heats and melts the plastic. When cooled, a gas tight joint is formed.
When the electric heating coil is energized, the plastic material in contact therewith melts and forms an expanded pool of molten plastic that is in contact with the surface of the pipe. Continued heating causes the pipe surface to melt and then mix with the molten plastic of the fitting. This mixing is critical to producing good welds. Also, proper delivery of energy to the heating coil is critical to producing molten plastic and making the process happen.
At the end of the heating cycle, the fittings and pipes are cooled and the molten material is cured to form a strong and strong joint. During this cooling phase, the joint must remain completely stationary as movement can break the interface and cause a leak path.
In order to ensure a high quality joint, the following conditions must be met:

  • The heating coil needs to be as close as possible to the pipe/fitting interface.
  • The heat distribution is uniform over the length of the “hot zone”.
  • Precise control of melt pressure and temperature.
  • Protect the heating coil from damage before soldering and during soldering.
What is the maximum allowable depth of PVC pipe?2021-03-09T03:25:47+08:00

Stiffness is the property of the pipe, which defines their resistance to deformation under external loads, mainly vertical loads associated with buried pipe conditions. In non-stress applications, this is a basic property to ensure the correct performance of the installation. The allowable depth of burial is calculated according to the research test. PVC products have been successfully installed at depths of 50 feet or more.

Can non-excavation installation save the cost compare with open trenching?2021-03-09T03:26:09+08:00

Every day, more utility companies realize the advantages of trenchless technology. Due to cost savings, more trenchless projects are being installed than ever before. The savings are due to faster installation, faster licensing and saving design time, fewer commercial and residential disruptions, less park and tree damagement, and less interference with the road (and subsequent road maintenance).

What is the raw material brand you use?2021-03-09T03:27:58+08:00

Puhui only uses high quality PE80 or PE100 raw materials from world-renowned suppliers. The raw material suppliers we usually use are: Sinopec, Borealis and so on.

What is the difference between PE100 raw materials and PE80 raw materials? Which one is better?2021-03-09T03:28:17+08:00

The names PE80 and PE100 are based on the long-term strength of the corresponding material and are referred to as the minimum required strength (MRS). The minimum required strength (MRS) of the PE80 pipe is 8 MPa, while the MRS of the PE100 pipe is 10 MPa. PE100 raw material is an improved raw material than PE80, and its performance is higher than that of PE80.

How does the total cost of HDPE pipes compare to other materials?2021-03-09T03:28:24+08:00

Pipeline is a long-term engineering project. In addition to comparing the initial purchase cost, you should carefully evaluate long-term maintenance costs and overall life cycle costs. Since the PE pipe does not corrode and leak at the joint, the situation of continuous repair of the aged metal pipe or leakage with all other pipes at the joint will not be happened on PE pipes. Besides, initial cost savings are also achieved through the opportunity to install without trenching. Compared to other pipelines, HDPE has lower installation costs, lower maintenance rates, less water loss and lower energy costs. Therefore, HDPE has the lowest life cycle cost, and service life is 75-100 years estimated by Institute.

How is your after-sales service?2021-03-09T03:26:57+08:00

We have a professional technical service team and look forward to keeping in touch with you to provide you with a satisfactory solution for the HDPE pipe construction and installation technology.

Can the products be customized?2021-03-09T03:28:41+08:00

We can produce products according to your detailed requirements. Due to the diversity of pipeline construction, we produce various sizes of pipes and various fittings that meet the various construction requirement.

What are the advantages of using HDPE pipes?2021-03-09T03:28:48+08:00

The HDPE pipes are joined by the hot melt process. The joints form a solid and leak-free piping network with the rest of the tubing. The “allowable water leakage” rate of the HDPE pipe is zero, which is as high as 10% for other types of pipeline.

What can an HDPE pipe carry?2021-03-09T03:29:02+08:00

PE pipes can transmit drinking water, wastewater, chemicals and compressed gases.

What makes HDPE pipelines popular?2021-03-09T03:29:02+08:00

HDPE pipes are joined together by a unique hot melt process to form a seal that creates a powerful, leak-free system.

What is the HDPE pipe?2021-03-09T03:29:02+08:00

HDPE stands for high density polyethylene (still called PE), is made of ethylene, which come from crude oil or natural gas. HDPE pipes are extremely rugged and offer extreme durability, flexibility, corrosion resistance and chemical resistance.

How about your after-sale service?2021-03-09T03:29:13+08:00

Once everything is ready, we will contact you monthly, and we will give you the satisfying answers to the technical problems about the automatic equipment.

What is the difference between DR and SDR?2021-03-09T03:29:19+08:00

The terms “DR(dimension ratio)” and “SDR(standard dimension ratio)” are widely used in the PVC pipe industry. Both terms refer to the same ratio, which is a parameter that is obtained by dividing the average outside diameter of the pipe by the minimum pipe wall thickness.

DR and SDR were developed out of convenience rather than out of necessity. They have been established to simplify standardization in the specification of plastic pipe on an international basis. Since these define a constant ratio between outer diameter and wall thickness, they provide a simple means of specifying product dimensions to maintain constant mechanical properties regardless of pipe size. In other words, for a given DR or SDR, pressure capacity and pipe stiffness remain constant regardless of pipe size.

Even though the terms DR and SDR are synonymous, one minor difference between them is that SDR refers only to a particular series of numbers, i.e., 51, 41, 32.5, 26, 21, etc. This series of “preferred numbers” is based on a geometric progression, and was developed by a French engineer called Charles Renard. These numbers are often called “Renard’s Numbers.”

The term DR became widely used in 1975, with the publication of AWWA C900, which governs production of small diameter PVC pressure pipe. AWWA allowed the desired pressure capacity to dictate wall thickness. Since the OD/t values generated did not happen to fall on any of Renard’s Numbers, AWWA removed the “standard” designation from the SDR term.

It is interesting to note that the most widely used product for small diameter sanitary sewer in the U.S., ASTM D3034, SDR 35, provides an apparent contradiction in terms. While 35 is not a Renard Number, it is still referred as a standard dimension ratio. In fact, all OD/t ratios in D3034 are listed as SDRs whether they are included in Renard’s “preferred numbers” or not. This was probably for convenience’s sake. D3034 was written in 1972, prior to the popularization of the DR term. Accordingly, ASTM may have allowed all OD/t ratios to be called SDRs.

The bottom line is simple: the two terms are interchangeable. SDR=DR=OD/t.

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