What is the difference between dips and ips

CBs are typically used to improve UV resistance and to reduce or lower moisture absorption in pipe. Coefficient of friction : Coefficient of friction measures the amount of friction existing between two surfaces. As this measurement relates to piping, a lower coefficient of friction typically means less friction damage in piping example: outer layer wear.

To find the coefficient of friction fr use this formula:. Where Fr is the resistive friction force and N is the normal force pushing on objects. The safe peak pressure or allowed total pressure for HDPE pipe is 1. Derating is usually expressed graphically or in terms of derating factors.

HDPE piping loses its strength to pressure and tension as temperature is increased. FM approved : FM Approvals is a third-party testing and certification service. The five-step certification process includes product review, testing, and manufacturing facility audits. UL Rating : Underwriters Laboratories UL is a global safety science company and third-party certification company founded in The company tests products and technologies for safety.

Seismic loading : Seismic loading is one of the basic concepts of earthquake engineering which includes application of a seismic oscillation to a structure. It happens at contact surfaces of a structure either with the ground or with adjacent structures. According to an Electric Power Research Institute report Nondestructive Evaluation: Seismic Design Criteria for Polyethylene Pipe Replacement Code Case , there are two potential sources for seismic loads on the piping: loads from wave propagation in the soil and from seismic anchor motion of the buildings that form the boundary for the buried pipe.

Most of these definitions come from industry-recognized sources such as PPI. See below for a complete list of sources.

About United Poly Systems. IPS, 4-in. CTS for use in many industries including telecommunications, power utility, water, electrical and oil and gas. We also offer fully customizable HDPE conduit options. In addition, piping can be customized with a ribbed interior to maximize the distance cable may be pulled or jetted , pull tape, or a lubricated interior for easier installation. Success at UPS can be attributed to our vast experience, extensive client relationships, state-of-the-art manufacturing and quality processes.

IPS and 4-in. DIPS for use in many industries including telecommunications, power utility, water, electrical and oil and gas. PPI publishes a technical note, TN 38 that deals with this subject in considerable detail and with other options for flanged connections made between HDPE and other pipe materials. Common methods include slip-joint anchor fittings, gasketed joint adapters, and flange connections. Information on these systems may also be obtained from the pipe manufacturer.

Consult with your flange adaptor or mechanical-joint adaptor supplier to insure dimensional compliance. The bolts through the gland are evenly tightened in a star pattern to complete the MJ connection. As a result, there is a greater loss of compression and sealing capacity of the rubber gasket in the larger sizes. With the use of HDPE mechanical joint adapters, polyethylene pipe and ductile iron fittings are completely compatible. However, due to the flexibility and tighter bending radius that can be achieved with HDPE pipe, fewer fittings may be required.

HDPE pipe can be cold or hot under pressure tapped using piping products presently available. Saddle fusion tapping tees, electrofusion tapping tees, electrofusion corp saddles, and branch-saddles are readily available. There are several bolt-on mechanical connections qualified for use with HDPE pipelines as well. With this variety of fittings, tapping is a straightforward procedure. Service saddles often include double straps or extra wide straps and Belleville spring washers for use with HDPE pipe so that the tension on the strap remains constant once the nuts are properly torqued.

Tapped threads are not recommended for use on HDPE piping products. The industry standards for service taps to HDPE mains recommend the use of saddle fusion tapping tees, electrofusion tapping tees, branch-saddles, and certain metal mechanical clamps.

At this time, there are no known adhesives or solvent cements that are suitable for pressure sealing or that have sufficient strength characteristics to join HDPE pipes. Heat fusion, which includes butt fusion, electrofusion, saddle fusion and mechanical joints are the only methods for joining HDPE pipe.

Refer to the answer under question PVC pipe? Both are plastic materials requiring the same considerations for proper embedment and backfill. However, the particulars of the application may influence this somewhat. HDPE pipe does not undergo galvanic corrosion and therefore it may be safely installed in hot soils that would attack metal pipes and there is no need for cathodic protection. How does it compare to PVC pipe? HDPE can be cold bent to the dimensions shown below for a long term application based on the pipe DR.

Also, HDPE pipes may be bent to a tighter radius for a short term application, such as during installation. A tracer wire should be buried above the HDPE pipe at the time of installation to facilitate future location. If no metal wire was installed above the plastic pipe, ground-penetrating radar or acoustical resonance may be used. For larger sizes the inside diameter of the host pipe should be about 2-inches greater than the outside diameter of the HDPE liner pipe, but this depends upon many factors including deflection, sag, bends, obstructions etc in the host pipe..

When HDPE pipe enters or exits a manhole it is best to use a link-seal or a water stop also referred to as a puddle flange with sealing grout. The link-seal or water stop will prevent water from seeping between the pipe and grout.

This depends on several factors such as a comparison of the applied internal operating pressure versus the external pressure from possible external loads, including earth loading, hydrostatic loading and superimposed loading. But while grouting of the termination points of internally pressurized systems is usual, grouting of the entire annular space is not often required.

Irrespective, it is strongly recommended that the design engineer conduct an analysis of the project before deciding on the approach to this issue. The goal is, of course, to keep tensile stress in the pipe within allowable values for the pipe type and conditions. Maximum pulling length is a function of the tensile strength and weight of the polyethylene pipe, the temperature at which the pipe will be manipulated, the physical dimensions of the pipe, and the frictional drag along the length of the polyethylene pipe.

Pipe rollers are available to reduce the friction between the pipe and the ground and allow longer lengths to be pulled. How is it most effectively thawed? When water freezes solid in a HDPE pipe, it will not rupture it, but the pipe will expand with the ice. Obviously, the application of heat to the frozen section is really the only practical way to thaw it. But for safety considerations, and to avoid damage to the pipe, this must be done very carefully. One method is heat tracing.

This involves wrapping the affected area with pressure sensitive metallic tape over which is wrapped temperature limited o F maximum heat tracing tape. The metallic tape helps distribute heat evenly over the pipe surface.

Heat blankets are also available, however torches or arc welders should not be used to thaw HDPE pipe. Consult the pipe manufacturer for more details on this or other thawing procedures recommended for use with HDPE pipe. Generally, only small diameter HDPE pipes can be severed by excavation equipment.

More often excavator damage takes the form of kinking of the pipe. In larger diameters, the excavator cannot grip around the pipe or penetrate the thick wall. When external third-party damage does occur, there are several repair methods.

For small punctures, electrofusion patches may be utilized. For larger damage, cut out the damaged section, then insert a spool piece and connect it on each end to the exiting pipe using mechanical fittings, flange adapters or electrofusion couplings.

Depending on the extent of the damage full circle clamps may also be used as a temporary repair method. As mentioned in the answer to the previous question mechanical fittings can be used. There are several types on the market that work very well. Experience has shown that most mechanical fittings work best when used in conjunction with a stainless steel stiffener and restrainers.

If the ditch can be dewatered and the pipe dried off, fusion repair may be used. Otherwise a mechanical repair is recommended. The stiffener ensures compression of the gasket to the PE pipe. Yes, but a soft pig should be used. Refer to the answer under question 6. Like all products there are many reasons for why their pricing may change, raw material costs, supply vs.

And so if petroleum prices change so also does the price of the resin used to make the pipe. PVC and HDPE pipes are priced approximately the same when compared using the same basis; for example, using the same operating working pressure rating WPR and the same pipe outside diameters and the same minimum flow velocity of 5 fps, results in pipes with similar cost.

The costs of ductile iron pipe and HDPE pipe are comparable on a material basis before taking into account the advantages of installing the longer lengths, lighter weight HDPE product.

Additionally, the corrosion proof, leak proof and beneficial maintenance features of HDPE piping systems provide for a distinct and significant long-term cost advantage over ductile iron. There are now many different types of machines, sizes, models, and manufacturers to choose from in deciding to purchase a butt fusion machine.

Therefore, the best answer to this question is to consult directly with the fusion equipment producer or with the HDPE pipe and fitting distributor for advice and quotation. Check the PPI web-site: www. Case Histories. HDPE has been used for these applications for over 50 years.

After many years of field proven performance, it became a standardized material and product. PPI, and its membership, maintains an extensive listing of case studies and cities which have installed HDPE water transmission, distribution, and service tubing. HDPE pipe is available either in coils, reels or straight lengths joints. The coil may contain 1, or more feet of pipe. Longer lengths, i. Leak detection is a developing field with many technological improvements.

One of the most promising techniques is the audio technique, which listens for the sound emitted as the fluid flows irregularly through an unplanned opening in the pipe. HDPE pipe used in directional drilling must be designed to resist internal pressure, external loadings and pull back forces.

However, there are data available to assist the designer in making an appropriate wall thickness selection. HDPE pipe is the fastest growing pipe product in the water market. The percentage rate of growth in usage for HDPE pipe has been in the double digits for the last decade. Based on other pipe association annual reports, this is well above the growth rate of other materials, and is above the growth rate of the water pipe market itself.

HDPE pipe is widely accepted because of its corrosion resistance, zero-leak self-restrained fusion joint, durability, low maintenance and excellent long term performance history. In addition to the water market, the nuclear industry has adopted HDPE for its safety and non-safety related cooling water lines. As the polyethylene piping industry grew the need for a stand alone standard specification for pipe became clear.

The outcome was the development of ASTM D which was first published in and continues in use today as the only ASTM standard specification that applies to the selection of materials for use in the manufacture of polyethylene pipe and fittings. All prices are in USD. Compare Now. Please wait Toggle Top Menu.

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