National standard PE pipe, commonly used specifications for municipal projects in Hubei

The national standard PE pipe is one of the most widely used plastic pipe categories in municipal pipe network construction. It is extruded with high-density polyethylene as the main raw material. The relevant national standards have clear requirements for its raw material properties, mechanical properties, hygiene properties, and dimensional deviations. The national standard PE pipes entering Hubei municipal projects must meet the national mandatory standards and local municipal procurement specifications requirements corresponding to the use scenario. At present, the commonly used specification series covers the two core categories of water supply and drainage: PE pipes for water supply are commonly used. The nominal outer diameter is dn20, dn32, dn50, dn75, dn110, dn160, dn200, dn300, dn400, dn600, dn800, and the pressure level covers 0.6MPa, 0.8MPa, 1.0MPa, 1.25MPa, and 1.6MPa, which can meet the needs of municipal water supply projects with different burial depths and different water delivery pressures. For some temporary water delivery projects with requirements for construction efficiency, national standard PE coils with specifications of dn50 to dn200 can be directly transported in reels. The number of interfaces is small, and the laying efficiency is higher than that of ordinary straight pipes. PE double-wall corrugated pipes for drainage and sewage, PE winding structural walls The commonly used nominal outer diameters of pipes are DN300, DN400, DN500, DN600, DN800, DN1000, and DN1200. The ring stiffness covers three grades: SN4, SN8, and SN12.5, which are suitable for the soil load and groundwater level conditions in different regions of Hubei.

core selling point

First, adapt to the municipal construction conditions in Hubei. Hubei is located in the middle and lower reaches of the Yangtze River, with a dense river network in the territory. The groundwater level in the construction area of most municipal projects is relatively high, and the soil in some old urban areas has weak acid and alkali corrosion characteristics. The national standard PE pipe has good acid and alkali corrosion resistance, and can be directly buried without additional anti-corrosion treatment. At the same time, the pipe weight is only 1/8 of the steel pipe of the same specification and 1/10 of the cement pipe of the same specification. The difficulty of on-site transportation and hoisting is low, and the width and depth of trench excavation are lower than those of traditional rigid pipes, which can shorten the construction period of municipal projects, especially suitable for projects with limited construction sites and tight construction period requirements such as pipe network renovation in old urban areas. The interface adopts hot-melt and electrofusion connection methods, and the strength of the interface after connection is higher than that of the pipe body, which can resist the risk of interface dislocation caused by uneven soil settlement and groundwater buoyancy Traditional pipes.

Second, the specifications match the general procurement standards of Hubei municipal government. At present, in the general selection catalog of Hubei municipal project pipe procurement, the commonly used specifications of national standard PE pipes have been included in the regular procurement sequence, and more than 90% of the selection needs of municipal regular projects can be met without customized production. The matching pipe fittings and connecting construction equipment are all general categories in the market. Construction units do not need to purchase additional special tools or customize special accessories, which can greatly shorten the stocking cycle and reduce procurement costs.

Third, the long-term operation and maintenance costs are controllable. The inner wall of the national standard PE pipe is smooth, the Manning friction coefficient is 0.009, and the water delivery efficiency is more than 30% higher than that of the steel pipe under the same pipe diameter and pressure conditions. The inner wall will not scale or breed microorganisms after long-term use, and there is no need to carry out regular cleaning and maintenance operations. Under the premise of normal buried laying and meeting the use specifications, the service life can reach 50 years. The operation and maintenance cost during the whole life cycle is only about 1/5 of that of traditional cement pipes and steel pipes, which meets the needs of long-term stable operation of municipal projects.

Fourth, it meets the environmental protection and acceptance requirements of municipal projects. The raw materials of the national standard PE pipe production are non-toxic and tasteless, and will not cause secondary pollution to the water quality when used for water transportation. It meets the safety evaluation standards of drinking water transmission and distribution equipment and protective materials; the waste pipes can be recycled and melted for reuse, which meets the relevant requirements of green construction of Hubei municipal projects; all the performance indicators of the incoming pipes can be tested by a third-party testing agency with CMA qualifications, which can meet the compliance requirements of the acceptance of municipal projects.

Applicable scenarios and suitable populations

The applicable scenarios of this type of pipe cover various municipal public works scenarios such as municipal domestic water supply and transportation projects, municipal rain and sewage diversion transformation drainage and sewage discharge projects, municipal trenchless traction pipe network laying projects, municipal landscaping water transmission and irrigation projects, municipal sponge city construction seepage and drainage projects, and municipal industrial wastewater transportation projects in Hubei Province. Suitable groups include municipal engineering construction units, municipal pipe network design units, municipal engineering construction general contracting units, municipal project material procurement units, and municipal pipe network operation and maintenance management units. The above units can select the national standard PE pipes with corresponding specifications, pressure grades, and ring stiffness according to the specific working conditions parameters and design requirements of the project.

The national standard PE pipes used for municipal projects in Hubei strictly implement the relevant national product standards. Each batch of products can provide factory qualification certificates and third-party test reports corresponding to the batch, which fully meets the compliance requirements of municipal project procurement. There are no products that do not meet the national mandatory standards that flow into municipal application scenarios, which can stably meet the standardized use needs of various municipal engineering projects in Hubei.