Nkag siab txog PPR Pipe Specification

Kuv. Introduction of PPR water pipe

PPR (random copolymerized polypropylene) cev is a new type of environmentally friendly plastic pipe, nrog nws cov kub tsis kam, corrosion kuj, lub neej ntev (ntau dua 50 xyoo) and other characteristics, widely used in construction of hot and cold water systems, HVAC engineering and industrial fluid transportation field. Nws cov txiaj ntsig tseem ceeb suav nrog:

Safety and environmental protection: Non-toxic and odorless, in line with drinking water health standards (GB / T 17219).

Strong temperature resistance: Long-term use temperature of 70°C, short-term temperature resistance up to 95°C.

Pressure and corrosion resistance: No electrochemical corrosion problems, suitable for acid and alkali environments.

Convenient installation: Hot melt connection technology to achieve seamless sealing, to eliminate the risk of leakage.

2, the specifications of PPR water pipe parameters

1. Outside diameter and wall thickness

PPR pipe specifications to the nominal outside diameter (dn), common sizes include:

dn20 (4-minute pipe), dn25 (6-minute pipe), dn32 (1-inch cev), dn40, dn50, dn63 and so on.

The wall thickness (en) is calculated based on the SDR value and directly affects the pressure capacity (see SDR details below).

2. Kev ntsuas siab (PN value)

PPR pipes are divided into four classes according to nominal pressure:

3. SDR (Standard Dimension Ratio)

SDR (Standard Dimension Ratio) is the core design parameter of PPR pipe, defined as the ratio of pipe outer diameter (dn) to wall thickness (en):

SDR = outer diameter (dn) / phab ntsa thickness (en)

SDR value is smaller → thicker wall → the stronger the pressure-bearing capacity, suitable for high-pressure systems.

The larger the SDR value → the thinner the pipe wall → better economy, suitable for low-pressure scenarios.

Common SDR values and corresponding pressure ratings

3. How to select according to SDR?

1. Selection according to system pressure demand

High-pressure scenario (e.g. HVAC boiler room): choose SDR6 or SDR7.4 with large wall thickness and strong creep resistance.

Conventional residential hot and cold water: SDR 9 (PIB 16) can meet more than 90% of the demand.

Low-cost cold water project: SDR 11 (PIB 10) has the best economy.

2. Matching by temperature adaptability

High temperature system (≥70°C): low SDR value (e.g. SDR7.4) must be selected to avoid deformation due to thermal expansion.

Low temperature chilled water system: High SDR value (e.g. SDR 11) can be selected to reduce cost.

3. Reference to industry standards

National standard GB/T 18742: clear PPR pipe SDR series and size tolerance requirements.

ISO 15874: international general standard, applicable to export-oriented projects.

4, PPR water pipe installation precautions

Thermal fusion temperature control: 260 ± 5 ° C for the optimal fusion temperature, to avoid too high leading to carbonization of the material.

Socket depth: need to match the specifications of the pipe fittings (such as dn20 pipe insertion depth of 14mm).

Pressure test: 1.5 times the working pressure holding pressure test (≥ 30 feeb) tom qab installation.

PPR water pipe through the scientific design of the SDR parameter system, to achieve a balance between performance and cost. When selecting the type, you need to integrate the three elements of system pressure, temperature and budget, and prioritize the selection of high-quality raw materials in line with the national standard (such as Scandinavian Chemical RA130E) products. As a professional manufacturer, we offer a full range of SDR-specification PPR pipes and customized solutions to help customers build safe and durable piping systems.

Tus neeg muab khoom

Luoyang Datang Energy Tech Co., Ltd., Ltd. yog cov chaw tsim khoom thiab cov chaw muag khoom ntawm cov kav dej thiab fittings. Peb muab cov kav dej PPR, PVC cov kav dej, PE tub, thiab hauv pem teb cua sov kav thiab fittings rau txhua hom kav dej, nrog cov khoom zoo thiab cov nqi sib tw. Yog tias koj muaj lus nug txog cov kav dej thiab fittings, thov tsis txhob yig tiv tauj peb. Koj tuaj yeem nyem rau ntawm cov khoom kom tau txais kev sib cuag nrog peb.