Comprendre les spécifications des tuyaux PPR

je. Introduction de la conduite d'eau PPR

PPR (polypropylène copolymérisé aléatoire) tuyau is a new type of environmentally friendly plastic pipe, avec sa résistance aux hautes températures, résistance à la corrosion, longue vie (plus que 50 années) and other characteristics, widely used in construction of hot and cold water systems, HVAC engineering and industrial fluid transportation field. Ses principaux avantages comprennent:

Safety and environmental protection: Non-toxic and odorless, conforme aux normes sanitaires de l'eau potable (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.

Installation pratique: 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-tuyau en pouces), 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. Pression nominale (PN value)

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

PN value	Applicable scenes	Maximum working temperature
PN10	Système d'eau froide (≤20°C)	60°C (à court terme)
PN16	Conventional hot and cold water system	70°C (long-term)
PN20	High temperature heating system	80°C (long-term)
PN25	Industrial high pressure systems	95°C (short term)

3. DTS (Rapport dimensionnel standard)

DTS (Rapport dimensionnel standard) 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) / épaisseur de paroi (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

DTS	Pression nominale (PN)	Scénarios applicables
6	PN25	Industrial high pressure, high temperature steam
7.4	PN20	Centralized heating, high temperature water circulation
9	PN16	Conventional hot and cold water systems
11	PN10	Low-pressure cold water transportation

3. How to select according to SDR?

1. Selection according to system pressure demand

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

Conventional residential hot and cold water: DTS9 (PN16) can meet more than 90% of the demand.

Low-cost cold water project: DTS11 (PN10) has the best economy.

2. Matching by temperature adaptability

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

Low temperature chilled water system: High SDR value (par exemple. DTS11) 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.

OIN 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 minutes) after 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) produits. 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.

Fournisseur

Luoyang Datang Energy Tech Co., Ltée. est un fabricant et fournisseur professionnel de tuyaux et de raccords. Nous proposons des tuyaux PPR, Tuyaux en PVC, Tuyaux PE, et tuyaux et raccords de chauffage au sol pour tous types de tuyaux, avec une haute qualité et des prix compétitifs. Si vous avez des questions sur les tuyaux et raccords, n'hésitez pas à nous contacter. Vous pouvez cliquer sur le produit pour nous contacter.