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MULTILAYER GAS PIPING SYSTEM

The RIFENG multilayer gas piping system is a pipe generation that unites the advantages of a plastic and metal pipe and offers a high degree of flexibility and toughness, coupled with high pressure and temperature resistance. Overlapped and butt welded are both avalible for the aluminum alloy layer that guarantees an entire barrier to the passage of oxygen and light and provides excellent mechanical and chemical properties.
 

Technical specification

Advantage:
• Entirely corrosion-resistant
• A barrier to the permeation of oxygen and light
• High bend flexibility and inherent stability
• Excellent hydrostatic stress performance
• Light in weight
• Smooth inner wall ensures less pressure loss
• Service life up to 50 years
• Overlapped and butt welding are both avaliable


Applications:
RIFENG Multlayer plumbing system can be used in following applications:
LPG vapour, natural gas and natural gas liquids.

 
Standards:
ISO 17484 - Plastics piping systems - Multilayer pipe systems for indoor gas installations with a maximum operating pressure up to and including 5 bar (500 kPa) - Specifications for systems
UNE53008.1-2014 - Plastics piping systems - Multilayer pipe systems for indoor gas installations with a maximum operating pressure up to and including 5 bar (500 kPa) - Specifications for systems


Certificates:
AENOR - refers to ISO 17484
StandardsMark - refers to UNE53008.1-2014


 
 
TYPE Multilayer Gas Pipe
  B1 (PEX-AL-PEX) DB1 butt weld (PEX-AL-PEX) C (PE-AL-PE) DC butt weld (PE-AL-PE)
Roughness(mm) 0.0007 0.0007
Melting point (℃) 127
Density (g/cm3) 0.926-0.959 0.941-0.959
Modulus of elasticity 7200 7200
(MPa)
Thermal conductivity  0.45 0.45
(w/mK)
Coefficient of thermal expansion (mm/mK) 0.025 0.025

Material Test item Requirement
Polyethylene Density HDPE:0.941~0.959 g/cm3 MDPE:0.926~0.941 g/cm3
(PEX) Melt flow index HDPE、MDPE≥0.1 g/10min(190,2.16kg)
Tensile strength HDPE≥21MPa;MDPE≥14MPa
Enlongation ≥400%
Vicat soft point Vicat soft point≥105℃
Cross-linking degree ≥65%
ESCR ≥165h
Color masterbatch Moisture content ≤0.15%
Appearance Uniform granual
Volatile content ≤0.5%
catalyst Density ≥0.93 g/cm3
Melt flow index ≥0.9 g/10min(190℃,5.00kg)
Volatile content ≤0.35%
Adhesive resin Appearance Uniform granual
Density ≥0.926 g/cm3;
Melt flow index 2.0~6.0 g/10min(190℃,2.16kg)
Vicat soft point Vicat soft point≥105℃
T peeling strength ≥70N/25mm
Aluminum Surface quality Water brush test≥class
Tensile strength 105MPa~125MPa
Appearance Without oil on surface
Hardness(HV) 28~33
T peeling strength Minimum value≥60N/25mm
 
Nominal size(D x e) 14×2.0 16×2.0 18×2.0 20×2.0 25×2.5 32×3.0 40x4.0 50x4.5 63x6.0 75x7.5
Outside diameter (mm) 14 16 18 20 25 32 40 50 63 75
Tolerance of Outer diameter  (mm) Min 14.00 16.00 18.00 20.00 25.00 32.00 40.00 50.00 60.60 70.70
Max 14.20 16.20 18.20 20.20 25.20 32.20 40.40 50.50 63.00 75.00
Inside diameter(mm) 10 12 14 16 20 26 32 41 51 60
Tolerance of Inner diameter (mm) Min 9.90 11.90 13.90 15.90 19.90 25.90 30.90 39.40 49.30 57.70
Max 10.20 12.20 14.20 16.20 20.20 26.20 31.90 40.80 50.80 59.70
Pipe thickness (mm) 2 2 2 2 2.5 3 4 4.5 6 7.5
Tolerance of pipe thickness (mm) Min 2.00 2.00 2.00 2.00 2.40 2.90 4.00 4.50 6.00 7.50
Max 2.25 2.25 2.25 2.25 2.70 3.20 4.60 5.20 6.80 8.50
Compression connections
This fittings allows for the connection of multilayer pipe. On the coupling ends, the union with the polyethylene inner tube is sealed by O-rings placed on the removable insert that is introduced into the fitting body and into the tube. The connection is tightened by the nut with wrench.

Press connections
Use special tools, phisically press a connection onto the pipe to make an impermeable connection or seal. RIFENG provide 4 different press fittings.
F5 used with U profile crimper
F9 (leakage indicate) used with TH profile crimper

 
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