Multilayer Gas Piping System

The RIFENG Multilayer Gas Piping System is a new generation of pipe that combines the benefits of a plastic and metal pipe, providing high flexibility and toughness as well as high pressure and temperature resistance. Overlapped and butt-welded are both available for the aluminum alloy layer and guarantee a complete barrier against oxygen and light and provide excellent mechanical and chemical properties.

Product Inquiries

Technical Specifications

• Entirely corrosion-resistant.

• A barrier to oxygen and light permeation
• Inherent stability and high bend flexibility
• Excellent hydrostatic stress performance
• Light in weight
• Less pressure loss is ensured by a smooth inner wall.
• Up to 25 years of service life
• Both overlapping and butt welding are options.

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

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

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

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
Tolerance of Outer diameter (mm)	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
Tolerance of Inner diameter (mm)	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
Tolerance of pipe thickness (mm)	Max	2.25	2.25	2.25	2.25	2.70	3.20	4.60	5.20	6.80	8.50

Compression connections
This fitting allows for the connection of multilayer pipes. 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 the 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

Product Overview

HDPE AL HDPE (C Series)

PEX AL PEX (B1 Series)

HDPE AL HDPE (Butt) (DC Series)

PEX AL PEX (Butt) (DB1 Series)
Straight coupling

Reducing coupling

Male straight coupling

Female straight coupling

Demountable Female straight coupling

Elbow

Reducing elbow

Male Elbow

Female Elbow

Wall plated Female Elbow

Tee

Reducing Tee

Female Tee

Male Tee

End cap
Straight coupling

Reducing coupling

Male straight coupling

Female straight coupling

Demountable Female straight coupling

Elbow

Male Elbow

Wall plated Female Elbow

Tee

Reducing tee

Male Tee

Female Tee
Straight coupling

Reducing coupling

Male straight coupling

Female straight coupling

Elbow

Male Elbow

Female Elbow

Tee

Reducing tee

Female tee
Pipe cutter

Pipe cutting tool

Plastic reamer

Electric reamer

Manual pressing clamp and jaw

Integral manual pressing clamp

Pipe bending tool

Internal bending spring

External bending spring

Plastic socket