Product advantages
1. Not easy to leak, long service life: double layer pipe wall is hard, using natural rubber seal ring flexible connection, reliable connection, not easy to leak, good low temperature impact resistance, service life up to 50 years.
2. Good flexibility, not easy to deform: the double-layer pipe wall is adopted for the bell mouth, which is expanded online and formed in one time during production, which avoids the deformation characteristics of single-layer pipe wall due to its thin wall.
3. Light weight, convenient installation: the product is light in weight, convenient in handling and connection, fast in construction and simple in maintenance.

Product specifications: 

Size DN/ID	Pipe Inner Diameter d≥	Pipe OD de≥	Depth of the socket Ls≥	Socket diameter D≥
200	195	226	150	242
225	221	260	150	260
300	296	338	153	342
400	392	458	230	463
500	491	578	260	563
600	595	695	220	665
800	785	910	220	890

Comprehensive comparison between PE double - walled tube and other tubes
Items	PE double wall bellows	PVC-U	Coagulation and tube
corrosion resistance	在海水及酸、堿士壤中不會被腐蝕，抗酸堿腐蝕能力強	較好	不耐酸喊腐蝕，嚴重者將產生泄露告成地下水污染
impact resistance	耐中擊性好	在硬物沖擊下有破裂、短裂危險，耐中擊性差	較好
Flexibility	Good flexibility, seismic section uneven settlement when not broken, suitable for any soil	Better	not good
application property	Saving mechanical cost, convenient connection, guaranteed construction quality in winter (minimum construction temperature up to minus 30°C), good construction, especially suitable for northern China	Rubber sealing ring or adhesive connection is adopted, which is convenient for construction but difficult to ensure the construction quality in winter (minimum construction temperature 5°C)	Heavy material, inconvenient transportation construction, poor manual connection
Economy	The comprehensive cost is low	The comprehensive cost is low	Low cost of materials but high cost of operation and maintenance
sanitary property	Non-toxic and pollution-free, sanitary property as the best	When the waste pipe is burned, it will release heavy metal smoke and pollute the environment	There will be leakage phenomenon, pollution of the environment
Service life	More than 50 years	50 years	10-20 years

Performance index of polyethylene (PE) double wall bellows
Items		performance evaluation
Appearance		Obvious impurities and irregular ripples in the inner and outer walls of the pipe are not allowed. Both ends of the pipe should be flat and perpendicular to the axis and located in the trough area of the pipe. The inner and outer walls of the trough area of the pipe should be fused tightly, and it is not easy to break away
ring-stiffness，KN/m	SN4	≥4
	SN8	≥8
Flexible ring		The specimen is smooth, no reverse bending, no rupture, no separation of the two walls
Oven test		No bubbles, no delamination, no cracking
Impact Testing，（TIR )/%		≤10
Creep Rate		<4