YD/T 841-1996Underground communication pipe with plastic pipe (English PDF)

3.1 Product classification

Communication plastic cable pipe can be classified into the following ones as per the

materials.

--- High density polyethylene (HDPE) pipe taking high density polyethylene as the

main material;

--- Rigid PVC (PVC-U) pipe taking rigid PVC a the main material.

It can be classified into the following pipes as per the structure.

--- Double-wall corrugated pipe with smooth internal wall and corrugated

external wall ("double-wall corrugated pipe" for short);

--- Composite foam pipe with smooth internal and external wall, and intermediate

containing foam layer ("composite foam pipe" for short);

--- Solid wall plastic pipe with smooth internal and external wall ("solid wall pipe" for

short);

--- Single-wall corrugated pipe with uneven internal and external wall.

It can be classified into the following pipes as per the molding appearance.

--- Hard straight pipe;

--- Hard bent pipe;

--- Rotatable pipe.

3.2 Product model and label

Product model and label consists of prefix, material, structure, molding appearance,

outside/inside diameter and plant name.

4.5 Refer to Table 1 for the pipe structure and size; the diameter of pipe used in the

same city shall be consistent as much as possible; refer to Appendix A for the

application range of various pipe diameters.

Table 1 mm

Nominal

Diameter

Allowable Deviation of Outside

Diameter Minimum Inside Diameter

di min

Pipe Length Application Range Composite foam,

solid wall pipe

Double-wall

corrugated pipe

+0.4

+0.3

+0.3

+0.3

+0.3

+0.4

-0.7

+0.3

- 0.6

+0.3

-0.5

+0.3

-0.4

+0.3

-0.3

±30

Beyond the penetrate and put

standard series

Little use of extra-large cable

Feeder pipe

From feeder pipe to the connection

cabinet, special network

Wiring pipe

Fiber optic cable

Note.

1.Allowable deviation between composite foam pipe and solid wall pipe shall be positive value, which is expressed by

, thereof, x shall be equal or more than the larger value of the following two ones.

a) 0.3mm;

b) 0.003de, the value less than 0.1mm shall be calculated as 0.1mm.

2.The maximum outside diameter and minimum inside diameter among composite foam pipe, solid wall pipe and

double-wall corrugated pipe equal.

3.The ratio between maximum outside diameter and minimum inside diameter of double-wall corrugated pipe shall be

1.009.1.

The color and luster of pipe shall be uniform; it shall be black or gray, which is

determined by the buyer and seller, however, it must be different from other similar

underground plastic pipes. The color of sub-pipes penetrating into the same large

diameter of plastic pipe shall be different.

5.2 Appearance

a) Pipe wall is not allowed to have air bubbles, cracks, discoloration

decomposition line, and obvious impurities. The waveform of corrugated pipe shall

be even, having no shortened wave.

b) The internal walls of composite foam pipe and solid wall pipe are required to be

smooth; and the medial incision is also required to be smooth.

c) The internal walls of double-wall corrugated pipe are required to be smooth; slight

fluctuation of the internal wall is allowed during the wave forming.

d) The internal and external walls of the double-wall corrugated pipe shall be closely

frit; and no opening phenomenon shall occur.

5.3 Size and deviation

5.3.1 Pipe length deviation shall conform to the provisions in Table 1.

5.3.2 Pipe average outsider diameter, minimum inside diameter, and its deviation

shall conform to the provisions of Table 1.

5.3.3 The same cross-sectional thickness deviation between composite foam pipe

and solid wall pipe shall be no more than 14%.

5.3.4 Pipe minimum socket's average inside diameter and depth shall conform to

the provisions in Table 2.

5.3.5 Pipe bent in the same direction shall be less than 2%.

5.4 Physical and mechanical properties

5.4.1 Pipe's physical and mechanical properties shall conform to the requirements in

Table 5.

Table 5

Items Technical Indicators Test Methods

Drop hammer impact (0°C) 9/10 no breaking See Clause 6.5.1

Ring stiffness (kN/m2) >=6.3 See Clause 6.5.2

Flattering test No breaking See Clause 6.5.3

Coefficient of friction Dry putting <=0.363 Applying swell soil <=0.155

Connection sealing test No leakage See Clause 6.5.4

Note. coefficient of friction refers to the one when the internal wall of pipe penetrates the low density

sheath cables. Test methods is to be determined.

5.4.2 Cold-bending radius of curvatu...

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