GB/T 35451.1-2017Polypropylene structure-wall piping systems for underground drainage and sewerage - Part 1: Polypropylene double wall corrugated pipes (English PDF)

1.5 GB/T 3682

3 Thermal stability (oxidation induction time,.200 ° C, aluminum dish)/min >= 20 >= 20 GB/T 19466.6

2.5 MPa, 1000

h) a No damage, no leakage, no damage, no leakage GB/T 6111, Type A sealing joint

3.1 Terms and definitions The following terms and definitions as defined in

GB/T 19278-2003 apply to this document.

3.1.1 Nominal inner diameter DN/ID The nominal size associated with the inner diameter.

3.1.2 Average outer diameter meanoutsidediameter Dem The value obtained by dividing the outer circumference of the maximum cross section of the tube (excluding the socket) by the pi (3.142) is rounded up to

0.1 mm.

3.1.3 Mean inner diameter meininsidediameter Dim Two or more (two or more sets) of mutually perpendicular inner diameter arithmetic mean values are measured in the same section of the tubing (excluding the socket).

3.1.4 Mean inner diameter meininsidediameterofasocket Dim The arithmetic mean of two or more mutually perpendicular inner diameters is measured in the same section of the socket.

3.1.5 Laminated wall thickness walthicknessoftheinsidelayer(waterwaywalthickness) The thickness of the pipe wall between the corrugations of the pipe (see Figure 1).

3.1.6 Inner wall thickness walthicknessoftheinsidelayerunderaholowsection E

1 The thickness of any part of the inner wall of the pipe (see Figure 1).

3.1.7 Minimum joint length of the socket minimumlengthofengagementofthesocket Amin The minimum allowable value of the length of the joint between the seal and the cylindrical end of the inner wall of the socket (see Figure 2).

3.1.8 Nominal ring stiffness SN The nominal value of the stiffness of the tubing ring obtained by rounding is usually a round integer that is easy to use. [

GB/T 19278-2003, definition 6.6]

3.2 symbol The following symbols apply to this document. A. joint length Di. the inner diameter of the socket Dim. average inner diameter of the socket DN/ID. nominal size in inner diameter De. outer diameter Di. inner diameter Dim. average inner diameter e. laminated wall thickness E1. inner wall thickness L. effective length of pipe SN. nominal ring stiffness

3.3 Abbreviations The following abbreviations apply to this document. MFR. melt mass flow rate (meltmass-flowrate) OIT. oxidation induction time (oxidationinduction time) PP. Polypropylene PP-B. impact copolymerized polypropylene (polypropyleneblockcopolymer) TIR. true impact rate (trueimpactrate)

4.1 Raw materials

4.1.1 Raw materials should be based on impact-resistant copolymerized polypropylene (PP-B) base resin, which can be added with antioxidants, pigments and UV-resistant to improve pipe properties. Additives such as wire (UV) stabilizers, polypropylene (PP) resin content (mass fraction) should be above 95%.

4.1.2 The properties of polypropylene (PP) base resin and raw materials shall comply with the requirements of Table 1. Table

1 Properties of polypropylene base resin and raw materials Serial number item Claim Basic resin raw material experiment method Internal pressure resistance (80 ° C, ring stress

4.2 MPa, 140

h) a Internal pressure resistance (95 ° C, ring stress

7.3 Geometric dimensions

7.3.1 General The pipe size is expressed by the nominal inner diameter (DN/ID inner diameter series).

7.3.2 Length The effective length L of the pipe is generally 6m, and the other lengths are determined by negotiation between the supplier and the buyer. The length is not allowed to have a negative deviation.

7.3.3 Size The dimensions of the pipe shall comply with the requirements of Table 3, and the minimum average inner diameter of the socket shall not be less than the maximum average outer diameter of the pipe, and the wall thickness of the socket shall not Less than 75% of the wall thickness of the laminate. Other dimensions are agreed between the supplier and the purchaser or given by the manufacturer. Table

3 The dimensions of the pipe are in millimeters Nominal inner diameter DN/ID Minimum average inner diameter Dim,min Minimum laminated wall thickness Emin Minimum joint length of the socket Amin Minimum inner wall thickness E1,min 100 95 1.0 32 1.0 125 120 1.2 38 1.0 150 145 1.3 43 1.0 200 195 1.5 54 1.1 225 220 1.7 55 1.2 250 245 1.8 59 1.4 300 294 2.0 64 1.4 400 392 2.5 74 2.0 500 490 3.0 85 2.2 600 588 3.5 96 2.5 800 785 4.5 118 3.0 1000 985 5.0 140 4.0 1200 1185 5.0 162

4.0 The tolerance of the outer diameter of the pipe shall meet the following requirements.

---dem, min>=0.994×de;

---dem, max<=1.003×de. Where de is the outer diameter specified by the pipe manufacturer, and the calculation result retains one decimal place.

7.4 Physical and mechanical properties of pipes The physical and mechanical properties of the pipe shall comply with the requirements of Table 4. Table

4 Physical and mechanical properties of pipes Project requirements test method Density/(kg/m3) 895 ~ 920 See

8.3 Dimensional measurement

8.3.1 Effective length According to the position shown in Figure 1, according to the provisions of GB/T 8806, the effective length of the pipe is measured with a gauge with an accuracy of not less than 1 mm.

8.3.2 Average inner diameter According to the provisions of GB/T 8806, two or more pipes of the same cross section perpendicular to each other are measured with gauges with an accuracy of not less than 1 mm. The inner diameter value, with its arithmetic mean as the average inner diameter of the tube.

8.3.3 Wall thickness According to the provisions of GB/T 8806, the wall thickness of the laminate and the inner wall thickness are measured with a gauge having an accuracy of not less than

0.02 mm.

8.3.4 Joint length As shown in Fig. 2, the joint length was measured with a gauge having an accuracy of not less than

0.02 mm.

8.4 Density The test was carried out according to Method A of GB/T 1033.1-2008.

8.5 Ash The test was carried out in accordance with the method of Method A of GB/T 9345.1-2008, and the calcination temperature was 850 °C.

8.6 Oxidation induction time According to the provisions of GB/T 19466.6, the inner wall of the pipe should be sampled.

8.7 Ring stiffness Test according to the provisions of GB/T 9647. When the average length of the sample is less than 290mm, a ripple should be added (the average length can be exceeded) Over 310mm). The cutting point should be in the middle of the trough when sampling.

8.8 Impact performance

8.8.1 Sample When the nominal diameter of the pipe is <=500mm, it shall be sampled according to GB/T 14152-2001; when the pipe nominal diameter is >500mm, it can be diced. experimenting. The size of the sample block is. length (200±10) mm, inner chord length (300±10) mm, and the outer diameter of the sample block should be circular. On the upper side, the two ends are placed horizontally on the bottom plate, and the impact point should be ensured as the top end of the corrugation.

8.8.2 Test procedure The test was carried out in accordance with the provisions of GB/T 14152-2001. The hammer type of the drop hammer was d90. Test temperature is (0 ± 1) ° C, with V-type support Plate, drop weight and impact height are shown in Table 6. Table

6 Drop weight and impact height Nominal inner diameter Mm Drop hammer quality Kg Impact height Mm DN/ID<=110 0.5 1600 110 \u003cDN/ID<=125 0.8.2000 125 \u003cDN/ID<=160 1.0.2000 160 \u003cDN/ID<=200 1.6.2000 200 \u003cDN/ID<=250 2.0.2000 250 \u003cDN/ID<=300 2.5.2000 DN/ID >300 3.2.2000

8.8.3 Determination Visually, the sample was cracked, cracked, or cracked in the inner wall after impact. According to the number of sample damage, GB/T Figure 2 or Table 5 of 14152-2001 determines the TIR value.

8.9 Ring flexibility

8.9.1 Sample Take 3 sections of the sample of length (300±20)mm from the same pipe, and both ends should be perpendicular to the axis, if the cutting position is not at the trough. Extended to the trough.

8.9.2 Test procedure Tests shall be carried out in accordance with the provisions of GB/T 9647, and the test force shall be continuously increased. When the sample is deformed in the vertical direction, the outer diameter is the original outer diameter. Immediately unload at 30%, observe whether the inner wall of the sample remains smooth, whether the inner and outer walls are broken, and whether the two walls are disengaged.

8.10 Oven test

8.10.1 Sample Take 3 sections of pipe (300±20) mm long, and cut the pipe with the nominal inner diameter <=400mm into two samples of the same size along the axial direction; When the pipe nominal diameter is >400mm, four samples of the same size are cut along the axial direction.

8.10.2 Test procedure Set the oven temperature to (150 ± 2) ° C. After the temperature is reached, place the samples in the oven so that they do not touch each other and do not contact the oven wall. Contact. When the laminated wall thickness e <= 8mm, it is placed at (150 ± 2) °C for 30min; when the laminated wall thickness e > 8mm, at the same temperature After standing for 60 min, it was observed after cooling to room temperature, and the sample was unqualified if delamination, cracking or foaming occurred.

8.11 Creep ratio Test according to the provisions of GB/T 18042. The test temperature was (23 ± 2) ° C, calculated and extrapolated to a creep ratio of two years.

8.12 System Suitability According to the provisions of Appendix A.

9.2 Factory inspection

9.2.1 The factory inspection items are ring stiffness, ring flexibility and oven test in 7.1, 7.2,

7.3 and Table 4.

7.2 and 7.3, except for the laminated wall thickness and the inner wall thickness, the test shall be carried out according to GB/T 2828.1, and the normal test shall be used for sampling. For the sample plan, take the general inspection level I, the acceptance quality limit (AQL) 4.0, and the values of N, n, Ac, and Re are shown in Table 7. Table

7 The sampling plan unit is root batch Sample size Qualified judgment number Ac Number of unqualified judgments Re 2~15 2 0 1 16~25 3 0 1 26~90 5 0 1 91~150 8 1 2 151~280 13 1 2 281~500 20 2 3 501~1200 32 3 4 1201~3200 50 5 6 3201~10000 80 7 8

9.2.3 In the samples that pass the

9.2.2 sampling inspection, randomly sample the samples, perform the ring stiffness, ring flexibility and oven test in 7.4; Three samples were taken from the machine, and the wall thickness and inner wall thickness of

7.3.3 were measured and the minimum value was taken.

9.3 Type test The type inspection items are all technical requirements items specified in Chapter 7. In general, type inspection is carried out every 3 years. One of the following situations should be type tested.

a) Trial-type identification of new or old products to the factory;

b) When there are large changes in structure, materials and processes that may affect product performance;

c) when the product is suspended for more than half a year and resumes production;

d) When the factory inspection result is significantly different from the previous type inspection.

9.4 Decision rules If any of 7.1, 7.2, and

7.3 does not meet the requirements of Table 7, the batch is judged to be unqualified. When one of the other projects fails to meet the target, press

9.2.3 The double-sample is randomly selected from the qualified samples to be re-examined. If it is still unqualified, the batch is judged as unqualified. 10 signs, transportation, storage

10.1 mark The product should have the following logo.

a) the markings specified in 5.2;

b) the name of the manufacturer;

d) Date of manufacture.

10.2 Transportation The product should be covered during loading and unloading, and should not be subjected to severe impact, throwing and heavy pressure.

10.3 Storage The storage area of the pipe should be flat, the stack should be neat, the stacking height should not exceed 4m, away from the heat source, should not be stored and exposed in the open air.