CJ/T 210-2005Random polypropylene/aluminum stable composite pipe (English PDF)

3.1 Definition

3.1.1 Random copolymer polypropylene (PP-R) plastic aluminum steady-state composite pipe

One kind of inner layer is PP-R, the outer layer is covered with aluminum layer and plastic protective layer, the layers are connected by hot melt adhesive to form a five-layer structure pipe (see

Figure 1).

Figure 1 random copolymer polypropylene (PP-R) plastic aluminum steady composite five-story structure diagram

3.1.2 Inner tube

Pressure-bearing layer of PP-R material, which is in direct contact with the medium being conveyed.

3.1.3 Aluminum layer

Using hot melt adhesive bonding method of molding, the aluminum layer through the hot melt adhesive and the inner tube and the outer layer composite adhesive bonding, to UV, Oxygen permeability, reduce the linear expansion coefficient and improve the safety of PP-R aluminum-plastic pipe steady.

3.1.4 Overlay

The plastic layer (PP-R or PE) exposed to the external environment functions primarily to protect the aluminum layer.

3.1.5 Inner layer

The affinity layer between the inner tube and the aluminum layer allows the inner tube to be intimately integrated with the aluminum layer.

3.1.6 Outer layer

The affinity layer, located between the aluminum layer and the overcoat, allows the aluminum layer to be intimately integrated with the overcoat.

3.1.7 Geometry Definition

The specified value of the outer diameter of the inner tube, in mm.

Measured value of cross-section outside diameter of pipe passing through any point in mm.

The value of the measured value of the outer circumference of any cross section of the tube divided by pi (~3.142) is accurate to 0.1 mm and the second non-decimal point Zero-digit carry.

The minimum average outer diameter.

The maximum value of the average outer diameter.

3.1.7.6 Out of roundness

The difference between the maximum outer diameter and the minimum outer diameter of the same cross-section of the pipe in mm.

Pipe wall thickness of the specified value, in units of mm.

Pipe wall thickness at any point measurement, accurate to 0.1mm, after the decimal point second non-zero digital carry.

The minimum thickness of the pipe at any point on the wall.

The maximum value of wall thickness at any point on the pipe circumference.

3.1.7.11 Pipe Series (S)

According to GB/T 10798-2001, to indicate the pipe dimensionless numerical series, according to equation (1) Calculated.

Where.

3.1.8 Terms related to the use of the definition

3.1.8.1 Design pressure (PD)

The maximum design pressure piping system, in units of MPa.

3.1.8.2 Hydrostatic stress (sigma)

With water as the medium, the pipe is subjected to ring stress inside the pipe wall by internal pressure in MPa.

3.1.8.3 Design temperature (TD)

The system is designed to deliver water temperature or temperature combination.

3.1.8.4 The maximum design temperature (Tmax) TD in the short period of time the highest value.

3.1.8.5 Failure temperature (Tmel)

The maximum temperature that appears when the system exceeds the control limit.

3.1.8.6 Cold water temperature (Tcold)

Transport cold water temperature, up to close to 25 °C. Design with 20 °C.

3.1.9 Definition of material properties

3.1.9.1 Lower confidence limit for long-term hydrostatic strength predicted (sigmaLPL)

Confidence limit.

3.1.9.2 Design stress (sigmaD)

The allowable stress for the given conditions of use, in MPa.

3.1.9.3 The total coefficient of use (C) A factor greater than 1, taking into account the performance and conditions of use of the piping system not shown in the LPL.

3.2 Symbol

PD. Design pressure;

sigma. hydrostatic stress;

TD. design temperature Tmax. maximum design temperature;

Tmal. fault temperature;

Tcold. cold water temperature;

sigmaLPL. lower confidence limit for long-term hydrostatic strength predicted;

sigmaD. Design stress.

3.3 Abbreviations

LPL. lower confidence limit;

PP-R. random copolymer polypropylene;

PE. polyethylene;

S. tube series.

4.1 Conditions of use level

PP-R aluminum-plastic steady-state pipe system uses the provisions of GB/T 18991-2003, according to the conditions of use of one of the four application levels, see

Table 1 Each level corresponds to a specific application area and 50 years of service life. Specific application, should also consider 0.4MPa,

0.6MPa, 0.8MPa, 1.0MPa different use of pressure.

Note. This table can not be used when TD, Tmax and Tmal exceed the values given in this table.

The piping systems of each service condition listed in Table 1 meet the requirements of 50-year service life of conveying cold water at 20 °C and 1MPa Request.

4.2 Product Classification

4.2.1 PP-R plastic aluminum steady tube according to the size of the tube is divided into S4, S3.2, S2.5 three tube series.

4.3 Pipe series S value of choice

Pipe according to the level of use conditions and design pressure to select the corresponding S value, shown in Table 2. In other cases, according to Table 3, Table 4, select the corresponding S value.

Table 2 PP-R aluminum steady tube series S value of choice I

Table 3 PP-R aluminum steady tube series S value of choice II

Table 4 PP-R aluminum steady tube series S value of choice III

5.1 Random Copolymerization Polypropylene Resin (PP-R)

Its performance should be consistent with GB/T 18742.1-2002 on the material requirements.

5.2 Polyethylene resin

Its performance should be consistent with GB/T 13663-2000 on the material requirements.

5.3 Aluminum

Using aluminum alloy materials, according to GB/T 228-2002 for testing, the elongation at break should not be less than 12%, the tensile strength should not be less than 110MPa.

5.4 Hot melt adhesive

5.4.1 located in the aluminum layer and PP-R plastic layer of the hot melt adhesive should be propylene copolymer, according to GB/T 1033-1986 in the B test, the secret Degree should be greater than 0.87g/cm3; According to GB/T 3682-2000 method test, the melt flow rate should be less than 7g/10min (190 °C, 2.16 kg); According to GB/T 4608-1984 method test, the melting point of not less than 120 °C.

5.4.2 located in the aluminum layer and PE plastic layer of the hot melt adhesive should be ethylene copolymer, according to GB/T 1033-1986 in the B test, the density should be greater than 0.9g/cm3; according to GB/T 3682-2000 method test, the melt flow rate should be less than 5g/10min (190 °C, 2.16 kg); According to GB/T 4608-1984 method test, the melting point of not less than 120 °C.

5.5 Back to the material

Produced in their own production process in line with the requirements of this standard resin tube back to the expected use of materials, when used by not more than 10% of the proportion added to the unused new material, does not allow the use of other sources of recycled materials.

6.1 Color

The general inner tube and outer coating are gray, other colors should be consistent with relevant state regulations.

6.2 Appearance

Pipe color should be basically the same.

The inner and outer surface of the pipe should be smooth and smooth, no bubbles and other surface defects that affect performance. Tubing should not contain significant impurities. tube the material face should be cut flat and perpendicular to the axis.

6.3 Specifications and structure size

Example. tube series S4, the nominal diameter of 20mm, the nominal wall thickness of 2.3mm.

6.3.2 Structure size

6.3.2.1 PP-R aluminum-plastic steady-state pipe nominal diameter, average diameter, reference diameter, wall thickness, of the inner wall and the minimum thickness of the aluminum layer, see table 5 and Table 6.

Table 5 pipe diameter and reference diameter size in millimeters

Table 6 pipe wall thickness, wall thickness and thickness of the aluminum layer in millimeters

6.3.2.2 Aluminum overlap (overlap) The minimum width is 0.5mm.

6.3.3 Pipe length

6.3.3.1 Straight pipe length is generally 4m, but also according to the user's request by both parties to determine the supply and demand, pipe length is not allowed to have a negative deviation.

6.4 PP-R plastic aluminum steady-state pipe performance requirements

6.4.1 PP-R plastic aluminum steady-state pipe hygiene performance should be consistent with the provisions of GB/T 17219.

6.4.2 The physical properties of PP-R aluminum-plastic steady-state tubes shall comply with the requirements in Table 7.

Table 7 Physical and mechanical properties of pipe

No rupture

No leakage

Hydrostatic state of the heat Stability test no rupture no leakage Change rate <= raw materials

6.4.3 Minimum average peel force of pipe ring

The minimum average peel strength of the pipe ring shall meet the requirements of Table 8 and the minimum peel force of any one of the test specimens shall not be less than the value specified in Table 8 1/2.

Table 8 Tube minimum average peel force

Tube ring minimum average peel force/N 28 30 35 40 50 60 70 75 80

6.5 System Suitability

6.5.1 Pipe fittings with PP-R aluminum-plastic steady-state pipe shall comply with the provisions of GB/T 18742.3-2002.

6.5.2 PP-R aluminum-plastic steady-state pipe and pipe fittings in line with the provisions of GB/T 18742.3-2002 after the connection should be through the internal pressure test and thermal cycling two Combination test.

6.5.2.1 Internal pressure test shall comply with the provisions of Table 9.

Table 9 Internal pressure test

Table 10 Thermal Cycling Test

Note. A cycle time of (30) min, including (15) min maximum test temperature and (15) min minimum test temperature.

7.1 Sample conditioning and testing of the standard environment

Pipe should be sampled after 48h off-line. According to the provisions of GB/T 2918-1998, at a temperature of (23 ± 2) °C, the humidity of (50 ± 10)% Conditions under conditions of regulation, the time of not less than 24h, and under the conditions of the test.

7.2 Appearance and color

Observed with the naked eye.

7.3 Structure size

7.3.1 Length Measurement with a tape measure of 1 mm accuracy.

7.3.2 The minimum width of aluminum lap is measured with vernier caliper.

7.3.3 The average diameter and wall thickness measured according to the method specified in GB/T 8806-1988.

7.3.4 The inner wall thickness and the minimum thickness of the aluminum layer is measured as follows.

b) The use of a magnifying glass or microscope with a scale (precision 0.05mm), take the thickness of the circumference of six equal points, respectively, measuring the inner tube Wall thickness and the minimum thickness of aluminum, whichever is the smallest.

7.4 Tube minimum average peel force

According to the method specified in Appendix A of GB/T 18997.1-2003 test.

7.5 Hydrostatic test

7.5.1 According to the method specified in GB/T 6111-2003 test (a type head).

7.5.2 Test conditions temperature, time and hydrostatic test pressure in accordance with the provisions of Table 7. Test medium is water.

7.6 Longitudinal retraction rate

According to GB/T 6671-2001 Method B test.

7.7 Hygienic performance test

According to GB/T 17219 provisions of the test method.

7.8 System Suitability Test

7.8.1 Internal pressure test

Internal pressure test by the combination of pipe and pipe fittings, which should include at least two more pipe fittings, test methods according to GB/T 6111-2003 Provisions (a type head). Test medium. both inside and outside the tube.

7.8.2 Thermal Cycling Test

According to GB/T 18742.2-2002 Appendix A method for testing. Test medium. water pipe, pipe outside the air.

7.9 Melt mass flow rate

From the pipe cut enough 2mm ~ 5mm size particles as a sample, according to Table 7 and GB/T 3682-2000 provisions of the test.

The melt flow rate meter is calibrated using the standard. Test, first purge the cylinder with nitrogen 5s ~ 10s (nitrogen pressure of 0.05MPa) Then within 20s quickly add the sample to the cylinder test.

7.10 Thermal stability test under hydrostatic conditions

7.10.1 Test Equipment

Circulation temperature control oven.

7.10.2 Test conditions

Table 7 provides that the circulating temperature control oven temperature of 110 +4-2 °C. Test medium. the interior is water and the exterior is air.

7.10.3 Test methods

After the sample is conditioned, it is installed in a circulating temperature-controlled oven and tested according to the provisions of GB/T 6111-2003 (a-type head).

8.1 Group approved

The same raw materials, formulations and processes for the production of the same specifications of products, as a check every 90km. If less than 90km, above Production method seven days production as a check batch. Less than seven days of production, but also as a check batch.

8.2 Stereotypes test

The final inspection items are all the technical requirements stipulated in Chapter 6. The same equipment manufacturer of the same type of equipment for the first time put into operation or raw materials Changes occur, select any specifications of the pipe for shape inspection.

8.3 Factory inspection

8.3.1 Products by the enterprise quality inspection department after passing the inspection and with a qualified mark before leaving the factory.

8.3.2 Factory inspection items are as follows.

a) color and appearance

b) the size of the structure;

c) Longitudinal retraction rate;

d) minimum average peel force of the pipe ring;

e) 20 ° C/1 h and 95 ° C/22 h (or 95 ° C/165 h) tests in the hydrostatic strength test.

8.3.3 color, appearance, size, according to GB/T 2828.1-2003 using normal inspection once sampling plan, take the general test level I, qualified Quality level 6.5, sampling plan in Table 11.

Table 11 Sampling Plan

Batch range

Sample size

Qualified Quality Level 6.5 < 150 8 1 2 151 ~ 280 13 2 3 281 ~ 500 20 3 4 501 ~ 1200 32 5 6 1201 ~ 3200 50 7 8 3201 ~ 10000 80 10 11

8.3.4 In color, appearance and size sampling qualified products, randomly selected enough samples for performance tests (including the longitudinal retraction rate, Tube ring minimum average peel force and 20 °C/1h hydrostatic strength test).

8.3.5 Select the hydrostatic strength test at 95 ° C/22h, once every 24h; when the hydrostatic strength test at 95 ° C/165h is selected, Do it once every 168h

8.4 Type test

8.4.1 The items of the type test are those other than the thermal stability test and the 6.5 system suitability test in the hydrostatic condition in 6.4.2 all technical requirements.

8.4.2 According to the technical requirements of this standard and in accordance with the provisions of 8.3.3 on the color, appearance, size test; randomly selected in the test sample Sufficient samples for other performance tests.

8.4.3 In general, the type test shall be conducted every two years. However, one of the following conditions should be type tested.

a) Formal production, if the structure, materials, processes have greatly changed, may affect product performance;

b) products for any reason to stop production for more than six months to resume production;

c) the factory test results and the last type test results are quite different;

d) When the national quality supervision agency proposes the type inspection requirements.

8.5 Decision rules

Appearance, size according to Table 11 to determine. There is a non-conformity of health indicators as unqualified batch. One of the other indicators failed to meet the requirements , Then double random sample taken for the reinspection, if still unqualified, then sentenced the batch of non-conforming batch.

9.1 Mark

9.1.1 PP-R aluminum-plastic steady-state pipe should have a mark, the mark should be strong, durable and easy to identify, its spacing does not exceed 1m. Mark should be at least package Including the following.

a) trademark

b) the name of the manufacturer;

c) product name;

e) This standard number;

f) Production date.

9.1.2 The package shall have at least the following markings.

a) trademark

b) product name;

c) business name and address;

d) product specifications;

e) the number of products;

f) Production date and lot number.

9.2 Packaging

Products should be packed into the same size bag packaging, sealing, but also according to the user's request through consultation.

9.3 Transportation

Tubing shall not be thrown, exposed, stained, stressed, or damaged during handling and transportation.

9.4 Storage

Pipe should be properly stacked in the indoor warehouse, away from heat, stacking height of not more than 1.5m.