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Method for inspecting reinforced thermoplastic pipe based on designed life

A technology that enhances thermoplasticity and design life. It is applied in the direction of strength characteristics, using stable tension/pressure to test material strength, and analyzing materials. The effects of production cost, shortened production cycle, increased reliability and product competitiveness

Active Publication Date: 2013-01-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing inspection method aimed at the long-term life of RTP can only increase the cost of the product, but has no beneficial effect on quality control.

Method used

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  • Method for inspecting reinforced thermoplastic pipe based on designed life
  • Method for inspecting reinforced thermoplastic pipe based on designed life
  • Method for inspecting reinforced thermoplastic pipe based on designed life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Taking steel wire-wound reinforced plastic composite pipe (PSP for short) as an example, the burst pressure at which the PSP design life is 50 years is predicted by the method mentioned in this patent. PSP specifications are shown in Table 3:

[0095] Table 3 PSP Specifications

[0096] Nominal diameter / mm

Steel wire diameter / mm

Total number of steel wires

Wall thickness / mm

Winding angle θ / °

110

0.8

36

8.5

35.3

[0097] 1. PSP rapid blasting test

[0098] Test temperature T a The temperature is 20°C, and the inner medium of the sample is water. The results of the rapid burst test are shown in Table 4.

[0099] Table 4 The relationship between rapid burst pressure and burst time

[0100]

test 1

test 2

Test 3

Burst pressure / MPa

6.4

6.6

6.2

Blasting time / s

135

122

129

[0101] According to the experimental results, the average value ...

Embodiment 2

[0141] Taking aramid fiber reinforced composite pipe (AFRP for short) as an example, use the method mentioned in this patent to predict the burst pressure of AFRP with a design life of 50 years. AFRP specifications are shown in Table 9:

[0142] Table 9 AFRP Specifications

[0143]

[0144] 1. AFRP rapid burst test

[0145] Test temperature T a The temperature is 20°C, and the inner medium of the sample is water. The results of the AFRP rapid burst test are shown in Table 10.

[0146] Table 10 The relationship between rapid burst pressure and burst time

[0147]

test 1

test 2

Test 3

Burst pressure / MPa

12.1

11.7

12.2

Blasting time / s

61

63

55

[0148] According to the experimental results, the average value of the burst pressure is:

[0149] P b = 1 n Σ i = ...

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Abstract

The invention relates to the field of design and inspection of reinforced thermoplastic pipes (RTP) and aims at providing a method for inspecting the reinforced thermoplastic pipe based on the designed life. The method comprises the following steps of: performing bursting test on the RTP; performing puncture test on the RTP; performing tensile test on a reinforcement material of the RTP and a base body material of the RTP; obtaining a long-time burning pressure Plife of the RTP based on the designed life; and finally comparing a relation between the long-time burning pressure Plife and a designed pressure Pdesign, if Plife is greater than or equal to K'Pdesign, determining that the product is qualified. By the method, the burning pressure under long-time service life of the RTP can be forecast and inspected by short-time test, so the working procedure of performing a large amount of long-time hydrostatic test in the conventional long-time hydrostatic intensity measurement method basedon an extrapolation method, so the RTP production cost is saved, the production period is shortened, and the reliability and the product competitiveness of the RTP are enhanced.

Description

technical field [0001] The invention relates to the field of design and inspection of reinforced thermoplastic composite pipes, in particular to a method for inspecting reinforced thermoplastic composite pipes based on design life. Background technique [0002] Reinforced Thermoplastic Pipe (RTP) is a new type of pipe that has been developed in recent years and has significant advantages over traditional metal pipes or plastic pipes. It combines the high strength of the reinforcing material with the flexibility and corrosion resistance of the matrix material, so it can not only withstand high working pressure, but also maintain the toughness similar to polyethylene pipes. RTP usually has a three-layer structure: the inner layer is a thermoplastic material such as high-density polyethylene (HDPE); the middle layer is a reinforced layer made of steel wire or other high-strength fibers; the outer layer is a protective layer made of thermoplastics such as HDPE. Due to the uniqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00G01N3/12G01N3/08
Inventor 郑津洋施建峰饶静郭伟灿
Owner ZHEJIANG UNIV
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