Design of chlorine oxidation resistance test system for high density polyethylene pipes

doi:10.19491/j.issn.1001-9278.2021.12.012

Abstract

Abstract:

To investigate the chlorine oxidation resistance of high density polyethylene （PE?HD） pipes， a closed cycle test system was designed on the basis of the ASTM F2263 standard. The test system accelerated the oxidation failure of samples through changing the temperature， pressure， and available chlorine content under the flowing condition. The results indicated that the system could measure the 24 DN 20 PE?HD tubular samples independently， and the programmable logic controller could be used as a control host to control the pressure， temperature， and flow of the pipelines. Furthermore， the visual human?computer interface could be realized through coupling with various sensors， and the built?in alarm system could ensure the safety and reliability of the test. Therefore， the test system can be used to evaluate the chlorine oxidation resistance of the PE?HD pipes.

Key words: high density polyethylene pipe, oxidation failure, test system

CLC Number:

TQ320.66⁺2

SUN Linjie, ZHANG Jingwei, CHEN Shushan, LAI Huansheng, WEI Zuoyou. Design of chlorine oxidation resistance test system for high density polyethylene pipes[J]. China Plastics, 2021, 35(12): 70-75.

Figures/Tables 11

Fig.1. Design flow chart

试验参数	单位	最小值	最大值	允许误差
有效氯含量	mg/L	0	50	1
水温	℃	50	90	1
空气温度	℃	50	90	1
氧化还原电位	mV	825	-	10
流量	L/min	0.23	1.10	0.02
pH	-	6.5	8.0	0.1
管道压力	MPa	0.61	0.83	0.02

Tab.1. Test conditions of samples

Fig.2. System structure diagram

Fig.3. Sample assembly drawing

Fig.4. Test process flow chart

分组编号	管道压力1/ MPa	管道压力2/MPa
1	0.61	0.75
2	0.63	0.77
3	0.65	0.79
4	0.66	0.8
5	0.68	0.82
6	0.69	0.83

Tab.2. Pipes′ pressure of sample

Fig.5. Schematic diagram of the principle of branch pressure and flow adjustment

Fig.6. Schematic diagram of system control system structure

Fig.7. Test interface of the system

Fig.8. Display of the system

Fig.9. System control flow chart

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