Evaluation of testing procedures for real-scale sewage pipes
| العنوان: | Evaluation of testing procedures for real-scale sewage pipes |
|---|---|
| المؤلفون: | Marc Wichern, B. Bosseler, S. Ulutaş |
| المصدر: | Water Science and Technology, Vol 84, Iss 4, Pp 810-819 (2021) |
| بيانات النشر: | IWA Publishing, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Environmental Engineering, Scale (ratio), business.industry, education, 0211 other engineering and technologies, Sewage, 020101 civil engineering, 02 engineering and technology, Environmental technology. Sanitary engineering, Civil engineering, 0201 civil engineering, leak test, quality, sewerage, 021105 building & construction, Environmental science, inspection, business, wastewater, pipelines, TD1-1066, Water Science and Technology |
| الوصف: | Tests to determine the tightness of wastewater pipes can in some cases produce results that are worthy of discussion. Therefore, testing procedures for real-scale sewage pipes used for house connections were evaluated and data were statistically analysed. The results of the investigation showed that leaky pipes are detected with a very high degree of reliability by all leak test methods. The test methods are also robust against errors by expert testers and deviations from the test specifications. In contrast, tight pipelines can also be incorrectly classified as ‘leaking’ (test failed) to a significant extent during leak tests. Even for the more reliable test methods, i.e. air overpressure, air underpressure and water with low test pressure, a tight pipe is incorrectly classified as leaking (false positive) in one out of 10 cases (10%). The highest false-positive rate was 20% for water with high test pressure. In addition to the leak test methods, the quality of the visual inspection was also analysed. Here it was found that visual inspection is not sufficiently reliable for determining the tightness of pipelines above the groundwater level. Error rates of approximately 50% were found for the detection of tight and leaky pipelines. HIGHLIGHTS Investigation of the quality of leak tests and visual inspection for sewage pipes on a real scale.; Determination of error rates for the different test methods (visual inspection, air overpressure, air underpressure and water pressure).; Evaluation of the different test methods for the determination of tightness.; Development of recommendations for action to increase the reliability of the test results. |
| تدمد: | 1996-9732 0273-1223 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3986f36a72cc0d4bf2c8f59607fdfbf4 https://doi.org/10.2166/wst.2021.270 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....3986f36a72cc0d4bf2c8f59607fdfbf4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19969732 02731223 |
|---|