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△ L = △ T × L × α △ L: Telescopic Length (mm) △ T: Calculation of temperature (℃) L: pipe length (M) α: coefficient of linear expansion (mm / m. ℃) the general desirability of 0.07. For example, in the Xinjiang desert, the highest temperature of 45 ℃, the night temperature is 30 ℃, the tube length 6M, △ L = (45-30) × 6 × 0.07 = 6.3 mm clear, a 6-meter-long pipe shrinkage 6.3 mm, at first sight RR connection on the pipeline negligible, in fact, a short tube 6.3 mm, 30 根 pipe on the short 189 mm, in practice, it can spread numerous 6.3 mm uniform interfaces in each contraction, it may focus on a few or scores of 6.3 mm, in a sudden disconnect interfaces, resulting in a good pipeline there has been little to connect a tube phenomenon, this can not be ignored. In the Xinjiang desert, because the time difference, installation timing and 16:00 in the morning after, and promptly backfill to solve the pipeline shrinkage. |
