仅针对80号PVC 90度弯头、异径管、膨胀管和三通确定了压力损失系数。对尺寸为2、4、6和8英寸（5.08、10.16、15.25和20.32厘米）的注塑PVC弯头和三通进行了测试。额外的预制PVC弯头测试尺寸为8英寸（20.32厘米），额外的预制PVC三通测试尺寸为6英寸和8英寸（15.25厘米和20.32厘米）。注塑PVC异径管和膨胀管的尺寸分别为6×4英寸（15.25×10.16厘米）和8×6英寸（20.32×15.25厘米）。PVC异径管和膨胀管均为注塑配件，以及由PVC套管异径管和膨胀管制成的配件。共测试了来自七家不同供应商或制造商的219个单独配件，以确定压力损失系数。 为该项目进行的单独测试运行总数为2300次，在21个不同的测试设置中进行。本研究还评估了供应商不同设计之间损耗系数的分散或变化。在指定的管道速度范围内检查每个试验配件，以确定损失系数的平均值和变化。此外，还进行了额外的测试，以评估PVC弯头和三通承插连接中的间距间隙和胶珠对压力损失的影响。所有试验均使用80号PVC管和PVC管件进行。

Pressure loss coefficients were determined for only Schedule 80 PVC 90 degree elbows, reducers, expansions, and tees. Injection molded PVC elbows and tees were tested in the sizes of 2, 4, 6, and 8-inches (5.08, 10.16, 15.25, and 20.32 cm). Additional fabricated PVC elbows were tested in the 8-inch size (20.32 cm) and additional fabricated PVC tees were tested in the sizes of 6, and 8-inches (15.25, and 20.32 cm). Injection molded PVC reducers and expansions were tested in the sizes of 6 by 4-inches (15.25 by 10.16 cm) and 8 by 6-inches (20.32 by 15.25 cm). The PVC reducers and expansions were both injection molded fittings and fittings fabricated from PVC bushing reducers and expansions. A total of 219 individual fittings from seven different vendors or manufacturers were tested to determine pressure loss coefficients. The total number of individual test runs conducted for this project was 2,300 and were made in 21 different test setups. The scatter or variation in loss coefficients between the different designs of the vendors was also evaluated in this study. Each test fitting was examined at a specified range of pipe velocities to determine the mean and variation of loss coefficients. Additional testing was also conducted to evaluate the effect on pressure losses from spacing gaps and glue beads in the socket connections of the PVC elbows and tees. All of the tests were performed with Schedule 80 PVC pipe and PVC fittings.