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符号说明D——管线内径;D_s——清管球的平均外径;ΔP_s——包括清管球在内的压差;ΔP——不包括清管球在内的压差;P_s——推动清管球附加压力,P_s=ΔP_s-Δp;A-B——在点 A 和 B 之间测得的数值;A-C——在点 A 和 C 之间测得的数值;
Symbol Description D-- pipeline diameter; D_s-- mean diameter of pigging ball; ΔP_s-- pressure differential including pigtail ball; ΔP-- pressure difference excluding pigtail ball; P_s-- Ps = ΔP_s - Δp; AB - the value measured between points A and B; AC - the value measured between points A and C;