Calculation methodology for determining the number of simultaneous self-starting pumping unitsK.G. Abidov, O.O. Zaripov, A.I. Rakhmatullaev, N.O. Zaripov and Sh.O. ZaripovaE3S Web Conf., 289 (2021) 07003DOI: https://doi.org/10.1051/e3sconf/202128907003