Model studies of a curved suction pipe of pumping units Oleg Glovatskiy, Sherali Sharipov, Azamat Saparov, Alexander Gazaryan, Naira Nasirova and Sirojiddin Saydullaev E3S Web of Conf., 410 (2023) 05016 Published online: 09 August 2023 DOI: 10.1051/e3sconf/202341005016