Model studies of a curved suction pipe of pumping unitsOleg Glovatskiy, Sherali Sharipov, Azamat Saparov, Alexander Gazaryan, Naira Nasirova and Sirojiddin SaydullaevE3S Web of Conf., 410 (2023) 05016DOI: https://doi.org/10.1051/e3sconf/202341005016