Basunia, Mohammad Ali creator Gee-Clough, D. Chairperson Singh, Gajendra Examination Committee Gupta, Chandra P. Examination Committee Salokhe, Vilas M. Examination Committee The Royal Government of Netherland Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1989 continuing eng 122 p. The performance of a coil tube pump modified in AIT was evaluated both by variable speed motor and by manually. Maximum lift was found to b e 275 cm by using 1 2 turns in the coil. Suitable rpm for manual operation was found to be in between 35 to 25 rpm and within this speed range a labor can operate this pump continuous l y for 45 to 60 minutes. For lift 100-275 cm power requirement for 30 rpm was 16-72 watt and maximum discharge and efficiency were found to be 58 litre/min . and 60 % respectively . For this speed , the optimum angle of operation was found to be 24 degree (7 5 % diameter coil submergence ). Keeping average input power 30 watt (arms/ shoulder) a nd 75 watt (pedaling ) fixed cu t off points at different lifts were calculated. Best cu t - off point for 30 watt and 75 watt occurred at 25 rpm a nd 48 rpm at lift 24 0 cm and 250 cm at which efficiency was 61% and 45 % respectively. The overall performance of the coil tube pump is good. So there is a need to popularize this pump suitable for supplying irrigation water to vegetables, rice and wheat fields in the non-industrialized countries. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1989 Pumping machinery Testing Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B17818 http://203.159.5.9/ait-thesis/detail.php?q=B17818 110920 20260818224318.0