vic008 11 Posted January 5 Report Share Posted January 5 Can anybody work out the height of head. 20L a minute TML pump. 38 mm hose (empty holding tank)thanks Quote Link to post Share on other sites
vic008 11 Posted January 5 Author Report Share Posted January 5 Like there is a limit to how high a pump can pump, called head I think. Presently need to pump up about a meter high to the anti syphon valve. Quote Link to post Share on other sites
lateral 110 Posted January 5 Report Share Posted January 5 It’s on the pump curve graph that comes with the pump. Depends on type of pump and power. Every foot of height (head)you are pumping against =0.533psi or 2.99kPa. Delivery vol will drop to zero on curve at max head for pump which is particular to your pump. Need model number and search for performance curve. Quote Link to post Share on other sites
CarpeDiem 21 Posted January 5 Report Share Posted January 5 You need to know the pump max pressure. Flow rate decreases due to the resistance of gravity and friction. To maintain flow rate, as resistance increases, the system pressure needs to increase... But what are you wanting to know? Knowing the max head height of a pump is kinda moot and only academic, cause at max head height the flow rate will be zero and the system is kind of useless. And if you were to reduce head height by a few mm, then the flow might be 1ml/hour - again a useless system. Quote Link to post Share on other sites
wheels 375 Posted January 5 Report Share Posted January 5 It's a TMC, not TML. Macerator pump, so it has a rubber impellor. Max head is about 5m mark. These will still pump at nearly full flow at that height. The head pressure is more in regards to strain on the blades of the impellor rather than actual pressure/flow. Too much restriction can cause the impellor to break off fins. Quote Link to post Share on other sites
vic008 11 Posted January 6 Author Report Share Posted January 6 Needless concern. Answer is 55' , from the maker.No macerator, diaphragm pump. Surprisingly heavy. Quote Link to post Share on other sites
wheels 375 Posted January 7 Report Share Posted January 7 In the future. more detail would be very helpful. 😒 Quote Link to post Share on other sites
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