i am taking a design course in pipework and sanitary and now we are taking a section where we need to design pipe sizes by estimating their diameters , so we have a table one for steel and the other is for copper pipes, the complicated things comes in when we want to choose the diameter for the pipe depending on the flow rate demanded by consumers note:- (all cold water supply)to illustrate more-further a good example of that is when we want to design a pipe diameter for a copper pipe that is connected to a bath demanding a flow of 0.9 l/s i get stuck here there is so many options to take from the tables !!the teacher is unclear and have no specific criteria about how to choose the most fitting pipe diameter !!so what to do ?? please i need help in this one
I'm not a rocket scientist, but I do work with pipe now and then! The most obvious answer would be to find the size required for flow and then choose the next larger size available. I used an online calc. and found that .9 would require a pipe diameter of 27 mm or 1.1 inches. Here in the US, I would go with a 1 1/4 inch pipe! Not sure what metric pipe goes by.
calculator: irrigation.wsu.edu/Content/Calcul.
I'm not a rocket scientist, but I do work with pipe now and then! The most obvious answer would be to find the size required for flow and then choose the next larger size available. I used an online calc. and found that .9 would require a pipe diameter of 27 mm or 1.1 inches. Here in the US, I would go with a 1 1/4 inch pipe! Not sure what metric pipe goes by.
calculator: irrigation.wsu.edu/Content/Calcul.
The difference between copper pipe, PVC and steel pipe are really not significant in terms of inside diameter and internal roughness. The main variables are pipe diameter, flow rate and the length of the run. The tables are usually based on an assumed pressure drop per foot of length. If we had a copy of the table you are using then you might get a bit more help. The link below is a good example of a table from the plumbing code that uses supply pressure, length and size to determine the correct choice.
