Hydraulic Graph Paper and other useful stuff

You will find a collection of documents that you can download and use which will be useful for fire protection engineers.  If you would like to see something added, then please get in touch and we will see if we can help.

BS9251: 2014 - Square law graduation graph

BS 9251: 2014, Annex C.5 ‘Maximum flow demand calculations’ require the tank size to be calculated using the most favourable demand point which is then intersected with the pump curve to find the maximum flow demand for the system which is often referred to as Qmax.  By multiplying the Qmax by the system minimum duration time you have the required effective capacity of the tank.

It a very simple method to find the Qmax is if you have graph paper with the x-axis (flow) scale graduated with an exponent scale of 2. This is commonly known as square law graduation graph or paper     

Square law graduation graph for Qmax calculations
Square law graduation graph to download
We have a number of different graphs papers with various scales for you to download and use on your our projects
2 bar - 100 L/min
3 bar - 150 L/min
5 bar - 500 L/min

Isometric Graph Paper

BS 9251: 2014, Annex C.5 ‘Maximum flow demand calculations’ require the tank size to be calculated using the most favourable demand point which is then intersected with the pump curve to find the maximum flow demand for the system which is often referred to as Qmax.  By multiplying the Qmax by the system minimum duration time you have the required effective capacity of the tank.

It a very simple method to find the Qmax is if you have graph paper with the x-axis (flow) scale graduated with an exponent scale of 2. This is commonly known as square law graduation graph or paper     

Isometric graph paper to download for free
The isometric graph paper which we offer can be printer out on to A4 paper with 5mm separations.
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