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Chemical injection is the process whereby a chemical is pumped at a higher pressure than the current line pressure where the liquid is being pumped into. The chemical has to be pumped at a higher pressure than the line pressure in order to overcome the pressure in the line and mix with the fluid being pumped. If the chemical was pumped at a lower pressure siphoning may occur. Chemicals which may be mixed during a chemical injection process include fuel additives into petrol and diesel such...