Injection assembly, injection pump, and method for supply of additive to a fluid in a pipe

An injection assembly configured to supply a predetermined amount of an additive from a reservoir to a fluid in a pipe, the injection assembly comprising:

• a pipe portion comprising a first end and an opposite second end, which pipe portion is configured to be coupled in line with the pipe;
• two fluid-tight couplings, arranged to respectively couple the first end and the second end of the pipe portion to the pipe in a fluid-tight manner;
• and
• an injection pump comprising:
• an electromagnetic linear motor comprising a stator and a movable armature that is configured to be driven reciprocatingly with respect to the stator,
• a pump portion comprising a piston and an additive inlet chamber, wherein the piston is coupled to the armature, and is configured to reciprocate in said additive inlet chamber, thereby, in use, alternatingly compressing and decompressing a volume of said additive inlet chamber with a compression stroke and decompression stroke, and
• an additive outlet chamber in direct fluid communication with the pipe portion and arranged in fluid communication with the additive inlet chamber;
• wherein, in use, a first decompression stroke of said piston discharges a predetermined amount of said additive from said reservoir into said additive inlet chamber, a consecutive compression stroke of said piston causes said additive to flow from the additive inlet chamber into the additive outlet chamber, and a consecutive second decompression stroke of said piston causes the additive to be directly injected into the pipe portion from the additive outlet chamber.