I have an air receiver to fit in an existing system basically to dampen any large loads. The receiver has a capacity of 750ltr but the compressor flow rate is 1000 CFM. Would this receiver be adequate to help resolve the issue? This from Dan (England)

Howdy Dan. Thanks for visiting and writing in.
A 1000 CFM compressor is large, and a 750 litre tank isn’t, but the real issue as I see it is what is the demand when your system requires air?
While any reservoir will help reduce pulsation from the compressor and provide reserve for the system to allow the compressor to catch up, you need to size the tank based on the draw, not necessarily the compressor size.
More info on this topic can be found right here on this website.
If that isn’t sufficient help, please add a comment.