Cyclones are common using in Desilters and 4" and 5" is the right one. below is the 4" and 5" parameters

1	Name	Hydrocyclone
(1-1)	Model	4"
(1-2)	Inner diameter	100mm
(1-3)	Feed diameter	16mm,26mm
(1-4)	Overflow diameter	40mm
(1-5)	Angle of cone	20
(1-6)	Max size	1.0 mm
(1-7)	Separation size	20-60 microns
(1-8)	Treating capacity	8.0m3/h
(1-9)	Material	Polyurethane
(1-10)	Connection	Clamp
(1-11)	Feed pressure (Mpa)	0.1-0.3
(1-12)	Net weight	11.5 kgs

2	Name	Hydrocyclone
(2-1)	Model	5"
(2-2)	Inner diameter	150mm
(2-3)	Feed diameter	26mm,30mm
(2-4)	Overflow diameter	40mm
(2-5)	Angle of cone	20
(2-6)	Max size	1.5mm
(2-7)	Separation size	30-100 microns
(2-8)	Treating capacity	15m3/h
(2-9)	Material	Polyurethane
(2-10)	Connection	Clamp or Flange
(2-11)	Feed pressure (Mpa)	0.05-0.3
(2-12)	Net weight	12.0 kgs