How to select rotary lobe pumps

How to select and specify rotary lobe pumps

When specifying lobe pumps there are several factors to bear in mind.

Whether the application is sanitary or not. If it is sanitary to what level of certification is required.
Generic considerations such as flow, differential pressure and chemical compatibility.
Viscosity is important with lobe pumps as different designs can cope with differing viscosities. ECP pumps are generally better with higher viscosities.
How shear sensitive is the liquid? A slow running ECP would offer the lowest shear rate when it comes to lobe pumps.
Fluid sensitivity to temperature is another factor to bear in mind with slower running ECP pumps offering the best solution.

Always be cautious when it comes to using a smaller model running at a faster running speed as this could be the most expensive option when you include maintenance costs.

Product Series	Type	FDA	EHEDG	3-A	ATEX	Max Flow	Max Pressure	Max Viscosity	Shear
DW	Hygienic lobe pumps	●	●	●		350	30	700 cP	Low
Universal 1	Hygienic ECP lobe pumps	●	●	●	●	102	13	200K cP	Very Low
Universal 2	Hygienic ECP lobe pumps	●	●	●	●	150	13.8	200K cP	Very Low
Universal 3	Hygienic ECP lobe pumps	●	●	●	●	102	34.5	200K cP	Very Low
Universal 420/520	Hygienic ECP lobe pumps	●		●	●	187	13.8	200K cP	Very Low
LB-S	Rubber lined lobe pumps					40 m3/hr	8 bar	100k cP	Low
LB-M	Rubber lined lobe pumps					130 m3/hr	10 bar	100k cP	Low