EHEDG Lobe Pump

Features & Benefits of Pomac Pumps’ Lobe Pump

• Speed range up to 1500 rpm
• Fully EHEDG Compliant
• Wide Variety Interchangeable Sealing Options – Modular design
• Complete Front Pull-Out of Mechanical Seal & Lobes
• High-Efficiency B-Wing or Low Pulsation Quattro Lobe Designs available
• Flat Front Cover to ensure more efficient cleaning
• Can be mounted Horizontally or Vertically in pipework
• When mounted vertically the pump is self-draining
• Accurate flow control from 0.04 – 2.5 l/rev
• Discharge Pressures up to 15 Bar
• Variable fluid temperatures up to 140ºC
• CIP/SIP friendly – minimal dead spaces
• Suitable for Shear Sensitive Fluids
• Suitable for pumping fragile solids
• Wide variety of connection types
• Optional Heating & Cooling Jackets
• Optional Air or Spring Loaded Integral Safety Valves
• ATEX Rated

 

Traditional Construction VS Advanced PLP Construction

Traditional Construction Disadvantages

• Long shaft overhang
• Shaft deflection
• Sensitive to temperature shock
• No Front Pull Out construction
• Not CIP approvable
• Heavy construction

Advanced PLP Construction Advantages

• Short shaft overhang – Less expansion of shaft due to high temperatures during CIP procedures.
• Very low shaft deflection
• Less sensitive to temperature shock
• Complete stainless steel design – enhanced cleanliness
• Modular design: All mechanical seal variants can be fitted to the same housing & pump can easily be switched from horizontal to vertical execution – all holes for mounting feet are pre-drilled.
• Front Pull Out construction
• CIP cleanable
• “Lightweight” construction

Sanitary Lobe Pump Applications

• Viscous & vulnerable Dairy products such as Yoghurt, Custard, Butter & Curdled Milk
• Bakery products such as Dough, Fat, Paste, Fondant, Creams
• Beverages such as Beer, Fruit Juice, Lemonade
• Cosmetic products such as Creams, Shampoos etc…
• Meat products such as Chopped Meat, Extracts, Animal Food
• Egg products such as Albumen, Yolk
• Viscous food products such as Sauces, Salads, Soups, Glucose Syrup, Chocolate
• Starch products such as Mashed Potatoes

 

For industrial applications, please visit the MG Industrial Rubber Lobe Pump.

Technical Information

Max Capacity	110 m³/hr
Max Pressure	15 Bar (25 Bar upon request)
Max Viscosity	<1’000’000 cPs
Max Temperature	140ºC
Max Solids Passage	60 mm – Model & Screw Type Specific
Lobes	Bi-Wing or Quattro Lobe
Connections	¾” – 4”
Connection Types	Couplings: DIN11851, DIN11864-1, SMS1145 Flanges: EN1092-1, Rectangular, DIN11864-2, ANSI Tri-Clamps: ISO2852, DIN32676, DIN11864-3
Shaft Sealing	Single mech. seal SIC/SIC or TC/TC Double mech. seal SIC/SIC or TC/TCWDR Lip Seal Single O-ring Double O-ring with quench
Sealing Materials	SiC / SiC or Tungsten / Tungsten
Elastomer Materials	EPDM, Viton, NBR, Teflon, KALREZ, e.g. according to FDA
Wetted Parts	AISI 316L (AISI 316L Mo Ni or Hastelloy CX2MW N26022 upon request)
Surface Roughness	<0.8 Micron (Std.), <0.5 upon request (Mechanical & Electro-Polished)
Hardening	Hard Inchromizing & Plasma Nitriding (Optional)
Drives	Standard: IEC, IE2, B3/B5, IP55, isolcl. F, PTC Optional: IE3, ATEX, CSA/UL, Decentralised variable speed drive

Capacity Range

Pump Model	Displacement Litres / 100 Rev	Max Solids Passage mm	Max Pressure Bar	Max Speed Rpm	Weight Kg
PLP 1-¾	4.2	13	15	1500	12
PLP 1-1	6	13	15	1500	12.5
PLP 1-1.5	10	13	15*	1200	14
PLP 1.5-2	20	22	8	1200	21
PLP 2-1.5	22	23	15	1200	37
PLP 2-2	30	23	15	1200	39
PLP 2-2.5	36	23	15*	1000	44
PLP 3-2	55	37	15	1000	101
PLP 3-3	100	37	15	1000	105
PLP 3-4	130	37	15*	750	115
PLP 4-4	250	52	15	750	250

 

*Depends on the gap between the rotor and pump casing.

The values mentioned above are maximum values. The operational values may be lower because of the liquid characteristics of the system design

Dimensional Data

 

Pump Type	D	CA	CB	FA1	FA2	FB	FC1	FC2	FD	FE	FF	FG	PA	PB	SA	SB	SC	SD	SE1	SE2	SE3
PLP 1-¾	NW15	84	65.5	114	168	50	136	190	72	19	9	41.5	177.5	219	30	15	25×5	137	111.5	56.5	57
PLP 1-1	1″	84	84	114	168	50	136	190	72	19	9	44.5	177.5	226	30	15	25×5	137	111.5	56.5	57
PLP 1-1.5	1.5″	84	77.5	114	168	50	136	190	72	19	9	50.5	177.5	245	30	15	25×5	137	111.5	56.5	57
PLP 1.5-2	2″	97	106	132	194	50	154	216	72	19	9	57.5	203	295	45	20	40×6	172.5	129	65	66
PLP 2-1.5	1.5″	123	111	162	248	80	190	276	106	24	11	57.5	253	344	48	25	40×8	219	165.5	80.5	80
PLP 2-2	2″	123	113	162	248	80	190	276	106	24	11	62.5	253	355	48	25	40×8	219	165.5	80.5	80
PLP 2-2.5	2.5″	123	118	162	248	80	190	276	106	24	11	67	253	367	48	25	40×8	219	165.5	80.5	80
PLP 3-2	2″	164	141	218	332	106	250	364	138	30	13	63	334	468	70	40	60×12	317	221.5	106.5	107
PLP 3-3	3″	164	135	218	332	106	250	364	138	30	13	75.5	334	498	70	40	60×12	317	221.5	106.5	107
PLP 3-4	4″	164	160	218	332	106	250	364	138	30	13	90.5	334	526	70	40	60×12	317	221.5	106.5	107
PLP 4-4	4″	230	214	338	472	142	378	512	182	58	18	99.5	463	675	98	55	90×16	448	310	150	163

PLP Lobe Pump Performance Curves

Q_TOT = Q_TH – Q_L, 

P_TOT = P_TH + P_V

PLP 1-¾

PLP 1-1

1-1.5

PLP 2-2

PLP 2-2.5

PLP 3-2

PLP 3-3

PLP 3-4

PLP 4-4

PLP Mechanical Seals

PLP Sanitary Lobe Pump is available with several, interchangeable, shaft sealing options. They are modularly built and are front pull-out by design making replacement and re-assembly very quick and easy. The type of sealing is dependent on the application requirements and can be supplied in the following variants & material combinations:

• M1 = single mechanical seal SIC/SIC

• M2 = double mechanical seal, quenched, SIC/SIC

• M4 = single mechanical seal TC/TC

• M5 = double mechanical seal, quenched, TC/TC

• O1 = single O-ring seal

• O2 = double O-ring seal, quenched

• L3 = WDR Lip Seal

Materials: Silicon Carbide/Silicon Carbide and Tungsten Carbide/Tungsten Carbide sliding rings Elastomers: NBR, EPDM, Viton, PTFE, Kalrez

Safety Relief Valve

The PLP Sanitary Lobe Pumps can be fitted with either Spring-Loaded or Air Operated Safety Relief Valves. The opening pressures of which are adjustable by means of a set screw. The valve is mounted directly to the pump cover to facilitate easy maintenance and to guarantee optimal hygienic conditions. When the valve is opened a by-pass is created between the pressure and suction sides of the pump. When the differential pressure within the pump head exceeds the pre-set value on the valve, the valve will open and protect the pump from the deadheading. Below is a table detailing the models of pumps which can be fitted with either type:

 

Safety Relief Valve Type	PLP 1-¾ PLP 1-1 PLP 1-1.5	PLP 1.5-2	PLP 2-1.5 PLP 2-2 PLP 2-2.5	PLP 3-2 PLP 3-3 PLP 3-4	PLP 4-4
Spring Loaded	X	X	X	X
Air Operated					X

 

Heating/Cooling Jackets

PLP Lobe Pumps can be fitted with Heating / Cooling Jackets to maintain fluid temperatures which are optimal to the pump performance and system requirements. These are supplied in the following variants:

• H1 = Heating Jacket on the Front Cover

• H2 = Heating Jacket on the Rotor Case

• H3 = H1 H2
• H4 = Electrical Heating Cover

Spare Parts

Operating Principle

The PLP Sanitary Lobe Pump is a Rotary Positive Displacement Pump. Its operation is based on the counter-rotation of 2 lobes in the pump casing. Both lobes are mounted onto their own shafts which are supported by bearing cartridges mounted directly onto the pump casing. One of the pump shafts is externally driven and an internal gear assembly drives the other shaft in the opposing direction. The screws rotate synchronously in opposing directions without touching.

When the lobes rotate and pass the suction port the volume between them increases and create a vacuum which causes the liquid to enter the suction port and the pump casing. During the rotation of the lobes, a fixed amount of fluid is conveyed through the pump. As the lobes approach the discharge port the volume between them decreases which creates a pressure build-up, causing the fluid to flow out of the discharge port.