O-Mac B Series User manual

Installation operation
and
maintenance manual
AUT. N°810 EDIZ. 07-01

2
CONTENTS
B Serie lobe pump code page 3
Pump materials " 4
Introduction " 5
Preliminary checks " 5
Installation " 5
Piping system " 6
First starting " 8
General maintenance " 9
Relief Valve and manual By-pass " 11-12
Trouble shooting guide " 13
Reference tables - Rotor clearances - Tightening torque " 14
– Heating jacket and seal flushing connections " 15
– Mechanical seal overall dimensions " 15
– Bearings " 16
Instructions for assembly and disassembly - pump type B1-B2-B3-B4-B550 "17
Instructions for bearing housing assembly - pump type B1 - B2 - B3 - B4 " 22
Instructions for assembly and disassembly - pump type B5 - B6 " 25-32
Instructions for driving shaft inversion - pump type B5 - B6 " 33
Spare parts choice " 33
– Seals for pump type B1 - B2 - B3 - B4 - B470 - B490 - B550 " 33-34
– Seals for pump type B660 - B680 " 35
– By pass - relief valve " 36
– Aseptic rotor case " 37
– Jacketed end cover and rotor case " 37
– Technical drawing - pump type B105 - 110 - 115 " 38
– Technical drawing - pump type B215-220-325-330-430-440-470-490-550 " 39
– Technical drawing - pump type mod. B660 - 680 " 40
– Materials, seals and options codes " 41
– Components and rotor cases codes " 42
– Parts list - spare parts code " 43-44-45
– Technical drawing - pump type B100 " 46-47
– Seals for pump type B100 " 48
– Parts list - spare parts code " 49
– Common fluids features - Seal/Rotor preferred choice " 50-51

0 Gas - BSP ports
1 Flanged ports
2 DIN 11851 F ports
3 SMS ports
4 RJT (BS) ports
5 IDF ports
6 Clamp ports
7 Female gas thread
8 Oenological
9 Special
100
105
110
115
215
220
325
330
430
440
470
490
550
660
680
0 Standard stainless steel tri-lobe ST
1
Stainless steel tri-lobe increased clearance SM
2 Standard stainless steel bi-lobe ST
3
Stainless steel bi-lobe increased clearance SM
4
Rubber-coated stainless steel/NBR tri-lobe
5 Dual wing rotary piston in Acteon
6
Rubber-coated stainless steel/NBR bi-lobe
7 Gear rotor in Acteon
8 Stainless steel gear rotors
9 Special rotors
B SERIE LOBE PUMP CODE
3
FINISHED PRODUCT
CATEGORY
LOBE PUMP SERIE
PUMP
SIZE
SEAL
TYPE
SUCTION/DISCHARGE
PORT CONNECTIONS
ROTOR
TYPE
TYPE OF END
COVER
SPECIAL
VERSIONS
B110 5 2 0 0 CRV
B
0Type UM (lip seal)
1Teflon packing rings
2Teflon packing rings + hydraulic barrier
3 SS/Carbon balanced mech. seal
4
Tung. Carbide/Carbon balanced mech. seal
5 Tung. Carbide/Tung. Carbide balanced mech. seal
6 Ceramic/Carbon balanced mech. seal
7 Ceramic/Rulon balanced mech. seal
8
Silicon Carbide/Sil. Carbide balanced mech. seal
9 Special seals
0 Standard end cover
1 End cover with relief valve
2 End cover with heating jacket
A Aseptic pump
B External by-pass
C Single flushed mech. seal
D Duplex shafts
FPolymer/Hastelloy pump
G Inner polishing surface
H High-pressure pump
I Monel 400 pump
J Titanium pump
K Surface hardening
L Enlarged inlet port
MPolymer/Monel pump
PTeflon trim
Q Double flushed mech.seal
R Rotor case with heating jacket
S S1 polymer lip seal
T Hydraulic flange pump
U EPDM trim
V Viton trim
WPolymer/Titanium pump
Y Hastelloy pump
Z Hastelloy/Titanium pump
EXAMPLE:

4
PUMP MATERIALS
Bearing housing G 25 cast iron
Gear cover serie B1 - B2 - B3 - B4 Aluminium
serie B5 - B6 G25 cast iron
Rotor case and end cover standard AISI 316 stainless steel
optional Titanium degree 2
optional Hastelloy C 276
optional Mekton S polymer
Shaft (driving driven) standard AISI 316 stainless steel
optional Titanium degree 5
optional Hastelloy C 276
Rotors – standard clearance ST standard AISI 316 stainless steel
and increased clearance SM optional Titanium degree 2
optional Hastelloy-alloy C 276
– rubber coated AISI 316 stainless steel insert
+ N.B.R. (EPDM, VITON)
– dual wing or bi-lobe standard
Stainless steel anti-seizure alloy (Acteon)
optional Dew 88 met alloy
optional AISI 316 stainless steel
optional Titanium degree 2
optional Hastelloy-alloy C 276
SHAFT SEALS
code 0 "UM" lip seal standard Viton
optional Polymer S1
code 1-2Teflon packing rings Lubricated P.T.F.E.
code 3 B.T. C5E B2GVGG or Fluiten KL2A Z32Y1DJE mech. seal AISI 316 stainless steel/Carbon
code 4 Roten U7K X73Z7-HX or Fluiten KL2A Z32K22DJE mech. seal Tungsten Carbide/Carbon
code 5 Roten U7K X7337-HX or Fluiten KL2A K22K22DJE mech. seal Tungstene Carbide/Tung. Carb.
code 6 B.T. C5E B2V1VGG or Fluiten KL2A Z32CDJE mech. seal Ceramic/Carbone
code 7 B.T. C5E YV1VGG mech. seal Ceramic/Rulon
code 8 Fluiten KL2A U32U31VJE mech. seal Silicon Carbide/Silicon Carbide
code Q Fluiten KL2A double mech.seal standard (other by request) Required materials

1. INTRODUCTION
This handbook contains the necessary instructions for the right use and maintenance of the OMAC lobe pumps.
Before installing the pumps, you should read and respect carefully the following rules in order to avoid mistakes which
maycompromise the performance. Forspecial applications, not covered bytheserules,our technical office is at yourdisposal
for further suggestions.
2. PRELIMINARY CHECKS
1 - Remove the possible protection caps, arranged on the outlet and inlet ports.
2 - Disassemble the front cover and check that inside the pumping body there are no foreign bodies or dust.
3. - Choose the running direction for a right pump positioning. In standard versions the direction is reversible, i.e.: by
inverting the rotation direction the outlet becomes inlet.
4. - Be sure on installation you have respected all the safety measures in use concerning the protections of the running
parts and of the heated parts above 60°C with "overheated area" indication. Check also the protections of the "dangerous
area" are no sparking.
5
3. INSTALLATION
3.1 - POSITIONING
1 - If the pump is delivered in bareshaft version, the coupling with the motorization should be entrusted to qualified
staff.Ajoint misalignement can cause a damaging stress, that may produce vibration in the pipeline and accelerated
pump wear.
2 - In choosing the speed, at which the pump must run, consult carefully the chart, given by manufacturer, about
medium viscosity (see technical handbook and table at page 46).
3 - If the pump is delivered with motor, coupling and base, the assembling has been carried out at our works.Anyway
check to see that no damage has occurred during transit.
4 - Where possible we advise you to fix the base to floor; after bolting down, re-check the alignement pump-motor
and correct it, if necessary, by introducing shims under the base.
5 - In some applications height adjustable feet are normally used, because they allow a regular cleaning under the
base.
3.2 - PIPING SYSTEM
1 - OMAC pump suction and discharge are sized to suit passage of even very viscous medium; consequently the
piping should not be necessarly proportionate to them.
2 - The suction and discharge piping should be sized according to the calculus in the technical handbook, considering
the expected capacity, viscosity and friction losses.
3 - The lobe pumps can work with great friction losses in outlet, but not in inlet, where we advise as large and short
piping as possible in order to have a lower NPSH that the available one.

4 -The pump should be installed near the source, from which it sucks.
5 -Reduce at min. bends and necks along the whole line.
6 -Use large radius bends, avoiding Tees and needless runs.
7 -Check the perfect inlet connection seal not to reduce the pump suction power.
8 - The piping weight must not load on pump body and the
connection must be carried out without forcing in order to
avoid overloads and distortion of the rotor case.
9 - Especially in case of very long piping system isolation
valves on both inlet and outlet side to permit pump
maintenance and removal without total draining of the piping
system.
10 - Where possible arrange a flexible expansion joint to
reduce vibration and to avoid forcing, due to thermal
expansion of piping.
11 - We advise to arrange gauges and vacuum gauges near
the pump. They are usefull to check the pump working
conditions and diagnose possible trouble such as:
– pressure overload
– flow absence
– instability in duty conditions
– cavitation
12 - Where necessary arrange on inlet a filter, whose suction area must not be smaller than 4-5 time the suction pipe
to minimize the friction losses.
13 - During the pump unit installation it's necessary to leave a usefull room for maintenance and possible removal.
14 - If the pump is not flooded, arrange on inlet side a "foot" valve or a check valve to keep the priming.
6
Fig. 5
Fig. 4
Fig. 3
Fig. 2

15 - The horizontal sections of the suction pipe must be a bit inclinated towards to the top in order to avoid the creation
of air pockets, which can damage the pump priming.
16 - In vacuum sucking reduce at min. the friction losses
due to suction pipe. Arrange a check valve on outlet side
in order to:
– avoid the air or liquid reflux during the pause so that to
keep the piping completely full;
– to make easier the starting on load.
7
RIGHT WRONG
Air
→
A = foot valve
B = check valve
Fig. 6
RIGHT
WRONG
Air
→
Air
→
Fig. 7
Fig. 8
VACUUM
VACUUM

3.3 - FIRST STARTING
1 - The terminal board connection and the thermic setting, made according to the maximum allowable absorption,
must be carried out by qualified staff and following the instructions of the electric motor plate (❤ ∆).
2 - Wash the piping by means of clean water to remove foreign bodies, drosses and load.
IMPORTANT: Don't use a lobe pump for the a.m. duty.
3 - Check all the gates on inlet and outlet are completely open.
4 - With dry lobes, the lobe pump has got a very low sucking power, therefore if the pump is not flooded, fill the rotor
case and the suction pipe by means of liquid.
IMPORTANT: Lobe pumps can run even dry, because the moving parts are not in touch, except for slip faces of the
seals which, expecially at high speed, tend to get overheated. Therefore we suggest you should not let the pump run
dry for long time in order to avoid seal wear. The allowed time for dry running depends on turning speed and on
materials of seal slip faces (5 minutes for PTFE or carbon and 15 seconds for carbide).
5 - In pumps with flushed seals and heating jacket, check all these devices are regularly connected and the liquid
used for flushing, above all for stuffing box seals with hydraulic barrier, is consistent with the pumped fluid.
6 - Check the right direction of pump rotation according to the position of the driving shaft. In standard versions the
direction of rotation is reversible.
8
Fig. 9
Fig. 10

7 - Start the pump possibly at reduced speed, then increase it till it reaches the duty speed, checking possible troubles
(pressure overload, loss in piping, cavitation, vibration).
8 - If the duty speed is very high, it's normal that the bearing housing temperaturs reaches 50-60°C, expecially during
the first working hours.
4. GENERAL MAINTENANCE
4.1 - LUBRICATION
1 - OMAC pumps are delivered ready filled with oil of ISO VG 68.
9
Advised lubricants Tab. 9 Oil quantity Tab. 10
DUTY TEMPERATURE
da –20°C a + 90°C da +90°C a + 150°C
MAKE
ESSO
SHELL
CASTROL
BP
MOBIL
AGIP
FINA
SPARTAN EP 68
OMALA OIL 68
ALPHA SP 68
ENERGOL GR-XP 100
MOBILGEAR 626
BLASIA 68
GIRAN 100
SPARTAN EP 150
OMALA OIL 150
ALPHA SP 150
ENERGOL GR-XP 150
MOBILGEAR 629
BLASIA 150
GIRAN 150
PUMP TYPE LITER
B100
B105 - B110 - B115
B215 - B220
B325 - B330
B430 - B440
B470 - B490
B550
B660-B680
0,2
0,5
1
2,2
4,5
6,7
15
30
2 - Check every day the oil level arranged on pump side, which must be completly filled with the pump off.
3 - When necessary top up using the lubricant oil as per Tab. 9.
4 - If the pump is used with vertical openings invert the plug position with the oil level.
5 - The oil replacement should be carried out after running-in of about 150 working hours, then after every 2500 hours.
6 - If the bearing housing works constantly with temperatures over 90°C, lubricate by means of oil with higher viscosity
(see Tab. 9) and replace it every 1000 working hours.
4.2 - SINGLE BALANCED MECHANICAL SEALS Fig. 23 - 24
1 - The mechanical seals require no maintenance.
2 - If a leakage occurs, because of contact surface wear, replace the complete seal (see disassembling instructions).
3 - In case of long working with worn seals, check the pruduct doesn't enter the bearing housing.
4 - IMPORTANT: Don't work the simple mechanical seals dry.
4.3 - FLUSHED MECHANICAL SEALS Fig. 25
1 - As well as the single mechanical seals, the flushed mechanical seals require no maintenance.
2 - When the mechanical seal is replaced, replace the turning ring (224) and the lip ring (223) of the auxiliary seal
too.
3 - With a well connected flushing, the pump can work even with no product being pumped, because the seals can
not become overheated.
4 - Check the fluxing is efficient during the pump working, in order not to damage the auxiliary seals (see connection
diagram Fig. 9).
5 - To disassemble the flushed mechanical seals, see single mechanical seals instructions.
6 - To remove the stationary part of the mechanical seal, remove the flushing box from the rotor case.
7 - During the assembling, before inserting the rotating part of the mechanical seal, put rightly the turning ring (224)
and assemble the auxiliary sealing ring (223) in its seat on the flushing box (220) according to drawing Fig. 25.
4.4 - SEALS BALANCING
1 - All the mechanical seals of the lobe pumps are balanced, that is with stationary part locked by a special balancing
ring 210 - 230 (Fig. 23 - 24 - 25).

10
2 -The balancing of the mechanical seal is indispensable when the pressure, measured on pump outlet, is about or
exceeds 10 bar.
3 -The balancing is suggested even for low duty pressure, when there are:
– pressure peaks due to first breakaway
– extremely viscous products
– frequent starting
– fragile or soft seal material (graphite, ceramic, PTFE).
4.5 - PACKING GLANDS Fig. 28 - 29
1 - Initial adjustement of the packing glands should be carried out during commissioning.
2 - After the pump has run for a few hours, the packing will have compacted and a further adjustment is necessary,
taking care to leave a slow drop to provide lubrication of the packing.
3 - When the dropping loss is too big and further tightening is no more possible replace packing rings as well as shaft
protection bush.
4.6 - LIP SEALS Fig. 27
1 -The lip seals are composed by a support, in which two lip gaskets type UM are arranged: one turned inside for
product sealing and the other turned outside for suction sealing. The shaft is protected by a bush in AISI 316.
2 -During the assembling, check the lip gaskets are rightly arranged on the support (244).
3 - Assemble the supports on rotor case, lubricate by means of grease between the gaskets and insert the bushes
(241).
4 -Being the gaskets already seated, assemble the rotor case and tighten the socket head screws of the bushes,
locking them on the shaft.
4.7 - CAUTIONS
1 - If the product is subjet to easy drying, crystallization or decantation, it's necessary to wash pump and piping system
at the end of each work or at the beginning of a long plant pause.
2 - The reversibility of the rotation direction, peculiarity of all OMAC pumps, allows the product return, emptying
discharge piping.
3 - If the pump hasn't run for long period, at starting check the sealing devices are not blocked, turning by hand the
pump shaft.
4 - If the product is subject to congelation or solidification, before starting, check the pumps and piping are not blocked
by solids, created during the pause.
4.8 - DAILY CHECK
1 - Visual check of all sealing devices and of general working.
2 - If a leakage from mechanical seal occurs, arrange a replacement as soon as possible in order to avoid the product
enters the bearing housing.
4.9 - WEEKLY CHECK
1 - Check the oil level of the pump and of the motor unit; if necessary top up by means of oil according to manufacturer
instructions.
2 - Check the rotor case and clean it, removing possible product deposits.
3 - Check that no siezures between rotors or among rotors and static surfaces of rotor case have occurred.
4 - Check the by-pass valve, when arranged, is not blocked after long working pause. To see it, it's necessary to
untighten completely the adjusting screw (59) and re-arrange it in its initial position, indicated by retainer (62)
Fig. 21.
4.10 - SIX MONTH CHECK
1 -If the pump works constantly at high temperature, over 120°C, check the lubricant oil health; if it has become dark,
arrange its replacement.
2 - Check the timing gears don't allow the rotors get in touch; otherwise replace the worn gears.
3 - Check the shaft stiffness; if they show a min. axial or radial play, replace the bearings.

11
4 - Check the corrosion of the bearing housing; if necessary arrange its repainting by means of a paint, suitable to
protect it from a quick wear. The OMAC standard pumps are painted with: BRIGHT EPOXID ENAMEL RAL 7032.
If you carry out these checks sistematically, the pump will keep its initial performaces for many years.
5. - RELIEF VALVE AND MANUAL BY-PASS
5.1 - RELIEF VALVE
1 - Arranging a safety valve, directly on pump or plant, is always suggested to save the pump in case of wrong acts,
which may cause overpressure peaks.
2 - If the pump hasn't got a relief valve, it can not work with even partly blocked outlet pipe.
3 - Upon request OMAC pumps can be delivered with relief valve.
4 - The relief valve, directly arranged on pump end cover, is reversible and driven by a spring, register compressed.
5 - The relief valve adjustment must be carried on pump working because the recycle consistency depends on pump
speed, product absolute weight and viscosity.
6 - In order to avoid continuous vibrations, the relief valve must be adjusted in such a way that it starts working with
a pressure over 10% of duty pressure.
5.2 - RELIEF VALVEADJUSTMENT Fig. 21
1 - Start the pump with the relief valve, still loose, i.e. with the spring not under pressure.
2 - Tighten the adjustment screw (59), compressing gradually the spring, checking the pressure on pump outlet doesn't
exceed the max. allowed pressure.
3 - Acting on adjustment screw and checking by means of a probe, find out the valve critical opening point, under the
required pressure.
4 - Compress the spring for 1/4 screw turn over the critical point in order to avoid vibrations.
5 - Put the register clamp (62) and tighten it by means of a suitable socket haed screw (65).
Fig. 11

12
5.3 - MANUAL BY-PASS VALVE
1 - The relief valve can be used even as manual by-pass to adjust the capacity.
2 - Loosening the register screw (59), release the pressure on the spring so that to remove the piston (57) from the
pumping chamber, letting part of the pumped liquid go back into the sucking chamber.
3 - This operation is not allowed with volatile liquids or with products sensitive to temperature increase, due to the
product continuous recycle.
4 - For products with viscosity over 15.000 Cps, if you have to recycle the whole pumped product, we suggest you
should arrange on line a by-pass, rightly proportionate, so that it allows the whole flow transit.
Fig. 12

13
6. - TROUBLE SHOOTING GUIDE
No flow Insufficient flow Irregular flow Pump loses prime Pump blocks as soon as it starts Pump gets overheated Motor gets overheated Pump absorbs too much power Pump is noisy or vibrates Rotors wear out Seals wear out quickly Pump seizes
INCONVENIENCES
CAUSES
REMEDIES
Wrong rotation direction 1. Invert it
•
•Unprimed pump 2. Fill pumping chamber and feeding piping with liquid, expelling
air
3. Increase flushing height, enlarge suction piping diam, reduce
suction piping lenght and bends, reduce pump speed and medium
Not enough flushed temperature, check the viscosity increase is suitable to motor
power
Air enters inlet 5. Check and tighten suction piping connections, tighten the packing
gland, if necessary replace it
Product evaporates at inlet 4. Remedies as per par. 3
Air is in suction 6. Remedies as per par. 2
piping
Not enough flushed in 7. Increase product level, lower suction opening position
suction container
Dirty or blocked valve or 8. Clean them
suction filter
Excessive product viscosity 9. Reduce pump speed, increase product temperature
Insufficient product viscosity 10. Increase pump speed, decrease product temperature
Excessive product temperature 11. Decrease product temperature, cool pumping chamber
Insufficient product temperature 12.
Increase product temperature, heat pumping chamber (within the
limits given by manufacturer)
Suspended particles in 13. Clean suction pipe, arrange on inlet a filter
product
14. Remove possible obstructions in outlet piping, clean it,
Excessive back pressure enlarge its diam., reduce lenghts and bends of outlet
piping
Too tight packing 15. Loosen packing gland and tighten it rightly (see instructions)
Too loose packing 16. Tighten packing gland rightly (see instructions)
Insufficient seal liquid 17. Check liquid flow and if necessary increase it
Excessive pump speed 18. Decrease pump speed
Insufficient pump speed 19. Increase pump speed
Press on rotor 20. Check piping alignment, insert flexible joints, sustain piping
case
Belt slips 21. Strech it
Not alined joint 22. Adjust alignment between pump and drive device
Pump or drive device not 23. Tighten anchor bolts, re-checking alignment
fixed on base
Worn out bearings 24. Have them replaced by manufacturer
Worn out or unsynchronized 25. Replace them or adjust them according to manufacturer's
gears instructions
Wrong quantity or quality 26. Act according to manufacturer's instructions
of gear oil
Parts in touch rotor case 27. Check plan pressure and duty pressure, contact manufacturer
Worn out rotors 28. Replace them
Check valve leaks 29. Check valve adjustment, check and clean sealing devices, if
necessary replace parts
Check valve vibrates 30. Check valve adjustment (see instructions), check and clean valve
31. Adjust spring compression, so that valve opens with a pressure
Check valve is bad adjusted over 10% of duty pressure.
•••• •
••• •
••• •
••• ••••• •
••• ••••••••
•
•••••
•••••••
•••••••
••• ••
••• • •
••• ••
•••• •
••
••••• •
••• • •• ••• •
••• ••
•
•
•• ••• •
••• •••
••
••
••

Tab. 14 - Tightening torque - Nm
Tab. 13 - ROTOR CLEARANCES
14
ABCDABCDABCD S
B100 0,12 0,12 0,15 0,20 0,15 0,15 0,20 0,20 0,07 0,08 0,12 0,15 0,12
B105 - B110 0,14 0,14 0,15 0,30 0,19 0,19 0,22 0,30 0,07 0,08 0,20 0,20 0,14
B115 0,14 0,14 0,18 0,30 0,19 0,19 0,22 0,30 0,07 0,08 0,20 0,20 0,14
B215 0,15 0,15 0,18 0,30 0,22 0,23 0,32 0,30 0,07 0,08 0,20 0,20 0,15
B220 0,15 0,17 0,23 0,30 0,25 0,25 0,32 0,30 0,07 0,08 0,20 0,20 0,15
B325 0,17 0,17 0,20 0,35 0,25 0,25 0,32 0,35 0,10 0,10 0,25 0,20 0,17
B330 0,17 0,19 0,23 0,35 0,27 0,28 0,32 0,35 0,10 0,10 0,25 0,20 0,17
B430 0,18 0,18 0,22 0,35 0,27 0,27 0,32 0,35 0,10 0,10 0,25 0,20 0,18
B440 0,18 0,18 0,22 0,35 0,27 0,27 0,32 0,35 0,10 0,10 0,25 0,20 0,18
B470 0,20 0,20 0,27 0,35 0,32 0,32 0,35 0,35 0,10 0,10 0,25 0,20 0,20
B490 0,20 0,20 0,27 0,35 0,32 0,32 0,35 0,35 0,10 0,10 0,25 0,20 0,20
B550 0,22 0,22 0,35 0,40 0,32 0,32 0,40 0,40 0,15 0,15 0,35 0,25 0,22
B660 0,27 0,27 0,35 0,50 0,37 0,37 0,50 0,50 0,27
B680 0,27 0,27 0,35 0,50 0,37 0,37 0,50 0,50 0,27
B100
B1
B2
B3
B4
B470
B5
B6
Rotors in AISI 316
ST version Rotors in AISI 316 SM version Rotors in S.S. anti-seizure alloy Shaft
jut
Dimension in mm - Tolerance 0/+0,03
Pump size Pos. 8 gear adjustment
Key size
(mm) Torque (Nm)
A=7
B=4
B=5
B=6
B=8
B=8
A=19
A=24
3,5
8
12
29
52
52
88
203
Pos. 42 rotor locking
Key size
(mm) Torque (Nm)
A=17
A=27
A=30
A=38
A=46
A=46
A=46
A=60
27
83
127
350
520
520
520
750
Pos. 52 rotorcase
Key size
(mm) Torque (Nm)
A=10
A=13
A=17
A=19
A=24
A=30
A=22
A=22
7
18
32
54
127
223
54
83
Pos. 51 end cover
Key size
(mm) Torque (Nm)
A=10
A=13
A=17
A=17
A=19
A=22
A=19
A=22
7
18
32
54
54
83
54
83
Key type: A= hexagonal-head, B= Allen, socket head
Equivalences:1 mm= 0,0394 inches

15
Tab. 15 - Heating jacket and seal flushing connections
Cylindrical GAS thread UNI 228 - Dimensions in mm
Tab. 16 - Mechanical seal overall dimensions in mm
B100 B1 B2 B3 B4 B470 - 490 B5 B6
A–1/8" 1/8" 1/8" 1/8" 1/8" 1/8" 1/4"
B–1/4" 1/4" 1/4" 1/2" 3/4” 3/4” 3/4"
C 1/8” 1/4" 1/4" 1/4" 1/2" 3/4” 3/4” 3/4"
D5675100 122 150 180 230 300
B100 B1 B2 B3 B4 B470-490 B5 B6
d120 30 35 50 65 80 65 100
d629 39 44 62 77 95 77 115
d735 45 50 70 85 105 85 125
L129,1 29,1 29,1 34,1 38,8 43,8 38,8 41,3
L244 44 44 50 55,5 59 55,5 85
L319,1 19,1 19,1 21,1 25,8 25,8 25,8 25,8
L410 10 10 13 13 18 13 15,5
L52222,52,5 3 2,5 3
L655566767
L799999999
L82 9,5 14 14 16 21 45 56

16
1 - The bearings of pump types B1 - B2 - B3 - B4 are composed by 2 off single row taper roller bearings, a spacer for inside
rings and a spacer for outside rings.
The assembling of type SET-RIGHTTM, of TIMKEN company, is carefully carried out by our staff in order to grant an ideal
rolling without clearances.
Therefore these bearings must be directly requested to OMAC, that supply them already pre-assembled for the right
pre-loading.
2 -The bearings for pump type B5 - B6 are according ISO norms of straight roller type and double ball crown type, everywhere
available.
3 - The bearings life time depends on duty conditions (speed, pressure, absorbed power). Calculus about bearing life time
will delivered, upon request, only if duty conditions are well know.
Tab. 17 - Bearings
Pump
size
Bearings pre-assembled
front rear
B1
B2
B3
B4
32006 X
32008 X
32010 X
32014 X
32007 X
32008 X
32012 X
Pump
size
ISO Bearings
front rear
B100
B5
B6
NJ 2216 E
NJ 224 E
NATB 5904
3214
3220
Fig. 13 - Bearing SET-RIGHTTM
TLA 3020 Z
LRT 253020

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8. - INSTRUCTIONS FOR ASSEMBLY AND DISASSEMBLY. PUMP TYPE B1 - B2 - B3 - B4 - B550
Fig. 14 - Cross section type B105 - B110 - B115
Fig. 15 - Cross section type B215 - B220 - B325 - B330 - B430 - B440 - B550

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ROTOR CASE DISASSEMBLY - PUMP TYPE B1 - B2 - B3 - B4 - B550
1. Remove the front nuts and exert laverage in the
provided slots on cover. 2. Unscrew anticlockwise the rotor nuts, interposing a non metal element between the rotors, making them
stop rolling.
3. Take care of the reference marked on rotors and
shafts (1-2) so that you will set them rightly while re-
assembling.
4. Extract the rotors, taking care you don't damage them
by means of metal tools.
5. Unscrew the back nuts and extract the rotor case. 6. Extract the stationary part of the mechanical seal from
rotor case.

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7. Untighten the socket head screws on mechanical
seal. 8. Extract the rotating part of the mechanical seal from the shaft.
9. IMPORTANT!
During the following operations, take care you don't
damage the lapped seal surface; don't lay them on
the bench and handle them with clean hands.
10. Clean carefully the shafts.
Lubricate lightly the O-ring and introduce the rotating
part of the seal, possibly by means of a conical
bush.
Exert pressure only with hands; avoid using metal
tools.
11. Be sure the mechanical seals stand on the shaft
shoulder and tighten by degrees the socket head
screws. We suggest you should use a thread locking
adhesive in order to avoid their untightening on
work.
12. Assemble the stationary part of the seal on rotor
case, taking care to aline the slot with the retainer
pin, already arranged on seat bottom.
ROTOR CASEASSEMBLY Mod. B1 - B2 - B3 - B4 - B550

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13. Clean carefully the seal slide surfaces and
assemble the rotor case delicately in order not to
damage the seals and be sure it is well set on plugs.
Clamp the back nuts.
14. Assemble the rotors, setting them on pitch setting,
according to reference marks (1-2). Clamp the rotor
nuts (see tab. 14). In order to stop turning, interpose
a non metal element between rotors
15. After disassembling the rotor case, remove the oil
and the drive key on shaft. 16. Remove the gear cover and make a reference mark on gears in order to respect the right timing while
re-assembling.
17. Disconnect the retainer keys on lock washers. 18. Unscrew the retainer ring nut, inserting a non metal
wedge between gears in order to stop turning.
BEARING HOUSING DISASSEMBLY - PUMP TYPE B1 - B2 - B3 - B4