O.M.A.C. s.r.l.
Via Giovanni Falcone, 8 42048 Rubiera (RE) - Italy Tel.0522/629371 - 629923 Fax 0522/628980
Rev.4 del 01/2011 O.M.A.C. s.r.l.
PUMP TYPE
FORCES [N] TORQUES [Nm]
Fx Fy Fz EF Mx My Mz EM
B100 65 55 75 113 110 85 70 140
B105 B110 B115 105 95 120 186 125 100 90 164
B215 145 130 160 252 130 110 95 172
B220 190 180 220 342 140 115 100 183
B325 210 200 250 383 150 120 110 197
B330 B390 240 230 280 435 160 130 110 206
B430 B440 255 245 300 464 175 150 130 230
B470 B490 260 250 305 472 180 150 130 234
B550 340 340 355 598 190 160 150 255
B660 B680 405 405 440 722 200 180 170 276
STAGE 3: CONNECTION TO THE PLANT
The suction inlet and delivery outlet of the B series lobe displacement pumps, included in the LDPU, are sized for the passage of even very viscous
products, consequently the pipes do not necessarily need to be proportionate to them.
The suction and delivery pipes must be sized according to the calculations indicated in the O.M.A.C. technical manual, in relation to capacity, viscosity
and pressure loss that one wants to achieve.
Displacement pumps can operate with signifi cant pressure losses in delivery, but not in suction where it is recommended to use pipes as large and short
as possible to maintain the NPSH required by the pump, part of the LDPU, lower than the NPSH available in the plant of the Customer.
The LDPU must always be installed as close as possible to the source from which it must suck up.
During STAGE 3 relating to the CONNECTION TO THE PLANT it is recommended to avoid the following situations:
• In the case of very long piped, install a gate on the inlet and one on the outlet of the pump, to facilitate inspection without emptying the whole
unit uselessly.
• it is recommended to fi t manometers and vacuum gauges as close as possible to the pump. They will be very useful to check the standard ope-
ration conditions of the pump and diagnose any inconveniences such as: pressure overloads, absence of fl uid, work conditions instability, cavitation.
• protect the pump from hard solid bodies entering. Where possible install a suction fi lter: the fi ltering area must not be less than 4-5 times the
pipe section to minimise pressure losses.
• where possible, fi t fl exible expansion joints to reduce vibrations and prevent forcing due to thermal dilations of the pipes.
STAGE 4: FIXING THE LINE AND COMPLEMENTARY PROTECTIONS
The LDPU can be fi xed in three ways, described below:
ATTENTION
If the LDPU has been supplied in the full fairing version and the fairing, or other parts of the unit, have been removed to facilitate on site positioning
operations of the LDPU, one must re-fi t these parts on the LDPU before completing the fi xing operations of the unit.
a) Fixing onto a metallic structure.
If one must fi x the LDPU to a metallic structure, use the special pre-drilled holes on the support base. With ref. to the following drawings, for the distances
between the holes and the dimensions of bolted connections to use, see the table below, where for every kind of base size and its measurements “A” and
“B”, there are the sizes of the bolts for fi xing to the metal structure:
• reduce the amount of bends and
narrowing as much as possible all along the
line;
• using long range bends avoiding to
use “T” fi ttings and avoid unnecessary runs.
• check the complete air tightness of
the suction fi ttings in order not to decrease the
suction power of the pump.
• The weight of the piping must not
rest on the pump body and it must be con-
nected without using force to prevent overload
and distortion of the pump body.
(A)
(B)
(C)
(D)
(E)
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