EBARA ENR Serie Manual De Instrucciones Y Mantenimiento página 19

Nominal nozzle side, DN
Range Maximun speed
Capacity / Head (max.)
Characteristics
Fluids Temperature
Maximun allowable pressure
Pump casing
Impeller
Materials
Shaft
Shaft sleeve
Impeller type
Construction Bearings
Shaft seal
Drive Motor
Accesories With motor
Sahft seal
Bearings
Optional
Coupling
Flanges
(1)
Pump sizes from 80-400 to 300-500, except 150-500
(2)
Pump size 150-500
(3)
Check operation limits depending on pumped fluid
6.2 Piping
(1) Avoid force transmission from suction and
discharge pipes to pump by installing strong
enough supports.
(2) Install check valves (between the pump and
the discharge valve) in the following cases:
- Very long pipes.
- When the manometric head is high.
- In automatic operation position.
- When supplying to a pressure tank.
- In parallel operation.
(3) Install automatic vent valves at those points
where the formation of air pockets cannot be
avoided. Nevertheless, they should not be pla-
ced in locations where the pressure is lower
than atmospheric pressure. In those cases the
vent valves draw in air instead of take it out.
(4) To reduce the effect of water hammer, install
SPECIFICATIONS
32 ~ 350 (DIN 2532 PN10, EN 1092-2)
3000 r.p.m./50 Hz ~ 3600 r.p.m./60 Hz
-20 ~ +120º C
16 / 10 (1) / 14
Cast iron GG25
Stainless steel AISI 420 (1.4021)
Stainless steel AISI 420 (1.4021)
Mechanical seal Silicon carbide / Carbon / EPDM
Gland packing: flax fiber / PTFE
Oil lubricated ball bearings
Table 1
a non-return valve with spring.
(5) Installations with suction lift (see Fig. 1):
- The end of the suction pipe has to be installed
at least twice as deep as the pipe diameter (2D),
and at the same time, 1 to 1.5D from the bottom
of the tank.
- Install a foot valve with a strainer in the end of
the suction pipe to avoid the intake of strange
particles.
- Suction pipe must be installed with an upward
slope (>1%) towards the pump to avoid the for-
mation of air pockets. Joints of pipes and acces-
sories will be carefully done to prevent air inta-
ke.
- Make sure that the suction pipe is as short and
straight as possible, avoiding bends and unne-
cessary pipe lines. Do not install any shutoff
valve in this part of installation.
2000 m3/h / 150 m.c.a.
Clean liquids
+120 ~ +170º C
(2) bar 14 / 9
Cast iron GG25
Bronze G-CuSn10
Closed radial
Greased ball bearings
Electric, explosion, steam
Common base
Coupling
Coupling guard
Coupling with spacer
Standard ANSI 150
(ENGLISH)
(1) / 8 (2) bar
(3)
19