Flowserve TB-MAG INNOMAG - Manual (Page 15)

INNOMAG® TB- MAG™ ASME and ISO SEALLESS ENGLISH 26999988 06-14
Page 15 of 44
The maximum discharge pressure must be
less than or equal to the P-T rating. Discharge
pressure may be approximated by adding the
suction pressure to the differential pressure
developed by the pump.
Figure 3-1
Temperature - °C (°F)
-29
(-20)
-18
(0)
38
(100)
93
(200)
121
(250)
Pressure - barg (psig)
ASME
B16.42
Class
150
17.2
(250)
17.2
(250)
17.2
(250)
16.2
(235)
15.5
(225)
ASME
B16.42
Class
300
20.7
(300)
20.7
(300)
20.7
(300)
20.7
(300)
20.7
(300)
EN
1092-2
(ISO)
PN 16
16
(232)
16
(232)
16
(232)
16
(232)
16
(232)
JIS
B2239
10K
14
(203)
14
(203)
14
(203)
14
(203)
14
(203)
3.5.3
Energy Efficiency Operation of Pumps
The pump supplied will have been selected from
Flowserve’s extensive product line to have
optimum efficiency for the application. If supplied
with an electric motor then the motor will meet or
exceed current legislation for motor efficiency.
However it is the way the pump is operated which
has the greatest impact on the amount and cost of
energy used during the operating life of the pump.
The following are key points in achieving minimum
operating cost for the equipment:
a) Design the pipe system for minimum friction
losses
b) Ensure that the control system switches off the
pump when not required
c) In a multi-pump system run the minimum
number of pumps
d) Try to avoid systems which by-pass excess
flow
e) Avoid as far as possible controlling pump flow
by throttle valves
f) When commissioned, check that the pump
operates at the duty specified to Flowserve
g) If it has been found that the pump head and
flow exceed that required, trim the pump
impeller diameter
h) Ensure that the pump is operating with
sufficient NPSH available.
i) Use variable speed drives for systems which
require variable flow. A VFD for an induction
motor is a particularly effective way of
achieving speed variation and energy/cost
reduction
j) Notes for VFD usage
a) make sure that the motor is compatible
with VFD
b) Do not over-speed the pump without
checking the power capability with
Flowserve
c) On systems with high static head,
speed reduction is limited. Avoid
running the pump at a speed which
gives low or zero flow
d) Do not run at a low speed and flow rate
which lets solid settle out of
suspension in the pipe work
e) Do not use a VFD for a fixed flow
requirement; it will introduce power
losses
k) Select high efficiency motors
l)
If replacing a standard motor with a high
efficiency motor it will run faster and the pump
could take more power. Reduce the impeller
diameter to achieve energy reduction
m) If the pump system pipe work or equipment is
changed or process duty is changed, check
that the pump is still correctly sized
n) Periodically check that the pipe system has
not become corroded or blocked
o) Periodically check that the pump is operating
at the flow, head and power expected and that
the efficiency has not reduced with erosion or
corrosion damage.
4 INSTALLATION
Equipment operated in hazardous locations
must comply with the relevant explosion protection
regulations. See section 1.6.4, Products used in
potentially explosive atmospheres.