Type Z

Qmax=800m3/h – Hmax=2500m 

APPLICATION

Z-type pumps are designed to operate as boiler feeding pumps in power plants.

They can also be applied in any other industrial application where clean, hot water of pressure up to 230 bar is required.

DESIGN

Horizontal, multistage, ring-section centrifugal pumps designed to handle hot water. The pumps are supported at the axis. Both suction and delivery flanges are directed vertically upwards. Version with the suction flange directed downwards is also available. The axial thrust is absorbed by a balance disk. In order to protect the balance disk during start-up the pumps are equipped with an additional axial Mitchell type bearing, which supports the balance disk during the transient period before the pump reaches the full operating speed. The slide bearings are oil lubricated with forced lubricating system consisting of auxiliary oil pump, oil filter and cooler. The pumps are equipped with mechanical seals.

Typically, Z type pumps are delivered with auxiliaries such as: suction filter, minimal flow valve, pressure gauges, temperature and vibration sensors.

MATERIALS OF CONSTRUCTION

The materials of construction are selected for hot, demineralized boiler water. Chromium steel and chromium cast steel are applied as standard for main pump elements. Alternative, special materials can be selected if necessary.




No.

Part name

No.

Part name

1 Mechanical seal 15 Shaft
2 Stuffing box cover 16 Bearing housing
3 Tie bolt 17 Bush
4 Suction casing 18 Stuffing box
5 Impeller 1 19 Shield
6 Impeller 20 Balance disk
7 Stage casing with bleeder 21 Stuffing box spacer
8 Stage casing 22 Stuffing box
9 Stator 23 Stuffing box cover
10 Stator 24 Mechanical seal
11 Discharge casing 25 Bearing housing
12 Superbolt nut 26 Bush
13 Thrust bearing housing 27 Dish spring
14 Thrust bearing cover 28 Counter balance disk


Pump
type

Number
of stages

Dimensions [mm]

Weight
m [kg]

L

a

W

H

h

Ds

Dt

15Z28 3 1782 350 1280 1330 700 200 150 2500
4 1872 440 2620
5 1962 530 2740
6 2032 620 2860
7 2122 710 2980
8 2212 800 3100
9 2302 890 3220
10 2392 980 3340
11 2482 1070 3460
12 2572 1160 3580
13 2662 1250 3700
15Z33 3 1887 390 1450 1547 747 200 150 2600
4 1987 490 2760
5 2087 590 2920
6 2187 690 3080
7 2287 790 3260
8 2387 890 3420
9 2487 990 3580
10 2587 1090 3800
15Z40 4 2314 600 1630 1695 845 250 200 4509
5 2439 725 4786
6 2564 850 5063
7 2689 975 5340
8 2814 1100 5617
9 2939 1225 5894
10 3064 1350 6171
11 3189 1475 6448
12 3314 1600 6725



Pump
type

Nr of
stages

3000 [rpm]

3920 [rpm]

4660 [rpm]

Capacity
Q [m3/h]

Head
H [m]

Motor
rated
power
Ps [kW]

Capacity
Q [m3/h]

Head
H [m]

Motor
rated
power
Ps [kW]

Capacity
Q [m3/h]

Head
H [m]

Motor
rated
power
Ps [kW]

15Z28 3 160 225 570 630 275 780 1250
4 760 800 1040 1250
5 575 500 950 1000 1300 1600
6 690 630 1140 1250 1560 2000
7 805 630 1330 1600 1820 2000
8 920 800 1520 1600 2080 2500
9 1135 800 1710 2000
10 1250 1000 1900 2000
11 1365 1000
12 1480 1250
13 1595 1250
15Z33 3 300 390 765 1250 465 1080 2000
4 600 800 1020 1600 1440 2500
5 750 1000 1275 2000 1800 3150
6 900 1250 1530 2500 2160 4000
7 1050 1250 1785 2500
8 1200 1600 2040 3150
9 1350 1600
10 1500 2000
15Z40 4 500 660 800 2000 5400
5 1000 1900 1700 4000 2500 6600
6 1200 2200 2040 4800
7 1400 2600 2380 5500
8 1600 2900
9 1800 3200
10 2000 3600
11 2200 3900
12 2400 4200

The parameters are specified for clean water of density ρ=1000 kg/m3 and temperature T=15°C.