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]
Pump type	Number of stages	L	a	W	H	h	Ds	Dt	Weight m [kg]
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]
Pump type	Nr of stages	Capacity Q [m³/h]	Head H [m]	Motor rated power P_s [kW]	Capacity Q [m³/h]	Head H [m]	Motor rated power P_s [kW]	Capacity Q [m³/h]	Head H [m]	Motor rated power P_s [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.