Double Suction Pump - Leaqua – R&D-Focused Water Tank Engineering Specialist

High-capacity double-suction centrifugal pump

Introduction

SBS (standard) and SBSL (long-coupled) series horizontal split-case double-suction pumps feature axial split casing for easy maintenance without disturbing piping or motor. The double-suction impeller design eliminates axial thrust, providing smooth operation, high efficiency, and extremely low NPSH requirements.

Product Advantages

Flow up to 10,000 m³/h
Head up to 200 m
Motor power up to 2,500 kW
Double-suction impeller → axial thrust balanced
Horizontal split casing → easy maintenance
High efficiency up to 90%+
Flange ratings: PN10/PN16/PN25
Materials: cast iron / stainless steel options

Typical Applications

Municipal water supply
Irrigation schemes
Power plant cooling
Industrial circulation
HVAC primary pumps
Flood control
Raw water intake
Fire water systems

Performance Overview by Model

Model	Rated flow (m³/h)	Rated flow (l/s)	Flow range (m³/h)	Max head (m)	Speed (rpm)	Motor power (kW)	Discharge DN (mm)	Material
SBS150-300A	150	41.7	90–220	30	1450	22–30	150	Cast iron
SBS150-400	150	41.7	90–220	50	1450	37–45	150	Cast iron
SBS200-400	200	55.6	120–300	50	1450	45–55	200	Cast iron
SBS200-500	200	55.6	120–320	80	1450	75–90	200	Cast iron
SBS250-400	250	69.4	150–400	50	1450	55–75	250	Cast iron
SBS250-480	250	69.4	150–420	65	1450	75–90	250	Cast iron
SBS300-400	300	83.3	180–500	50	1450	75–90	300	Cast iron
SBS300-480	300	83.3	180–520	65	1450	90–110	300	Cast iron
SBS350-500	350	97.2	200–600	70	1450	110–132	350	Cast iron
SBS350-600	350	97.2	200–620	90	1450	160–200	350	Cast iron
SBS400-500	400	111.1	250–700	70	1450	132–160	400	Cast iron
SBS400-600	400	111.1	250–720	90	1450	200–250	400	Cast iron
SBS500-600	500	138.9	300–900	90	1450	250–315	500	Cast iron
SBS500-700	500	138.9	300–950	110	1450	355–400	500	Cast iron
SBS600-700	600	166.7	400–1100	110	1450	400–450	600	Cast iron
SBS600-800	600	166.7	400–1150	130	1450	500–560	600	Cast iron
SBS700-800	700	194.4	500–1300	130	1450/980	560–630	700	Cast iron
SBS800-840	800	222.2	550–1500	84	725/980	400–500	800	Cast iron
SBS800-970	800	222.2	550–1550	97	725	560–630	800	Cast iron
SBS900-1000	900	250.0	600–1700	100	725/980	630–710	900	Cast iron
SBS1000-1100	1000	277.8	700–2000	110	725	800–1000	1000	Cast iron
SBSL (long-coupled)	up to 5000	–	custom	up to 200	740/985	up to 2500	up to 1400	Cast/SS

Materials of Construction

Component	Standard material	Optional material
Casing (upper & lower)	Cast iron HT250	Stainless steel / Ductile iron
Impeller	Cast iron / Bronze	Stainless steel AISI304/316
Shaft	Carbon steel 45#	Stainless steel 2Cr13 / AISI420
Wear rings	Cast iron / Bronze	Stainless steel
Shaft sleeve	Stainless steel	Hardened stainless steel
Mechanical seal	Graphite/SiC	Tungsten carbide / custom

Axially split casing: remove top half without disturbing piping or motor
Double-suction impeller: hydraulic axial thrust balance
Renewable wear rings for economical maintenance
Heavy-duty bearings with oil lubrication
Flanges drilled per ISO 7005-2 / PN10/PN16/PN25

installation dimensions & weight (reference)

Model	DN suction (mm)	DN discharge (mm)	Length L (mm)	Width B (mm)	Height H (mm)	Weight (kg)
SBS150-300	150	150	850	550	480	380
SBS200-400	200	200	1050	680	600	620
SBS250-480	250	250	1250	800	720	950
SBS300-480	300	300	1350	900	820	1250
SBS350-600	350	350	1550	1050	950	1850
SBS500-700	500	500	1850	1300	1150	2850
SBS800-970	800	800	2350	1650	1450	5200

Key advantages of SBS/SBSL double-suction pumps: High flow capacity, low NPSH requirement, balanced axial thrust (no thrust bearing needed), easy maintenance (split casing), high efficiency up to 90%+, smooth operation with low vibration, long service life.