In-line Pumps SonFlow / DanPumps S-IP & S-MP
The S-IP and S-MP series are vertical, single-stage, in-line centrifugal pumps designed for water, seawater, and low-viscosity industrial fluids. The range covers flow rates up to 650 m³/h with DN40–DN250 flanged connections, PN10/PN16 pressure classes.
Construction and Standards
Hydraulic design follows ISO 2858 principles. Flanges comply with EN 1092-1. Manufacturer certifications include ISO 9001:2015 and CE marking.
Material options by variant:
- S-IP: Cast iron casing and cover.
- S-MP: Bronze/RG10 casing and cover for seawater and high salinity applications.
- Common components: Impeller and wear rings in Ni-Al-Bronze, shaft in AISI 329.
S-IP/S-MP and S-IP/S-MP-2L Versions
The standard S-IP/S-MP is used for small to medium flows. The 2L version is specified for higher flows and continuous duty, featuring double bearing support between motor and impeller and a flexible coupling to reduce vibration transmission to the rotating assembly.
Applications
Typical use cases:
- Seawater or freshwater circulation in marine systems
- HVAC, chilled water, and hot water circuits
- Industrial process water networks
- Aquaculture systems
- Auxiliary fire-fighting circuits
- Chemical processes with compatible wetted materials
The in-line configuration minimizes piping direction changes and reduces required installation footprint in plant rooms.
Maintenance and Sealing
Top pull-out design allows removal of motor, upper section, and impeller as a single unit without disconnecting pipework. Replaceable wear rings limit internal leakage losses between impeller and casing.
Motor and Options
Pumps are fitted with IEC IP55 electric motors, compliant with IEC 60034-30 and Ecodesign requirements. ATEX versions are available for classified zones.
FAQ
When is S-MP selected over S-IP?
For seawater or when bronze wetted parts are required.
When is the 2L version considered?
For continuous operation, higher flows, or installations where independent bearing support and flexible coupling reduce mechanical stresses.






















