CALPEDA

SKU:BNM4 25/160B/A | 61800022000

NM - NMS

Bronze

Delivery Time: For delivery lead times on this product, please contact the office.

Calpeda BNM4 | BNMS4 Bronze 4-Pole Centrifugal Pumps:

Quiet-running bronze pumps for clean water circulation in marine, HVAC, and industrial systems

Flow: Model-dependent
Head: Lower head per kW than 2-pole models (approx. up to 45 m)
Power: Typically up to 15 kW (larger models in BNMS4)

Performance:
The Calpeda BNM4 and BNMS4 are close-coupled centrifugal pumps with 4-pole motors, designed to operate at lower speeds (≈1450 rpm) for quieter, more controlled flow. These bronze versions are ideal for applications involving treated, coastal, or mildly aggressive water, especially where smoother hydraulic characteristics are preferred.

Applications:
Suitable for:

• Heating and cooling circulation systems

• Water supply and distribution

• Marine and coastal applications

• Process water in industrial environments

• Irrigation systems with lower pressure demands

Construction:

• BNM4: Extended shaft motor directly connected to a single-impeller pump

• BNMS4: Stub-shaft construction for use with standard motors, includes integrated thrust bearing

• Bronze pump casing, lantern bracket, and impeller (CC480K EN 1982)

• Carbon-ceramic mechanical seal with NBR elastomers

• Fully painted for additional corrosion resistance

• Threaded ports ISO 228/1 (BS 2779)

Operating Conditions:
Liquid temperature: -10 °C to +90 °C
Ambient temperature: Up to 40 °C
Suction lift: Up to 7 m
Max working pressure: Up to 10 bar
Continuous duty (S3 60% for single-phase motors ≤1.8 kW)

Motor:
4-pole induction motor, 50 Hz (n ≈ 1450 rpm)
Three-phase: 230/400 V up to 3 kW, 400/690 V from 4 kW
Insulation class F, protection IP54
Frequency converter compatible (from 0.37 kW for BNM4)
IE2 (single-phase ≤1.1 kW), IE3 (three-phase >0.65 kW)
Built to EN 60034 and EN 60335 standards

Delivery:
Free UK mainland delivery from Pumps and Gearboxes Direct