Gianneschi BMA-S 32/110B2 — Self-Priming Double-Volute Centrifugal Pump (01ABM3211B204)
The Gianneschi BMA-S 32/110B2 (part number 01ABM3211B204) is a compact, single-stage enblock self-priming centrifugal pump built with full marine-grade bronze construction and a 316 stainless steel shaft. Engineered around a double-volute design and paired with an IEC-flanged three-phase motor operating at 230/400V AC, 50Hz, 2900 RPM, this unit delivers 0.55 kW of output power while maintaining impressive flow performance across a wide delivery range — all with notably low energy consumption. The extended impeller hub design covers the motor shaft and allows for an oversized mechanical seal, sharply reducing the risk of water ingress or shaft-seal contact during operation.
What makes this pump a dependable workhorse is the combination of its fast self-priming action, corrosion-resistant materials, and the efficiency gained from the double-volute configuration. The four-bladed bronze open impeller and bronze bi-channel volute work together to evacuate air rapidly and pull liquid in, even from dry starts. This design makes the BMA-S 32/110B2 well-suited for a broad range of liquid transfer tasks — from cooling circuits, water supply systems, and emptying applications to ballast, gray water, and general-purpose industrial pumping where a reliable low-power centrifugal unit is required. Designed and manufactured in Italy, Gianneschi's BMA-S series reflects decades of precision engineering in demanding fluid-handling environments.
Key Features
- Self-priming double-volute centrifugal design for fast, reliable liquid pickup
- Full marine-grade bronze pump body, impeller, and diffuser as standard
- 316 stainless steel shaft for superior corrosion resistance
- Four-bladed bronze open impeller with bi-channel volute for high flow efficiency
- Oversized high-quality mechanical seal with extended impeller hub protecting motor shaft
- IEC-flanged motor mount for standardized motor compatibility and easy servicing
- High flow rate achieved with limited power draw (0.55 kW)
- IP55-rated motor enclosure, Insulation Class F
- Designed and manufactured in Italy to EN ISO 9906 tolerances
Applications
- Cooling water circulation systems
- Water supply and pressure systems
- Tank and vessel emptying operations
- Ballast water transfer
- Gray water and bilge-style drainage systems
- Air conditioning and HVAC water circuits
- Chain washing and deck wash-down systems
- Fire suppression support and firefighting supply
- OEM industrial liquid transfer integration
- Swimming pool and reservoir filling
Specifications
- Part Number: 01ABM3211B204
- Model: BMA-S 32/110B2
- Motor Type: Three-Phase (3Ph) AC
- Voltage: 230/400V AC
- Frequency: 50 Hz
- Motor Speed: 2900 RPM
- Power Output: 0.55 kW (0.75 HP)
- Max Total Head: 12 m H₂O
- Max Flow Rate: ~200 L/min (12 m³/h)
- Pump Body Material: Marine-Grade Bronze
- Impeller Material: Bronze (4-bladed open)
- Shaft Material: 316 Stainless Steel
- Seal Type: High-Quality Mechanical Seal (oversized)
- Motor Protection: IP55
- Insulation Class: Class F
- Inlet / Outlet Port Size: DN 32 (approx. 1¼") suction and discharge DN 32 is a standardized metric designation in plumbing and piping systems, representing a Nominal Diameter of 32 millimeters. It translates roughly to an 1 ¼-inch (or 5/4") nominal size in the imperial system
- Standards Compliance: EN ISO 9906
Frequently Asked Questions
Q1. What does the "B2" designation mean in the BMA-S 32/110B2 model number?
The "B2" suffix identifies the motor type as a three-phase AC motor. In the Gianneschi BMA-S naming convention, "B1" typically denotes single-phase and "B2" indicates a three-phase configuration, making this unit suitable for facilities and equipment wired for three-phase power at 230/400V.
Q2. Can the Gianneschi BMA-S 32/110B2 run dry without damaging the pump?
Dry running is not recommended for this pump. The mechanical seal and internal components rely on the pumped liquid for lubrication and cooling. Extended dry operation can damage the mechanical seal, leading to leakage. A strainer on the suction line and proper priming practices are advised before every start.
Q3. What liquid types is the BMA-S 32/110B2 suitable for pumping?
This pump is designed to handle clean, low-viscosity liquids and moderately loaded fluids compatible with bronze and stainless steel. Typical uses include fresh water, seawater (with appropriate material compatibility), cooling water, gray water, and similar non-aggressive fluids. It is not rated for highly corrosive chemicals, flammable liquids, or abrasive slurries without consulting Gianneschi directly.
Q4. How difficult is it to replace the mechanical seal on this pump?
The BMA-S 32/110B2 is an enblock (single-unit) design, and the mechanical seal is accessible without fully disassembling the motor. Replacement seal kits specific to the BMA-S 32/110 series are available from Gianneschi and authorized distributors. Seal replacement should be performed by a qualified technician familiar with centrifugal pump servicing.
Q5. Is this pump compatible with variable frequency drives (VFDs)?
The three-phase motor on the BMA-S 32/110B2 is in principle compatible with VFD operation, which can allow speed and flow control. However, motor protection ratings (IP55, Class F insulation) and specific motor winding characteristics should be verified with Gianneschi or the motor nameplate data before connecting a VFD, as harmonics and reduced cooling at low speeds can affect motor life.
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