ISO 9001:20154-Pole Motor1450 RPMHigh-Head Pump
Monoblock SPM Pump — Slow Speed, High Pressure
The monoblock SPM (Slow Phase Motor) pump from Rinku Engineers runs at 1450 RPM instead of 2900 RPM, delivering higher head, lower noise, and 2–3x longer bearing life. It is the preferred choice for high-rise buildings, boiler feed systems, RO plant high-pressure feed, and pressure boosting where high pressure and silent operation are essential.
Quick Specifications
25+
Years Experience
900+
High-Rise Installations
30+
Countries Exported
4.7★
Customer Rating (186 reviews)
35,000+
SPM Pumps Delivered
About the Product
The Monoblock SPM Pump — Slow Speed, High Head, Long Life
The Monoblock SPM Pump is a close-coupled centrifugal pump powered by a 4-pole (1450 RPM) motor instead of the standard 2-pole (2900 RPM). The slower rotational speed means lower NPSH requirement, reduced cavitation risk, lower noise (60–65 dB), and bearing life that lasts 2–3x longer than equivalent 2-pole pumps. The result is a compact, quiet, reliable pump built for high-head applications.
As a leading monoblock SPM pump manufacturer in India, Rinku Engineers offers the MSPM series in single-stage configurations up to 70 m head and multi-stage configurations up to 150 m head. The monoblock construction removes the need for a separate baseplate, coupling, and alignment, saving installation time, footprint, and cost.
Our SPM pumps are available with a cast iron body and cast iron or SS304 impeller for standard duties, plus SS316 wet-end variants for mildly corrosive service. The MSPM-HT high-temperature variant uses upgraded mechanical seals, bearings, and cooling provisions for boiler feed water up to 120°C.
As a trusted monoblock SPM pump supplier and exporter, Rinku Engineers maintains ready stock of 12 SPM models across 1, 2, 3, and 4-stage configurations, from 1 HP to 15 HP. Custom voltage, frequency, single-phase, and skid-mounted booster package options are available.
Product Overview
ISO 9001:2015 certified manufacturing facility4-pole, 1450 RPM slow-speed designUp to 70 m single-stage and 150 m multi-stage head1, 2, 3, and 4-stage configurationsCompact close-coupled design — no alignment needed90°C standard / 120°C high-temperature variantCI, SS304, and SS316 wet-end options60–65 dB(A) low-noise operationCE, ISI, and BIS compliant options1-year warranty, extendable with AMC
Why Industries Choose MSPM
“Our 14-story residential tower needed 90 m head with silent operation. Rinku’s 7.5 HP monoblock SPM pump delivered both — zero vibration and four years of maintenance-free service.”
— Project Engineer, Premium Residential Tower, Mumbai
30 m³/hr
Max Flow Rate
70 m / 150 m
Single / Multi-Stage Head
1–15 HP
Power Range
1450 RPM
4-Pole Motor Speed
Key Features
Engineered for High Head, Built for Longevity
Every monoblock SPM pump is designed around the slow-speed principle to deliver measurable benefits in head, noise, and service life.
How It Works
Monoblock SPM Pump Working Principle
A 4-pole 1450 RPM motor drives the impeller at half the speed of standard pumps. In multi-stage models, fluid passes through successive impellers to build high pressure with smooth, low-vibration operation.
Technical Data
Monoblock SPM Pump Specifications
Complete technical parameters for the MSPM series across single-stage, 2-stage, 3-stage, and 4-stage configurations. Custom voltages, materials, and stage counts are available on request.
| Parameter | Specification |
|---|---|
| Product Series | MSPM (Monoblock SPM — Slow Phase Motor) |
| Pump Type | Close-Coupled Monoblock, 4-Pole, Single / Multi-Stage Centrifugal |
| Motor Poles / Speed | 4-Pole / 1450 RPM at 50 Hz (1750 RPM at 60 Hz) |
| Stages Available | 1, 2, 3, and 4 stages (custom on request) |
| Flow Rate (Q) | Up to 30 m³/hr (500 LPM) |
| Total Head (H) | Up to 70 m (1-stage) / 100 m (2-stage) / 130 m (3-stage) / 150 m (4-stage) |
| Operating Pressure | Up to 15 bar (217 psi) |
| Power Rating | 1 HP to 15 HP (0.75 kW to 11 kW) |
| Suction Size | 32 mm to 65 mm (1.25″ to 2.5″) |
| Discharge Size | 25 mm to 50 mm (1″ to 2″) |
| Casing Material | Cast Iron (CI Grade 200/250); SS304 / SS316 on request |
| Impeller Material | Cast Iron, Bronze, SS304, SS316 |
| Shaft Material | SS410 / SS420; SS316 on request |
| Mechanical Seal | Carbon vs Ceramic standard; SiC/SiC HT variant; John Crane Type 2 optional |
| Operating Temperature | Up to 90°C standard / up to 120°C MSPM-HT |
| Max Viscosity | Up to 100 cSt standard |
| Noise Level | 60–65 dB(A) at 1 m distance |
| Motor Brand | Crompton / Havells / ABB (IE2 / IE3 efficiency, 4-pole) |
| Phase / Voltage | 3-phase 415V ±10%, 50 Hz; 1-phase 220V on request |
| IP Rating | IP55 standard / IP66 optional |
| Insulation Class | Class F (155°C) with Class B temperature rise |
| Mounting | Horizontal foot-mounted, close-coupled monoblock |
| Base Frame | Integrated monoblock — no separate baseplate required |
| Paint / Finish | Sandblasted SA 2.5, epoxy primer + polyurethane top coat |
| Certifications | ISO 9001:2015, CE, ISI, BIS |
| Testing Standards | Hydrostatic test at 1.5× design pressure; performance test per IS 14220 |
| Warranty | 1 year standard, extendable to 2 years with AMC |
Product Variants
Choose the Right SPM Configuration
The MSPM series is available in four stage configurations and three specialty variants to match head, temperature, and fluid requirements.
Industries & Applications
Where Monoblock SPM Pumps Excel
The MSPM series is preferred for high-head, low-to-medium flow applications across industries in India and export markets.
Comparison
SPM (4-Pole) vs Standard 2-Pole Monoblock Pumps
See how the MSPM series performs against standard 2-pole monoblock pumps in high-head, low-noise applications.
| Parameter | Standard 2-Pole Monoblock Pump (2900 RPM) | MSPM Monoblock Pump (Rinku Engineers) |
|---|---|---|
| Operating Speed | 2900 RPM | 1450 RPM (4-pole) |
| Max Head (Single-Stage) | 30–40 m | 70 m |
| Max Head (Multi-Stage) | 90–100 m | Up to 150 m (4-stage) |
| Noise Level | 70–78 dB(A) | 60–65 dB(A) |
| Bearing Life (L10) | ~20,000–25,000 hours | 50,000+ hours |
| NPSH Requirement | Higher — cavitation prone | Lower — cavitation resistant |
| Power Range | 0.5–10 HP | 1–15 HP |
| Hot Water Capability | Up to 60°C | 90°C standard / 120°C HT variant |
| High-Rise Suitability | Limited to 5–6 floors | Up to 15+ floors |
| Maintenance Interval | 4–6 months | 12–18 months |
| Warranty | 6 months–1 year | 1 year (2 years with AMC) |
Customer Stories
Trusted by Builders, Hospitals & Industries
Hear from facility managers, builders, and plant engineers using Rinku Engineers’ monoblock SPM pumps for high-head, low-noise applications.
Download the Complete SPM Catalogue
Get the full technical datasheet with stage selection chart, performance curves, dimensional drawings, head calculations, and pricing — direct to your inbox.
FAQs
Frequently Asked Questions
Everything you need to know about monoblock SPM pumps — selection, applications, performance, ordering, and after-sales support.
A monoblock SPM pump is a close-coupled centrifugal pump running on a 4-pole 1450 RPM motor instead of a standard 2-pole 2900 RPM motor. The slower speed provides higher head with lower NPSH requirement, less cavitation, lower noise, and 2–3x longer bearing life.
Rinku Engineers is a leading monoblock SPM pump manufacturer in India with 25+ years of experience, ISO 9001:2015 certification, and exports to 30+ countries. MSPM pumps are available in 1, 2, 3, and 4-stage configurations.
Monoblock SPM pumps range from ₹22,000 for 1 HP single-stage units to ₹75,000 for 15 HP multi-stage variants. Contact the sales team for a configuration-specific quotation.
A monoblock SPM pump works on centrifugal force. The 4-pole motor directly drives the impeller, creating suction at the inlet and accelerating fluid through impeller vanes. In multi-stage designs, this process repeats to build pressure before the volute converts velocity into discharge pressure.
2-pole 2900 RPM pumps deliver high flow at low head for general water transfer. 4-pole 1450 RPM SPM pumps deliver high head at lower flow with lower noise, reduced wear, and longer bearing life. They are preferred for boiler feed, high-rise buildings, RO feed, and pressure boosting.
Rinku Engineers’ monoblock SPM pumps provide up to 70 m head in single-stage configuration. Multi-stage pumps with 2–4 stages can provide up to 150 m head for high-rise buildings and high-pressure industrial applications.
Yes. Standard SPM pumps handle hot water up to 90°C, while high-temperature mechanical seal upgrades allow handling up to 120°C. They are commonly used for boiler feed water in hospitals, hotels, and industrial steam plants.
Monoblock SPM pumps are used in high-rise residential and commercial buildings, boiler feed systems, RO plant high-pressure feed, pressure boosting, hydrostatic testing, industrial washing, cooling tower make-up, and other reliable high-head applications.
Select an SPM pump using four key parameters: required flow rate, total head, fluid temperature, and suction conditions. For high-rise buildings, calculate approximately 3–4 m head per floor plus piping losses. Share these details for a free selection and quotation.
All monoblock SPM pumps come with a standard one-year manufacturer warranty, extendable to two years with an Annual Maintenance Contract. The warranty covers manufacturing defects, bearing failures, and mechanical seal issues under normal conditions.
Standard pumps are dispatched within 3–5 working days. Custom pumps with special voltages, stages, or specifications require 10–20 working days. Export orders take about 4–6 weeks by sea freight or 7–10 days by air freight.
Yes. Rinku Engineers maintains spares including impellers, mechanical seals, bearings, shafts, wear rings, and gaskets. Standard spares are dispatched within 24 hours across India and within 3–5 days for international shipments.
Get In Touch
Request a Free Quote for Monoblock SPM Pumps
Share your head, flow, and temperature requirements. Our pump specialists will respond within four hours with the right stage configuration and a competitive quotation.
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