Boulton pumps – Boulton IL vertical in-line pump, monobloc design
The Boulton IL pump is a vertical centrifugal pump of the monoblock design, with the suction and discharge ports in line. Manufacturer: Boulton Pumps, Polígono Industrial de Santelices 7, 48550 Muskis, Biscay, Spain. The company was founded in 1997 and manufactures pumps at its own production facility in Muskis.
The series complies with the EN 733 standard. Flow rate — up to 200 m³/h, head — up to 100 m, nominal diameters (DN) from 40 to 150. Fluid temperature: from −10 to +140 °C. Casing pressure: 10 bar, with a 16 bar version available. Speed: up to 2,900 rpm.
Boulton IL pump: technical specifications
| Parameter | Value |
|---|---|
| Type | vertical centrifugal, monobloc, in-line |
| Standard | EN 733 |
| Flow rate, max. | 200 m³/h |
| Pressure, max. | 100 m |
| Standard sizes | DN 40–150 |
| Medium temperature | from −10 to +140 °C |
| Casing pressure | 10 bar, 16 bar version |
| Rotational speed | up to 2,900 rpm |
| Frequency 50 Hz | 1,450 or 2,900 rpm |
| Frequency: 60 Hz | 1,750 or 3,500 rpm |
| Engine power | from 0.37 to 90 kW |
| Engine dimensions | from 71M to 280M |
| Connection to the motor | rigid, in accordance with EN 733 |
| Flanges | DIN 2632 / PN 10 or DIN 2633 / PN 16 |
| Shaft seal | face-type mechanical |
A water head of 100 metres corresponds to approximately 9.8 bar, which is consistent with a casing pressure of 10 bar. The manufacturer produces models with higher flow rates and pressures on request.
What are the benefits of inline layout?
The suction and discharge pipes are aligned on the same axis, at the same level and have the same diameter. The pump is fitted directly into a horizontal pipe, like a piece of pipework.
First consequence: no foundation is required, nor is a separate site. The pump is supported by the pipework itself and the pipe supports.
Second advantage: there is no need to reroute the pipes. With a standard side-suction, top-discharge pump, the pipework has to be laid at two different levels. Here, it runs in a straight line.
Consequence three: a smaller footprint. This is the main reason why such pumps are used in boiler rooms, supply ventilation units and pumping stations in basements — places where space is at a premium.
The monoblock design means that the impeller is mounted directly onto the motor shaft. There is no intermediate shaft, coupling or support frame. This reduces the length of the unit and eliminates the need for alignment during installation.
The motor connection is rigid, in accordance with EN 733. Standard flanged induction motors are fitted, with frame sizes ranging from 71M to 280M and power ratings from 0.37 to 90 kW.
Thirty-two sizes ranging from 40–125 to 200–400
There are 32 sizes in the series. The designation is read as the diameter of the discharge pipe and the nominal diameter of the impeller.
| DN | Standard sizes |
|---|---|
| 40 | 40-125, 40-160, 40-200 |
| 50 | 50-125, 50-160, 50-200, 50-250 |
| 65 | 65-125, 65-160, 65-200, 65-250, 65-315 |
| 80 | 80-125, 80-160, 80-200, 80-250, 80-315 |
| 100 | 100-160, 100-200, 100-250, 100-315, 100-400 |
| 125 | 125-200, 125-250, 125-315, 125-400, 125-450 |
| 150 | 150-250, 150-315, 150-400 |
| 200 | 200-315, 200-400 |
Each size is available in two speed variants — 1,500 and 3,000 rpm (rated). The fine-pitch range allows the operating point to be selected without a significant margin, and therefore without wasting electricity.
Housing materials and flanges
The manufacturer produces casings from cast iron, steel, bronze, stainless steel, Hastelloy or any other metal alloy to order.
This offers a wider range of options than a standard in-line heating pump, where the choice is usually limited to cast iron. The availability of bronze, stainless steel and Hastelloy means that the series can be used with seawater, recirculating water containing chlorides and other media where cast iron is unsuitable.
Flanges are manufactured in accordance with DIN 2632 for PN 10 or DIN 2633 for PN 16. The flange class is selected to suit the system pressure and is matched to the body design.
For which media is the Boulton IL pump designed?
The manufacturer specifies that the series is intended for general water supply applications in air conditioning, industry, irrigation and other services, for clean or slightly contaminated liquids.
In practical terms, these include heating and cooling systems, air-conditioning circuits, feed and circulation systems in industrial processes, irrigation, industrial water supply, and pressure boosting in internal networks.
The temperature range from −10 to +140 °C covers both coolants and hot water in heating systems.
This series is not intended for media containing solid particles or for chemically aggressive processes — Boulton offers separate models for these applications.
Boulton IL, amongst the manufacturer’s other ranges
| The series | Type and standard |
|---|---|
| IL | vertical in-line pump, EN 733 |
| ESN / ESH | horizontal centrifugal pump in accordance with DIN 24255 (EN 733) |
| ESM | centrifugal, in a monoblock design |
| ESK | centrifugal in accordance with ISO 5199 (2858) and ASME B73.1 |
The difference between the IL and ESM in terms of layout: both are monoblock units, but the IL is integrated vertically into the line, whilst the ESM is mounted horizontally on a support. The difference between the IL and ESK is fundamental: the ESK is manufactured to the ISO 5199 and ASME B73.1 process standards and is designed for more demanding chemical applications.
A complete list of the manufacturer’s eight series, as well as information about the company and standards, can be found at the Boulton Pumps page.
How to choose a Boulton IL pump at Steiner Ukraine
Six pieces of information are required for selection: flow rate in m³/h, required head in metres, the name or composition of the fluid, its temperature, the system pressure, and the diameter of the pipe into which the pump is to be installed.
Two parameters are specified separately. The first is the body material, depending on the medium: cast iron, steel, bronze, stainless steel or Hastelloy. The second is the flange class: PN 10 or PN 16.
If the medium contains solid particles or is chemically aggressive, other Boulton series may be more suitable — please let us know straight away.
Steiner Ukraine supplies Boulton equipment, including design, configuration, commissioning and spare parts. The scope is described in the section services. Industrial pumps — in the section industrial pumps, centrifugal — in the section centrifugal pumps. Sector-specific recruitment — in sector-specific solutions. The technical specifications of the original source are published at the Boulton Pumps website.
Frequently Asked Questions
What is an in-line pump?
A pump in which the suction and discharge connections are aligned on the same axis. It is fitted directly into horizontal pipework and does not require a foundation.
What is the maximum flow rate of the Boulton IL pump?
200 m³/h at a head of up to 100 m. The manufacturer produces models with higher specifications on request.
How many sizes are there in the range?
Thirty-two, ranging from 40–125 to 200–400, with nominal diameters (DN) from 40 to 150.
What is the permissible ambient temperature?
From −10 to +140 °C. This covers both coolants and hot water in heating systems.
What pressure is the casing designed for?
10 bar as standard, 16 bar as an option. Flanges in accordance with DIN 2632 / PN 10 or DIN 2633 / PN 16.
What materials are available for the casing?
Cast iron, steel, bronze, stainless steel, Hastelloy or any other metal alloy to order.
What type of motor is fitted to the pump?
Standard asynchronous motor in a flanged design, with a rigid coupling in accordance with EN 733. Sizes ranging from 71M to 280M, power ratings from 0.37 to 90 kW.
Is IL suitable for chemically aggressive environments?
The manufacturer specifies a series for clean or slightly contaminated liquids. For process chemical applications, Boulton offers the ESK series in accordance with ISO 5199 and ASME B73.1.
How much does a Boulton IL pump cost?
The price depends on the size, body material, flange class and motor power. Models made from stainless steel or Hastelloy are significantly more expensive than those made from cast iron. Please send us the flow rate, pressure, medium and temperature — and we will prepare a quotation.
