Boulton pumps
Boulton Pumps — Spanish manufacturer of centrifugal pumps with its own production plant in Muskiz (Bizkaia). The company traces its origins back to 1997, when a group of pump design and manufacturing specialists established a production centre in Muskiz. The manufacturer boasts over 20 years of accumulated experience. The catalogue covers eight series and flow rates from 4 to 10,000 m³/h.
Steiner Engineering & Consulting supplies Boulton Pumps equipment to Ukraine: selection according to the medium, customisation, documentation, and spare parts.
Who are Boulton Pumps?
Boulton Pumps Industries is a manufacturer of centrifugal pumps. Production address: Polígono Industrial de Santelices 7, 48550 Muskiz (Bizkaia), Spain. Manufacturer's telephone: +34 946 510 116.
The company positions itself as centrifugal pump specialists. The stated mission is to design and manufacture pumps with energy efficiency and high durability. The pumps are manufactured in Muskiz, from where exports are dispatched. The manufacturer's website operates in six languages: Spanish, English, French, Portuguese, German, and Polish.
| Parameter | Value |
|---|---|
| Country of manufacture | Spain (Muskiz, Biscay) |
| Start of operations | 1997 |
| Number of pump series | 8 |
| Feed range (as stated by the manufacturer) | 4–10,000 m³/h |
| Maximum head in the catalogue | 550 m (MS series) |
| Maximum temperature in the catalogue | +350 °C (FTP series) |
| Maximum pressure as stated in the catalogue | 30 (63) bar (MS series) |
| Maximum DN | 600 (SCP series) |
| Explosion protection | ATEX option for all series |
Which pump series does Boulton Pumps manufacture?
Catalogue Boulton Pumps It consists of eight series. These are divided into five design groups: spiral casing, vertical, split casing, high-pressure and self-priming.
| The series | Type / standard | DN | Flow rate, m³/h | Head, m | Temperature, °C | Max pressure, bar | Revolutions per minute (rpm) |
|---|---|---|---|---|---|---|---|
| ESN / ESH | DIN 24255 (EN 733), on the frame | 32–250 | up to 1750 | 105 | −10…+140 | 10 (16) | up to 3,600 |
| ESM | DIN 24255 (EN 733), monobloc | 32–150 | up to 1750 | 105 | −10…+140 | 10 (16) | up to 3,600 |
| ESK / PK | ISO 2858, process-based | 32–250 | up to 1700 | 160 | -10…+175 | 16 (25) | up to 3,600 |
| FTP | thermal oil, DIN 2632 PN 10 / DIN 2633 PN 16 flanges | 32–125 | up to 350 | 105 | up to +350 | 10 (16) | up to 3,600 |
| IL | vertical monoblock, in-line input and output | 40–150 | up to 200 | 100 | −10…+140 | 10 (16) | up to 2,900 |
| SCP | split case, double suction | 65–600 | up to 6,000 | 180 | -10…+110 | 16–25 | up to 3,600 |
| MS | multistage high-pressure, flanges DIN 2633 PN 16 / PN 40 (63) | 32–250 | up to 1000 | 550 | −10…+140 | 30 (63) | up to 3,600 |
| SPM | self-annealing, ductile cast iron | Rg 1½″–4″ (DN 42–100) | up to 140 | see note | up to +80 | not specified | up to 3,600 |
Four series are already presented as separate cards: ESN / ESH, ESM, ESK / PK, IL. For FTP, SCP, MS and SPM, please send an enquiry — we will select the size to suit your operating points.
What does the EN 733 (DIN 24255) standard mean?
EN 733 (formerly DIN 24255) specifies overall and connection dimensions single-stage centrifugal pumps with a nominal pressure of 10 bar. The standard establishes the shaft axis height, flange dimensions, distance between supports, and type designations.
The practical consequence is singular: a pump from any manufacturer complying with EN 733 becomes a direct replacement for another of the same frame size. The foundation, pipework and coupling remain unchanged. That is precisely why the ESN / ESH and ESM series are designated by frame sizes such as 32-125 or 200-400: the first number is the discharge DN, the second is the nominal impeller diameter.
EN 733 describes neither materials, nor hydraulics, nor allowable nozzle loads. It is a standard of interchangeability, not a process pump standard.
What is the difference between ISO 2858 and EN 733?
ISO 2858 also specifies dimensions, but for pumps chemical and technological industryThe nominal pressure in this standard is higher and the design requirements are stricter. The ESK / PK series is built to ISO 2858.
The difference is visible in the figures of the Boulton Pumps catalogue itself.
| Parameter | ESN / ESH, ESM (EN 733) | ESK / PK (ISO 2858) |
|---|---|---|
| Maximum temperature | +140 °C | +175 °C |
| Maximum pressure | 10 (16) bar | 16 (25) bar |
| Maximum head | 105 metres | 160 m |
| Impeller | enclosed, open, vortex, duct | closed |
| Target sectors | clean and lightly polluted environments | chemistry and process manufacturing |
Rule of thumb: EN 733 is used for water, irrigation and general water supply. ISO 2858 is used for aggressive and hot media.
⚠️ There is a discrepancy in the manufacturer's sources. The description of the ESK series on its own page calls ISO 2858 onlyThe series catalogue list and the meta description of the same page are called ISO 5199 (2858) and ASME 73.1We are publishing ISO 2858 as confirmed. Compliance with ISO 5199 and ASME B73.1 requires written confirmation from the manufacturer before use in tender documentation.
What materials are Boulton Pumps made from?
The manufacturer claims production "in all materials". The listed range covers both standard cast iron and high-alloy steels.
| Material | Typical application |
|---|---|
| Grey cast iron | water, lightly contaminated environments |
| Ductile (nodular) iron | increased pressures, ESK and SPM series |
| Steel | general industrial applications |
| Bronze | sea water, SCP and MS series |
| AISI 316 / 316L | food and chemical environments, moderate corrosion |
| Duplex | chlorides, increased strength |
| Superduplex | seawater, high chloride concentration |
| Hastelloy | strong acids and oxidising agents |
Material execution can be full or partial. That is, the casing and the impeller are ordered in different alloys when it is economically justified.
Which impellers and mechanical seals are available?
Volute casing series are supplied with four types of impeller. The choice determines what the pump is capable of handling.
| Impeller type | What is it for? |
|---|---|
| Closed | pure liquids, highest efficiency |
| Open | liquids with impurities and fibres |
| Vortex | liquids with large solid particles |
| Channel | contaminated environments and sludges |
The manufacturer claims deep expertise in mechanical seals. Seals are selected according to API piping plans. The plan determines how barrier or flush liquid is supplied to the friction pair. For hot, crystallising or toxic media, it is the API plan that determines the pump's service life, rather than the casing itself.
The SCP series additionally features wear-resistant rings in the casing. Impeller rings are optional. For larger sizes, a double volute is available, which reduces the radial load on the shaft.
Does the Boulton Pumps pump come in an explosion-proof design?
Right. The manufacturer offers an option ATEX certifications for all its pumpsThis applies to all eight series, not individual models.
ATEX is required where the pump is located in an area with a potentially explosive atmosphere. Typical cases: solvents, alcohols, fuels, and organic dust. The equipment category and group are determined by the area classification at your facility. This must be specified in the enquiry along with the duty point.
How to choose a series for your task?
Comparison by limit parameters yields an unambiguous choice in most cases.
| Task | The series |
|---|---|
| Direct pump replacement per EN 733 on baseplate | ESN / ESH |
| The same, but compact, without the frame and coupling | ESM |
| Chemistry, temperature over +140 °C, pressure over 16 bar | ESK / PK |
| Thermal oil up to +350 °C | FTP |
| Little space, installation directly into the pipeline | IL |
| Large volumes of water, fire-fighting, water treatment | SCP |
| Head over 160 m, up to 550 m | MS |
| Self-priming, suspended solids, abrasive | SPM |
For accurate selection, four values are required: the medium, flow rate in m³/h, required head in metres, and temperature. Additionally — viscosity, solids content, and the hazardous area classification.
Frequently asked questions about Boulton Pumps
Where are Boulton Pumps manufactured?
In Muskiz (Bizkaia, Spain), at Polígono Industrial de Santelices 7, 48550. The production centre was established in 1997.
Are Boulton pumps interchangeable with pumps from other manufacturers?
The ESN / ESH and ESM series are manufactured in accordance with DIN 24255 (EN 733). Pumps built to this standard are interchangeable in terms of overall and connection dimensions with pumps of the same frame size from other manufacturers. The ESK series is manufactured in accordance with ISO 2858, which also specifies standardised dimensions.
What is the maximum head in the Boulton Pumps catalogue?
550 m — MS series, multi-stage high-pressure pump. Among single-stage ones, ESK / PK has the highest head: 160 m.
Which series withstands the highest temperature?
FTP — up to +350 °C. This series is designed specifically for thermal oil: powering industrial plants, boilers, drying lines, furnace heating.
Can a pump be ordered in a stainless steel version?
Right. The manufacturer declares AISI 316, AISI 316L, DUPLEX, SUPERDUPLEX and Hastelloy. The execution is either full or partial.
How many episodes are in the catalogue?
Eight: ESN / ESH, ESM, ESK / PK, FTP, IL, SCP, MS, SPM.
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