Rotating parts: impellers, casings, rotors and shafts
Impellers up to Ø 4,000 mm (157 in), casings, rotors, shafts up to 3,250 mm (128 in) and fan components, made in Tallinn from 10 kg to 5,000 kg (11,000 lb). Parts are turned up to Ø 2,700 mm (106 in), and larger impellers are finish-machined on the FERMAT WRF 130 boring mill. Welded parts are stress-relieved, and rotating parts are dynamically balanced up to Ø 4,000 mm and 4,000 kg (8,800 lb), in carbon steel, stainless, duplex, super duplex and titanium, inspected by VT, PT, MT and RT.
First In Service makes impellers up to Ø 4,000 mm (157 in), turns rotating parts up to Ø 2,700 mm (106 in) and 4,500 mm (177 in) high, and turns shafts up to 3,250 mm (128 in) long, holding tolerances to ±0.02 mm (±0.0008 in) in stainless steel, duplex, super duplex, Inconel, Hastelloy and titanium. Vertical turning reaches Ø 2,700 mm (106 in) on the SC27 lathe; the FERMAT WRF 130 floor-type boring mill (X 13,500 mm) finish-machines larger impellers and housings. Welded parts are stress-relieved, and rotating parts are dynamically balanced up to Ø 4,000 mm (157 in) and 4,000 kg (8,800 lb). Welded structures up to 35 × 7 × 7 metres (115 × 23 × 23 ft) and 160 tonnes (353,000 lb) are fabricated in the same facility, so welding and machining stay under one roof.
Rotating parts we machine.
The list is not exhaustive. If the part is round, heavy and tightly toleranced, send the drawing.
From the workshop: Rotating parts & shafts
Click a photo to enlarge.
On rotating parts, the tolerance is the product.
Rotating equipment fails expensively. A pump casing machined a hundredth out of true, a shaft whose residual stress is released after the final pass, an impeller in the wrong alloy for the service fluid: each can cause an unplanned outage costing days of lost production, far more than the price of the part. What a buyer of rotating parts is really paying for is dimensional certainty, verified material and a supplier who understands why the tolerance is written where it is.
Impellers up to Ø 4,000 mm, stress-relieved and balanced.
Impellers up to Ø 4,000 mm (157 in) are made in one order: welding to EN ISO 3834-2, stress relieving, finish machining and dynamic balancing. An impeller of that size rarely needs a full turning operation. The hub, bore and mating faces are finish-machined on the FERMAT WRF 130 floor-type boring mill or another machine in the park, and parts up to Ø 2,700 mm (106 in) can be turned on the SC27 vertical lathe.
Stress relieving (post-weld heat treatment, PWHT) is a routine step in our process, not an option on request. Relieving welding stresses before final machining reduces the risk of the part distorting after the last cut. Grinding and polishing are done by certified partners within the same order, so you still deal with one supplier.
Shafts up to 3,250 mm long.
Shafts up to 3,250 mm (128 in) long and Ø 1,000 mm (39 in) are turned on the PUMA 700LY II horizontal turning centre, where live tooling adds milled features in the same setup. Hubs, flanges and rings up to Ø 2,700 mm (106 in) are turned on the SC27 vertical lathe.
A 3-metre shaft or a 40-tonne housing gets a setup plan before it gets a spindle: how it is supported so its own weight does not distort the datum, in what order features are cut so residual stresses release early rather than after the final pass, and where in the sequence dimensional checks catch drift while there is still material to correct it.
Dynamic balancing up to Ø 4,000 mm and 4,000 kg.
Impellers, rotors and fan components up to Ø 4,000 mm (157 in) and 4,000 kg (8,800 lb) are dynamically balanced as part of the same order, so one supplier is responsible for both machining and balancing. State the balance grade your drawing or specification requires when you send the enquiry.
Large rotating components, machined and documented in one place.
We machine impellers up to Ø 4,000 mm (157 in), pump and compressor casings, rotor and shaft systems and turbine housings, with turning up to Ø 2,700 mm (106 in) and shafts up to 3,250 mm (128 in) long, holding ±0.02 mm (±0.0008 in) where the fit demands it. Fabrication, machining, surface treatment and assembly happen in one 18,000 m² (194,000 sq ft) Tallinn facility, so a welded-and-machined assembly stays under one roof from plate to FAT.
Typical scope
Relevant equipment
Materials
What this work runs on.
Heavy fabrication
Up to 35 × 7 × 7 m (115 × 23 × 23 ft) and 160 tonnes (353,000 lb). EN ISO 3834-2, EN 1090-2.
Heavy fabrication →Specifications at a glance
| Rotating parts | Impellers up to Ø 4,000 mm (157 in), rotors, fan and blower components |
|---|---|
| Impellers | Up to Ø 4,000 mm (157 in); turned to Ø 2,700 mm (106 in), larger sizes finish-machined on the FERMAT WRF 130 |
| Stress relieving | Post-weld heat treatment (PWHT), routine for welded parts |
| Grinding and polishing | By certified partners, within the same order |
| Shafts | Up to 3,250 mm (128 in) long and Ø 1,000 mm (39 in), turned with live tooling |
| Casings and housings | Pump, compressor, turbine and bearing housings |
| Component weight | 10 kg to 5,000 kg (11,000 lb) |
| Balancing | Dynamic, up to Ø 4,000 mm (157 in) and 4,000 kg (8,800 lb) |
| FERMAT WRF 130 | Floor-type boring mill, X 13,500 mm (531 in) — housings and frames |
| SC27 VTL | Vertical turning to Ø 2,700 mm (106 in) — rings, flanges, hubs |
| PUMA 700LY II | Horizontal turning, live tooling, L 3,250 mm (128 in) |
| ZAYER XIOS 4000 | Bed-type CNC milling, X 4,000 mm (157 in) |
| Corrosion-resistant | Duplex, super duplex, stainless |
| Speciality alloys | Inconel, Hastelloy, titanium |
| Traceability | EN 10204 3.1 standard, 3.2 on request |
Questions buyers of rotating parts ask
Can First In Service machine large impellers and pump casings?
Yes. Impellers up to Ø 4,000 mm (157 in) and pump casings are machined to tolerances down to ±0.02 mm (±0.0008 in) in stainless steel, duplex, super duplex, Inconel and titanium. Parts up to Ø 2,700 mm (106 in) are turned on the SC27 vertical lathe; larger impellers, which rarely need a full turning operation, are finish-machined on the FERMAT WRF 130 boring mill.
What size shafts can you machine?
Shafts up to 3,250 mm (128 in) long and Ø 1,000 mm (39 in), turned on the PUMA 700LY II horizontal turning centre with live tooling for milled features in the same setup.
Do you manufacture components for hydropower and turbines?
Turbine housings, rotor and shaft systems and casings are within our 160-tonne (353,000 lb), 35-metre envelope, with full material traceability.
What documentation ships with rotating parts?
Dimensional inspection reports, EN 10204 3.1 material certificates (3.2 on request), and NDT reports (VT, PT, MT, UT) performed by certified partners.
Do you balance rotating parts?
Yes. Rotating parts up to Ø 4,000 mm (157 in) and 4,000 kg (8,800 lb) are dynamically balanced. State the balance grade your drawing or specification requires when you send the enquiry.
Are welded impellers stress-relieved?
Yes. Stress relieving (post-weld heat treatment) is a routine step in our process for welded impellers and fabrications. It is done before final machining, so the part does not distort after the last cut.
Do you grind and polish impellers?
Grinding and polishing are done by certified partners within the same order. First In Service remains your single supplier and point of contact.
What balance grade should I specify?
Use the grade on your drawing or in the equipment specification. If none is given, ISO 21940-11 lists guidance grades by machine type, such as G6.3 for fans and pumps, and ISO 14694 sets the grades for industrial fans. Our buyer's guide shows how to turn a grade into a permissible residual unbalance.
Buyer’s guides
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