Chemical plant parts,
material first.
In a chemical plant the medium decides the material, and the material decides the route. We machine agitator shafts, pump bodies, flanges, seal seats and housings to the drawing, with the grade, heat treatment and inspection agreed before the first cut.
Parts we machine for chemical plants
- Agitator and pump shaftsstraightness, journals and seal seats
- Pump bodies and castingsblank verified, then machined from one datum
- Bearing housingssplit housings and seal faces
- Flanges and hubsbolt pattern, face flatness and bore
- Gear shaftsteeth and journals referenced together
- Non-standard partsto drawing, or measured from a sample
The medium decides the material
Carbon steel, alloy steel, stainless or cast iron is chosen against the process medium and the pressure class, not against what is on the shelf. The grade on the drawing is verified on receipt; if it is unavailable we propose an equivalent and state the difference before machining.
Agitator shafts: straightness and the seal journal
An agitator shaft is long, slender and loaded at the impeller end. It is rough turned, heat treated, finish turned on a steady rest, and the seal journal is ground last. Runout is checked against the bearing and seal datums, not against the bar centre.
Pump bodies and castings
A pump body is machined from a casting that has been checked for material and soundness. Bores, flange faces and bolt holes are referenced to one datum so the impeller and the seal line up when the pump is assembled. A casting that fails inspection is replaced, not patched.
Flanges and seal seats
Face flatness, bolt pattern and surface finish decide whether a joint holds. We machine the face and the bore in one set-up where the drawing allows, check the bolt holes against the mating flange, and finish seal seats last so handling does not mark them.
What the shop can hold
Work up to 8 m in turning diameter, shafts up to 12 m between centres, gears up to 8 m outside diameter, and single castings or forgings up to 35 t. Heat treatment and inspection stay in the same workshop.
Inspection and certificates
The material certificate, dimensional record and hardness results travel with the part. Ultrasonic testing is added where the drawing asks for it. Reports can be issued in English for export, and a plant template can be followed if it is sent with the enquiry.
One-off replacement parts
Older plant often has no current drawing. Send the worn part or the mating part; we measure the unworn references and issue a drawing for approval before cutting. One piece is enough — there is no pattern charge and no minimum order.
Chemical plant questions
- How do you decide the material?
- From the drawing and the process medium. If the specified grade is unavailable, we propose an equivalent, state the difference and wait for your agreement before machining.
- Can you machine a replacement agitator shaft without a drawing?
- Yes. Send the worn shaft or the impeller end and we measure the unworn references, reconstruct the journals and seal seat, and issue a drawing for approval.
- Do reports come in English?
- Yes. Material certificates, dimensional records and hardness results can be issued in English, and a customer template can be followed if it is sent with the enquiry.
- How long does a replacement take?
- Usually four to eight weeks from the approved drawing, depending on size, material and heat treatment. The date is confirmed with the quotation.
Send the drawing, or the part that failed.
Tell us the medium, the equipment and the part. We reply with what we can measure, the material questions we still need answered, and a date.
Send a drawing or a photo