When it is needed
- A fan audit shows the rotor is the loss, not the system
- A forward curved or straight radial wheel is doing a clean air duty where a backward curved or aerofoil wheel would do it on less power
- The duty has changed and the fan is now oversized or undersized for it
- The impeller is worn, cracked or repaired beyond balancing, and a like-for-like replacement would repeat the problem
- The plant wants more flow or pressure from the same fan without civil work
What we do
- Measure the existing fan and record the casing geometry, inlet, shaft and bearing arrangement
- Design a replacement impeller for the present duty, matched to the existing casing and cut-off
- Manufacture the rotor in the material the gas needs, balance it static and dynamic to grade G 6.3 or G 2.5 as per ISO 21940-11
- Fit at site, often inside a planned shutdown, with inlet cone and shaft seal changes where the new wheel needs them
- Test after fitting and hand over the measured operating point
What you get
- A fan that does the present duty at lower power, with a before and after test report
- A rotor built for the gas, not a catalogue part
- No change to the foundation, the duct or in most cases the motor
A retrofit is only as good as the measurement before it. We do not change a rotor on a nameplate figure.