While service intervals are long, when something breaks, parts are expensive. A set of main bearings can cost $3,000–$5,000, and an OEM rotor replacement is nearly the cost of a new unit. Additionally, servicing requires specialized tooling and Howden-trained technicians—local general mechanics cannot handle it.
The cast-iron casing makes these compressors significantly heavier than rotary vane or scroll alternatives. For mobile or space-constrained installations (e.g., offshore platforms), this is a real issue.
The Howden screw compressor is the “Mercedes G-Wagon” of rotary screws: over-engineered, expensive to buy and fix, but nearly unstoppable when properly maintained. It’s not for everyone, but for critical process applications, it’s a justifiable investment.