A diesel generator set is heavy rotating equipment. Before a factory approves a quotation, the purchaser and site engineer should check the base frame, floor loading, anti-vibration arrangement, exhaust support, and service space. These points are easy to miss when the discussion focuses only on kW or kVA.
In practice
The generator supplier can provide outline drawings and base frame information, while the local civil engineer should confirm the floor or foundation. The RFQ should state whether the set will sit on a ground slab, raised floor, steel skid, trailer, or existing plant room foundation.
Installation points that affect the package
| Point | What to confirm | Possible issue if missed |
|---|---|---|
| Base frame | Overall size, lifting points, mounting holes | Wrong foundation or lifting plan |
| Floor loading | Static load and service access | Cracking or unsafe placement |
| Vibration | Pads, isolators, flexible joints | Noise and pipe stress |
| Exhaust | Pipe support by site, not engine manifold | Manifold damage or leakage |
| Access | Doors, filters, battery, oil drain | Difficult maintenance after installation |
What the purchaser should provide
- Generator room layout, door width, route to final position, and lifting limits.
- Floor or foundation type and any restriction on anchor bolts.
- Required vibration isolation method if the site has a special standard.
- Exhaust pipe route, silencer location, and who supports the pipework.
- Fuel tank location, oil drain access, and maintenance side clearance.
- Whether the set is open, silent, containerized, skid-mounted, or trailer-mounted.
Common site mistakes
- Approving a generator without checking whether it can pass through the plant room door.
- Letting the engine exhaust manifold carry the weight of the full exhaust pipe.
- Forgetting battery, radiator, filter, and oil drain access after the set is installed.
- Using a thin floor slab without civil review for a high-capacity set.
- Treating vibration isolation as a general accessory instead of a site-specific requirement.
Documents to request
Request the generator outline drawing, base frame drawing, lifting points, approximate operating weight, maintenance clearance notes, exhaust outlet position, fuel connection notes, and factory test record. The local engineer should use those documents for foundation and installation approval.
Useful internal references
- 500 kW 630 kVA Cummins generator configuration
- Generator room ventilation RFQ checks
- Diesel generator exhaust system checks
Common questions
Does every generator need a concrete foundation?
Not always. The foundation depends on set size, site structure, vibration limits, and installation type.
Are anti-vibration pads enough for all sites?
No. Pads may be suitable for some installations, but sensitive buildings may require a local vibration review.
Who designs the floor slab?
The local civil engineer should approve the slab or foundation using supplier drawings and equipment weight data.
Should exhaust pipe support be included?
The RFQ should state whether site pipe supports, flexible joints, and silencer supports are by the buyer or supplier.
Why does maintenance clearance matter?
Restricted clearance can make filter replacement, oil draining, radiator cleaning, and battery service difficult.
Before requesting a quotation
A factory generator quotation is stronger when the base frame and installation assumptions are clear. Confirm floor loading, lifting route, vibration isolation, exhaust support, and maintenance access before order approval.