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Drum Band Sizing Calculator
Enter the outside diameter you measured across the drum body. The calculator returns the circumference and the gap a band of the length you specify will leave for the closure springs to bridge.
Your Drum
Enter a diameter and press Calculate.
Reference Diameters
Outside diameters published by BASCO for the common 200 L (55 gallon) formats. Use them to sanity-check your own measurement.
| Drum format | Outside diameter | Circumference | Gap left by a 1740 mm band |
|---|---|---|---|
| Steel, open-head | 24-1/2 in (622 mm) | 1,954 mm | 214 mm (8.4 in) |
| Plastic (HDPE), tight-head | 23-1/4 in (591 mm) | 1,857 mm | 117 mm (4.6 in) |
| Steel, tight-head | 23 in (584 mm) | 1,835 mm | 95 mm (3.7 in) |
| Plastic (HDPE), open-head | 22-7/8 in (581 mm) | 1,825 mm | 85 mm (3.4 in) |
How to Measure
Measure across the drum body, not across the rolling hoops or the top rim. Wrap a tape around the body and divide by 3.1416 if a caliper is not to hand — that reading is the circumference the band has to cover.
What the Result Means
A gap under about 100 mm sits comfortably inside the travel of two extension springs. Above roughly 200 mm the band is being asked to close a distance that puts the tension into the jacket edge rather than around the drum, which is where a longer band belongs instead.
Send the number this calculator gives you with your enquiry and the band length is priced into the first quote. Full specifications are on the silicone drum heaters page.
Send Your Measurement for a QuoteModel assumption: circumference = π × outside diameter, rounded to one decimal place. Gap = circumference − band length. Inputs are scoped to drums and pails, so a diameter above 5,000 mm or a band above 20,000 mm returns no result. The calculator does not model spring travel, jacket thickness or drum out-of-round.
