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South African class NG15
When the Otavi Mining and Railway Company in South West Africa needed additional locomotives in 1931, the SAR ordered three class NG15 Mikados from Henschel in Germany. They were based on the Otavi class Hd and SAR cl...
General
| Property | South African class NG15Remove |
|---|---|
| Built | 1931-1958 |
| Manufacturers | Henschel, Franco-Belge |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 610 mm (Two feet) |
Dimensions and weights
| Property | South African class NG15Remove |
|---|---|
| Length | 16.54 m |
| Wheelbase | 6.17 m |
| Rigid wheelbase | 2.92 m |
| Total wheelbase | 13.59 m |
| Service weight | 37.2 t |
| Adhesive weight | 26.9 t |
| Axle load | 6.9 t |
| Total weight | 68.9 t |
| Water capacity | 13,000 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | South African class NG15Remove |
|---|---|
| Grate area | 1.55 m² |
| Firebox surface | 6.3 m² |
| Tube heating surface | 67.6 m² |
| Evaporative heating surface | 73.9 m² |
| Superheater surface | 17 m² |
| Total heating surface | 90.9 m² |
Power plant
| Property | South African class NG15Remove |
|---|---|
| Driver diameter | 860 mm |
| Boiler pressure | 12 bar |
| Expansion type | simple expansion |
| Cylinders | two, 400 x 451 mm |
Power
| Property | South African class NG15Remove |
|---|---|
| Power source | steam |
| Estimated power | 375 kW (510 PS) |
| Starting effort | 85.6 kN |
Calculated values
| Property | South African class NG15Remove |
|---|---|
| Factor of adhesion | 1 : 3.08 |
| Optimal speed | 27 km/h |
| Power-to-weight ratio | 10.1 kW/t |
| Heating Surface Equivalent | 139.4 m² |
| Cylinder volume/HSE | 1 : 813.12 |
| Adhesive weight/Total | 1 : 1.38 |
| Tractive force/Heating surface | 1 : 19.66 |
| Grate area/Heating surface | 1 : 58.65 |
| Firebox/Tube surface | 1 : 10.73 |
| Total/Superheater | 1 : 4.35 |
