Metal Valve Chamber
Chemical composition
Scroll to the right (Unit : %)| Material (by conventional number) | Quality standards | Test Method | ||||
|---|---|---|---|---|---|---|
| SS275 (SS400) |
P | S | C | Si | Mn | KS D 3503 |
| 0.050 or less | 0.050 or less | 0.25 or less | 0.45 or less | 1.40 or less | ||
Mechanical properties
Scroll to the right| Material | Test criteria | Quality standard | Unit | Test method | ||
|---|---|---|---|---|---|---|
| SS275(SS400) | Yield point or yield strength | 275 or more | N/㎟ | KS D 3503 | ||
| Tensile strength | 410 ~ 550 | N/㎟ | ||||
| Elongation rate | 18 or more | % | ||||
| Bendability | Bending angle | 180° | - | |||
| inner radius | 1.5 times of thickness | - | ||||
Manhole cover and base
Chemical composition
Scroll to the right| Material | Quality standards | Unit | Test Method | ||
|---|---|---|---|---|---|
| GCD500 (Specimen separately placed) |
C | S | Mg | % | SPS - KFCA - D4302 - 5016 |
| 2.5 or more | 0.02 or less | 0.09 or less | |||
Mechanical properties
Scroll to the right| Material | Test criteria | Quality standard | Unit | Test method | ||
|---|---|---|---|---|---|---|
| GCD500 (Specimen separately placed) |
Tensile strength | 500 or more | N/㎟ | SPS - KFCA - D4302 - 5016 | ||
| Yield strength (Applies upon request) |
320 or more | N/㎟ | ||||
| Elongation | 7 or more | % | ||||
Load Test
Scroll to the right| Material | Test criteria | Load Test (kN) | Quality Standard | Test Method | ||
|---|---|---|---|---|---|---|
| GCD450 (circular) |
Static load test | Vehicle roads | 450 | It should withstand the specified load and there should be no residual deformation when the load is removed. | SPS - KFCA - M201 - 1639 | |
| Reversible land (side ditch) | 450 | |||||
| Pedestrian roads | 200 | |||||
Rubber packing
Physical properties
Scroll to the right| Material | Test Method | Quality standard | Unit | Test Method | |
|---|---|---|---|---|---|
| Secondary class | Spring hardness | 70±5 | Hs | KS M 6613 | |
| Tensile strength | Elongation rate under load of 686N/㎠ | 200 or less | % | ||
| Tensile strength | 1570 or less | N/㎠ | |||
| Elongation rate | 300 or more | % | |||
| Permanent elongation rate | 10 or less | % | |||
| Aging test | Changes in tensile strength | within -20 | % | ||
| Changes in elongation rates | between +10 and -30 | % | |||
| Changes in spring hardness | +7 ~ 0 | Hs | |||
| Compression rates | 30 or less | % | |||
Dissolution test
Scroll to the right| Test criteria | Quality standard | Unit | Test method |
|---|---|---|---|
| Free sulfur analysis test | 0.5 or less | wt % | KS M 6613 |
| Turbidity | 0.5 or less | NTU | |
| Chromaticity | 5 or less | degree (°) | |
| Consumption amount of potassium permanganate | 5 or less | mg/L | |
| Reduction of residual chlorine | 0.7 or less | mg/L | |
| Odor and taste | No abnormality | - |