Shanghai Gengyun Industrial Co., Ltd
The stainless steel tube optical unit is a “stainless steel tube” or “steel pipe” with built-in optical fibers and water blocking materials. Which belonging to the “metal loose tube” structure. In order to meet the harsh working conditions of OPGW. The optical fibers inside the steel pipe must have appropriate excess length.
Stainless Steel Tube Technology Parameters
| Usually, the technical requirements for 304 stainless steel strip used in OPGW are shown in Table 3.7.2-2 | ||||||
| Table 3.7.2-2 | ||||||
| Item | Unit | Requirements | ||||
| Yield strength | N/mm² | ≥205 | ||||
| Tensile strength | N/mm² | ≥520 | ||||
| Elongation rate | % | ≥40 | ||||
| Hardness | HV | ≤200 | ||||
| Permissible tolerance for nominal thickness | mm | thickness：0.15～0.3;tolerance：±0.01 | ||||
| Permissible width tolerance | mm | width：according to the diameter of the steel pipe; tolerance±0.1 | ||||
| Allow sickle bending | mm/2m | ≤8 | ||||
| Shear burr height | ≤10%Steel strip thickness | |||||
Specification
| The specifications of commonly used OPGW stainless steel tube light units are shown in the table 3.7.2-3 | |||||||
| Table 3.7.2-3 | |||||||
| Stainless steel tube light unit Nominal diameter( mm ) |
Center tube structure (maximum number of cores) | Layer stranded structure (maximum number of cores) | |||||
| B 1 or B 4 | B1+B4 | B 1 or B 4 | B1+B4 | ||||
| φ2.5/φ2.6 | 12 | / | 24 | 18 | |||
| φ2.7/φ2.8 | 18 | 16 | 30 | 24 | |||
| φ3.0/φ3.1 | 24 | 20 | 36 | 32 | |||
| φ3.2/φ3.3 | 30 | 24 | 48 | 36 | |||
| φ3.4 | 36 | 28 | 48 | 40 | |||
| φ3.5/φ3.6 | 40 | 32 | 48 | 48 | |||
| φ3.7/φ3.8 | 48 | 48 | 48 | 48 | |||
| Note: 1. B1 or B4: Refers to only one type of optical fiber, G, 652 or G.655, inside the steel pipe. 2. B1+B4: Refers to two types of optical fibers, G.652 and G.655, inside the steel pipe. |
|||||||