Explanation of cost-performance for cable trays made of different materials
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Cost-performance analysis of cable trays made from different materials (1000×200 L=6000)I. Steel cable trays with hot-dip galvanizing:
1. ① Weight of the steel structure: 260×2×0.003×7.8 = 12.168 kg/m
② Weight of the supporting components: (40 + 20×2 + 10×2)×0.003×5×1×7.8 = 11.7 kg/m
③ Weight of the cover: 1060×0.003×7.8 = 24.80 kg/m
④ Weight of the connecting plates: 200×4×0.2×0.003×7.8/6 = 0.622 kg/m
Total weight: 49.29 kg/m
2. Unit price (in yuan per ton):
1) Steel sheet (cold-rolled): 5300 yuan/T
2) Waste from cutting: 10% → 5300 yuan/T × 10% = 530 yuan/T
3) Labor costs for manufacturing: 500 yuan/T
4) Costs related to water and electricity: 200 yuan/T
5) Costs of consumables: 150 yuan/T
6) Equipment depreciation: 100 yuan/T
7) Depreciation of fixed assets: 100 yuan/T
8) Cost of hot-dip galvanizing: 5000 yuan/T
9) Transportation costs (for raw materials and finished products): 200 yuan/T
10) Administrative costs: 500 yuan/T
11) Taxes: 500 yuan/T
12) Profit: 1000 yuan/T
Total: 14080 yuan/T
3. Total price per meter: 49.29 kg/m × 14.080 yuan/kg = 694.00 yuan/m
4. Cost of connecting bolts: 0.8×24/6 = 3.2 yuan/m
5. Total cost per meter: 694 + 3.2 = 697.2 yuan/m
II. Fiberglass cable trays: (1000×200 L=6000)
1. Cost of fiberglass cable trays: 520 yuan/m. Due to their lower strength, two 12# channel steels are required as supports.
2. Cost of 12# support channels:
1) Weight: 12 kg/m × 2 (two channel steels) = 24 kg/m
2) Unit prices:
① Channel steel: 3200 yuan/T
② Transportation costs: 200 yuan/T
③ Cost of hot-dip galvanizing: 4000 yuan/T
④ Processing costs: 200 yuan/T
⑤ Installation costs: 500 yuan/T
⑥ Depreciation of fixed assets: 100 yuan/T
⑦ Administrative costs: 300 yuan/T
⑧ Costs related to water and electricity: 100 yuan/T
⑨ Costs of consumables: 100 yuan/T
⑩ Taxes: 300 yuan/T
Profit: 500 yuan/T
Total: 9500 yuan/T
3. Total price per meter: 24 kg/m × 9.5 yuan/kg = 228 yuan/m
4. Overall unit price: 520 + 228 = 748 yuan/m
III. Composite epoxy resin cable trays: (1000×200 L=6000)
Total price: around 800 yuan/m
IV. Cost-performance analysis:
1. Prices: Comparing the prices of cable trays made from these three different materials, there is a difference of several dozen yuan per meter. For a total length of 2000 meters of cable trays, the total investment difference will not exceed 100,000 yuan. 2. Performance: Utilized in this engineering environment with the above three materials. 1) The service life of metal cable trays does not exceed 5 years, and efforts and resources must be invested each year in carrying out anti-corrosion treatment. 2) The service life of fiberglass cable trays does not exceed 8 years, and annual efforts and resources are also required to carry out anti-corrosion treatment on the channel steel supports. Due to the poor aging resistance of fiberglass, it is difficult to perform any repairs after 3 years of use. Such as: inspecting cables, replacing cables, etc. 3) The composite epoxy resin cable trays have a service life of over 15 years, and they are maintenance-free products that require no maintenance during use. 3. Although the price of composite epoxy resin cable trays is a bit higher, the total investment in cable trays for this project will not exceed 100,000 yuan. But its performance is extremely excellent, and its service life is 3-4 times that of ordinary materials. It not only solves the problem of having to invest manpower and resources annually for anti-corrosion measures during use, but also addresses the long-standing difficulty associated with the hardiness of cable trays to be replaced. It increases the service life of the cables and the reliability of the system operation. Composite epoxy resin cable trays have a very attractive appearance, do not fade, and help to beautify the environment. When considering various factors such as price and performance, using a composite epoxy resin composite is the most suitable choice for this project. This product is widely used across industries such as chemicals, petroleum, and petrochemicals nationwide, and it receives very high evaluations. I hope the leaders will take this into consideration; please let me know if there are any issues. This post was last edited by 771207 on 2008-3-3 at 20:29.]