lin91957
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 Posted: Fri 17:54, 08 Apr 2011 Post subject: ghd piastra Pipeline External Coating development |
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Pipeline External Coating and economic evaluation of the development process
1 =! L = J II and other pieces of content can easily {guaranteed anti-corrosion coating Table 2 Cost comparison of different processing fees total cost of the unit price per square meter of coating materials, the name of material cost per amount of material / m2 yuan / m2 primer:】 7 yuan, kg0.5kg8.50 glass fabric: 120,[link widoczny dla zalogowanych], n125.6m26.72 glass cloth Asphalt Asphalt: 155 yuan / kg80kgi2.42459PVC film: 2.1O per m2】. 35m22.84 station 3046 +30.46 × 5% -35.3 million (loss: I5%) primer: 280, 0.5kgl4. O0 Enamel: 28O million, kg36kglO】 O within the seam with coal tar enamel: 1.80 yuan, m21.15m22. 【】 O2465 outer wrapping: 10.00 yuan / m21.15m21l5O Total: 3760 +37.60 × l0% = Il1.36 million (loss: 10%) epoxy dry Chau Ching: 17 () o yuan / kg1. 5kg25 orange glass epoxy coal Lek Holland: 1.20 yuan / m228m23.362659 United juice t: 28.86 ~ 2886 × 15% = 33.19 million (loss: 15%) primer: l redundancy,[link widoczny dla zalogowanych],, kg05kg85 [I the wrapping: 2 Wu trifles dry with a kglkg2500 polyethylene outer wrapping 1667: 2,1 No / kg072kgl? 28 Total: arsenic. 78 ~ 50.78 × 0% -51 million (loss: 0.5%) f oxide powder technique: 37.10 yuan / kg0.95kg3524 epoxy powder Wo 3068 Taiwan juice: 35.235.24 × 8% = 38 dollars' loss: 8%) PE: 10.6 元, / kg3.2kg337d bottom layer of polyethylene plastic: 21.2 yuan / kg0.5, 1kg11.482975 Taiwan ten: 15.22 +4599 × 2% = 46 .12 million (loss: 2%) PE: l0.6 million / kg3.132.86 Primer: 212 yuan kg0.449. : 3j layer polyethylene 3388 epoxy powder: 37.1 yuan / kg0.3 ¨. 13 Total: 53.32} 53.32 × 3% = 55 million (loss: 3%) in the construction of transportation are easily damaged, especially anti-poor low temperature performance,[link widoczny dla zalogowanych], the most suitable for mountain, desert environment. 70-8O's developed an increase of external coating and wrapped with vinyl tape and external coating layer extruded polyethylene, coal tar epoxy, rubber, resins and other materials. Their common feature is that peel strength is poor, prone to shield cathodic protection, the result is electrochemical pitting corrosion, corrosion of the pipe transport, backfill, construction quality and difficult to control. 80-90 years the introduction of the epoxy powder spray coating, and its drawback is easy to damage the construction of the coating, anti-corrosion pipe pull operation, the backfill process to be strict, mending Mending high technical requirements, environment, poor adaptability. In recent years the introduction of the best absorption of foreign anti-corrosion layer, the first three-layer PE anti-corrosion epoxy powder (FBE) 60-80um, the second layer of adhesive (AD) 170-250urn, the third layer of poly ethylene (PE) was 2.5-3.0ram. Melting as one of the three materials, and with the formation of a good solid steel anti-corrosion layer and the protective layer, anti-corrosion life of 45-50 years. 3 different coating comparison of pipeline corrosion resistance coating of External Coatings's excellent corrosion resistance,[link widoczny dla zalogowanych], poor, directly determines the life of the pipeline. Table l lists the number of different anti-corrosion pipeline external anticorrosion coating performance and the advantages and disadvantages. 4 different channels compare the cost of External Coatings some major projects under national bidding and bid, as well as producing units offer a variety of anti-corrosion coating of our construction costs (including: raw material costs and processing fees) for the statistical list 2 5. Conclusion In summary, in a market economy, the economic cost of every construction project is the first consideration. For the buried steel pipe should be based on the design life of the pipeline, and the different geographical environments, from one-time cost of coating maintenance costs of inputs and factors such as the late,[link widoczny dla zalogowanych], comprehensive evaluation of the economic cost of the coating, thus outside the rational choice of pipeline corrosion coating .
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