Steel pipe anticorrosive & heat-insulated foam jacket molding technology is the new technology popularized in domestic oil fields in 1980s after original Ministry of Petroleum Basic Construction Bureau organized experts to visit Canada for inspection and review. On base of foreign ”°two-step”± molding technics, in 1983, Shengli Oil field Process Engineering Research Institute firstly extended ”°one-step”± molding technology, that is, one-time molding of steel pipe foam anticorrosion and heat-insulation technology and outside heat-insulated jacket layer, which is called ”°one-step”± operation. The success of this process engineering not only enhances operating efficiency but also greatly saves material, reduces cost and makes construction convenient. Soon, this technology was popularized in oil fields all over the country and acquired Shandong Province Ten Excellent Scientific & Technological achievements. Furthermore, it acquired national invention patent in 1985 and till now, no ”°one-step”± technology come into the world in our country.
         The key of influencing popularizing ”°one-step”± molding technics in foreign countries is that, color of foam material adopted domestically is yellow and jacket layer is yellow polyethylene material, which is commonly called yellow jacket but generally used in foreign countries is black jacket. However, there are series of technical problems of our ”°one-step”± operating line haven't solved, such as splicing strength, protective layer adopting black jacket, etc.
I Six technical breakthroughs
1. Breakthrough of becoming into black (jacket) from yellow (jacket)
2. Foaming location visibility technology breakthrough
3. Breakthrough of splicing technology of foam and jacket
4. Adopt pitch polyurethane foam plastic as heat-insulated material
5. Breakthrough of rectifying organization is converted into hydraulic pressure drive from electric drive.
6. Breakthrough of splicing strength of anti-corrosive and heat-insulated layer.
II Excellent performance-price ratio
New ”°one-step”± operating line owns advantages of single machine combination and can be combined at will according to technic requirement. Furthermore, its cost and price are both not higher than ”°one-step”± operating line.
III Excellent economic flexibility
1. After adopting new ”°one-step”± operating line, owing to superiority of machine and excellent splicing property of jacket and heat-insulated layer, the pipe tie-in doesn't damage easily and waterproof cap in technics can be cancelled to reduce cost of anticorrosion and heat-insulation by 20% to 30% greatly.
2. Adopting pitch polyurethane foam plastic can reduce cost by 5% to 10%
3. Anticorrosion and heat-insulation service life is prolonged and improved by 10 to 20 times than former ”°one-step”± method.
4. Sunlight resistance and anti-detonating property of pipeline is strengthened.
IV Application Condition & Prospect
Application in 400km pipe of Qinghai Oil Field further proves that the new ”°one-step”± technics is really feasible and the operation of equipment is simple and product quality is excellent. Liaohe Oil Field and many other oil fields have ordered this kind of product and technics.
In recent two years, Qingdao Dacang Pipe Anti-corrosive & Heat-insulated Equipment Co., Ltd, aiming at existing problems of ”°one-step”± method, organizes experts to tackle key problems to acquire six key technical breakthroughs and own essential and technical breakthrough on past general ”°one-step”± operating line, which is called new ”°one-step”± operating line by us.