——New pipeline core technology creator——
Development Status of Safe Gas System
一、Status of Pipe Network
At present，indoor gas pipeline mainly uses two categories such as hot dip galvanized steel pipe wire, stainless steel corrugated hose buried in the dark .Gas companies in major cities report the general situation as followings:
①Indoor wire connection of hot-dip galvanized steel pipe: the cost of installation and later maintenance is high,easy to corrosion and paint removal.The cool and damp place(such as floor and cabinet table)will have serious corrosion in 10 to 15 years, the replacement and the transformation will be very very difficult too,easy to cause safety accidents.
②Stainless steel corrugated hose:easy installation,the cost of material and construction are high,suitable for dark burial
|
Corrosion Resistance Ability |
Items
|
Thin Wall Stainless Steel |
Hot Dip Galvanized Pipe
|
Stainless Steel Corrugated Hose |
|
CO2、H2O、SO2、 H2S Atmospheric corrosion |
Non-corroding |
Easy to corrode,especial in the ground |
Non-corroding |
|
PH is low in alkainity or high in acidity
|
Non-corroding |
Easy to corrode |
Non-corroding |
|
Hot and cold cycle corrosion |
≥100℃ |
Have educt |
≤80℃ |
|
Impurities get together |
Not easy |
Easy |
Not easy |
|
Sulphide |
Non-corroding |
Easy to corrode |
Material embrittlement |
|
Physical properties |
（N/mm2） Strength of extension |
≥520 |
≥294 |
≥49 |
|
Wearing-resistance ability |
high |
common |
low |
|
Low temperature adaptation |
≤－95℃ |
≤－45℃ |
Low temperature adaptation |
|
High temperature adaptation |
≥120℃ |
≥95℃ have educt |
≥80℃ tissue change |
|
Loss of flow |
Few |
Much |
Common |
Installing operation |
Installation process |
Fewer |
Much more |
Much |
|
Installation qualification rate |
High |
Lower |
Higher |
|
Economic benefit |
price |
higher |
lower |
high |
|
Installation cost |
Lower |
High |
High |
|
Cost of maintenance |
Free maintenance |
High |
Common |
|
Service life |
≥50 |
（wire joints are easy to corrode） |
50 year |
|
Cost performance |
High |
Low |
Low |
Comprehensive Benefits |
Replacement time |
50 year |
15 year |
50 year |
|
Maintenance |
Free maintenance |
Need maintenance for anti-corrosion |
Need maintenance |
|
Comprehensive cost |
low |
High |
High |
二、National Policy
At present,the design within 18 floors of the community are required to use the form of table out of the house,above the 18 floors all use wire remote transmission meter.Therefore,the thin wall stainless steel gas pipe of press fitting has been widely used in indoor gas pipeline.In the design of thin wall stainless steel gas pipe,the problem related to the construction , operation management , maintenance ,engineering cost should be considered .Ministry of Housing and Urban-Rural Development of People’s Republic of China attaches great importance to the promotion and use of thin wall stainless steel pipe.In 2006,revision of <Urban Gas Design Specifications>(GB 50028)opened a gate for thin wall stainless steel pipe use indoor gas pipeline.In 2009,the latest revision of<Urban Gas Indoor Construction and Quality Acceptance Specification>(CJJ94)is also officially recommended thin wall stainless steel pipe
三、Application Scenarios
① Indoor gas pipe
②Wall climbing pipe
③Riser
四、Connection Method
● Double Press Fitting
● Carbon Steel of Press Fitting
五、Solution
Stainless steel pipe and carbon steel pipe both have good performance and beautiful appearance.Reducing the cost of operation and maintenance without doing anti-corrosion.The construction speed is 3-5 times faster than seamless steel pipe of weld and galvanized steel pipe wire connection,which great improves the construction progress and reduces customers’ complaints.Less labor,low installation cost,no need water,electricity .What’s more,as operating tools,it can avoid users’ unauthorized pipe dismantling,pipe changing and pipe shifting,reduce risk and prevent users from stealing gas.From long-term development of the enterprise,it can save the cost of operation and maintenance as well as safety cost ,improve the contract performance rate and users satisfaction .
六、Installation Standards
●GB 50028-2006 <Urban Gas Design Specifications>
●CJJ94-2009<Code for construction and quality acceptance of urban gas indoor Engineering>
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Coated carbon steel pipePlastic-coated carbon steel pipeline is galvanizing in the pipeline's surface and adopting polymer formulation material. After plasticizing and curing , a uniform ,dense and smooth plastic coating is formed on the surface of the pipe and a steel-plastic combination is formed. It not only has the hardness as galvanized steel pipe , but also has the advantages of wear-resistance and corrosion-resistance as plastic pipe. It is a very cost-effective and green energy saving pipes for service life tops 50 years.
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Coated carbon steel pipePlastic-coated carbon steel pipeline is galvanizing in the pipeline's surface and adopting polymer formulation material. After plasticizing and curing , a uniform ,dense and smooth plastic coating is formed on the surface of the pipe and a steel-plastic combination is formed. It not only has the hardness as galvanized steel pipe , but also has the advantages of wear-resistance and corrosion-resistance as plastic pipe. It is a very cost-effective and green energy saving pipes for service life tops 50 years.
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Coated carbon steel pipePlastic-coated carbon steel pipeline is galvanizing in the pipeline's surface and adopting polymer formulation material. After plasticizing and curing , a uniform ,dense and smooth plastic coating is formed on the surface of the pipe and a steel-plastic combination is formed. It not only has the hardness as galvanized steel pipe , but also has the advantages of wear-resistance and corrosion-resistance as plastic pipe. It is a very cost-effective and green energy saving pipes for service life tops 50 years.
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