The new national standard of steel pipe for gas transmission and safety valve

告别“煤气时代”，城市燃气正在进入“天然气时代”。Farewell to the gas era, the city gas is entering the era of natural gas".

According to the national development and Reform Commission official website "natural gas development plan" "13th Five-Year", "13th Five-Year" period to improve the natural gas in primary energy consumption structure in the proportion of development goals, vigorously developing natural gas industry, and gradually the natural gas developed into a main energy, building a modern industrial system with reasonable structure, natural gas the coordination of supply and demand, safe and reliable. Expected from 2017 to 2020, China's natural gas industry will become the golden range".

However, there are also some worries behind the acceleration of the investment in the natural gas industry chain, the city because of the emergence of natural gas explosion incident has gradually increased. According to the author's investigation, there are two main reasons for the tragedy:

On the one hand, the city gas pipeline aging, unable to adapt to the natural gas transmission. The reason is very simple, in the past, the city gas pipeline design is mainly to transport coke oven gas, so the use of cast iron pipe. This kind of iron pipe has a certain corrosion resistance and easy connection and low cost. However, this type of iron pipe after the aging of the fragile texture, easy to break, the vulnerability of poor seismic vulnerability is also exposed, especially the interface is easy to leak into a fatal risk.

At present, although some areas of coke oven gas replacement for natural gas, but the pipeline renovation project is in a state of lag. More of the original cast iron pipe for gas transmission pipeline, the service period is too long, this part of the cast iron pipe aging serious, it is difficult to resist the corrosive gas, live so events gradually increased natural gas pipeline leakage, this is the case in the old district, to avoid a similar tragedy, the transformation of the old district lines must be put on the agenda as soon as possible.

On the other hand, the author found in the course of the investigation, a number of new communities also have a natural gas explosion tragedy. Obviously, this has nothing to do with the aging of the gas pipeline. In fact led to this tragedy the reason lies in the process of construction and renovation of the pipeline, because of too much emphasis on the lowest price bidding, eventually leading to successful enterprises in order to profit only in the pipe on the quality of "Jerry", and then affect the quality of the whole project, local security hidden danger.

This and Xi'an Metro Line 3 in the process of construction, the lowest price on the tender tender cable, resulting in similar problems into the cable construction. In the process of construction of the project bidding, the price is only a relative concept, we can not guarantee the quality of the project. In order to eliminate the quality of the project from the source, we must pay more attention to the quality of the product in the process of bidding, only in this way can we guarantee the quality of the project.

Based on the above two points, to ensure the safety of natural gas in the process of city transportation, imperative transformation pipeline, only the use of high-quality steel pipe for transporting natural gas with safety valve, natural gas as a clean energy can truly benefit the majority of users.

In the process of natural gas transportation, pipeline steel can be divided into three parts: high pressure natural gas main pipeline, medium pressure natural gas pipeline and household pipeline. On the selection of steel pipe, the main pipe of high pressure natural gas is mainly made of seamless steel pipe and longitudinal submerged arc welded pipe. This is limited by the seamless steel tube technology and cost problems, more or to large diameter welded steel pipe.

Medium pressure natural gas branch pipe, because the pressure is small, all in pipe procurement in senior high density polyethylene pipe and galvanized steel pipe with high strength, steel pipe galvanized steel pipe to more households as part of the city, but also the use of stainless steel, but due to the exorbitant price penetration rate is not high.

The media exposure of the event, the current natural gas leak explosion events mainly concentrated in the home link pipeline, the main reason lies in the problem of the interface quality home pipeline, resulting in leakage of natural gas. The reason for this situation is set aside in front of the low price leads to the problem of steel pipe into the natural gas pipeline project in addition to this, and the current steel industry standard is not a result of uneven quality of steel tube has a great relationship.

These substandard galvanized steel in the process of conveying in coke oven gas may be a big problem, but for the natural gas pipe strength and corrosion resistance have higher requirements, transportation of natural gas in some sub standard galvanized steel pipe in safety began to gradually appear.

面对这种情况，友发牵头制定钢管行业新国标来提升整个行业的钢管质量门槛就显得尤其的重要，特别是燃气用管对于钢管耐腐蚀有更高要求。按照新国标要求，对于镀锌钢管的上锌量有了最低300/ 的硬性要求，可是这种最低要求并不适应天然气输气管道用钢要求，天然气输气钢管的上锌量大部分要求要达到500克才能彻底保证管道安全。为了千家万户的安全，友发一贯严格执行行业标准，并且拥有专门的燃气专用管产品，在输气管上用最低500克的上锌量，这极大的提升镀锌钢管的耐腐性和服役寿命。另一方面在镀锌钢管的内外壁厚度方面也有了统一要求，这同样就可以有效避免因为镀锌钢管壁厚“瘦身”导致钢管易脆、断裂等情况出现，进而为居民使用天然气留下安全隐患。Farewell to the gas era, the city gas is entering the era of natural gas".

According to the national development and Reform Commission official website "natural gas development plan" "13th Five-Year", "13th Five-Year" period to improve the natural gas in primary energy consumption structure in the proportion of development goals, vigorously developing natural gas industry, and gradually the natural gas developed into a main energy, building a modern industrial system with reasonable structure, natural gas the coordination of supply and demand, safe and reliable. Expected from 2017 to 2020, China's natural gas industry will become the golden range".

However, there are also some worries behind the acceleration of the investment in the natural gas industry chain, the city because of the emergence of natural gas explosion incident has gradually increased. According to the author's investigation, there are two main reasons for the tragedy:

On the one hand, the city gas pipeline aging, unable to adapt to the natural gas transmission. The reason is very simple, in the past, the city gas pipeline design is mainly to transport coke oven gas, so the use of cast iron pipe. This kind of iron pipe has a certain corrosion resistance and easy connection and low cost. However, this type of iron pipe after the aging of the fragile texture, easy to break, the vulnerability of poor seismic vulnerability is also exposed, especially the interface is easy to leak into a fatal risk.

At present, although some areas of coke oven gas replacement for natural gas, but the pipeline renovation project is in a state of lag. More of the original cast iron pipe for gas transmission pipeline, the service period is too long, this part of the cast iron pipe aging serious, it is difficult to resist the corrosive gas, live so events gradually increased natural gas pipeline leakage, this is the case in the old district, to avoid a similar tragedy, the transformation of the old district lines must be put on the agenda as soon as possible.

On the other hand, the author found in the course of the investigation, a number of new communities also have a natural gas explosion tragedy. Obviously, this has nothing to do with the aging of the gas pipeline. In fact led to this tragedy the reason lies in the process of construction and renovation of the pipeline, because of too much emphasis on the lowest price bidding, eventually leading to successful enterprises in order to profit only in the pipe on the quality of "Jerry", and then affect the quality of the whole project, local security hidden danger.

This and Xi'an Metro Line 3 in the process of construction, the lowest price on the tender tender cable, resulting in similar problems into the cable construction. In the process of construction of the project bidding, the price is only a relative concept, we can not guarantee the quality of the project. In order to eliminate the quality of the project from the source, we must pay more attention to the quality of the product in the process of bidding, only in this way can we guarantee the quality of the project.

Based on the above two points, to ensure the safety of natural gas in the process of city transportation, imperative transformation pipeline, only the use of high-quality steel pipe for transporting natural gas with safety valve, natural gas as a clean energy can truly benefit the majority of users.

In the process of natural gas transportation, pipeline steel can be divided into three parts: high pressure natural gas main pipeline, medium pressure natural gas pipeline and household pipeline. On the selection of steel pipe, the main pipe of high pressure natural gas is mainly made of seamless steel pipe and longitudinal submerged arc welded pipe. This is limited by the seamless steel tube technology and cost problems, more or to large diameter welded steel pipe.

Medium pressure natural gas branch pipe, because the pressure is small, all in pipe procurement in senior high density polyethylene pipe and galvanized steel pipe with high strength, steel pipe galvanized steel pipe to more households as part of the city, but also the use of stainless steel, but due to the exorbitant price penetration rate is not high.

The media exposure of the event, the current natural gas leak explosion events mainly concentrated in the home link pipeline, the main reason lies in the problem of the interface quality home pipeline, resulting in leakage of natural gas. The reason for this situation is set aside in front of the low price leads to the problem of steel pipe into the natural gas pipeline project in addition to this, and the current steel industry standard is not a result of uneven quality of steel tube has a great relationship.

These substandard galvanized steel in the process of conveying in coke oven gas may be a big problem, but for the natural gas pipe strength and corrosion resistance have higher requirements, transportation of natural gas in some sub standard galvanized steel pipe in safety began to gradually appear.