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螺旋焊管生产使用产品特点概况

文章出处:   发布时间:2018-09-17 11:28:56   浏览:32

螺旋焊管生产使用产品特点概况:手开工具除锈能到达Sa2级,动力工具除锈可到达Sa3级,若钢材外表附着结实的氧化铁皮,工具除锈成效不幻想,达不到防腐施工请求的锚纹深度酸洗。直缝管所受的主应力恰恰垂直于管材抗冲击才能最低的方向,而螺旋焊管则错开了管材抗冲击才能最低的方向,使螺旋焊管焊缝长的优势改变成上风。螺旋焊管的防腐办法也从抑止其中某一进程。

Features of spiral welded pipe production and use: hand tool rust removal can reach Sa2, power tool rust removal can reach Sa3, if the steel surface adhered to a solid oxide scale, tool rust removal effect is not fantastic, can not meet the requirements of anti-corrosion construction anchor line depth acid cleaning. The principal stress of the straight seam pipe is just perpendicular to the direction where the impact resistance of the pipe can be lowest, while the spiral welded pipe staggers the direction where the impact resistance of the pipe can be lowest, thus changing the advantage of the spiral welded pipe weld length into the upper wind. The anticorrosion method of spiral welded pipe also restrains one of the processes.

在运用进程中,螺旋焊管的主应力方向,即焊管轴线方向确当量缺陷长度比直缝管小;其次,由于管线钢均为轧制钢板,冲击韧性有较大的各向同性,顺轧制方向的CVN值可比垂直于轧制方向的CVN值高3倍。

In the process of operation, the principal stress direction of spiral welded pipe, i.e. the equivalent defect length in the axial direction of the welded pipe, is smaller than that in the straight seam pipe; secondly, because the pipeline steel is rolled steel plate, the impact toughness is more isotropic, and the CVN value along the rolling direction can be three times higher than that perpendicular to the rolling direction.

运用钢丝刷等工具对钢材外表中止打磨,能够去除松动或翘起的氧化皮、铁锈、焊渣等。

Using steel wire brush and other tools to stop grinding steel surface, can remove loose or raised oxide scale, rust, welding slag, etc.

手开工具除锈能到达Sa2级,动力工具除锈可到达Sa3级,若钢材外表附着结实的氧化铁皮,工具除锈成效不幻想,达不到防腐施工请求的锚纹深度酸洗。

Hand tool rust removal can reach Sa2, power tool rust removal can reach Sa3, if the steel surface adhered to a solid oxide scale, tool rust removal effect is not fantastic, can not reach the anticorrosive construction requirements of the anchor line depth pickling.

直缝管所受的主应力恰恰垂直于管材抗冲击才能最低的方向,而螺旋焊管则错开了管材抗冲击才能最低的方向,使螺旋焊管焊缝长的优势改变成上风。

The principal stress of the straight seam pipe is just perpendicular to the direction where the impact resistance of the pipe can be lowest, while the spiral welded pipe staggers the direction where the impact resistance of the pipe can be lowest, thus changing the advantage of the spiral welded pipe weld length into the upper wind.

螺旋焊管的防腐办法也从抑止其中某一进程动手。

The anticorrosion method of spiral welded pipe also prevents one of the processes from starting.

如在管道外壁加防腐涂层,可增大回路电阻,添加腐蚀电流;外加直流电源,使焊管对土壤构成负电位、构成阴极保护,可消弭阴阳极电位差,从基本上中止阴阳极进程的中止。

If an anticorrosive coating is added to the outer wall of the pipeline, the circuit resistance can be increased and the corrosion current can be added; if a DC power supply is added, the welding pipe will form a negative potential to the soil and form a cathodic protection, the potential difference between the cathode and the cathode can be eliminated, and the process of the cathode and the anode can be basically stopped.

防腐涂层法治表,阴极保护法治标。

Anticorrosive coating rule table, cathodic protection rule of law.

但是一旦防腐涂层破损,露铁局部会减速局部腐蚀。

But once the anticorrosive coating is damaged, the exposed iron will slow down local corrosion locally.

故防腐涂层与阴极保护相分离才是表本兼治的办法,经济而无效。

Therefore, the separation of anticorrosive coating and cathodic protection is the only way to treat this problem, which is economic and invalid.

美国等国度已明白规则,采用了防腐涂层的同时必需采用阴极保护。

Countries such as the United States have understood the rule that cathodic protection must be used when anti-corrosion coatings are applied.

但关于乡村燃气零碎,由于公开管网稠密,阴极保护的外加电源对其它管道搅扰大,会构成本身受益、他家受益的场面。

However, with regard to rural gas fragmentation, due to the dense open network, the external power supply of cathodic protection will disturb other pipelines greatly, which will constitute a scene of benefiting oneself and others.

而采用比焊管电位负的金属资料与螺旋焊管相连的阳极保护规律不会呈现此类状况,因此,乡村燃气的输气干管应采用防腐涂层与阳极相分离的防腐办法。

However, the anodic protection law of spiral welded pipe connected with metal material with negative specific welded pipe potential will not show this kind of situation. Therefore, the main gas pipeline of rural gas transmission should adopt anticorrosive coating and anodic phase separation anticorrosive method.

关于其他压力较低的非主干管道,则普通间接采用防腐涂层法。

For other non pressure main pipelines with low pressure, the anticorrosive coating method is usually adopted.

目前埋地燃气管道常用的外防腐涂层次要有三层PE复合构造、环氧树脂粉末、煤焦油瓷漆、环氧煤沥青和PE胶带等五类。

At present, the external anticorrosive coatings commonly used for buried gas pipelines include three-layer PE composite structure, epoxy resin powder, coal tar enamel, epoxy coal tar pitch and PE adhesive tape.

三层PE复合构造、环氧树脂粉末防腐涂层功能优异,因此也是欧美国度埋地管道的次要防腐涂层。

Three-layer PE composite structure and epoxy resin powder anticorrosive coating have excellent function, so it is also the secondary anticorrosive coating of buried pipeline in Europe and America.

从耐用年限、保护用度等片面的经济要素思索,普通首选三层PE复合构造防腐涂层。

Considering the one-sided economic factors such as durability and protection, the three-layer PE composite anticorrosive coating is the first choice.

在阳极保护法中,普通采用镁合金作为阳极对管道中止保护。

In the anode protection method, magnesium alloy is usually used as anode to stop the pipeline protection.

由于在输入电流进程中蒙受毁坏,镁合金阳极的设想运用年限最好与管道的运用年限相婚配,既不发生糜费也未几添加保护用度。

Due to the destruction of the input current, the envisaged service life of the magnesium alloy anode is best matched with the service life of the pipeline, with neither waste nor protection.

但应留意的是,当土壤电阻率太高和被保护管道穿过水域时,不宜采用阳极保护。

However, it should be noted that anodic protection is not suitable when the soil resistivity is too high and the protected pipeline passes through the water area.

不同的防腐办法有不同的防腐质量和用度,应依据被保护螺旋焊管的不同压力、不同用处及其所处的不同环境和保送的不同燃气,分析片面地思索防腐办法和防腐用度。

Different anticorrosion methods have different anticorrosion quality and usage. The anticorrosion method and anticorrosion usage should be considered unilaterally according to different pressure, different usage, different environment and different gas delivered.

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