PN6.5 MPa DN550锚固法兰设计及试验研究

Design and Experimental Investigation of PN6.5 MPa DN550 Anchoring Flange

根据某输油管道设计条件及要求,对PN6.5 MPa DN550锚固法兰的选材、结构设计、应力计算与强度校核、焊接试验、压力弯曲试验等方面进行研究。分析认为选用07Mn Mo VR钢锻制锚固法兰较为合适。锚固法兰以GB 150中宽面法兰为模型设计结构和关键尺寸,并参照相关法兰和GB 50253中埋地输油管道及附件的设计方法进行应力计算与强度校核。锚固墩单位面积承受压力Fw(4.78 MPa)小于抗压强度设计值Fc(14.3 MPa),锚固法兰环向应力σh(152.7 MPa)、轴向应力σa(61.7 MPa)、弯曲应力σf(37 MPa)均小于许用应力[σ](173 MPa),结构强度符合设计标准。焊接和压力弯曲试验结果表明,07Mn Mo VR锚固法兰与L415M袖管焊接后的质量及结构强度、承压能力均满足设计要求,整体性能和质量安全可靠。

The material, structure design, stress and strength calculations, welding testing and hydrostaticbending testing of PN6.5 MPa DN550 anchoring flange are investigated in accordance with one oil transmission pipeline design conditions and requirements. It is more reasonable to forge anchoring flange with 07MnMoVR steel. The anchoring flange＇s structures and key dimensions are designed by mold of wide flange under GB 150 ,stress and strength calculations are referenced design method in flange codes,buried pipeline and piping system components codes. The unit area under pressure of anchoring pier Fw （4.78 MPa） is less than compressive strength design value Fc （14.3 MPa）. The anchoring flange＇s axial stress σh（152.7 MPa）, axial stress σa （61.7 MPa）,bending stress σf（37 MPa） are all less than allowable stress [σ] （ 173 MPa）, so the structure strength of anchoring welding testing and hydrostatic-bending testing results pressure capacity of 07MnMoVR steel anchoring flange requirements, the performance and quality of anchoring flange is conformed to design standards. The show that welding quality, structure strength and and L415M steel pipe after welding is meet design flange is safe and reliable.