产品名称：20m³液化石油气槽车上装
Product name: Upper loading part of 20m3 liquefied petroleum gas tanker
直径：2000mm 标准GB150-2024/GB19905-2017
Diameter:2000mm Standard: GB150-2024/GB19905-2017
罐体规格参数：
Specification & parameters of tank body
罐体形状：正圆形，前后椭圆封头
Tank body shape: Perfectly round, the front end and the rear end are elliptical.
设计温度：-20℃-50℃
Designed temperature: -20℃-50℃
设计压力：1.79Mpa
Designed pressure: 1.79Mpa
材料：壳体与封头：Q345R，执行标准：GB713-2014
Material: Housing & end head: Q345R, Execution standard: GB713-2014
封头厚度：14mm
Ene head thickness: 14mm
筒体厚度：12mm
Cylinder thickness: 12mm
热处理方式：整体热处理
Thermal treatment method: Overall thermal treatment
内部防浪板数量：2道
Number of interior breakwaters: 2pcs
内加强圈数量：3道
Number of interior reinforced rings: 3 pcs
焊接控制Welding control：加强圈与筒体应采用全焊透连续焊焊接结构，所有焊角需凹弧过渡；Regarding the reinforced rings & the cylinder, we shall adopt fully-welded continuous structure, all the welding angles shall be passed with the recessed arc.
与罐体焊接的垫板应与罐体贴合紧密，垫板四角均需倒圆角（未注圆角为R25),宜避开罐体A、B类焊缝，垫板周边采用续焊，焊角高度不得小于较薄件厚度，垫板在不影响焊接的部开不小于6的透气孔，构件与垫板的焊接接头距垫板边缘的宽不小于25mm;
The backing plate welded with the tank shall cling on to the tank closely, and the four angles of the backing plate shall be chamfered (If the angle isn’t chamfered, it’s R25), don’t use type A & type B of the welding seams of the tank, and in the surrounding of the backing plate, it should be welded continuously. The welded angle height can’t be less the thickness of the thinner pieces. Without interference in the welding, please punch a venting hole (no less than 6mm) on the backing plate, and the distance between the welding joint connecting the structure and the backing plate & the backing plate edge can’t be less 25mm (width).
焊接接头的表面不得有表面裂纹、未焊透、未熔合、咬边、表面气孔、弧坑未填满等缺陷；焊缝与母材应当凹弧过11、罐体耐压试验合格后，还应当对焊接接头表面进行100%磁粉检测，符合NB/T47013.4-2015,1级合格；
On the surface of the welding joint, it can’t appear to crack, incomplete welding/melting, undercut, air hole, unfilled arc pit etc flaws; For the welding seam and the base metal, they shall be arced for more than 11 s, after the tank body passed the pressureproof test, it shall pass the magnetic particle testing(100%) aiming at the welding joint surface. Then we can confirm, it conforms to Grade 1 of NB/T47013.4-2015.