Head plant head material as δ 'is head plant head material, shape, thickness, forming methods, techniques and operational skills and other factors related to indefinite value. Therefore, even if the plant head and the cylinder head inner diameter Di, the steel thickness δs are equal, the difference between the outer diameter and the outer circumference is not equal. So head plant head and cylinder assembly, the inner and outer circle can not simultaneously aligned only in accordance with the container production process, outside the circle to determine the alignment (control head plant head of the outer circumference tolerance, equivalent Japan JISB8247 standard, A kind of head plant head), or in diameter aligned (control head plant head inside diameter tolerances, very Japanese standard Class B head plant head.) head uses: head the petrochemical, food and pharmaceutical atomic energy to the pressure vessel equipment in many industries indispensable pressure vessel head is on the cover, is one of the main pressure vessel pressure parts. Head of the pressure vessel is directly related to the quality of the long-term safe and reliable operation. Head shape requirements: JB/T4746 head standard requirements: ● head must be full sample checks shape. ● Shape tolerance: convex no more than 1.25% Di, recessed no more than 0.625% Di. ● Transition patterns within a radius of not less than the specified value. ● spherical body: head size affects the curvature of the transition section thickness ●: lower sphere and cylinder connection peak stress ● Straight Edge: Avoid transition peak stress and the cylinder group of welding stress superposition Longwan Hongyu Metal head plant site : Wenzhou City view golden sand town seven A Tel :0577 -86,925,157 Fax 577 -86925750 Mobile: 13057722577 15355996788 Contact: Sun Shaodi URL: www.hyft.cn