Definition Of The Thickness Of The Head – GB150-1998


Definition of the thickness of the head – GB150-1998

    Xinxiang Sida Head Co., Ltd. is mainly engaged in the production of heads, which can be pressed by whole or in part. It can be used for smelting industry with ¢159–¢6000mm, thickness 2–100mm various materials for boiler and pressure vessel heads. Furnace cap, furnace bottom, ladle, etc. In addition, our company also has a space steel structure supporting parts welding ball and bolt ball production line. The performance indexes reach GB150-1998, GB50205-2001 and other standards. The products are of good quality and well received by the majority. User’s praise.

    (1) According to the provisions of GB150-1998

    GB150-1998 requires that the forming thickness of the convex head and the hot coil cylinder is not less than the nominal thickness minus the negative deviation of the steel sheet, that is, the forming thickness is δn-C1. As a result, the design and manufacturing are twice increased in thickness on the basis of the design thickness to ensure the forming thickness, and the increment of the quantifier (Δ1+Δ2) is not fully reflected in the design calculation, so it is necessary to present it in the drawing. * Small thickness requirement, that is, the designer should mark the nominal thickness and the *** small forming thickness on the drawing, so that the manufacturing unit can determine whether to increase the manufacturing thinning amount according to the manufacturing process and the design roundness of the original design.

(2) Small forming thickness refers to the thickness obtained by calculating the thickness and the small thickness of the component *** specified by the standard plus the corrosion allowance. The nominal thickness and *** small forming thickness (with parentheses) should be indicated in the drawing.

    (3) Regarding the calculation of the opening reinforcement on the head, GB150-1998 (8-11):

    A1=(B-d)(δe-δ)-2δet(δe-δ)(1-fr)

    Where A1 is the effective thickness of the shell minus the excess area beyond the calculated thickness; δe = δn – (C1 + C2).

    In the design, if the nominal thickness is directly calculated on the drawing, it does not reflect the real situation of the reinforcement calculation, which may result in insufficient strength; if the reinforcement is calculated based on the design thickness (δ+C2), ie δe=δ +C2, then A1=(Bd)C2-2δetC2(1-fr) will cause an increase in the local reinforcing area. Therefore, it is necessary to determine a small thickness of *** to ensure that the opening reinforcement calculation of the head meets the strength requirements.

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