



7.1.3 Cylinders shall be designed with one or two openings along the central axis only.Threads shall extend completely through the neck or have sufficient threads to allow full engagement ofthe valve.
7.1.4 The cylinders shall be designed for high reliability under sustained load and cyclic loading. Therefore,it is necessary to take account of the properties of the individual composite fibres and to establish theirrespective minimum fibre stress ratios. The fibre stressratio is defined asthe fibre stress at designminimumburst pressure divided by the
fibre stress at 2/3 test pressure. The minimum fibre stress ratios shall be as follows:
—for glass:3,6;
—for aramid:3,1;
—for carbon:2,4;
7.1.3 气瓶仅可沿中心轴线设计一处或两处开口。螺纹需贯通瓶颈全长,或保证螺纹长度足以与阀门完全啮合。
7.1.4 气瓶设计需保证在持续载荷与循环载荷作用下具备高可靠性。因此,需考量各类复合纤维自身性能,并确定各自的最小纤维应力比。纤维应力比定义为设计最小爆破压力下的纤维应力与三分之二试验压力下的纤维应力的比值。各类纤维对应的最小纤维应力比规定如下:
——玻璃纤维:3.6;
——芳纶纤维:3.1;
——碳纤维:2.4;







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