How are the LPG Tank Dish End Head Manufactured?

The processing methods for liquefied petroleum gas (LPG) storage tank heads are generally divided into two categories: integral forming and segmented forming. Integral forming is mainly divided into stamping forming and spinning forming according to the processing method.

Standard LPG storage tank heads are generally formed by stamping, but non-standard heads or heads with large diameters are typically formed by spinning. Spinning offers advantages over stamping, such as saving on mold costs and allowing for dimensional adjustments.

Cold spinning is generally used for spinning LPG storage tank heads. However, it becomes difficult when the head thickness is high or the material strength is very high. For heads near the limits of cold spinning equipment capacity, cold spinning can cause material delamination and surface micro-cracks; cold spinning is impossible for heads exceeding the capacity. In these cases, hot spinning can be used.

Hot spinning uses flame jet heating. Because space needs to be left for processing and heating, the insulation equipment cannot be completely enclosed, resulting in a much less effective heating method than furnace heating. Therefore, uneven temperature inevitably leads to inconsistent microstructure. Metallographic and mechanical property analyses of the surface R-section, transition r-section, and straight edge of the LPG storage tank head showed that while all results were satisfactory, significant differences existed between different areas. Furthermore, the results of processing heads made of different materials also vary.