JP1661493S - Pickling acceleration member for metal pipes - Google Patents

Abstract

This product is a pickling promotion member for metal pipes, which is made by forming a heat-resistant and acid-resistant resin in a spiral shape. It is attached by wrapping it around the outer periphery of the metal pipe when it is lifted with a sling and immersed in a pickling bath filled with an acid solution such as sulfuric acid, hydrofluoric acid, or nitric acid. The metal pipe pickling acceleration member is a spirally curved solid rod having both ends. Since the metal pipe pickling acceleration member can be elastically deformed so as to widen the distance between both ends of the solid rod, the work of attaching it to the metal pipe is facilitated. Moreover, the pickling acceleration member for metal pipes has the rigidity to maintain the shape of the spiral even when it is not attached to the metal pipe. Therefore, when attached to the metal pipe, it is possible to surround the entire periphery of the metal pipe and to create a gap between the metal pipe pickling promotion member and the metal pipe. The ratio DA/DB of the cross-sectional diameter DA of the pickling-promoting member for metal pipes to the diameter DB of the outer periphery of the pickling-promoting member for metal pipes is about 0.1. Thereby, moderate rigidity is obtained. Further, the solid rod that forms the pickling acceleration member for metal pipes is curved by extending an additional 90 degrees (one-fourth of a turn) after making a full turn in the circumferential direction. This overlap of 90 degrees makes it possible to change the diameter of the pickling promoting member for metal pipes, so that the pickling promoting member for metal pipes can be used for metal pipes of various diameters. As shown in "reference diagram 2 showing the state of use", during pickling, the metal pipe pickling promoting member attached to each metal pipe is pushed by the adjacent metal pipe and deformed, and the metal pipe and the metal pipe acid pickling member are deformed. A delicate gap is formed between the cleaning promoting members. As a result, the acid solution enters between the metal pipe and the metal pipe pickling promoting member to promote pickling. The cross-section of the solid rod forming the pickling promotion member for metal pipes is circular. As a result, the contact area between the metal pipe and the metal pipe pickling promotion member is reduced, and the pickling promotion effect is enhanced.