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丝扣过硬勉强用。丝扣套硬了必然扭的扣少。如果强行拧紧,极易紧坏管件,一般管径在40毫米以下的合格的丝扣应是:松三紧五梢二扣。大概尺寸凑合做。管道连接时的调整误差在5毫米之内波动。假如用大概尺寸下料,管道势必过长或过短,造战连接困难或浪费材料。马虎除锈不彻底。除锈工作没做好,在上完面漆遇潮后又会出现锈蚀,使管道使用寿命缩短。拧紧螺栓过紧死。过大的预紧力会降低垫片的弹
Screws are too hard to use. The buckle is hard and the buckle must be twisted. If tightened by force, it is easy to damage the pipe. Generally, the qualified thread with a diameter of less than 40 mm should be: loose three tight five tips and two buckles. Probably size make do. The adjustment error during pipe connection fluctuates within 5mm. If the material is to be taken under a rough size, the pipeline will be too long or too short, making battle connection difficult or wasting material. Scavenging is not thorough. The rust removal work is not done well, and corrosion will occur after the top coat meets the tide, which shortens the service life of the pipeline. Tighten the bolt tightly to death. Excessive preload will reduce the elasticity of the gasket