《蒸汽锅炉安全监察规程》第100条中明确规定:“压力表装用前应做校验,并在刻度盘上划红线指出工作压力。”这里强调红线的位置要划在刻度盘上。可是,一些单位不了解这一规定的道理,把最高容许工作压力的红线划在压力表的玻璃面上。这是不对的,主要有以下三点理由: 1.压力表的 Article 100 of the Code for Safety Supervision of Steam Boilers clearly states: “The pressure gauge should be calibrated before use and a red line should be marked on the dial to indicate the working pressure.” The emphasis here is on the red line on the dial. However, some units do not understand the rationale for this provision and draw the red line, which is under the maximum allowable working pressure, on the glass surface of the pressure gauge. This is not right, mainly for the following three reasons: 1. Pressure gauge