How many preheat holes must cutting tips used with liquefied fuel gases have at a minimum?

Cutting tips that use liquefied fuel gases, such as acetylene, require a minimum of six preheat holes to ensure proper operation. These preheat holes are critical for heating the metal before the cutting process begins. This process helps to create a smoother cutting action and enhances the overall efficiency of the cutting tip by ensuring that the metal reaches the needed temperature for effective cutting.

The design of the cutting tip with six preheat holes allows for an adequate flow of the fuel gas, promoting consistent heating and improving the combustion process. This is essential because if the metal is not preheated adequately, it can lead to jagged cuts or difficulties in the cutting process, which undermines efficiency and safety.

Other numbers of preheat holes, such as four, eight, or ten, do not meet the minimum requirements set by industry standards for optimal performance when using liquefied fuel gases. Maintaining the correct number of preheat holes is vital for achieving the desired cutting results and ensuring safe operational practices.