Gas Steigleitungsvorrichtung und Verbindungsverfahren

摘要

An improved gas riser comprises a pipe nipple (60), casing (100), adaptor sleeve (70), tube (40), and stiffener (120). The adaptor sleeve features an internal stop which accurately positions an end of the plastic tube before the tube is plastically deformed into grooves (94) in an internal surface of the adaptor sleeve. Each of the first and second ends of the adaptor sleeve can be manufactured in different diameters to fit pipe nipples and casings that are required by different code regulations. The method of assembling the gas riser comprises inserting a first end of the adaptor sleeve (70) into a second end of a pipe nipple (60), inserting a second end of the adaptor sleeve into a first end of the casing (100), welding the second end of the pipe nipple and the first end of the casing to the adaptor sleeve, inserting a stiffener (120) into a tube end, inserting the tube end into the adaptor sleeve, pulling a mandrel through the assembly which plastically deforms the stiffener and forms a seal by urging the tube (40) into grooves (94) on an interior surface of the adaptor sleeve.