干密封管螺纹

[中文适用范围]： 本文件已被宣布为“稳定”，并且将不再接受货币定期审查。用户有责任验证技术指导的持续适用性。干密封螺纹应符合ASME B1.20.3。本标准涵盖的Dryseal美标锥管螺纹、Dryseal美标燃油内直管螺纹和Dryseal美式中间内直管螺纹符合美国标准ASA- B2.2。本标准中的干密封SAE-短锥管螺纹除螺纹长度外均符合干密封美标锥管螺纹，其长度为 [外文原描述]： The Dryseal American Standard Taper Pipe Thread, the Dryseal American Fuel Internal Straight Pipe Thread and the Dryseal American Intermediate Internal Straight Pipe Thread covered by this standard conform with the American Standard ASA-B2.2. The Dryseal SAE-Short Taper Pipe Thread in this standard conforms with the Dryseal American Standard Taper Pipe Thread except for the length of thread, which is shortened for increased clearance and economy of material.The significant feature of the Dryseal thread is controlled truncation at the crest and root to assure metal to metal contact coincident with or prior to flank contact. Contact at the crest and root prevents spiral leakage and insures pressure-tight joints without the use of a lubricant or sealer.Lubricants, if not functionally objectionable, may be used to minimize the possibility of galling in assembly.Cross Reference: ASA/B2.2