[Phase 1 of Time-Limited Quick Response Contest] 022 [Completed]
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Rules: 1. If you want to answer immediately, give a score of +1 wealth to Floor 1 and write your answer in the “Reason for action” field (only the content within parentheses); see the diagram below for details. 2. One “*” represents 1 Chinese character (or 1 digit), and the answer must match exactly to be considered correct. 3. The first person to answer correctly will receive +10 wealth points; please reply in the replies on floor 2 or below to claim the reward ； 4. The scope of questions covers the commonly used standards and experience manuals for the process and piping fields ； 5. The difficulty level of the questions increases from easy to difficult. 6. Lower-grade students are welcome to participate actively. Question for this issue: 022. Pipe threads (tapered pipes) are divided into (*****), (*****), and NPT – a total of 2 types. Standard answer: 55° thread; 60° thread. Winner: pdms0009. This post was last edited by hutom123 on 2009-3-26 08:13
022. Pipe threads (tapered pipes) are divided into two types: (tapered pipe threads) and (sealed pipe threads) (NPT).
U.S. standards (Imperial system, 60° thread angle): NPT: National Pipe Taper Thread; NH: National Hose Coupling Thread; NPS: National Pipe Straight Thread. British standards (Imperial system, which is also an ISO standard, 55° thread angle): BSP: British Standard Pipe Thread; BSPP: British Standard Pipe Thread Parallel; BSPT: British Standard Pipe Thread Taper. Chinese standards (Imperial system, which is also an ISO standard, 55° thread angle): Code RP for Imperial sealed circular internal threads, Rc for Imperial sealed tapered internal threads, R for Imperial sealed tapered external threads, R1 for use with Imperial sealed circular internal threads, and R2 for use with Imperial sealed tapered internal threads. Is the (NPT) mentioned later indicating that the answer should refer to U.S. standards?
Cylindrical pipe thread； Tapered pipe thread
Tapered pipe threads and sealed pipe threads
Pipe threads (tapered pipes) are divided into two types: (imperial) and (American) (NPT).
Pipe threads (tapered pipes) are divided into two types: (sealed tapered pipe threads) and (unsealed tapered pipe threads), as well as NPT. This post was last edited by Xiaohe on 2009-3-19 17:38.]
Tapered internal thread; Tapered external thread
Inside the sealing cone, outside the sealing cone
Tapered internal thread Tapered external thread
Cylindrical pipe thread； Tapered pipe threads.
Pipe threads (tapered pipes) are divided into two types: (cylindrical internal threads) and (tapered pipe threads) (NPT)
(55° tooth profile angle), (60° tooth profile angle)
Internal cylindrical thread Internal tapered thread
(55° conical tube), (60° conical tube)
(Right-threaded pipe threads), (Tapered-threaded pipe threads)
(U.S. metric tapered thread), (British imperial tapered thread) – this question seems to have an issue; there are also tapered threads in the metric system
55° tooth profile angle, 60° tooth profile angle