Thread-seal interference
Thread-seal interference
(OP)
Hi All,
I'm currently in the process of reading an API guide on testing casing and tubing designs (which I don't have much experience of).
I've come across the term "thread-seal interference". From researching this term I found some very vague information regarding this.
From what I can gather, I believe it has to do with the way in which the threads interact and how they form seals properly. Is this correct? I would appreciate it if someone could point me in the correct direction or provide additional info, particularly with regards to the following definitions:
thread high - seal low
thread low - seal high
thread high - seal high
thread low - seal high
Thanks,
Jevons
I'm currently in the process of reading an API guide on testing casing and tubing designs (which I don't have much experience of).
I've come across the term "thread-seal interference". From researching this term I found some very vague information regarding this.
From what I can gather, I believe it has to do with the way in which the threads interact and how they form seals properly. Is this correct? I would appreciate it if someone could point me in the correct direction or provide additional info, particularly with regards to the following definitions:
thread high - seal low
thread low - seal high
thread high - seal high
thread low - seal high
Thanks,
Jevons





RE: Thread-seal interference
They are also called 'dryseal'.
There's a nominal thread interference (other than the taper).
It's a cosmic joke.
Mike Halloran
Pembroke Pines, FL, USA
RE: Thread-seal interference
RE: Thread-seal interference
RE: Thread-seal interference
API does not use NPT; it uses 8 round (and 10 round, and buttress), looks a lot like NPT. It requires API dope to seal , used to be full of lead, zinc, etc, but so many children were eating it, they had to take out the lead (25yr ago). And I forgot, 20 yr ago API reverse engineered the PH6 , old proprietary thread, and adopted it. I expect Hydril is still suing API.