Engineers Edge
Pipe Threads Question
Post Reply   Engineering Forum
Posted by: glangri2

08/06/2003, 04:34:02

Author Profile
eMail author
Edit

I need to block the end of an aluminum tube (OD 20mm / ID 8mm). The tube is used in a fuel injection system, and so contains automotive gasoline.

I am thinking of using a 1/8-27 PTF SAE Short plug, and tapping the end of the tube with an NPSI thread to match. (0.3429 minor dia).

Does anyone have any thoughts on whether I am likely to see any sealing problems, when the fuel is at about 4 bar ?

Also, the only plugs I have available are zinc plated steel, which could cause me a galvanic corrosion issue - has any one got experience of the effect other plating materials have on seal performance ?

Gary














Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
View All   | Next |

Replies to this message

: Pipe Threads
: Pipe Threads -- glangri2 Post Reply Top of thread Engineering Forum
Posted by: shel

05/24/2009, 15:42:26

Author Profile
eMail author
Edit

according to sae J476a...you have to control the diameter of both the female and male...the female should be at the min and the male should be at the max....if this is a one time fix for a single project, you may have to use a sealant...i would not use something like that in production especially on hydraulics...hope this helps...













Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread |   |
Re: Pipe Threads
: Pipe Threads -- glangri2 Post Reply Top of thread Engineering Forum
Posted by: Ed Walklate

10/11/2006, 10:25:10

Author Profile
eMail author
Edit

Linked to your question, i'm having some issues of my own. Could you please advise on the metric or standard imperial equivalent of a 1/2" NPSI thread. Is there a standard conversion i can use?

Thanks














Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread | |
plugging a fuel rail end.
: Pipe Threads -- glangri2 Post Reply Top of thread Engineering Forum
Posted by: RKimball

08/16/2003, 20:07:32

Author Profile
eMail author
Edit

Well, I'd sure like to suggest a polyurethane plug. It will seal and not have a problem with the fuel to my knowledge.

Poly can be cut with a thread die and will compress and conform to the inside shape of the REAL size of your hole. I'd be amazed if it leaked.

-randy-











** The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, don't fail to listen to suggestions. -randy-


Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread | |
plugging a fuel rail end.
: plugging a fuel rail end. -- RKimball Post Reply Top of thread Engineering Forum
Posted by: RKimball

08/17/2003, 08:45:40

Author Profile
eMail author
Edit

I failed to mention that poly comes in different durometers. This is somewhat like hardnesses. You need a "hard" tough duro, a softer duro would be to mushy and push out.

-randy-











** The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, don't fail to listen to suggestions. -randy-

Modified by RKimball at Sun, Aug 17, 2003, 08:47:24


Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread |   |


© Copyright 2000 - 2018, by Engineers Edge, LLC All rights reserved.  Disclaimer