Re: [ST] female quick disconnect failure (revisit)

[Frederic NIZERY <frederic.nizery@xxxxxxxxxxxxxxxxx>]

Hi Mike

Thanks for the reply.
Comments inside.

>>After further digging: mcmaster.com part number 5478K51 is the NPT
>>version with shut off. They have them in stock, and are easy to buy from
>>with a credit card. 
Triumph fitting is PSPT and the thread is different.

>>I'm not familiar with the specifics of the installation. What does this
>>fitting screw into? 

Into the metal plate the olds the fuel pump and the fuel filter on the tank.

>>You might be able to use the NPT thread as a direct interchange if the
>>part being screwed into is fairly thick walled polyethylene. If in
>>doubt, a quick and careful chase with a 1/4" NPT tap (Make sure you
>>collect ALL of the shavings!) will modify the hole to accept the
>>fitting. 

I just have normal cylindrical iso taps.

>>The problem with this part is that the
>>N(ational)P(ipe)T(apered) thread form specifies a (if memory serves)
>>3/4" per foot taper of the major diameter of the thread while the
>>B(ritish)S(traight)P(ipe) thread form is as the name implies, not
>>tapered. 

NPT is 18 thread step per inch while BSPT is 19 for 1/4 fitting. They are both conical.

>>Depending on the "fit" or "class" of the female thread, the material of
>>the female threaded part, and sometimes the phase of the moon, the NPT
>>male thread will work just fine. If the female threaded part is made of
>>a brittle material like nylon or PVC there is a danger of cracking the
>>part when the brass NPT fitting is screwed in. Problems can also crop up
>>if the female part is metal; the NPT part might not screw in far enough
>>to make room for the other half of the coupler, and its attached hose
>>(tube). 
>>Sorry guys, slow Monday morning for a change....
>>My latent fastenerd is showing through.

In addition the coupling must have apparently viton o-ring and not buna-n for non leaded fuel.

I found also 
http://photos1.blogger.com/blogger/7060/1458/1600/Omega%20Fuel%20Fittings2.0.jpg
which is comming from 
http://www.omega.com/pdf/tubing/couplings/ft-lcseries/ft-lcseries.asp

And apparently the omega matching ref is FT-LCD100-04BS while colder is LCD10004BPST 
Viton o-ring should be specified.

I contacted a guy at quickcoupling.net
He said that would be a 5+5 days shipping. That is 10 days to France.
I am waiting for the reply from Omega.

Omega has an online store in UK but as they show a 1 week delay while the US site shows "in stock",
I figured out they forward the order to US.

Lucky you are not to broke yours. Mine just broke after 4 years and half, and I am stuck taking the bus.

Fred ST 02 BRG



_______________________________________________
Triumph Sprint ST/RS mailing list
Send list posts to ST@xxxxxxxxxxxxxx
Change your list options at www.Triumphnet.com