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Poly pitot/static lines.

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dean.psiropoulos(at)veriz
Guest

Posted: Sun Apr 01, 2007 9:24 pm Post subject: Poly pitot/static lines.

Question on those plastic fittings that screw into the back of airspeed,

altimeter, etc to connect pitot and static lines.  I'm using the paraflex

that came with Van's static port kit but I'm wondering about how much torque

to put on the fittings to get them to seal properly.  I've installed the

fittings into the back of the Dynon EFIS and tightend them as tight as I

could by hand then put a wrench on them for about another quarter turn. I

figure that there is already A LOT of threads into the brass female fitting

and I didn't want to strip the threads in the plastic fitting.  Is an extra

quarter turn enough?  Is there a spec for tightening these types of

fittings? Please advise.



Also the paraflex (plastic/nylon) tubing that goes into these fittings,

after you hand tighten the nut enough so that the ferrule grips the tubing,

how much more should you tighten to ensure a good seal?  Does this tubing

require the little inserts that go into the ends (of the tubing) in order

make a good seal or can it be achieved without them (these inserts did NOT

come with fittings I ordered from Gulf Coast avionics)?  Thanks.



Dean Psiropoulos

RV-6A  N197DM

Last details before windshield and prop.

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jim jewell

Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada

Posted: Mon Apr 02, 2007 12:23 am Post subject: Poly pitot/static lines.

Hello Dean,



Google   SMC fittings  To view alternative fittings.

They cost a bit more But I think their system is a good alternative choice.



Jim in Kelowna - 1.3 hr

---

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"I never make mistreaks"

rv8iator

Joined: 11 Apr 2006
Posts: 144
Location: Newberg, OR

Posted: Mon Apr 02, 2007 5:43 am Post subject: Poly pitot/static lines.

Dean...



Used these in first RV-8.  Still waiting for first flight next month.



I use this tubing and these connectors at work to test our products.  Typically hand tighten and then 1/4 turn for final snug.  I am pressurizing these connections to 100 - 200 psi.  No leaks.



All my tubing is Parker Parflex polypropelene.  (The same stuff Van's sells) Fittings are Parker nylon w/O-ring, stainless steel grasp ring and nut.



Chris

RV-8 x 2

 	  Quote: 	
		  




Question on those plastic fittings that screw into the back of airspeed,

altimeter, etc to connect pitot and static lines.  I'm using the paraflex

that came with Van's static port kit but I'm wondering about how much torque

to put on the fittings to get them to seal properly.  I've installed the

fittings into the back of the Dynon EFIS and tightend them as tight as I

could by hand then put a wrench on them for about another quarter turn. I

figure that there is already A LOT of threads into the brass female fitting

and I didn't want to strip the threads in the plastic fitting.  Is an extra

quarter turn enough?  Is there a spec for tightening these types of

fittings? Please advise.



Also the paraflex (plastic/nylon) tubing that goes into these fittings,

after you hand tighten the nut enough so that the ferrule grips the tubing,

how much more should you tighten to ensure a good seal?  Does this tubing

require the little inserts that go into the ends (of the tubing) in order

make a good seal or can it be achieved without them (these inserts did NOT

come with fittings I ordered from Gulf Coast avionics)?  Thanks.



Dean Psiropoulos

RV-6A  N197DM

Last details before windshield and prop.

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
C. Stone (RV8iator)

mrobert569(at)hotmail.com
Guest

Posted: Mon Apr 02, 2007 9:47 am Post subject: Poly pitot/static lines.

Dean,

  

 

With the plastic fittings what you have described for the tightening should be good.  hand tigh with about another 1/4 turn with the wrench.  You will find out if they leak when you do the pitot static test . 

  

 Good to hear from you.  How close are you to being done?

  

 Mike Robertson



   

 > Date: Mon, 2 Apr 2007 01:23:11 -0400

 	  Quote: 	
		   From: dean.psiropoulos(at)verizon.net

 Subject: Poly pitot/static lines.

 To: rv-list(at)matronics.com

 

 --> RV-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net>

 

 Question on those plastic fittings that screw into the back of airspeed,

 altimeter, etc to connect pitot and static lines. I'm using the paraflex

 that came with Van's static port kit but I'm wondering about how much torque

 to put on the fittings to get them to seal properly. I've installed the

 fittings into the back of the Dynon EFIS and tightend them as tight as I

 could by hand then put a wrench on them for about another quarter turn. I

 figure that there is already A LOT of threads into the brass female fitting

 and I didn't want to strip the threads in the plastic fitting. Is an extra

 quarter turn enough? Is there a spec for tightening these types of

 fittings? Please advise.

 

 Also the paraflex (plastic/nylon) tubing that goes into these fittings,

 after you hand tighten the nut enough so that the ferrule grips the tubing,

 how much more should you tighten to ensure a good seal? Does this tubing

 require the little inserts that go into the ends (of the tubing) in order

 make a good seal or can it be achieved without them (these inserts did NOT

 come with fittings I ordered from Gulf Coast avionics)? Thanks.

 

 Dean Psiropoulos

 RV-6A N197DM

 Last details before windshield and prop.

&========================> 
	


 	  Quote: 	
		   

 


	


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