Compression fittings and Tubing

Sierra Hotel

New Member

Joined

May 17, 2010

• May 17, 2010

• #1

Hi All,

Long time reader, first time poster.

I've acquired some Bitspower G1/4" Compression Fittings; ID 1/2" with OD 3/4"

The tubing I have however is Swiftech 7/16" by 3/8" tube from memory.

Are these two compatible. I know I'll have to soap up or heaten up the tube to get the tube on the compression ring; however I cant find much infrmation about users using this tubing with these fittings?

Must I go for 1/2" ID 3/8" tubing for these fittings?

 

Conumdrum

Member

​

Joined

Sep 15, 2007

Location

Small town Emlenton, PA

• May 17, 2010

• #2

Not at all. Compression fittings ID and OD must match EXACTLY with the tubing ID nad OD.

EXACTLY. You want to use the comp fittings you need to buy 1/2 3/4 tubing.

Sorry.

The G1/4 is just the thread size.........

 

OP

Sierra Hotel

New Member

Joined

May 17, 2010

• May 17, 2010

• Thread Starter
• #3

I can fit the tube without a problem though it is tight.
I'm interested now exactly what the Swiftech barbs ID is. I assume it's 3/8".

Hmm; in theory matching tube ID to tube ID makes perfect sense to prevent flow restrictions. Guess I'll have to order some 1/2" OD 3/4"ID tubing then. Off to FrozenCPU I go..

 

Conumdrum

Member

​

Joined

Sep 15, 2007

Location

Small town Emlenton, PA

• May 17, 2010

• #4

Compression fittings MUST have the same ID and OD as the tubing. Nuff said, good luck, look at Primochill LRT, good stuff.

 

OP

Sierra Hotel

New Member

Joined

May 17, 2010

• May 17, 2010

• Thread Starter
• #5

Conumdrum said:

Compression fittings MUST have the same ID and OD as the tubing. Nuff said, good luck, look at Primochill LRT, good stuff.

Click to expand...

Can you explain why they 'must' be the same. Is this due to the compression ring, or flow factor ?

 

Albaholic

Member

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Joined

Sep 5, 2001

• May 17, 2010

• #6

If they don't match.. It will leak or the fitting can cut into the tubing

 

OP

Sierra Hotel

New Member

Joined

May 17, 2010

• May 17, 2010

• Thread Starter
• #7

Hmm I see, thank you.

 

Spawn-Inc

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Joined

Jun 13, 2007

• May 17, 2010

• #8

the internal diameters must match as well as the outside diameters because the locking of the tubing into the fitting is dependent on that. they are manufactured so the outer ring can push on the tubing into the inner barb and clamp it tight.

so if you put 1/2 " ID x 5/8" OD tubing with your compressions the thinner tubing won't be pushed into the inner barb to clamp it. so you could just pull it out.