Plastic barbs - teflon tape?

JSimmons · 04-19-2003, 05:16 AM

Do I need to put teflon tape on pastic barbs that are threaded into a plastic fitting on a water pump?

murray13 · 04-19-2003, 05:45 AM

I do just to be sure. Some might say no, or to use something else but I think yes you do.

jtroutma · 04-20-2003, 01:00 PM

Yes, plastic is softer and will conform more than a metal one but unless you screw it in sooo tight that the two surfaces litteraly almost bond together, there is still a possiblility of leakage.

Do you really want to take that chance?

Mark Larson · 04-20-2003, 07:58 PM

In the vein of "bonding", could you heat up the copper just enough so the nylon/plastic that touches the copper melts and spreads? Wouldn't this be the most effective method of sealing?

JSimmons · 04-20-2003, 08:10 PM

Well, I'm asking because I didn't see anything mentioned in the instructions to my waterpump about using any kind of thread sealer (of course I may have missed it).

I'll be using plastic barbs on the plastic fittings on the pump.

I'll be using teflon tape.

bigben2k · 04-20-2003, 08:24 PM

Quote:

Originally posted by JSimmons
Do I need to put teflon tape on pastic barbs that are threaded into a plastic fitting on a water pump?

My pump manual recomends it, and I use it.

It also makes it easier to remove, afterwards.

Some thread sealers can eat the plastic, so you have to choose it carefully.

Strafe · 04-20-2003, 09:44 PM

I installed sprinklers for several summers and we always used teflon on poly fittings (on the manifolds anyway).

Pug · 04-21-2003, 01:05 PM

You only need to put teflon tape on taper fittings.
These seal on the thread surface, so the tape helps form the seal.

If your fittings are parallel (or straight), they normally seal on the face by means of an O-ring and have no need of teflon tape.

Eheim pumps, for example, use a parallel thread and do not require teflon tape or sealant.
They seal by the O-ring supplied.

04-19-2003, 05:16 AM	#1
JSimmons Cooling Savant Join Date: Apr 2003 Location: 4-sided room with an exit going east, and an exit going south Posts: 392	Plastic barbs - teflon tape? Do I need to put teflon tape on pastic barbs that are threaded into a plastic fitting on a water pump?

04-20-2003, 01:00 PM	#3
jtroutma Cooling Savant Join Date: Aug 2001 Location: SLO, CA Posts: 837	Yes, plastic is softer and will conform more than a metal one but unless you screw it in sooo tight that the two surfaces litteraly almost bond together, there is still a possiblility of leakage. Do you really want to take that chance? __________________ Athlon64 X2 4200+ @ 2.5Ghz (250FSB x 10) OCZ VX 1GB 4000 @ 250FSB (6-2-2-2 timmings) DFI LANParty nForce4 Ultra-D SCSI Raid 5 x (3) Cheetah 15K HDDs LSI Express 500 (128MB cache) OCZ PowerStream 520W PSU ATI X850XT PE (Stock) DTEK WhiteWater + DTEK Custom Radiator Eheim 1250

04-20-2003, 07:58 PM	#4
Mark Larson Cooling Neophyte Join Date: Feb 2003 Location: MN Posts: 67	In the vein of "bonding", could you heat up the copper just enough so the nylon/plastic that touches the copper melts and spreads? Wouldn't this be the most effective method of sealing? __________________ AMD Fanboy.

04-19-2003, 05:45 AM	#2
murray13 Cooling Savant Join Date: Sep 2002 Location: Omaha, NE USA Posts: 216	I do just to be sure. Some might say no, or to use something else but I think yes you do.

04-20-2003, 08:10 PM	#5
JSimmons Cooling Savant Join Date: Apr 2003 Location: 4-sided room with an exit going east, and an exit going south Posts: 392	Well, I'm asking because I didn't see anything mentioned in the instructions to my waterpump about using any kind of thread sealer (of course I may have missed it). I'll be using plastic barbs on the plastic fittings on the pump. I'll be using teflon tape.

04-20-2003, 09:44 PM	#7
Strafe Cooling Neophyte Join Date: Sep 2001 Location: Chiba City Posts: 62	I installed sprinklers for several summers and we always used teflon on poly fittings (on the manifolds anyway).

04-21-2003, 01:05 PM	#8
Pug Cooling Neophyte Join Date: Jun 2002 Location: UK Posts: 80	You only need to put teflon tape on taper fittings. These seal on the thread surface, so the tape helps form the seal. If your fittings are parallel (or straight), they normally seal on the face by means of an O-ring and have no need of teflon tape. Eheim pumps, for example, use a parallel thread and do not require teflon tape or sealant. They seal by the O-ring supplied.

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