Red Rubber Flange Gasket vs round gaskets

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Old 04-25-13, 07:12 AM
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Red Rubber Flange Gasket vs round gaskets

Hi all!

Since I will be draining my hydronic system this summer I want to reverse the direction of the system water. So I will be rotating my Taco 007 pump.

I will replace the flange gaskets since the existing ones that are there (red rubber gasket kind) is super old and crumbly.

Are there any pros/cons for red rubber vs round gaskets?

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Old 04-25-13, 09:52 AM
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I like full flange,sometimes put on both when not in a hurry.
 
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Old 04-25-13, 03:25 PM
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Are there any pros/cons for red rubber vs round gaskets?
Red rubber as you have noticed can tend to dry out and crack/crumble... but probably won't happen for many, many years. They're fine.

The round ones are usually Neoprene (or something like that), and may stay flexible for longer time.

You don't want to use the round ones unless there is a groove machined into the pump for the purpose of locating the ring. If you try to use the round ones on flat face flanges you won't be a happy camper.

Whatever you use, be sure to keep an eye on the flanges for the first season and 'snug' them back up if you notice any weeping. Don't gorilla the new ones tight right off the bat. Tight enough so they don't leak and then a little more.
 
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Old 04-25-13, 05:11 PM
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As Trooper wrote, if the pump has a groove for a ring (most smaller pumps do) then use a round ring-type gasket. Most are flat but you can use an O-ring if you can find the correct size. Definitely do NOT use a flat gasket on a pump with a gasket groove.

Red rubber is really for cold water service, if you do have flat faces on both the pump and the flanges use either a compressed fiber gasket material or black, cloth-inserted rubber gasket material to make your own.
 
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Old 04-25-13, 05:39 PM
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OP indicated 007 (taco).
Seen all ages of Taco circs, never seen one with no grooves machined in.
I would say use the proper TACO gasket if you need to replace them.
 
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Old 04-25-13, 07:15 PM
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Am I missing something here. If you flip t he pump a round. Are you flowing water through the boiler backwards.
My vote is for the round ones.
 
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Old 04-26-13, 04:35 AM
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Would it be less susceptible to flue gas condensation if the flow was reversed thru the boiler ?
Hottest water near the flame, with the cooler water near the top.
Maybe it would be more susceptible to condensation
 
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Old 04-26-13, 05:52 AM
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rbeck, it would be reversed. right now the return it pumped in to the boiler on the lower end of the exchanger.

so if it's reversed the colder return would enter the exchanger at the top. i would expect the bottom of the exchanger would be the hottest, no?

maybe i didn't think this thru
 
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Old 04-26-13, 06:24 AM
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You don't want to reverse the flow through the boiler under any circumstances...
 
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Old 04-26-13, 07:17 AM
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ok, scrape my question then. thanks for preventing the disaster!
 
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Old 04-26-13, 09:13 AM
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here are the pics, by the way.

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