Trane Two Pipe Main Venting

Ray M

Ok i will look monday. I quess you have not seen this one?



Thanks

Ray M

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adayton

Main Steam Venting AND Return Condensate \"Trap\"

I havae been troubleshooting and cleaning/repairing a Trane two pipe system. The mains at the tail end of each of two runs have unidentified "vents". I would like to replace them with Hoffman #75 OR 75H wents. the first is listed as for 3PSI, and the 75H is for 10PSI. This is a 5 section Trane steam boiler runing now at 4.5psi down to .5psi on the pressuretrol.(had been operating from 8 to 12 PSI). The piping is sized fine. My first question is which vent to use, the 3 or the 10 PSI??? The second issue is a large canister located at end of the return that has a triggered 5 inch diameter float inside. That is, as water (condensate) accumulates inside the float rises and at some point SLAPS closed a pin that stops further incoming water for a short duration of time until the ammassed water level drops thereby SLAPPING the pin open so water can refill the chamber. I am guessing this device behaves as a simplified vacuum chamber. I have attached photos. I seek info regarding technical nature of this device. Third question is regarding radiator traps.. (I know, I said only two questions..:-) ),,Eack of the 15 radiators has its own ORIGINAL Trane trap. and they all are the bellows style and in perfect working order. only one had been changed out for the new diaphram style. Each trap has excelent looking (not worn) integral seats BUT most of the brass pins (valves) in each trap have SLIGHT half moon wear pattern and some have small pitting on the mating sealing area of the pin. Multiplied times 15 I ASSume some small ammounts of live steam is escaping to cumulatively roll down the return system. All radiators get hot fine. Question three is at what indication of wear/pitting should the pins/bellows unit be replaced. Trane does have repair replacement kits of the bellows/pin set ONLY not the case/integral seat. Thanks for your guidance and info. Adayton 631-928-2424 adayton@adayton.com Please cc: vomad13@aol.com

adayton

Main Steam Venting AND Return Condensate \"Trap\"

I havae been troubleshooting and cleaning/repairing a Trane two pipe system. The mains at the tail end of each of two runs have unidentified "vents". I would like to replace them with Hoffman #75 OR 75H wents. the first is listed as for 3PSI, and the 75H is for 10PSI. This is a 5 section Trane steam boiler runing now at 4.5psi down to .5psi on the pressuretrol.(had been operating from 8 to 12 PSI). The piping is sized fine. My first question is which vent to use, the 3 or the 10 PSI??? The second issue is a large canister located at end of the return that has a triggered 5 inch diameter float inside. That is, as water (condensate) accumulates inside the float rises and at some point SLAPS closed a pin that stops further incoming water for a short duration of time until the ammassed water level drops thereby SLAPPING the pin open so water can refill the chamber. I am guessing this device behaves as a simplified vacuum chamber. I have attached photos. I seek info regarding technical nature of this device. Third question is regarding radiator traps.. (I know, I said only two questions..:-) ),,Eack of the 15 radiators has its own ORIGINAL Trane trap. and they all are the bellows style and in perfect working order. only one had been changed out for the new diaphram style. Each trap has excelent looking (not worn) integral seats BUT most of the brass pins (valves) in each trap have SLIGHT half moon wear pattern and some have small pitting on the mating sealing area of the pin. Multiplied times 15 I ASSume some small ammounts of live steam is escaping to cumulatively roll down the return system. All radiators get hot fine. Question three is at what indication of wear/pitting should the pins/bellows unit be replaced. Trane does have repair replacement kits of the bellows/pin set ONLY not the case/integral seat. Thanks for your guidance and info. Adayton 631-928-2424 adayton@adayton.com Please cc: vomad13@aol.com

gerry gill

i'm willing to bet

that your system was supposed to be running in ounces and not pounds...

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Ray M

trane

The last vapor system we worked on had this huge marsh main vent. We replaced it with 3 Gorton #2's and it works fine. I dont think the Hoffman 75 is not a good choice.

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gerry gill

ray, did you save that vent?

i'd like to test its capacity if you still have it.

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Ray M

I have been asked by several people for that main vent. It is cira 1904 original to the house. I think it's in my shop i will check on monday.

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Steamhead (in transit)

That's a classic Trane Vapor System

we have tons of these systems here in Baltimore.

The unidentified vents are Trane vacuum vents. You will find the name on the underside, encircling the pipe connection. Their capacity is roughly equal to the Hoffman #75 or 76 vent. But you want to go larger, since the original vents were sized for coal firing. With oil or gas the steam comes up much quicker and can overwhelm these vents. You'll probably end up using at least one Gorton #2 on each. Measure the length and diameter of each steam main so we can tell you how to vent it. For the dry return, one Gorton #2 will be fine. Forget the Hoffmans, they're too small for the way the system is now operated.

Turn the pressure control down as low as it will go. The Direct Return Trap (canister with float inside) is there to overcome excessive boiler pressure, which you now have, and is doing its job of returning water to the boiler against the pressure. If you have a small gray pressure control with the "cut-in" scale in front, turn that down to 0.5. Then turn off the power, remove the cover and you will see a small white wheel (newer version) or steel wheel (older) with numbers on it. Turn this all the way down to the number 1. This will stop the burner at 1.5 pounds and restart it at 0.5 pounds.

The measure of a trap is whether it closes tightly when steam hits it, and opens to let air and water pass. Some wear on the pins is not that big a deal, but if the bellows fails you definitely need a new element. If the traps have never been serviced, it might make sense to replace all the elements. They're all the same age and will probably all fail at about the same time.

Once you get this system restored, it will give years of efficient, trouble-free comfort.

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gerry gill

I don't want to keep it..

i'd send it back..it would be nice to test it and add it to the next edition of the venting capacity charts..i've found some more items around cleveland, steamheads sending some from baltimore and john shea has sent some more from detroit..charts expanding rapidly with everyones help.

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gerry gill

no, the more modern

trane vents the only one i've tested thus far, and that was sent from john shea from detroit..

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