Hoffman Steam traps and vents

[Deleted User]

have a simular problem two pipe system where end of main ties into return cross over trap above-installed a vapor stat today has not run long but so far no hammering- I think our new boiler has a lower water line so the wet reurn may not be borderline wet in the next room

John Boyer

hoffman traps and vents

Residential house with steam heat. Customer complaint has water hammer and can hear running water on call for heat, seems to be centered on one riser feeding three radiators. At end of steam main there is cross over 1/2 inch to dry return with 17A thermostatic trap. One radiator is one floor above boiler the other 2 are 2 floors above boiler.
Radiator on first floor above had hoffman 17c trap positioned at 2 o'clock is this okay or must it be straight up and down.
System is hoffman differential loop No. 0, should we be using a vapor stat to control system.?
Can we get replacement elements for hoffman 17A, 17C, and 18.
The end of dry return has a hoffman #75 vent, is this enough venting or do we need more.

Jacob Myron_18

diferential loop system

The sloshing water and banging at the one riser is caused by water not being draind out of the riser piping or a connection between the stem supply side of the system and the return side of the system.

Typically all steam traps should be installed correctly.

Steam trap elements are availible for the traps listed.

The cross over of steam to the return piping can be caused by a bad elemet in the trap that is used to vent the air from the steam main.

If the boiler was replaced you may have a part of the return piping system exposed to the steam sisde of the system. This usually occurs at the end of the system where a return connects to the wet return part of the piping system. Some times the that connection becomes exposed to steam when the original boiler water level is lowered below the connections to the wet return.

The old vents to these systems had very large openings and vented enormous amounts of air quickly. If the Hoffman # 75 is two small you can can add another Hofmann 75 to the system or install a Gorton # 2.

You did not mention system pressure. System pressure should be well under 2PSIG. Many of these older system heated a building at 1/2 a pound steam pressure so I would try setting the system at at 1 Psig with a 4 )Z. differential.

jake

If more info is needed you can e-mail me.

Mad Dog_2

good to see you Sir Jacob

Mad Dog

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