My plumber explained to me why I need to have a vertical nipple with a
cap to catch particulates.
I would like to know how many of these traps I should set up? Just
one? A couple? Next to each valve? For each appliance?
Many thanks in advance,
As Paul posted, that has been my experience and how I have done
installs but.........in my house the furnace has one, the water water
& stove do not. Owned this house for 30 years & have had no problems
with any of the gas appliances.
I wonder if the "dirt leg", as Paul calls it, is ancient practice that
has no real value kinda like "air chambers" made of a foot or so of
I was told years ago that the "dirt leg" was really a "condensate
on 2/3/2009 12:21 AM (ET) Paul Franklin wrote the following:
I was told it was a condensate trap. If you put it before the valve, how
would you inspect or empty whatever it collected? Mine are after the
valve so I just have to shut off the valve to that appliance to check
the trap and not the whole house valve, or in my case, the valve on the
top of my propane tank.
I don't think they were ever intended to catch much water or debris but are
just a cheap, simple, extra bit of "just-in-case" insurance. It probably
would be worth it if it caught one tiny piece that could clog an orfice or
prevent a valve from seating.
It is probably not revelant but I once had an underground gas feeder that
collected enough water to cut off my supply. The gas company disconnected
the line and blew the water out. So I know it is possible for water to make
its way into gas lines.
ALL gas appliances require a drip leg at each appliance unless you
like to replace gas valves, regulators, etc. These are there to catch
oils, pipe dope, metal shavings, water and anything else that can get
into the gas piping supply.
Also, never use copper for natural gas lines. It causes the inside of
the copper to oxidize and flake off causing all kinds of particles to
go through the gas line.
Needing to replace appliances I have checked the dirt traps and never
found anything in them.........
gas company must be careful dirt might muck up meters, and their
although a broken underground water line can get water into gas lines
its occured around here.
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