The Lexington advertiser. [volume] (Lexington, Miss.) 1904-1985, 1947-09-11

difficulty. 1t will very rarely be
necessary to allow a trap in house
piping when first installed.
ID Safeguarding Trapped Piping
If no practical method for advoid-
ing a trap in piping is found, a tee
with a proper length nipple and cap
shall be provided at the lowest point
on the trapped portion to facilitate
removal of any condensed liquid.
Such drips shall be installed only
in such locations that the outlet of
the drip will be rapidly accessible
to permit cleaning or emptying. The
size of any drip used should be de-
termined by the capacity and the
exposure of the piping which drains
to it.
Passing Offsets in Walls
When the thickness of a wall has
been increased and it is necessary
to offset a vertical pipe, the offset
should not be made around the pro-
lection by the use of right angle
fittings, but should be made with
As degree fittings, in order to re-
duce the likelihood of stoppage.
When the point of offset is acces-
sible, as in the case of a founda~
ton wall. the upper fitting should
be a As degree ell and the lower a
As degree Y-bend. The branch of
the Y should be vertical, and the
lower s'run' opening should be plug
ged.
When the offset is not accessible,
or when there is a change in direc-
ton necessitating a plugged tee with
a short distance below offset fitting,
two AS degree fittings should be
used.
Painting or Covering
Piping exposed on the outside OF
buildings or in a damp location shall
be carefully cleaned after installa-
ton and painted with two coats
of pure red lead paint or covered
with other material equally effective
in preventing c~orrosion OF the metal.
Additional coats of paint should be
applied as often as necessary to pre-
vent rusting.
Note.-Pipe should not be coated
or painted until after the first IN
spection.
Protection Against Strains
Enclosed by cement, etc. : Where
piping is enclosed by or embedded
in cement, concrete or other struc-
tural materials not reinforced 1t
should be so placed as to avoid the
strains which may be induced by
settling or cracking of the structure
General Precautions
(a) Work with gas off.-Gas fltt-
ING appliance installation, and re-
pair work shall be done with the
oas turned off so that the danger
from leakage during the work will
be a minimum, except as PROVIDED
in paragraph co.. -,
(b) Working on pipes filled WIN
gas. : Work which involves removal
of an appliance or unscreWlng OF
a cap, plug or pipe which will open
an outlet and permit the escape
should never be done without smut
ing the gas off, except in emergency
cases where interruption OF the E
vic is impracticable. and unless n
work can be done without DANCE
to life and property with the gas OF
It is suggested that when workinl
on pipes filled with gas, outlets lar
J ger than rs inch size and pressure
in excess of 10 inches OF water o.
not handled except by a specialist
In any event the following precau
tons shall be observed:
"a Determine the location OF tn
meter cock or line cock by which
the gas supply to the proposed ope
ming is controlled and see thai
is in working order.
(2) Make sure that no fire o
flame or spark-emitting device Q
any kind is near enough to set fir
MMMWM nm