Evening star., 1960-12-01
4 cuhieal permi,sihle dax.

Column No. . applies TO ap-
planes when located In areas
which have permanent openings
Of ut least Is "a. It. LEADING to-
another area Of equal or greater
euhieel content. ''column. No. ]
applies TO appliances when located
IN areas which do not leave perma-
nent openings to other areas. tkl
Water from . hot water supply
buiidins heating. u 4 tank
currently in use shan not be
painted. lined or repaired on the
inside with any material or IN any
manner that will affect either the
color or taste Of the water supply
after the tank Is put into service.
ANY material intended for use asI
lining or protective eoattng for
the interior Of tanks shall be sub
mitted for approval and II found
acceptable, may then be used. The
water supply connections TO and
from the tank shall be discor-
neeisds s.sn o. IluGssSd Tnils na,n,. ne tank tsns
or repaired. 70 prevent any foreign
fiuid OF substance from entering
the distribution piping. Adequate
protection Of Wofkinen IN the tank.
lml ANY repair By Welding on n
tank shall be done By q Weider
alfaliiied and licensed By the De-
partment and the work shall be
done under the supervision of AI
D. c. Boiler Inspector or an in
suranee company tnspector. (nl
When any changes or additionsI
are made to an, existing hot waterl
ts tank Is R sspiassd Or moved; ccm.I
Tegulations shall be tSeapired. (o)
Water heaters shalt mot be in
rooms used ior Sleepins purposes.
They shall be aecessible for clean
sTRucTfoN AND KsrAGLATioN
-tal Each hydfo-pne0matic tank
shall be constructed for . mimi
mkm wcrkine pressure ] Of 2. 160I
pounds. Der saunre inch. Each
tank shall be stamped With the
AsME symbol 70 indicate that i
the uniired Pressure Vessel Code
Of the American Society Of Me-
be stamped with the name Of the
Manufacture. the maximum al
lowahle working pressure, the year
built, and the identifying number
Of the National Board of Boiler
and Pressure Vessel Inspectors.
Applications for permits shall be
accompanied by the Manufacturers
Data Report which shall be signed
boilers ana pressure vessls by the
National Board. lbl.. Each hydro
pneumatic tank shall be provided
with Q gage-Elass TO show the
level Of the water in the upper
section Of the tank and o pressure
gage. It shall also be provided
with an II inch 1b inch man.
hole opening which shall be kept
clear Of all walls, pine or other
ohstructions., tel Each tank shan
safety valve bearing ''tf he ss AsME
symbol suitable for use with air
the tor Of the tank and SET 70
relieve. at or below the maximum
allowable working pressure OF the
tank. The valve shall be sealed
70 prevent, tampering and there
shall not be any shut-oh valve
between the tank and the relief
valve. I'D Each tank shall be pro-
than 4 inches in diameter con.
nected directly 30 the tank by
means OF non-ferrous pipe. A
cock with tee handle shall be
placed in the pipe near the gage
The gage shall be graduated to
not less than M times the maxi
mum allowable working pressure
Of the tank. te) Each hydro
pneumatic tank shall be piped to
include 0 fuli-size. Waived bypass
In the building when the tank
Is not in service. C) Each hydro
pneumatic tank shall be provided
with 2 vacuum relieving device
located on the top of the tank
and o horizontal swing check
valve in the water. supply line
from the pump to the tank, and
In the. District water supply by
pass line to the tank. A waived
siudge drain pipe shah be installed
shall discharge through an open
connection into the drainage sys-
tenn Of the building. l31 Relief
Valves. Cages and Safety Controls
--tD Each hot water storage
tank. range boiler. and automatic
water heater shall be equipped
with safety controls, which shall
prevent the temperature in the
tank from exceeding 2l0oF and
sne pressure from exceeding the
sure for which the tank is built
Each such unit shall be equipped
with: ID A pressure relief valve
and Q separate temperature relief
valve Of the spillaee type, or I2l |
a combined temperature Or essiire
rehei valve OF the spillage type,
OF l3) In. the case of automatic
whher neaters manufactured as a
unit, Q thermostat and pressure
i rei,ef n.,n. va,ive. q, Each pressure
lifting. sprinR-i LOADED type without
disk guides on the pressure side
OF the valve. The valves shall be |
sei 10 relieve at q pressure at or
below the maximum allowable
WORKING pressure OF the tank and
SO arranged that they cannot be
reset 70 relieve at a higher pres
s sure than stamped thereon. 1c)
snss Ins wave or valves shall have
pressure in the tank from risins
more than 10 per cent above the
maximum allowable working pres
sure. The rated capacity Of the
yalve. or valves shall be equal to
Sne maximum Rross OUTPUT OF the
neatlng element installed. The
gross output shall be determined
from the data supplied on the
manuIacturers name plate, cataioe
9ata or from the fuel input. ld9
PRESSURE relief valves shall bear
tne ASME symbol TO Indicate that
tney comply with the reuuirements
q the ASME Low Pressure HeatinS
5oiler Code In regard TO construc-
Sion, testing and rating, and shall
pe plainly and permanently marked
BY the manufacturer in such a
way that the marking will be
readable when the valve ia IN.
stalled and will not be obliterated
n service. The marking shall in
clude the manufacturers name
tne type and catalog number. the
pressure at which 1t is set to blow,
and the capacity In pounds Of
steam or BTU per hour as certi.
ned by the National Board of
Boiler and Pressure Vessel In.
spectoIs. No valve shall he less
than inch. standard pine size
Pressure relief valves used on non.
ment shall bear the AGA symbol
20 indicate listing under the latest
AGA requirements and shall hesr
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