[HISTORY: Adopted by the Council of the City of Mount Vernon 4-19-1976, approved 4-19-1976. Amendments
noted where applicable.]
GENERAL REFERENCES
Fire prevention — See Ch. 131.
A.
All liquefied petroleum gases shall be effectively odorized by an
approved agent of such character as to indicate positively by distinct
odor the presence of gas down to concentration in air of not over
1/5 the lower limit of flammability. [NOTE: The lower flammable limits
of the more commonly used liquefied petroleum gases are: propane,
2.15%; butane, 1.55%. These figures represent volumetric percentages
of gas in gas-air mixtures.]
B.
The odorization requirement of Subsection A shall be considered to be met by the use of 1.0 pounds of ethyl mercaptan, 1.0 pounds of thiophane or 1.4 pounds of amyl mercaptan per 10,000 gallons of liquefied petroleum gas. However, this listing of odorants and quantities shall not exclude the use of other odorants that meet the odorization requirements of Subsection A of this section.
A.
Each system utilizing Interstate Commerce Commission containers shall
have its container valves, connectors, manifold valve assemblies and
regulators (bases, hoods or cabinets), if desired, listed by Underwriters'
Laboratories, Inc., or listed by a nationally recognized testing laboratory.
[NOTE: Regulations of the United States Interstate Commerce Commission
outline specifications for transportation of explosives and dangerous
articles (Code of Federal Regulations, Title 49, Parts 171 through
190) and are available from the Government Printing Office, Washington,
D.C., or from the Association of American Railroads, Bureau of Explosives,
2 Pennsylvania Plaza, Room 2177, 7th Avenue and West 33rd Street,
New York, New York, or the American Trucking Association, Inc., 1616
P Street, Washington, D.C. In Canada, the regulations of the Board
of Transport Commissioners for Canada apply and are available from
BTC, Union Station, Ottawa, Ontario.]
B.
Each system for domestic or commercial use utilizing containers of
2,000 gallons' or less water capacity, other than those constructed
in accordance with Interstate Commerce Commission specifications,
shall consist of a container assembly and one or more regulators and
may include other parts. The system as a unit or the container assembly
as a unit and the regulator or regulators shall be individually listed
by Underwriters' Laboratories, Inc., or listed by a nationally
recognized testing laboratory. (NOTE: Where necessary to alter or
to repair such listed system in the field in order to provide for
different operating pressures, change from vapor to liquid withdrawal
and the like, such changes may be made by use of component parts which
have been individually listed by one of the above for use with liquefied
petroleum gas.)
C.
In systems utilizing containers of over 2,000 gallons' water
capacity, each regulator, container, valve, excess flow valve, gauging
device and relief valve installed on or at the container shall have
its correctness as to design, construction and performance determined
by listing by Underwriters' Laboratories, Inc., or listing by
a nationally recognized testing laboratory.
A.
Welding to the shell, head or any part of the container subject to
internal pressure shall be done in compliance with the code under
which the tank was fabricated. Other welding is permitted only on
saddle plates, lugs or brackets attached to the container by the tank
manufacturer.
B.
Where repair or modification involving welding of Interstate Commerce
Commission containers is required, the container shall be returned
to a qualified manufacturer making containers of the same type, and
the repair or modification shall be made in compliance with Interstate
Commerce Commission regulations. [NOTE: Regulations of the United
States Interstate Commerce Commission outline specifications for transportation
of explosives and dangerous articles (Code of Federal Regulations,
Title 49, Parts 171 through 190) and are available from the Government
Printing Office, Washington, D.C., or from the Association of American
Railroads, Bureau of Explosives, 2 Pennsylvania Plaza, Room 2177,
7th Avenue and West 33rd Street, New York, New York, or the American
Trucking Association, Inc., 1616 P Street, Washington, D.C. In Canada,
the regulations of the Board of Transport Commissioners for Canada
apply and are available from BTC, Union Station, Ottawa, Ontario.]
A.
Each container shall be marked as specified in the following:
(1)
With a marking identifying compliance with and other markings required
by the rules of the code under which the container is constructed
or with the stamp and other markings required by the National Board
of Boiler and Pressure Vessel Inspectors.
(2)
With a notation as to whether the container is designed for underground
or aboveground installation, or both. If intended for both and different
style hoods are provided, the marking shall indicate the proper hood
for each type of installation.
(3)
With the name and address of the supplier of the container or with
the trade name of the container.
(4)
With the water capacity of the container in pounds or gallons, United
States standard.
(5)
With the pressure in pounds per square inch gauge for which the container
is designed.
(6)
With the rare weight in pounds or other identified unit of weight
for containers with a water capacity of 300 pounds or less.
(7)
With marking indicating the maximum level to which the container
may be filled with liquid at temperatures between 20° F. and 130°
F., except on containers provided with fixed maximum level indicators
or which are filled by weighing. Markings shall be in increments of
not more than 20° F. This marking may be located on a liquid level
gauging device.
(8)
With the outside surface area in square feet.
B.
Markings specified shall be on a metal nameplate attached to the
container and located in such a manner as to remain visible.
C.
When liquefied petroleum gas and one or more other gases are stored
or used in the same area, the containers shall be in compliance with
U.S.A. Standard Z48.1-1954, Method of Marking Portable Compressed
Gas Containers to Identify the Material Contained.
A.
Each individual container shall be located with respect to the nearest
building or group of buildings or lot line of adjoining property which
may be built upon in accordance with Table 1:
|
Table 1
| ||||
|---|---|---|---|---|
|
Minimum Distances
| ||||
|
Water Capacity per Container
(gallons)
|
Underground Containers
(feet)
|
Aboveground Containers
(feet)
|
Between Aboveground Containers
(feet)
| |
|
Less than 125
|
10
|
None
|
None
| |
|
125 to 250
|
10
|
10
|
None
| |
|
251 to 500
|
10
|
10
|
3
| |
|
501 to 2,000
|
25
|
25
|
3
| |
|
2,001 to 30,000
|
50
|
50
|
5
| |
|
30,001 to 70,000
|
50
|
75
|
1/4 of sum of diameters
| |
|
70,001 to 90,000
|
50
|
100
|
Adjacent containers
| |
|
If the aggregate water capacity of a multicontainer installation
at a consumer site is 501 gallons or greater, the minimum distance
shall comply with the appropriate portion of this table, applying
the aggregate capacity rather than the capacity per container. If
more than one installation is made, each installation shall be separated
from another installation by at least 25 feet. Do not apply the minimum
distances between aboveground containers to such installations. [NOTE:
The above distance requirements may be reduced to not less than 10
feet for a single container of 1,200 gallons' water capacity
or less, provided that such a container is at least 25 feet from any
other liquefied petroleum gas container of more than 125 gallons'
water capacity.]
|
B.
Containers installed for use shall not be stacked one above the other.
C.
In cases of bulk storage in heavily populated or congested areas,
the authority having jurisdiction shall determine restrictions of
individual tank capacity, total storage and distance to line of adjoining
property which may be built upon and other reasonable protective methods.
[NOTE: Generally, aggregate storage of 2,000 gallons' water capacity
or more is considered bulk storage.]
D.
In industrial installations involving containers of 180,000 gallons'
aggregate water capacity or more, where serious mutual exposures between
the container and adjacent properties prevail, the authority having
jurisdiction may require fire walls or other means of special protection
designed and constructed in accordance with good engineering practices.
E.
In the case of buildings devoted exclusively to gas manufacturing
and distributing operations, the above distances may be reduced, provided
that in no case shall containers of a water capacity exceeding 500
gallons be located closer than 10 feet to such gas manufacturing and
distributing buildings.
F.
Readily ignitable material, such as weeds and long dry grass, shall
be removed within 10 feet of any container.
G.
The minimum separation between liquefied petroleum gas containers
and flammable liquid tanks shall be 20 feet, and the minimum separation
between a container and the center line of the dike shall be 10 feet.
The foregoing provision shall not apply when liquefied petroleum gas
containers of 125 gallons' or less capacity are installed adjacent
to Class III flammable liquid tanks of 275 gallons' or less capacity.
H.
Suitable means shall be taken to prevent the accumulation of flammable
liquids under adjacent liquefied petroleum gas containers, such as
by diking, diversion curbs or grading.
I.
When dikes are used with flammable liquid tanks, no liquefied petroleum
gas containers shall be located within the diked area.
