1) This Section applies to storage tanks for flammable liquids and combustible liquids.
1) Except as permitted in Sentence (3) and in Section 4.10., atmospheric storage tanks shall be built in conformance with the following:
a)API 12B, “Bolted Tanks for Storage of Production Liquids,”
b)API 12D, “Field Welded Tanks for Storage of Production Liquids,”
c)API 12F, “Shop Welded Tanks for Storage of Production Liquids,”
d)API 650, “Welded Steel Tanks for Oil Storage,”
e)ULC-S601, “Shop Fabricated Steel Aboveground Horizontal Tanks for Flammable and Combustible Liquids,”
f)CAN/ULC-S602, “Aboveground Steel Tanks for the Storage of Combustible Liquids Intended to be Used as Heating and/or Generator Fuels,”
g)ULC-S603, “Steel Underground Tanks for Flammable and Combustible Liquids,”
h)CAN/ULC-S603.1, “External Corrosion Protection Systems for Steel Underground Tanks for Flammable and Combustible Liquids,”
i)ULC-S615, “Reinforced Plastic Underground Tanks for Flammable and Combustible Liquids,”
j)ULC-S630, “Shop Fabricated Steel Aboveground Vertical Tanks for Flammable and Combustible Liquids,”
k)ULC-S643, “Shop Fabricated Steel Aboveground Utility Tanks for Flammable and Combustible Liquids,”
l)ULC-S652, “Tank Assemblies for Collection of Used Oil,”
m)ULC-S653, “Aboveground Steel Contained Tank Assemblies for Flammable and Combustible Liquids,”
n)ULC-S655, “Aboveground Protected Tank Assemblies for Flammable and Combustible Liquids,”or
o)ULC/ORD-C142.5, “Concrete Encased Steel Aboveground Tank Assemblies for Flammable and Combustible Liquids.”
2) Tanks built in conformance with Clauses (1)(a), (b) and (c) shall be used only for the storage of crude petroleum at oil fields.
3) When necessitated by possible contamination of the liquid to be stored or possible
rapid corrosion of the tank, storage tanks need not conform to Sentence (1), provided that they are designed and built in conformance with good engineering practice for the material being used.
4) Atmospheric storage tanks shall not be used for the storage of flammable liquids or combustible liquids at temperatures at or above their boiling points.
1) Low pressure storage tanks shall be constructed in conformance with
a)API 620, “Design and Construction of Large, Welded, Low-Pressure Storage Tanks,” or
b)ASME, “Boiler and Pressure Vessel Code.”
2) Pressure vessels shall be constructed in conformance with the British Columbia Safety Standards Act and pursuant regulations.
3) Low pressure storage tanks and pressure vessels are permitted to be used as atmospheric storage tanks.
1) The normal operating pressure of a storage tank shall not exceed its design pressure.
1) The exposed surface of every aboveground storage tank for flammable liquids or combustible liquids that is fabricated of any ferrous substance shall be thoroughly coated with a rust-resisting material that is compatible with the tank.
1) Except for perimeter sealing material, floating roof assemblies or internal floating
covers installed in storage tanks shall be constructed of metal or other materials and designed in conformance with one of the tank construction standards listed in this Subsection.
1) A storage tank and its filling and emptying connections shall be identified in conformance with CPPI, “Using the CPPI Colour-Symbol System to Mark Equipment and Vehicles for Product
Identification.”
1) A storage tank shall be prevented from being overfilled by providing
a)continuous supervision of the filling operations by personnel qualified to supervise such operations, or
b)an overfill protection device conforming to ULC/ORD-C58.15, “Overfill Protection Devices for Flammable Liquid Storage Tanks” (See Appendix A).
1) Unless otherwise specified in this Code, a storage tank shall be installed and used in conformance with the applicable installation and use provisions of the design document to which the storage tank was built as required by this Section.
1) A storage tank that has been taken out of service shall not be reused for the storage of flammable liquids or combustible liquids unless it has been
a)refurbished so as to conform to one of the standards listed in Sentence 4.3.1.2.(1), or
b)refurbished in conformance with Sentence (2) and (3).
2) A storage tank is permitted to be refurbished for aboveground use in conformance with one of the following standards:
a)ULC-S601(A), “Refurbishing of Steel Aboveground Horizontal Tanks for Flammable and Combustible Liquids,”
b)ULC-S630(A), “Refurbishing of Steel Aboveground Vertical Tanks for Flammable and Combustible Liquids.”
3) A storage tank is permitted to be refurbished for underground use in conformance with one of the following standards:
a)ULC-S603(A), “Refurbishing of Steel Underground Tanks for Flammable and Combustible Liquids,”
b)ULC-S615(A), “Refurbishing of Reinforced Plastic Underground Tanks for Flammable and Combustible Liquids.”
4) A riveted storage tank shall not be relocated.
1) Every outside aboveground storage tank for the storage of flammable liquids or combustible liquids shall be located in conformance with Sentences (2) to (5) with respect to a property line or a building on the same property.
2) Except as provided in Sentences (6) and (7), every aboveground storage tank containing stable liquids and having a working pressure of not more than 17 kPa (gauge) shall be separated from a property line or a building on the same property by distances
a)half those in Table 4.3.2.1., where protection is provided against fire or explosion in the tank in conformance with Sentence 4.3.2.5.(2), or
b)equal to those in Table 4.3.2.1., where protection referred to in Clause (a) is not provided.
| Table 4.3.2.1. Location of Aboveground Storage Tanks Forming Part of Sentences 4.3.2.1.(2), (3) and (4), and 4.9.2.1.(2) and (3) |
|
| Maximum Tank Capacity, L | Minimum Distance to a Property Line or to a Building on the Same Property, m |
|---|---|
| 250 000 | 3 |
| 500 000 | 4.5 |
| 2 500 000 | 9 |
| 5 000 000 | 12 |
| over 5 000 000 | 15 |
3) Every aboveground storage tank containing unstable liquids and having a working pressure of not more than 17 kPa (gauge) shall be separated from a property line or a building on the same property by distances
a)equal to those in Table 4.3.2.1., but not less than 7.5 m, where protection is provided against fire or explosion in the tank in conformance with Sentence 4.3.2.5.(2), or
b)3 times those in Table 4.3.2.1., but not less than 15 m, where protection referred to in Clause (a) is not provided.
4) Every aboveground storage tank containing boil-over liquids shall be separated from a property line or a building on the same property by distances
a)0.75 times those in Table 4.3.2.1., where protection is provided against fire or explosion in the tank in conformance with Sentence 4.3.2.5.(2), or
b)equal to those in Table 4.3.2.1., where protection referred to in Clause (a) is not provided.
(See Appendix A.)5) Where a storage tank containing stable liquids or unstable liquids has a working pressure greater than 17 kPa (gauge), the distances from a property line or a building on the same property shall be those specified in Sentences (2) and (3) multiplied by 1.5, but shall be not less than 7.5 m.
6) The minimum distance required in Sentence (2) from a storage tank containing only Class II or IIIA liquids to a building on the same property is permitted to be reduced to
a)1.5 m provided the tank capacity is not more than 50 000 L, or
b)zero provided the tank capacity is not more than 2 500 L.
7) The minimum distance required in Sentence (2) is permitted to be waived provided the storage tank
a)is in conformance with ULC-S655, “Aboveground Protected Tank Assemblies for Flammable and Combustible Liquids,” and
b)has a capacity of not more than 50 000 L.
8) Where end failure of horizontal storage tanks may endanger adjacent property, the tanks shall be placed with the longitudinal axis parallel to such property.
1) Except as required in Sentences (2) and (3) and in Article 4.3.2.3., the minimum distance between every combination of 2 aboveground storage tanks shall be 0.25 times the sum of their diameters, but shall be not less than 1 m.
2) The minimum distance between any 2 storage tanks, neither of which has a capacity of more than 250 000 L, shall be 1 m.
3) Where either of 2 aboveground storage tanks contains unstable liquids, the distance required in Sentences (1) and (2) shall be doubled.
1) The minimum separation between a flammable liquid or combustible liquid storage tank and a liquefied petroleum gas cylinder or tank shall be 6 m.
2) Secondary containments for flammable liquid and combustible liquid storage tanks shall not contain any liquefied petroleum gas cylinder or tank, and the centre line of the secondary containment wall shall be not less than
a)3 m away from a liquefied petroleum gas cylinder, and
b)6 m away from a liquefied petroleum gas tank.
1) Except as provided in Sentences (2) and (3), storage tanks for flammable liquids or combustible liquids shall be spaced so that each storage tank is accessible for firefighting purposes.
2) An access route constructed in conformance with Subsection 3.2.5. of the British Columbia
Building Code shall be provided in outdoor storage areas to permit the approach of
fire department vehicles to within 60 m travelling distance of any storage tank.
3) Where firefighting access to storage tanks containing Class I or II liquids is not provided, fire extinguishing measures conforming to Sentence 4.3.2.5.(2) shall be provided.
1) Where the diameter of a storage tank exceeds 45 m, the storage tank shall be provided with protection against fires or explosions in conformance with Sentence (2).
2) Protection against fires or explosions required for a storage tank shall consist of fixed protection systems designed in conformance with good engineering practice such as that described in
a)NFPA 11, “Low-, Medium-, and High-Expansion Foam,”
b)NFPA 15, “Water Spray Fixed Systems for Fire Protection,” and
c)NFPA 69, “Explosion Prevention Systems.”
1) Storage tanks shall rest on the ground or on foundations, supports or piling made of concrete, masonry or steel in conformance with
a)Appendix B of API 650, “Welded Steel Tanks for Oil Storage,” and
b)Appendices C and D of API 620, “Design and Construction of Large, Welded, Low-Pressure Storage Tanks.”
2) Tank supports shall be installed on firm foundations designed to minimize uneven settling
of the tank and to minimize corrosion of the part of the tank resting on the foundation.
3) Except for steel saddles that are less than 300 mm high at their highest point, supports
for storage tanks shall provide a fire-resistance rating of not less than 2 h.
4) Every aboveground storage tank shall be supported in a manner that will prevent the allowable design stress of the tank from being exceeded.
1) In areas subject to earthquake forces, storage tanks, supports and connections shall be designed to resist such forces in conformance with
a)Part 4 of the British Columbia Building Code, and
b)Appendix A of ULC-S630, “Shop Fabricated Steel Aboveground Vertical Tanks for Flammable and Combustible Liquids.”
1) When aboveground storage tanks are located in an area that is subject to flooding, the tanks shall be securely anchored to prevent floating.
1) Atmospheric and low pressure storage tanks shall be provided with normal and emergency venting in conformance with
a)API 2000, “Venting Atmospheric and Low-Pressure Storage Tanks: Nonrefrigerated and Refrigerated,” or
b)the tank design standards listed in Sentence 4.3.1.2.(1).
1) When unstable liquids are stored, the effects of heat or gas resulting from polymerization, decomposition, condensation or self-reactivity shall be allowed for in the determination of the total
venting capacity.
1) Except at distilleries covered in Section 4.10., vent piping materials and construction shall conform to Subsections 4.5.2., 4.5.3. and 4.5.5.
1) Normal vent pipe outlets for storage tanks of Class I liquids
a)shall be located outside buildings not less than
i)3.5 m above the adjacent ground level, and
ii)1.5 m from any building opening, and
b)shall discharge so that flammable vapours will not enter the building or be trapped near any part of the building.
2) Normal vent pipe outlets for storage tanks of Class II or IIIA liquids shall discharge outside buildings not less than
a)2 m above the adjacent ground level, and
b)1.5 m from any building opening.
3) Emergency vent outlets for storage tanks shall discharge outside buildings not less than 1.5 m from any building opening and from any combustible component of any building's exterior wall.
1) Except as provided in Sentence (2), 2 or more storage tanks are permitted to be connected to a common vent pipe for normal relief venting provided the vent pipe size is designed to vent the combined vapours produced in the connected
tanks without exceeding the allowable stresses of the tanks.
2) Vent piping for storage tanks for Class I liquids shall not be connected to vent piping for storage tanks for Class II or IIIA liquids unless an effective arrangement is provided to prevent the vapours from the Class I liquids from entering the other tanks.
1) Each connection to an aboveground storage tank through which the liquid can normally flow shall be provided with an internal or external shut-off valve located as close as practical to the shell of the tank.
2) Each connection to an aboveground storage tank that is below the liquid level and through which liquid does not normally flow shall be provided with a liquid-tight closing device.
1) Valves and their connections to a storage tank shall be made of steel, except that when the chemical characteristics of the liquid stored are incompatible with steel, materials other than steel are permitted to be
used.
2) Materials for valves and their connections to a storage tank shall be suitable for the pressures, stresses and temperatures that may be expected, including those of possible fire exposure.
1) Openings for measuring liquid levels in storage tanks for Class I liquids shall be equipped with caps or covers which shall be opened only when measuring the liquid level.
1) Except as provided in Sentence (3), connections used as part of normal operating conditions for filling or emptying storage tanks for flammable liquids and combustible liquids shall be located
a)outside buildings,
b)at a location free of sources of ignition, and
c)not less than 1.5 m away from building openings.
2) Connections for filling or emptying storage tanks shall be kept closed to prevent leakage when not in use.
3) A filling connection described in Sentence (1) is permitted to be located inside a building if
a)this is made necessary
i)by a process or activity located indoors and to which the tank is directly associated, or
ii)for the collection of used liquids, and
b)the fill piping is provided with means to prevent flammable vapours from returning to the building.
1) The area surrounding a storage tank or group of storage tanks shall be designed to accommodate accidental spillage in conformance with Subsection 4.1.6.
2) Where barriers described in Sentence 4.1.6.1.(1) are provided to contain accidental spillage from aboveground storage tanks, they shall conform to the requirements for secondary containment in this Subsection.
3) A storage tank conforming to Sentence 4.3.7.4.(2) shall be considered as conforming to this Subsection provided it is used and maintained in conformance with Articles 4.3.7.8. and 4.3.7.9.
1) Except as provided in Sentence (2), the base and walls of a secondary containment shall be made of noncombustible materials, and shall be designed, constructed and maintained to
a)withstand full hydrostatic head, and
b)provide a permeability of not more than 10-6 cm/s to the flammable liquids or combustible liquids contained in the storage tanks.
2) Where a membrane provides the level of impermeability required in Sentence (1), it shall
a)conform to ULC/ORD-C58.9, “Secondary Containment Liners for Underground and Aboveground Flammable and Combustible Liquid Tanks,” and
b)when the membrane is combustible, be covered with a noncombustible material of such nature and thickness that the membrane will not fail when the secondary containment is exposed to fire.
3) Except as provided in Sentence (4), openings shall not be permitted in a secondary containment.
4) Where piping passes through a secondary containment, such passages shall conform to
Sentences (1) and (2).
1) Except as permitted in Sentence (3), a secondary containment for a single storage tank shall have a volumetric capacity of not less than 110% of the capacity of the tank.
2) Except as permitted in Sentence (3), a secondary containment for more than one storage tank shall have a volumetric capacity of not less than the sum of
a)the capacity of the largest storage tank located in the contained space, and
b)10% of the greater of
i)the capacity specified in Clause (a), or
ii)the aggregate capacity of all other storage tanks located in the contained space.
3) When the secondary containment is designed to prevent the entry of precipitation and
water used for firefighting purposes into the contained space, it shall have a volumetric
capacity of not less than the capacity of the largest storage tank located in the contained space.
1) Except as provided in Sentence (2), no part of a secondary containment wall shall be less than 1.5 m from a storage tank shell.
2) It is permitted to waive the distance required in Sentence (1) provided the storage tank
a)is constructed in accordance with
i) Clauses 4.3.1.2.(1)(l), (m) or (o), incorporating secondary containment, or
ii) Clauses 4.3.1.2.(1)(e) or (j) for double-walled storage tanks,
b)has a capacity of not more than 50 000 L, and
c)is protected by posts or guardrails when exposed to collision damage.
1) A secondary containment shall permit
a)access to storage tanks, valves and ancillary equipment,
b)egress from the contained space, and
c)access for firefighting as specified in Article 4.3.2.4.
(See Appendix A.)2) Where a storage tank contains Class I liquids, provisions shall be made for the normal operation of valves and for access to the storage tank roof without entering the contained space created by the secondary containment when
a)the average height of the secondary containment exceeds 3.5 m, measured from the ground level of the interior of the contained area, or
b)the distance between the tank shell and the top inside edge of the secondary containment wall is less than the height of this wall.
(See Appendix A.)1) Where the secondary containment is not open to the atmosphere, emergency venting shall
be provided to relieve any buildup of internal pressure in the contained space when
exposed to heat or fire.
1) Where the contained space created by the secondary containment is not accessible for
visual examination, a monitoring device shall be provided to indicate the presence
of liquid in, or the loss of integrity of the secondary containment. (See Sentence 4.4.2.1.(7).)
1) Liquids, debris and precipitation shall not accumulate in the contained space created
by the secondary containment.
2) Provisions shall be made for removing liquid from the secondary containment in conformance
with Subsection 4.1.6.
3) Controls for the liquid removal system required in Sentence (2) shall be
a)normally closed,
b)accessible under fire exposure conditions, and
c)located so they can be operated from outside the contained space.
1) The contained space created by a secondary containment shall not be used for storage
purposes.
1) Underground storage tanks shall be located so that loads from building foundations and supports are not transmitted to the tank.
2) Underground storage tanks shall be separated by a horizontal distance of not less than
a)600 mm from adjacent underground tanks or structures,
b)1 m from a building foundation or a street line, and
c)1.5 m from other property lines.
1) Except as required in Sentences (2) to (4), underground storage tanks shall be installed with not less than 600 mm of ground cover over the tank.
2) Except as required in Sentence (3), storage tanks subjected to vehicular traffic shall be installed not less than 1 m below finished ground level.
3) Either a 150 mm reinforced concrete slab or a 200 mm unreinforced concrete slab over
not less than 450 mm of sand is permitted in lieu of the protection described in Sentence (2) provided the slab extends at least 300 mm beyond the storage tank.
4) Where subsurface conditions make it impracticable to install a storage tank totally below adjacent ground level, an underground storage tank shall be installed so that at least
a)75% of its mass is below adjacent ground level provided there is not less than 600 mm of ground cover over the portion of the tank above adjacent ground level, or
b)50% of its mass is below adjacent ground level provided there is not less than 1 m of ground cover over the portion of the tank above adjacent ground level.
1) Underground storage tanks that are in the process of being installed shall be inspected, and any damage to the tank shell, protective coating, fittings or anodes shall be repaired before they are lowered into the excavation.
2) Damage to storage tank shells shall not be repaired on site.
1) Underground storage tanks shall be lowered into the excavation by the use of lifting lugs and hooks and, where necessary, spreader bars to prevent damage to the tank shell, protective coating, fittings or anodes.
2) Any method of handling that might result in damage to the protective coating of the
tank shall not be used.
1) Underground steel storage tanks shall be installed in conformance with Appendix B of CAN/ULC-S603.1, “External Corrosion Protection Systems for Steel Underground Tanks for Flammable and Combustible Liquids.”
2) Underground reinforced plastic storage tanks shall be installed in conformance with Appendix A of ULC-S615, “Reinforced Plastic Underground Tanks for Flammable and Combustible Liquids.”
3) Underground storage tanks shall not be placed in direct contact with reinforced concrete slabs but shall be separated by not less than 150 mm of sand or other suitable material to evenly distribute
the weight of the tank on the supporting base.
1) Flammable liquids or combustible liquids shall not be placed in an underground storage tank until
a)the fill pipe and vent line have been installed in the tank, and
b)all other openings have been sealed.
1) If a spillage occurs, the escaped liquid and all soil contaminated by the spill shall
be removed in conformance with Subsection 4.1.6.
1) Underground storage tanks shall be protected against hydrostatic forces which can cause the uplift of the tanks once they are empty. (See Appendix A.)
2) Where anchors and ground straps are used to resist the uplift forces referred to in
Sentence (1), they shall be
a)electrically isolated from the tank, and
b)installed in such a manner that they do not damage the tank's shell, protective coating, fittings or anodes.
1) Except as provided in Sentence (2), underground steel storage tanks and associated piping and fitting subject to corrosion shall be protected in conformance with CAN/ULC-S603.1, “External Corrosion Protection Systems for Steel Underground
Tanks for Flammable and Combustible Liquids.”
2) A steel storage tank not conforming to Sentence (1) is permitted provided it has corrosion protection conforming to good engineering practice such as that described in PACE Report No. 87-1, “Impressed Current Method
of Cathodic Protection of Underground Petroleum Storage Tanks,” published by the Canadian
Petroleum Products Institute.
1) Underground storage tanks shall be provided with vent openings and piping of sufficient cross-sectional area designed to vent the tanks during the maximum filling or withdrawal rate without causing
the allowable stress for the tank to be exceeded.
1) Except at distilleries covered in Section 4.10., vent piping materials and construction shall conform to Subsections 4.5.2., 4.5.3. and 4.5.5.
1) Vent pipe outlets from underground storage tanks for Class I liquids
a)shall be located outside buildings higher than the fill pipe openings but not less than
i)3.5 m above the adjacent ground level,
ii)1.5 m from any building opening, and
iii)7.5 m from any dispenser, and
b)shall discharge so that flammable vapours will not enter building openings or be trapped near any part of the building.
2) Vent pipe outlets from underground storage tanks for Class II or IIIA liquids shall be located outside buildings at a height that is above the fill pipe opening but not less than 2 m above finished ground level.
3) Vent pipes from underground storage tanks for flammable liquids or combustible liquids shall not be obstructed by any device that may cause excessive back pressure, except that vent pipes from underground storage tanks for Class II or IIIA liquids are permitted to be fitted with return bends, coarse screens or other devices to minimize the entry of foreign material.
4) Vent piping shall enter the storage tank through the top of the tank and shall not extend into the tank more than 25 mm except when the vent is equipped with a vent alarm.
5) Vent piping shall be
a)installed so that any nominally horizontal run shall slope towards the storage tank,
b)constructed without traps,
c)adequately supported to prevent sagging, and
d)where necessary, protected against mechanical damage.
1) Except as permitted in Sentence (2), where vent piping connects 2 or more storage tanks, pipe sizes shall be designed to vent the combined vapours produced in the connected underground storage tanks without exceeding the allowable stresses of the tanks when being filled simultaneously.
2) Where it is not possible to fill the connected storage tanks referred to in Sentence (1) simultaneously, or where the connected vents have a vapour recovery system, the vent piping shall be sized to accommodate the maximum vapour flow possible in the system.
3) Vent piping for an underground storage tank containing a Class I liquid shall not be connected to the vent piping for a storage tank containing a Class II or IIIA liquid unless an effective method is provided to prevent the vapours from the Class I liquid storage tank from entering the other tank.
1) Connections for all openings in underground storage tanks shall be liquid- and vapour-tight.
1) Openings for measuring liquid levels in underground storage tanks if independent of the fill pipe shall be equipped with a vapour-tight cap or cover which shall be opened only when measuring the liquid level.
1) Fill piping and discharge piping shall enter underground storage tanks only through the top of the tank and discharge piping used in suction systems shall be sloped toward the storage tanks.
2) Remote fill outlets from an underground storage tank shall not be located higher than other outlets from the tank.
3) Except as provided in Sentence (5), connections used as part of normal operating conditions for filling or emptying storage tanks for flammable liquids and combustible liquids shall be located
a)outside buildings,
b)at a location free of sources of ignition, and
c)not less than 1.5 m away from building openings.
4) Connections for filling or emptying storage tanks described in Sentence (3) shall be kept closed to prevent leakage when not in use.
5) A filling connection described in Sentence (3) is permitted to be located inside a building if
a)this is made necessary
i)by a process or activity located indoors and to which the tank is directly associated, or
ii)for the collection of used liquids, and
b)the fill piping is provided with means to prevent flammable vapours from returning to the building.
1) Except as provided in Article 4.3.12.2., storage tanks inside buildings shall
a)conform to Subsection 4.3.12. to 4.3.14., and
b)be permitted only in industrial occupancies.
1) Installations using Class I liquids as fuel supplies for stationary engines inside
buildings shall conform to NFPA 37, “Installation and Use of Stationary Combustion Engines and Gas Turbines.”
1) The static head imposed on a storage tank inside a building shall not exceed 70 kPa (gauge) at the bottom of the tank when the vent or fill pipe is filled with liquid unless the tank is designed for greater pressures.
1) Except as provided in Subsection 4.2.8. and in Sentence (2), storage tanks for flammable liquids or combustible liquids shall be
a)located in dedicated storage rooms conforming to Subsection 4.3.13., and
b)located in conformance with Table 4.3.12.4.
2) When quantities greater than are permitted for incidental use in Subsection 4.2.8. are required for special process operations, storage tanks for flammable liquids or combustible liquids are permitted to be located outside of a storage room referred to in Sentence (1), provided that
a)total quantities per fire compartment are not more than one-half the quantities permitted in Table 4.3.12.4.,
b)they are located on the first storey, and
c)the installation conforms to Articles 4.3.12.7. to 4.3.12.10. and Article 4.3.13.4.
| Table 4.3.12.4. Indoor Tank Storage Forming Part of Sentences 4.3.12.4.(1) and (2), and 4.3.12.6.(1) |
|||
| Class of Liquid | Storage Level | Maximum Quantity per Storage Room(1), L | |
|---|---|---|---|
| One or More Tanks | |||
| Protected Storage(2) | Unprotected Storage | ||
| Class I | First storey | 40 000 | 25 000 |
| Storeys above the first storey | 7 500 | Not Permitted | |
| Basement | Not Permitted | Not Permitted | |
| Class II and IIIA | First storey | 200 000 | 100 000 |
| Storeys above the first storey | 20 000 | Not Permitted | |
| Basement | 20 000 | Not Permitted | |
| Notes to Table | |
|
|
|
| (1) | See Subsection 4.3.13. |
| (2) | See Article 4.2.7.6. |
1) Fire compartments regulated by this Subsection shall be separated from the remainder of the building by a fire separation having a fire-resistance rating of not less than 2 h.
1) When 2 or more classes of liquids are stored in a single storage room referred to
in Sentence 4.3.12.4.(1), the total quantity permitted for each class of liquid shall be calculated as follows:
where
| qi | = the actual quantity of Class I liquids present, |
| qii + iiia | = the actual quantity of Class II and IIIA liquids present, |
| Qi | = the maximum quantity of Class I liquids permitted in Table 4.3.12.4., |
| Qii + iiia | = the maximum quantity of Class II and IIIA liquids permitted in Table 4.3.12.4. |
1) Where storage tanks for flammable liquids or combustible liquids are located outside of storage rooms conforming to Subsection 4.3.13.,
a)provision shall be made to contain 100% of the volume of the largest storage tank, or to drain away spilled flammable liquids or combustible liquids, and
b) the area in which the storage tanks are located shall be ventilated (See Appendix A).
1) Except as provided in Sentence (2), normal and emergency vents for storage tanks in buildings shall be provided in conformance with Subsections 4.3.4. and 4.3.5. (See Appendix A.)
2) The use of weak roof-to-side shell seams, designed to rupture before the allowable
design stress of the storage tank is reached, shall not be permitted as a means of emergency venting of storage tanks inside buildings.
1) Except as provided in Sentence (2), where storage tanks for flammable liquids or combustible liquids are installed inside buildings, the supports, foundations and anchorage for such storage tanks shall be in conformance with Subsection 4.3.3.
2) Where a storage tank is suspended, rather than supported on a foundation, supports shall be designed and installed in conformance with good engineering practice. (See Appendix A.)
1) Where storage tanks for flammable liquids or combustible liquids are installed inside buildings, tanks, piping and discharge equipment shall be bonded and grounded.
1) Rooms for storage tanks inside buildings, referred to in Sentence 4.3.12.4.(1), shall be
a)separated from the rest of the building by a fire separation having a fire-resistance rating of at least 2 h,
b)designed to contain 100% of the volume of the largest storage tank, or to drain away spilled flammable liquids or combustible liquids,
c)made liquid-tight where the walls join the floor, and
d)used for no other purposes than the storage and handling of flammable liquids or combustible liquids.
1) A minimum clear space of 550 mm shall be maintained between the walls of a room described
in Article 4.3.13.1. and the sides of any storage tanks within the room.
1) Where Class IA or IB liquids are dispensed within a storage room, the room shall be
designed to prevent critical structural and mechanical damage from an internal explosion
in conformance with good engineering practice such as that described in NFPA 68, “Venting
of Deflagrations.” (See A-3.2.8.2.(1)(d) in Appendix A.)
1) In buildings not required to be equipped with a standpipe and hose system by the British Columbia Building Code, hose stations shall be provided in the vicinity of the storage room,
such that all parts of the room are within reach of a hose stream. (See Appendix A.)
2) Portable extinguishers for Class B fires shall be provided.
1) Placards conforming to Article 3.2.7.14., identifying the liquids stored as flammable liquids or combustible liquids and the capacities of the storage tanks, shall be posted in a conspicuous location outside of the room, and that information shall be included in the fire safety plan required in Article 4.1.5.5.
1) Connections for all openings in storage tanks in buildings shall be liquid- and vapour-tight.
2) Connections to storage tanks through which liquid can flow shall be provided with valves located as close as practicable to the tank.
1) Openings that are independent of the fill pipe and are used for measuring the liquid
level in storage tanks containing Class I or II liquids shall be equipped with a vapour-tight cap which shall be opened only when measuring the liquid level.
2) Openings referred to in Sentence (1) shall be protected against overflow and vapour pressure by means of a spring-loaded check valve.
1) The removal, abandonment in place, disposal or temporary taking out of service of
an underground storage tank shall be in conformance with good engineering practice. (See Appendix A.)
1) When an aboveground storage tank will be out of service or unsupervised for a period not exceeding 180 days, the piping from the tank shall be capped or the valves that are necessary to achieve similar
isolation of the tank shall be closed and securely locked.
2) Where a storage tank referred to in Sentence (1) contains flammable liquids or combustible liquids, the liquid level in the tank shall be measured and compared with subsequent readings taken at intervals not greater than one month.
3) When an aboveground storage tank will be out of service or unsupervised for a period exceeding 180 days, all liquid and vapours shall be removed from the storage tank and its connected piping.
1) Where a storage tank is to be permanently disposed of, sufficient openings shall be cut in the tank to render it unfit for further use.