Where:
S refers
to total exterior area of the tank, (m2)
A refers
to discharge rate at 15 oC and atmospheric pressure, (m3/min).
In regard
to tanks whose dimensions are not listed above, use the formula: A= 3,1965 . S0,82
- Flow
rate of safety valves fitted to an above ground tank shall equal 3,33 times the
corresponding values under Schedule 1.
- Requirements
in safety valve installation:
+ In
regard to installed safety valves that must be isolated for inspection,
testing, and/or maintenance, if one valve is isolated, the other valve shall
still be able to fulfill discharge rate requirements.
+ Safety
valves shall be connected to and be located as close as possible to vapour
chamber.
+ Avoid
formation of liquid traps and pressure obstructing accurate operation of safety
valves, especially in case of long drain pipes.
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4.7.3.
Liquid-form LPG fueling valves
A check
valve and a shut-off valve shall be fitted on liquid-form LPG fueling line.
Pipes whose nominal diameter exceeds 50 mm shall be fitted with flange valves
made from forged steel and having minimum working pressure equal to design
pressure of pipe system.
4.7.4.
Liquid-form and gas-form LPG withdrawal valves
Outlet
pipes of LPG withdrawal line shall be fitted with emergency shut-off valves
which allow rapid manual closing or manual and automatic closing in order to
disrupt LPG supply in case of emergency. Pipes whose nominal diameter exceeds
50 mm shall be fitted with flange valves made from forged steel and having
minimum working pressure equal to design pressure of pipe system.
4.7.5. Bottom
drain valve
Bottom
drain outlets of tanks shall be located at the lowest liquid point. Exterior
bottom drain pipes shall be fitted with two shut-off valves that are leak
resistant and 500 mm apart along the length of the pipe.
4.7.6.
Liquid-form LPG gauge
- Tanks
shall be fitted with at least one gauge for measuring liquid with measuring
spectrum covering the entire volume of the tanks.
- A
minimum of 1 mechanical-type gauge or water gauge or automatic gauge is
required.
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4.7.7.
Manometer
Manometer
shall be fitted to tank section that contains gas-form LPG:
- Maximum
class of accuracy shall be 2,5.
- Minimum
diameter of manometer shall be 75 mm.
- Measuring
spectrum shall be sufficient so that maximum working pressure is between 1/3 to
2/3 of the spectrum.
4.7.8.
Labels on tank shells shall contain the information below at a minimum:
- Name of
manufacturer and manufacturing number.
- Manufacturing
date.
- Contents.
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- Design
pressure.
- Design
temperature.
- Volume.
- Hydraulic
test pressure and hydraulic test date.
4.7.9. Outdoor
vertical tanks shall, in addition to complying with regulations above, comply
with the followings:
- Tanks
shall be designed to withstand their own load without the use of bracing and
shall satisfy specific design principles including wind, seismic, and
hydrostatic pressure.
- Wind
load applied to tanks shall be based on wind pressure on projected area in
regions with varying ground elevations in a manner appropriate with standards
on wind load of Vietnam.
- Seismic
load applied to tanks shall be based on force basis instructed under standards
on seismic load of Vietnam.
4.7.10.
Corrosion allowance
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5.
Regulations
on installation
5.1.
Installation location and separation distance of tanks
5.1.1. LPG
tanks shall be located outdoors, in open spaces, or outside of enclosed structures.
Tanks shall not be placed on the roofs, in balconies, in basements, or beneath
structures.
5.1.2. Do
not install tanks beneath members such as awnings, bridges, or overhead power
lines.
Separation
distance from tanks to overhead power lines shall comply with electricity
safety laws.
5.1.3.
Tanks shall not be stacked on top of one another. Horizontal cylindrical tanks
shall not be line up length-wise with other tanks and not be directed towards
houses or service establishments.
5.1.4. If
LPG tank placement areas are located near roads leading to occupied areas, LPG
tanks shall be surrounded by open fences that are at least 1,8 m tall and at
least 1,5 m away from the tanks. These fences shall have at least 2 entrances
that are not close to one another. Each entrance shall have a minimum width of
1 m, be fitted with out-swinging protective door that is not installed with
automatic locks.
If
technical trenches and channels are present, these shall be filled with sand
and covered with load-bearing boards if vehicles travel on top of them.
5.1.5.
Minimum separation distance from LPG tanks to tanks containing flammable liquid
with flash point below 65 oC shall be 7 m.
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5.1.6.
Measures shall be taken to eliminate all sources of fire in tank areas.
5.1.7.
Separation distance between LPG tanks and hydrogen tanks, oxygen tanks shall be
compliant with Schedule 2:
Schedule 2. Separation distance between LPG tanks and
hydrogen tanks, oxygen tanks
Tank volume, V (m3)
Separation distance to oxygen tanks with volume of (m3*)
Separation distance to hydrogen tanks with volume of (m3*)
≤11
11 + ~566
> 566
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11 ~ 85
> 85
≤ 4,5
none
6
7,6
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none
6
15
≤1,9
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none
3
7,6
> 1,9
none
7,6
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* Volume
of oxygen tanks and hydrogen tanks (m3) is measured at 21 oC
and atmospheric pressure
Separation
distance shall not be required if fire protective structures effective for a
minimum of 2 hours are installed between non-insulative sections of hydrogen
tanks or oxygen tanks and LPG tanks.
5.1.8.
Minimum separation distance from tanks to protected objects and between tanks
shall be compliant with schedule 3:
Schedule 3 - Minimum separation distance from tanks to
protected objects and between tanks
Tank volume, V (m3)
Minimum separation distance (m)
Separation distance between tanks (m)
Underground tank
Above ground tank
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3
1,5
0
0,5 < V ≤ 1
3
3
0
1 < V ≤ 1,9
3
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1
1,9 < V ≤ 7,6
3
7,6
1
7,6 < V ≤ 114
15
15
1,5
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15
23
1/4 of the sum of diameter of two adjacent tanks
265 < V ≤ 341
15
30
341 < V ≤ 454
15
38
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15
61
1/4 of the sum of diameter of two adjacent tanks
757 < V ≤ 3785
15
91
V > 3785
15
122
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Schedule 4 - Maximum above ground tanks in a group and
separation distance between tank groups
Firefighting facilities and system equipped serving the
tank
Maximum number of tanks in a tank group (tank)
Minimum separation distance between tank group (m)
Water
outlet and hose reel
6
15
Stationary
fire monitors (positioned so that they can cover the entire surface)
6
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Stationary
water mist system
9
7,6
Tank
fitted with insulative layers to keep tank temperature from exceeding 427 oC
and have up to 50 minutes of heat resistance
9
7,6
5.2. Tank
installation
5.2.1.
Tanks shall be positioned in a way so that safety valves are directly connected
to vapour containment section of the tanks. Outlets shall be located at an
elevated position, clear area, and directed upwards. Outlets of safety valves
shall not be directed towards tanks, LPG pipes, and operators.
5.2.2. LPG
tanks shall be fitted with adequate safety and measuring equipment as per the
law. Tanks shall be fitted with emergency shut-off valves.
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5.2.4.
Above ground tanks shall be painted to achieve corrosion resistance.
5.2.5.
Tanks shall be installed in a manner that allows easy access for operation,
repair, and maintenance purposes.
5.2.6.
Tanks shall not be located in frequently flooded areas. Underground and mounded
tanks located in areas with high groundwater level shall be firmly anchored.
5.3.
Drainage
5.3.1.
Surface below or around LPG tanks shall be sloped to drain liquid out of tank
and pipe area and prevent LPG build-up when tanks leak. The minimum slope
grading is 1%.
5.3.2.
Drainage system shall be designed to prevent liquid spilling from one tank to
the underside of other tanks and minimize risks to pipe systems due to LPG
spill.
5.3.3. If
tanks are fitted with water-based firefighting system, drainage system shall
then be calculated to ensure sufficient drainage capability.
5.4.
Requirements regarding installation of underground or mounded tanks
5.4.1.
Underground tanks shall satisfy requirements below:
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- The top
of tank compartments shall be designed to withstand load, and avoid damage when
vehicles move on top in case of force majeure.
- Connections
and couplings of tanks, pipes shall be protected from vehicular collision.
- Tanks
shall be painted or coated to minimize corrosion.
- Damage
to the paint coat shall be rectified prior to installation.
- Tanks
shall be placed on flat ground and covered by tightly compacted soil or sand.
- Soil and
sand covering the tanks shall not contain rocks or corrosive substances.
5.4.2.
Mounded tanks shall be installed as follows:
- Mound
materials shall be sand, soil, or other non-flammable, non-corrosive materials
and minimum thickness shall be 0,3 m.
- Protective
covering shall be placed on top of mound materials to prevent corrosion.
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- Mounded
tanks shall be painted or protected to minimize corrosion.
6.
Tank
bracket and foundation
6.1.
Design of tank bracket and foundation shall be compliant with applicable
regulations, standards on LPG tank design and construction.
6.2.
Adequate geological survey documents shall be required to identify permissible
load, total subsidence and uneven subsidence, including unexpected seismic
activities, risk of propulsion, and deviation from original conditions.
6.3. In
order to minimize subsidence, especially uneven subsidence shall be included in
design calculation of bearing pads in order to minimize stress build-up in
tanks and pipes.
6.4. The
welding of brackets to LPG tanks shall be compliant with welding laws.
6.5.
Design of bearing pads shall allow tank displacement due to pressure and
temperature. Pipe fittings shall be located in secured ends.
6.6.
Design of bearing pads shall prevent liquid build-up or include drainage
outlets prevent liquid build-up.
6.7. Tank
support system shall be designed so that the tanks lean towards discharge
outlets at a degree of 1:100 to 1:400.
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6.9.
Bearing pads shall have a minimum of 2 hours of fire resistance and
waterproofing capability.
6.10.
Support structures shall reserve sufficient space under the tank for pipe
installation, safe operation and maintenance of equipment below.
7.
Regulations
on electricity safety
7.1.
Danger zone classification
- Zone 0:
Means an area where LPG - flammable gas mixture is present on a regular basis
during normal operation;
- Zone 1:
Means an area where LPG - flammable gas mixture is not present on a regular
basis during normal operation;
- Zone 2:
Means an area where LPG - flammable gas mixture is not present at all during
normal operation or in short period of time if it is present.
Regulations
on danger zones relating to LPG tanks shall be compliant with Schedule 5.
Schedule 5 - Danger zones of electric appliance in LPG
tank area
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Radius
Danger zone
Tank
a)
Within a 1,5 m radius in all direction from connecting points of the tank
Zone 1
b) Up to
1,5 m above the foundation down to 0 within a 3 m radius from the tank shell,
not including the radius under a)
Zone 2
Safety valve
a) In
the direction of discharge
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b)
Within a 1,5 m radius in all directions
Zone 1
c) From
exceeding 1,5 m to 4,5 m in all directions from point of discharge
Zone 2
Filling coupler
a)
Within a 1,5 m radius in all directions
Zone 1
b) From
exceeding 1,5 m to 4,5 m radius in all directions.
Zone 2
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- Electric
appliances in danger zones shall be explode-proof, inspected as per the law, and
have the highest surface temperature rating depending on installation location,
rated voltage and frequency of the electrical grid.
- Installation,
operation, and maintenance of electric appliances shall be complaint with
approved design and technical instructions of manufacturers.
- Equipment
that contains electrical and electronic circuits that are not safe circuits and
is located in areas with fire, explosion hazards shall be placed in
explode-proof electrical panels.
- Selection
of electric appliances shall prevent all equipment from working at an
overloaded state.
7.3.
Static safety
Above
ground LPG tanks shall be grounded where the maximum ground resistance is not
greater than 4Ω.
8.
Requirements
regarding fire safety and firefighting
8.1. LPG
tank area shall be well-ventilated not contain trees or flammable materials in
the vicinity.
8.2. All
firefighting facilities shall have sufficient quantity, type, and quality as
per fire safety and firefighting laws.
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8.4.
Cooling water
Water
sources for firefighting, fire hose, stationary water mist system, and control
scheme supplying water for stationary water mist system and fire hose shall be
compliant with QCVN 01:2019/BCA.
9.
Regulations
on operation
9.1
General requirements
9.1.1.
Operating procedures, safety regulations, and incident response procedures for
LPG tanks shall be placed in visible locations.
9.1.2.
Operation logs and repair logs shall be required at the establishments.
9.1.3.
Individuals conducting operation tasks shall receive professional training,
safety training, and fire safety training as per the law.
9.2.
Filling LPG in tanks
9.2.1.
Separation distance from points where LPG is withdrawn from tanker trucks or
tankers to tanks shall be compliant with Schedule 6.
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Adjacent structures
Separation distance (m)
Above
ground LPG tanks with volume from 16 m3 to less than 25 m3
3
Above
ground LPG tanks with volume from 25 m3 to less than 125 m3
6
Above
ground LPG tanks with volume from 125 m3
9
9.2.2. LPG
content in tanks shall not exceed the permissible limit. Gauge indicating LPG
content shall have marker indicating permissible limit.
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9.2.3. All
LPG tanks shall be protected from corrosion. Protective coating shall be
inspected at least once every two years to prevent corrosion. Tank shell
thickness shall be inspected on a regular basis and at least once every fire
years.
9.2.4. On
a daily basis, operators shall examine working conditions of equipment LPG
filling plants in accordance with operating procedures in order to maintain
safe and proper working conditions and prevent LPG leak.
10.
Regulations
on maintenance
10.1. LPG
tank users shall be responsible for maintaining and ensuring tank operation in
safe conditions.
10.2.
Maintenance procedures of LPG tanks shall be required..
10.3.
Maintenance shall be performed on a periodic basis, at least once every five
years.
10.4.
Maintenance shall be performed by qualified and experienced persons.
10.5.
Maintenance shall be recorded by users in tank logs.
11.
Regulations
on examination and test
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- Hydraulic
test.
- Airtight
test.
- Ultrasonic
thickness (UT) gauge.
- Radiographic
testing (RT) or similar methods.
- Magnetic
test (MT).
- Paint
coating thickness gauge.
11.2.
Hydraulic test:
11.2.1.
Hydraulic test shall only be conducted when installation and repair have been
finished and tanks are deemed satisfactory for testing by means of examination.
LPG tanks
shall be exempt from hydraulic test during initial inspection if the tanks have
been released from manufacturing within the last 18 months, are properly
handled, are not damaged or deformed during transportation or installation. Inspection
records shall state reasons and attach release test records of manufacturing
facilities, installation commissioning records (if any).
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11.2.3.
Test solutions shall be water at a temperature below 50 oC and no
more than 5 oC below ambient temperature.
11.2.4.
Hydraulic test pressure shall be sustained for 5 minutes. If manufactures
stipulate a longer sustained period, manufacturers' stipulations shall prevail.
11.2.5.
Test procedures
- Load test
solutions: Fill the tanks with test solutions (note gas purge during liquid
test).
When test
liquid is loaded in above ground tanks, monitor subsidence of support
structures and immediately stop loading the tanks if subsidence is greater that
the prescribed subsidence.
- Raise
pressure to test pressure (gradually in order to prevent sudden expansion which
damages the tank) and do not use test hammer when test pressure is reached).
Monitor and detect any irregularity during test process.
- Sustain
test pressure as per the law.
- Reduce
test pressure to working pressure gradually and maintain at working pressure
throughout inspection process. Then reduce pressure to (0); rectify any damage
(if any) and reexamine rectified results.
If water
test is not feasible due to stress of support structures, support platforms or
due to difficulty in draining liquid or due to strength test being conducted
using gas.
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During
tests using gas, specific solutions and safety measures shall be required.
- Examine
airtightness using soapy solution or other methods. Do not use test hammer
while testing using gas pressure.
- Monitor
displacement of foundation and LPG tanks during test process.
11.2.6.
Hydraulic test results are satisfactory when:
- No crack
is visible.
- No gas
bubble, water mist, or water droplet is found leaking through welded joints and
joints in general.
- No
deformation is found.
- Displacement
of foundation, LPG tanks shall not exceed the displacement level prescribed by
tank designers.
11.3.
Airtight test
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11.3.2.
Test solution shall be gases or inert gases. Minimum test pressure shall be
0,75 MPa. Minimum test duration shall be 30 minutes.
11.3.3.
Test for leak using soapy solution or appropriate measures.
11.3.4.
Airtight test results shall be satisfactory when:
- No gas
leak is found.
- Permissible
pressure drop during sustained pressure period: ≤0,5% of test pressure.
12.
Regulations
on inspection
12.1.
Inspection interval and methods:
12.1.1.
Initial inspection: After inspection, before bringing into use
12.1.2.
Periodic inspection:
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-Internal
and external inspection: once every 3 years.
- If
manufacturers or the facilities require a shorter interval between technical
and safety inspections, such request shall be strictly adhered to.
- If
intervals between technical and safety inspections are shortened, inspecting
individuals shall specify the reason under inspection records.
If LPG
tanks belong to active manufacturing lines and therefore cannot be isolated for
inspection, inspection interval shall conform to maintenance, repair intervals
of the manufacturing lines without exceeding the interval prescribed by
manufacturers or corresponding national technical regulations. Organizations
and individuals managing, using machinery and equipment shall maintain and be
responsible for safe working conditions of these machinery and equipment.
If
periodic hydraulic test cannot be carried out due to technological reason or
practical conditions, it is possible to employ non-destructive techniques to
examine material conditions, metal surface, thickness, and welded joints of
equipment.
12.1.3.
Irregular inspection:
- When
repair, upgrade, or renovation affects technical or safety conditions of LPG
tanks.
- When
installation location is changed.
- When tanks
have not been operated for at least 12 months.
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12.1.4. If
facilities utilize LPG tanks that satisfy regulations on risk-based inspection
(RBI) of the Ministry of Industry and Trade, inspection interval shall conform
to RBI results.
12.2.
Inspection steps:
- Preparation.
- Internal
and external inspection.
- Hydraulic
test.
- Airtight
test.
- Operation
test.
12.3.
Preparation:
12.3.1.
Document inspection:
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a) For
initial inspection
- Inspect
background documents of LPG tanks: Pay attention to documents below:
+ Criteria
regarding manufacturing metal, welded metal.
+ Strength
calculation of pressure parts.
+ Design
drawings that include all primary dimensions.
+
Operation, maintenance, and repair instructions.
- Factory
release documents of LPG tanks
+
Certificates pertaining to manufacturing metals, welding metals.
+ Quality
inspection results of welded connection.
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- Reports on
calibration results of measuring instruments; inspection records of grounding,
lightning protection, protective equipment.
- Installation
documents:
+ Name of installing
facilities and using facilities.
+
Characteristics of additional materials in installation.
+
Commissioning for construction of foundation and support structures of LPG
tanks.
+ Welding
documents in regard to welded joints subject to pressure during installation:
Dossiers on welders (certificates, symbols, inspection results of welding
samples); Welding procedures; Welding consumable certificates; Welding charts
(locations of welded joints and welder arrangement); Results of welded joint
visual inspection, non-destructive technique inspection (ultrasonic,
radiographic imaging, osmosis), inspection records and radiographic imaging
films. Weight of each welded joint inspected by ultrasonic methods or
radiographic imaging shall be compliant with Section 5.4 of TCVN 6008:2010 or
compliant with their manufacturers (if requirements of the manufacturers are
higher); Certificates of individuals conducting non-destructive inspection of
welded joints.
If welded
joints are required to be hot-wrought, provisions under Section 4.12 of TCVN
6008:2010 shall be complied with.
+
Inspection records of each tank part (if any).
+ Drawings
indicating tank, tank group installation location.
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- Examine working
time of LPG tanks, the latest inspection records, the latest certificate of
inspection.
- Feedback
and conclusions regarding operating capability of LPG tanks, propositions and
implementation thereof under previous inspection records.
- Inspection
of periodic inspection results of measuring instruments, protective equipment,
safety equipment, lightning protection equipment and replacement, repair of
these equipment.
- Review of
thickness of LPG tank parts previously measured (if any).
- Inspection
of logs, repair and replacement logs of parts and equipment of LPG tanks.
- Inspection
of LPG tank logs and log update.
- Review
operating and incident response procedures, operation logs.
c) For
irregular inspection
- If LPG
tanks are repaired, renovated, or upgraded.
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+
Inspection of design, repair, renovation, and upgrade documents.
+ Details
of renovation and repair solutions. Strength calculation of LPG tanks following
renovation and upgrade (if any).
+
Conformity of auxiliary equipment, calibrating equipment, and safety mechanism
following renovation to LPG tanks.
+
Certificate of quality inspection and factory release inspection of replacement
parts. Replacement and repair materials shall not be weaker than the original
materials.
+
Commissioning records following repair, renovation, and upgrade.
+ Welding
documents during repair, renovation: Similar to those in the case of initial
inspection.
+
Compliance with inspection details similar to those in the case of periodic
inspection.
- For change
to installation location: Review of installation documents.
+ Cause to
change of installation location.
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+
Compliance with inspection details similar to those in the case of periodic
inspection.
- For LPG
tanks that have not been used for at least 12 month:
+ Cause
for ceasing to work for more than 12 months.
+
Compliance with inspection details similar to those in the case of periodic
inspection.
12.3.2.
Standard equipment serving inspection
Inspection
equipment shall be inspected and examined for availability, conformity to
working conditions, and accuracy; kept at safe conditions in inspection area.
12.3.3.
Equip adequate tools, personal protective equipment, and safety equipment
during inspection process.
12.3.4.
Prior to carrying out inspection, inspecting bodies and entities managing,
using LPG tanks shall agree on inspection procedures and safety measures.
12.4.
External and internal inspection
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- Physical
inspection of on-site installation for conformity to design dossiers and this
Regulation, relevant National Standards, National Regulations.
- Number of
tanks in a group; minimum separation distance from tanks to protected objects
and between tanks.
- Arrangement
of tanks.
- Parameters
specified on labels of tanks and auxiliary equipment.
- Quantity
and conditions of auxiliary equipment appropriate to design.
- Inspection
of foundation conditions of tanks, auxiliary equipment, and load-bearing
mechanisms.
- Inspection
of cleaning ports, shutters: quantity, arrangement, and dimensions allowing
internal inspection of the tanks.
- Inspection
of stairs and working platforms.
- Inspection
of measuring instruments, protective equipment, and safety mechanisms:
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+
Inspection of pipe installation and connection: in order to identify conformity
regarding position, curvature, slope degree, technical specifications of pipes,
arrangement of valves, conditions of pipes, and pipe fittings.
- Inspection
of liquid-form LPG withdrawal lines. Whether emergency shut-off valves have
been installed on liquid-form LPG withdrawal line.
- Whole
LPG tank inspection:
+ In
regard to wholly-built tanks (for rapid installation): Inspect and verify that
tanks are properly handled, are not damaged, collided, or welded during transportation
and installation processes.
+ In
regard to tanks that are not wholly built and require welding and assembly at
location of use: Inspect tank assembly conditions and note assembly tolerance
according to the design.
- In
regard to used tanks that are installed in different locations, inspect
additional details in accordance with 12.4.2.
12.4.2. In
case of periodic inspection or irregular inspection
- Inspection
and comparison with fulfillment of propositions under previous inspection
records.
- Inspection
of support brackets, level of deformation and corrosion of support brackets.
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- Inspection
of working conditions of measuring instruments, protective equipment, safety
mechanisms, and signal transmission lines.
- Inspection
of conditions of measuring instruments and safety equipment of the tanks:
+
Measuring instruments are inspected on a periodic basis;
+ No
damage affects stable and accurate operation of the equipment.
- Inspection
of conditions of pipes, welded connections, flange connections, threaded
connections: Level of deformation, fracture, corrosion, leak.
- Internal
and external inspection of tank shell:
Internal
inspection shall be carried out inside of the tanks, if tank dimensions do not
allow entry, utilize techniques such as the use of lights or endoscopes.
Internal
and external tank inspection shall be carried out visually in combination with
tools such as rulers, glasses, and non-destructive techniques in order to
detect:
+ Indents,
deformation, leaks;
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+ Defects
in welded connections: cracks, burnt marks, slag inclusions, incomplete fusion,
undercuts, inadequate welded dimension, and other defects;
+
Corrosion, leak, erosion caused by chemical and mechanical factors;
+ Defects
caused by heat, electric arc, or fire;
+ Repairs
and attachments that are not appropriate.
- Inspection
of working platforms, stairs, lighting systems, and industrial hygiene where
tanks are installed.
- Measurement
of tank thickness.
Thickness
measurement of tank shell, flat sections, curved sections of tank heads,
dead-end pipes, and sections with leaks, corrosion.
- Inspection
of displacement in all directions of foundation and tanks.
12.4.3. In
case of tank inspection following renovation or major repair
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- Inspection
of criteria similar to those in the case of periodic or irregular inspection.
12.5.
Hydraulic test
- Intervals
between hydraulic tests shall not exceed 6 years; hydraulic tests shall also be
carried out in case of irregular inspection.
- Details
of hydraulic test: See 11.2.
- In
case of periodic inspection, if hydraulic test is not feasible, it is
permissible to consider the use of non-destructive techniques as alternatives
as long as they can inspect quality of welded connections, metal surfaces, and
thickness of LPG tanks.
12.6.
Airtight test
Details of
airtight test: See 11.3.
12.7.
Operation inspection
12.7.1.
Adequate inspection of conditions for bringing the system into operation
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12.7.3.
Safety valves shall be calibrated and sealed as follows:
- Installation
pressure of safety valves shall not exceed 1,15 times the maximum working
pressure of the tanks. Installation pressure of safety valves shall not exceed
1,8 MPa in case of LPG tanks or 1,08 MPa in case of butane tanks.
- Activation
pressure of safety valves installed on gas-form and liquid-form LPG line shall
be suitable with working pressure of the pipes.
Outlets of
safety valves shall be directed towards well-ventilated areas and not towards
areas occupied by people, tanks, equipment, or heat sources.
III.
Regulations
on management
1.
Regulations
on certificate of conformity
1.1. LPG
tanks, prior to being brought into operation and use, shall be declared for
conformity with regulations under Section II hereof.
1.2.
Assessment of conformity of LPG tanks shall be carried out as follows:
Method 8:
Testing or inspecting the entirety of products, goods.
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Declaration
of conformity and designation of certifying bodies for LPG tanks shall conform
to Circular No. 36/2019/TT-BCT dated November 29, 2019 of the Minister of
Industry and Trade.
3.
Responsibilities
of organizations and individuals
3.1.
Organizations and individuals designing, manufacturing, importing, testing,
owning LPG tanks and relevant organizations and individuals shall comply with
this Regulation during installation, operation, and use of LPG tanks.
3.2.
Organizations and individuals manufacturing, importing LPG tanks shall be
declared for conformity with requirements under Section II hereof, maintain
safety requirements of LPG tanks in accordance with the declaration, and fulfill
responsibilities under other relevant legislative documents.
3.3.
Organizations and individuals manufacturing, importing, owning, using LPG tanks
shall maintain product, goods quality in accordance with applicable law
provisions.
3.4.
Organizations and individuals using LPG tanks shall carry out occupational
safety and technical inspection for LPG tanks before use and on a periodic
basis during use as per the law.
4.
Organizing
implementation
4.1. The
Industrial Safety Techniques and Environment Agency shall be responsible for
cooperating with relevant agencies and entities in guiding and inspecting
implementation of this Regulation.
Depending
on management requirements, the Industrial Safety Techniques and Environment
Agency shall be responsible for requesting the Minister of Industry and Trade
to amend or replace this Regulation.
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4.3. If
legislative documents, standards, and regulations referred to under this
Regulation are amended or replaced, the new versions shall prevail./.