ISO 15364:2000
(Main)Ships and marine technology — Pressure/vacuum valves for cargo tanks
Ships and marine technology — Pressure/vacuum valves for cargo tanks
Navires et technologie maritime — Robinets à pression/à vide pour citernes de chargement
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 15364
First edition
2000-09-01
Ships and marine technology —
Pressure/vacuum valves for cargo tanks
Navires et technologie maritime — Robinets à pression/à vide pour
citernes de chargement
Reference number
ISO 15364:2000(E)
©
ISO 2000
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ISO 15364:2000(E)
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ISO 15364:2000(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Ordering information.2
5 Materials .2
6 Other requirements.3
7 Approval tests.4
8 Inspection.5
9 Certification.5
10 Marking .6
11 Quality assurance.6
12 Flow tests .6
Annex A (normative) Installation requirements for ships subject to the International Convention for
the Safety of Life at Sea, 1997 (SOLAS) .8
Annex B (informative) Materials selection guidelines.9
Annex C (informative) Corrosion protection guidelines .10
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ISO 15364:2000(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 15364 was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 3, Piping and machinery.
Annex A forms a normative part of this International Standard. Annexes B and C are for information only.
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INTERNATIONAL STANDARD ISO 15364:2000(E)
Ships and marine technology — Pressure/vacuum valves for cargo
tanks
1 Scope
This International Standard applies to pressure/vacuum relief valves protecting marine vessel systems, including
cargo tanks, that may be subject to gas/vapour pressure or vacuum outside the design parameters of the
system/tank. This standard specifies the minimum requirements for performance and testing of pressure/vacuum
relief valves, with emphasis on selection of materials, internal finish and surface requirements for pressure/vacuum
valves installed on cargo tanks in tankers (see annex A). This standard specifies design and in-service
performance criteria and operational testing and maintenance requirements. This standard does not address
devices to prevent the passage of flame. Advice on devices to prevent the passage of flame is found in the
International Maritime Organization (IMO) “International Convention on the Safety of Life at Sea, 1997” (SOLAS);
Chapter II-2, Regulation 59, and IMO Maritime Safety Committee (MSC) Circular No. 677 (MSC/Circ. 677)
“Revised Standards for the Design, Testing and Locating of Devices to Prevent the Passage of Flame into Cargo
Tanks in Tankers”.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
International Maritime Organization, Maritime Safety Committee Circular 677 (MSC/Circ. 677), “Revised Standards
for the Design, Testing and Locating of Devices to Prevent the Passage of Flame into Cargo Tanks in Tankers”.
International Maritime Organization, Assembly Resolution A.746(18), “Survey Guidelines under the Harmonized
System of Survey and Certification”.
International Maritime Organization, “International Convention on the Safety of Life at Sea, 1997” (SOLAS);
Chapter II-2, Regulation 59.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
administration
the government of the state whose flag the ship is entitled to fly
3.2
flame arrester
device to prevent the passage of flame in accordance with a specified performance standard
NOTE Its flame-arresting element is based on the principle of quenching.
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ISO 15364:2000(E)
3.3
flame screen
device utilizing wire mesh to prevent the passage of unconfined flames in accordance with a specified performance
standard
3.4
passive flame stopper
device, such as a flame screen or a flame arrester, that operates passively to prevent the passage of unconfined
flames in accordance with a specified performance standard
3.5
high-velocity vent
device to prevent the passage of flame consisting of a mechanical valve which adjusts the opening available for
flow in accordance with the pressure at the inlet of the valve in such a way that the efflux velocity cannot be less
than 30 m/s (98 ft/sec) under all flow rates and the actual conditions of installation
3.6
pressure/vacuum valve
device to prevent the occurrence of over- or underpressure in a closed container
3.7
standard air
dry air at 21 °C(70 °F) and 1 013,25 hPa (29,92 inHg) pressure
3 3
NOTE This is substantially equivalent to air with a density of 1,2 kg/m (0,075 lb/ft ). The specific heat of dry air is
1 004,8 J/kg�K (0,24 btu/lb/°F).
3.8
third-party inspection body
an organization designated by the administration that is independent of the manufacturer and the user and that
performs or witnesses the tests and inspections provided for by this International Standard
4 Ordering information
Orders for devices under this specification shall include the following information, as applicable:
� Nominal pipe size, configuration of pipe, and pipe length.
� Molecular mass and specific heat ratio of each gas or vapour in the tank being protected, and maximum
explosive safe gap (MESG) value, if known.
� Inspections and tests other than those specified by this International Standard (see clause 8).
� Set opening points for pressure and vacuum.
� Anticipated ambient air temperature range.
� Materials of construction (see clause 5).
� Maximum flow rate for standard air and the design pressure drop for the piping system at that maximum flow
rate, and the maximum allowable tank pressure and tank vacuum.
5 Materials
5.1 The device housing, and other parts or bolting used for pressure retention, shall be constructed of materials
suitable for the intended service and listed in a recognized national or international standard.
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ISO 15364:2000(E)
5.1.1 Housings, discs, spindles, seats, springs, gaskets, seals, passive flame stoppers (when included in the
design) and all other integral parts, including parts with coatings to prevent corrosion, shall be made of materials
resistant to attack by seawater and the liquids and vapours contained in the tank being protected (see annex C).
5.1.2 Springs plated with corrosion-resistant material are not acceptable.
5.2 Non-metallic materials, other than gaskets and seals, shall not be used in the construction of pressure-
retaining components of the device.
5.2.1 Resilient seals may be installed only if the device is still capable of effectively performing its function when
the seals are partially or completely damaged or burned.
5.2.2 Non-metallic gaskets shall be made of non-combustible material suitable for the service intended.
5.3 Materials for connecting pressure/vacuum valves to their respective piping systems shall meet standards for
physical characteristics similar to those of the piping systems to which they are connected.
5.4 The materials of all parts not identified above shall be suitable for their intended purpose.
5.5 The possibility of galvanic corrosion shall be considered in the selection of materials.
6 Other requirements
6.1 Device housings shall be gastight in the primary pressure zone upstream of the main valve seat to prevent
the escape of vapours.
6.2 Housings, elements and seal gasket materials shall be capable of withstanding the maximum and minimum
pressures and temperatures to which the device may be exposed under normal operating conditions, and shall be
capable of withstanding the hydrostatic pressure test of 7.2.2.
6.3 Where welded construction is used for pressure-retaining components, welded-joint design details, welding
and non-destructive testing shall be in accordance with national or international standards. Welders and weld
procedures shall be qualified by a recognized organization to ensure consistent-quality production of weld joints
that are sound and of proper strength, in accordance with recognized national/international standards.
6.4 When pressure/vacuum relief valves are designed to allow for inspection, cleaning, repair or removal of
internal elements for replacement without removing the entire device from the system, the design shall not allow
the valve to be incorrectly reassembled following disassembly for inspection, cleaning or repair.
6.5 Pressure/vacuum valves shall be designed such that condensed vapour drains from the device and does not
impair the efficiency of the device. The design shall also prevent the accumulation of water inside the device and
subsequent blockage due to freezing.
Where the design does not permit complete drainage of condensed vapours through its connection to the tank, the
housing shall be fitted with a plugged drain opening on the side of the atmospheric outlet of not less than 13 mm
[1/2 inch nominal pipe size (NPS ½)]. The drain shall not allow vapour to escape unless the drain is equipped with
suitable means to prevent the passage of flame and meets all requirements for efflux velocity and direction.
6.6 All fastenings essential to the operation of the device shall be protected against loosening.
6.7 Devices shall be designed and constructed to minimize the effect of fouling under normal operating
conditions. The design shall be such that the device can be examined for any build-up of residue due to vapour
condensation that might impair the operation of the device. The manufacturer’s operating manual shall include
instructions on how to determine when cleaning is required and shall specify the method for cleaning (see
clause 9). For certain cargoes that crystallize, heating arrangements may be necessary.
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ISO 15364:2000(E)
6.8 Devices shall be capable of operating over the full range of ambient air temperatures anticipated. Devices
shall be capable of operating in freezing conditions (such as may cause blockage by freezing cargo vapours or by
icing in bad weather) and when covered by a layer of ice, the allowed thickness of which shall be stated by the
manufacturer in the operating manual. Devices shall also be capable of operating at whatever surface temperature
is developed by heating arrangements.
6.9 End-of-line devices shall be constructed to direct the efflux vertically upward under all flow rates intended by
the manufacturer.
6.10 A manual means shall be provided to verify that any valve lifts easily and cannot remain in the open position,
as per manufacturer’s instructions. The design shall be such that the device shall not be rendered inoperable due
to corrosion, residue build-up or icing, when maintenance is carried out in accordance with the manufacturer’s
requirements (see annex C).
6.11 Valve discs shall be guided by a suitable means to prevent binding and ensure proper self-closing (seating),
taking into account the possible build-up of condensed vapours passing through the valve during loading, when
maintenance is carried out in accordance with the manufacturer’s requirements.
Valve discs shall normally close against the valve seat by metal-to-metal contact. Resilient-seating seals may be
provided if the design is such that the disc closes tight against the seat in case the seals are destroyed, damaged
or otherwise carried away.
Valve discs may be solid or made hollow so that weight material may be added to vary the lifting pressure. If hollow
discs are employed, a watertight bolted cover shall be fitted to encase the weight material. The lifting pressure shall
not be varied by personnel other than the manufacturer without prior approval by the administration. A clear
indication, visible from the outside of the valve, shall be employed to indicate the position of the valve. If the lifting
pressure is varied, the marking required by clause 10 shall be updated.
6.12 Valves may be actuated by non-metallic diaphragms except where failure would result in unrestricted flow of
tank vapours to the atmosphere or in an increase in the pressure or vacuum at which the valve normally releases.
6.13 Relief pressure adjusting mechanisms shall be permanently secured by lockwire, locknuts or other suitable
means to prevent devices from becoming misadjusted due to handling, installation or vibration.
7 Approval tests
7.1 Type approval tests shall be conducted by a laboratory acceptable to the administration. The manufacturer,
in choosing a laboratory, shall ensure that the laboratory is qualified (by the administration or by a certifying entity
designated by the administration) to conduct the tests provided for by this International Standard and that the
laboratory has (or has access to) the apparatus, facilities, personnel and calibrated instruments that are necessary
for the tests. Alternatively, the tests provided for by this International Standard may be conducted by the
manufacturer when the tests are witnessed by a third-party inspection body designated by the administration who
can certify that the tests are conducted properly.
7.2 One device of each model and each size shall be tested. A change of design, material or construction that
affects the corrosion resistance, or any change that alters th
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