ISO 6182-6:2006
(Main)Fire protection — Automatic sprinkler systems — Part 6: Requirements and test methods for check valves
Fire protection — Automatic sprinkler systems — Part 6: Requirements and test methods for check valves
ISO 6182-6:2006 specifies performance requirements, methods of test and marking requirements for check valves used in automatic fire protection systems.
Protection contre l'incendie — Systèmes d'extinction automatiques du type sprinkler — Partie 6: Exigences et méthodes d'essai des postes de contrôle
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6182-6
First edition
2006-03-01
Fire protection — Automatic sprinkler
systems —
Part 6
Requirements and test methods for check
valves
Protection contre l'incendie — Systèmes d'extinction automatiques du
type sprinkler —
Partie 6: Exigences et méthodes d'essai des postes de contrôle
Reference number
ISO 6182-6:2006(E)
©
ISO 2006
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ISO 6182-6:2006(E)
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ii © ISO 2006 – All rights reserved
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ISO 6182-6:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Requirements . 3
5 Production testing and quality control. 8
6 Tests. 8
7 Marking . 12
8 Instruction chart. 13
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ISO 6182-6:2006(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6182-6 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 5, Fixed firefighting systems using water.
ISO 6182 consists of the following parts, under the general title Fire protection — Automatic sprinkler systems:
⎯ Part 1: Requirements and test methods for sprinklers
⎯ Part 2: Requirements and test methods for wet alarm valves, retard chambers and water motor alarms
⎯ Part 3: Requirements and test methods for dry pipe valves
⎯ Part 4: Requirements and test methods for quick-opening devices
⎯ Part 5: Requirements and test methods for deluge valves
⎯ Part 6: Requirements and test methods for check valves
⎯ Part 7: Requirements and test methods for early suppression fast response (ESFR) sprinklers
⎯ Part 8: Requirements and test methods for pre-action dry alarm valves
⎯ Part 9: Requirements and test methods for water mist nozzles
⎯ Part 10: Requirements and test methods for domestic sprinklers
⎯ Part 11: Requirements and test methods for pipe hangers
⎯ Part 12: Requirements and test methods for grooved end pipe couplings
⎯ Part 13: Requirements and test methods for extended coverage sprinklers
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ISO 6182-6:2006(E)
Introduction
This part of ISO 6182 is one of a number of ISO International Standards prepared by ISO/TC 21 covering
components for automatic sprinkler systems, including the following:
a) carbon dioxide systems (ISO 6183),
b) explosion suppression systems (ISO 6184),
An International Standard covering foam systems is planned.
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INTERNATIONAL STANDARD ISO 6182-6:2006(E)
Fire protection — Automatic sprinkler systems —
Part 6:
Requirements and test methods for check valves
1 Scope
This part of ISO 6182 specifies performance requirements, methods of test and marking requirements for check
valves used in automatic fire protection systems.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Designation, dimensions
and tolerances
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 898–1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws
and studs
ISO 898–2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse
thread
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
check valve
valve that permits flow of water in one direction and prevents the flow of water in the reverse direction
NOTE These valves are manufactured with pipe connections or may be of the wafer type.
3.2
clapper
type of sealing element
NOTE See 3.8.
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ISO 6182-6:2006(E)
3.3
corrosion-resistant material
1)
bronze, brass, Monel metal, austenitic stainless steel, or equivalent, or plastic material conforming with the
requirements of this document
3.4
flow velocity
speed of water flow through a valve expressed as the equivalent water velocity through a pipe of the same
nominal size as the valve
3.5
rated working pressure
maximum service pressure at which a valve is intended to operate
3.6
ready condition
set condition
state of a valve with the sealing assembly in the closed or set position with service and system pressure
applied
3.7
reinforced elastomeric element
element of clapper, clapper assembly or seat seals in a composite of an elastomeric compound with one or
more other components
3.8
sealing assembly
main movable sealing element (such as a clapper) of the valve, which prevents the reverse flow of water and
which maintains air pressure in the system piping
3.9
sealing assembly seat ring
main fixed sealing element of a valve which prevents the reverse flow of water and which maintains air
pressure in the system piping
3.10
service pressure
static water pressure at the inlet to a valve when the valve is in the ready condition
3.11
wafer check valve
valve having outside body and end connection dimensions that are less than the inside diameter of the bolt
pattern of flanges of the same nominal size
NOTE One set of flange studs long enough to span the valve is used to clamp the wafer check valve between the
mating pipe flanges.
1) Monel is an example of a suitable product available commercially. This information is given for the convenience of
users of this part of ISO 6182 and does not constitute an endorsement by ISO of this product.
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ISO 6182-6:2006(E)
4 Requirements
4.1 Nominal sizes
The nominal size of a check valve shall be the nominal diameter of the inlet and outlet connections, i.e., the
pipe size for which the connections are intended. The sizes shall be: 25 mm, 32 mm, 40 mm, 50 mm, 65 mm,
80 mm, 100 mm, 125 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm or 400 mm. The diameter of the
waterway through the sealing assembly seat ring may be less than the nominal size.
4.2 Connections
4.2.1 All connections shall be designed for use at the rated working pressure of the valve.
4.2.2 The dimensions of all connections shall conform with applicable requirements to International
Standards. If International Standards are not applicable, national standards shall be permitted to be used.
4.3 Rated working pressure
4.3.1 The rated working pressure shall be not less than 1,2 MPa (12 bar).
4.3.2 Inlet and outlet connections may be machined for lower working pressure to match installation
equipment provided the valve is marked with the lower working pressure.
4.4 Body and cover
4.4.1 The body and cover shall be made of a material with a corrosion resistance at least equivalent to cast
iron.
4.4.2 Cover fasteners shall be made of steel, stainless steel, titanium, or other materials with equivalent
physical and mechanical properties.
4.4.3 If non-metallic materials (other than gaskets and seals) or metals with a melting point of less than
800 °C, form part of the body or cover, the valve assembly shall be subjected to a fire exposure test as
specified in 6.9. Following the fire exposure test, the sealing assembly shall open freely and fully and the valve
shall withstand a hydrostatic pressure test as specified in 6.7.1 permanent deformation or failure.
4.4.4 It shall not be possible to assemble a valve with the cover plate in a position which either improperly
indicates flow direction or prevents proper operation of the valve.
4.4.5 A valve weighing more than 25 kg shall be provided with an access cover, lifting lug or eyebolt to
facilitate servicing.
4.5 Strength
4.5.1 An assembled valve, with the sealing assembly blocked open, shall withstand, without rupture, an
internal hydrostatic pressure of four times the rated working pressure, for a period of 5 min when tested in
accordance with 6.7.1.
4.5.2 The calculated design load of any fastener, neglecting the force required to compress the gasket,
shall not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2, when the valve is
pressurized to four times the rated working pressure. The area of the application of pressure shall be
calculated as follows.
a) If a full-face gasket is used, the area of force application is that extending out to a line defined by the
inner edge of the bolts.
b) If an “O”-ring seal or ring gasket is used, the area of force application is that extending out to the
centreline of the “O”-ring or gasket.
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ISO 6182-6:2006(E)
4.6 Access for maintenance
Means shall be provided to permit access to working parts and the removal of the sealing assembly. Any method
adopted shall permit ready maintenance by one person with a minimum of down time.
4.7 Components
4.7.1 Any component that is normally disassembled during servicing shall be designed so that it can not be
reassembled improperly without providing an external visual indication when the valve is returned to service.
4.7.2 With the exception of the valve seats, all parts intended for field replacement shall be capable of being
disassembled and reassembled using tools normally employed by the trade.
4.7.3 All components shall be non-detachable during normal operation of the valve.
4.7.4 Failure of the sealing assembly seals shall not prevent the valve from opening.
4.7.5 Seat surfaces of sealing assemblies shall have corrosion resistance equivalent to bronze and have
sufficient width of surface contact to withstand ordinary wear and tear, rough usage, compression stresses
and damage due to pipe scale or foreign matter carried by the water.
4.7.6 Springs shall not fracture or rupture during 50 000 cycles of normal operation when tested in
accordance with 6.2.
4.7.7 When wide open, the sealing assembly shall bear against a definite stop. The point of contact shall be
located so that impact or the reaction of the water flow does not permanently twist, bend or fracture the valve
parts.
4.7.8 Where rotation or sliding motion is required, the part or its bearing shall be made of corrosion-
resistant material. Materials lacking corrosion resistance shall be fitted with bushings, inserts, or other parts
made of corrosion resistant materials at those points where freedom of movement is required.
4.8 Leakage
4.8.1 There shall be no leakage, permanent distortion or rupture of a valve when an internal pressure of
twice the rated working pressure is applied for a period of 5 min with the sealing assembly open when tested
in accordance with 6.7.1.
4.8.2 There shall be no leakage, permanent distortion or rupture of a valve at an internal pressure of twice
the rated working pressure applied at the downstream end with the sealing assembly closed for a period of
5 min and the upstream end vented when tested in accordance with 6.7.2.
4.8.3 There shall be no leakage, permanent distortion or rupture of a valve at an internal pressure
equivalent to the head of a column of water 1,5 m high when applied at the downstream end with the sealing
assembly closed for a period of 16 h and the upstream end vented when tested in accordance with 6.7.3.
4.9 Non-metallic components (excluding gaskets and seals)
4.9.1 After ageing of its non-metallic parts as described in 6.4 and 6.5 using separate sets of samples, a
valve shall meet the requirements of 4.8 when tested in accordance with 6.7.2.
4.9.2 There shall be no cracking, warping, creep, or other signs of deterioration that can preclude the
proper operation of the valve.
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ISO 6182-6:2006(E)
4.10 Sealing assembly elements
4.10.1 A seal made of elastomeric or other resilient materials shall not adhere to the mating surface when
tested in accordance with 6.3.1. Where the same design of seat is used for more than one size of valve, it
shall be permitted to test only the size with the highest stress on the seating surface.
4.10.2 Any non-reinforced elastomer forming the seal shall have the following properties when tested in
accordance with 6.3.2 and the appropriate sections of ISO 37:
a) maximum set of 5 mm when 25 mm long marks are stretched to 75 mm, held for 2 min, and measured
2 min after release;
b) either
1) minimum tensile strength 10 MPa (100 bar) and minimum ultimate elongation 300 % (25 mm to
100 mm), or
2) minimum tensile strength 15 MPa (150 bar) and minimum ultimate elongation 200 % (25 mm to
75 mm);
c) after exposure to oxygen for 96 h at (70 ± 1,5) °C and 2,0 MPa (20 bar), the tensile strength and ultimate
elongation shall not be less than 70 % of the corresponding properties of specimens which have not been
heated in oxygen, and any change in hardness shall not be greater than 5 type-A durometer units;
d) after immersion in distilled water for 70 h at (97,5 ± 2,5) °C, the tensile strength and ultimate elongation
shall not be less than 70 % of the corresponding properties of specimens which have not been heated in
water and the change in volume of the specimens shall not be greater than 20 %.
4.10.3 A reinforced elastomeric sealing element shall be capable of being flexed without cracking or breaking
and shall have a change in volumetric expansion not greater than 20 % when tested in accordance with 6.3.3.
4.10.4 Sealing surfaces shall prevent leakage of water when the valve is tested in accordance with 6.9.
4.10.5 For a composite of an elastomeric compound with one or more other components, the tensile strength
of the combination shall be at least twice that of the elastomeric material alone.
4.11 Clearances
4.11.1 The radial clearance between a hinged sealing assembly and the inside walls in every po
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