dsen 60079-10-1 & uk.pdf
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HAZARD U AREACLASSIFICATIONDS/EN 60079-10-1 & UK
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BACKGROUND – DS/EN 60079-10-1
–
• rec ve ore o e rec ve o s ore
• Danish Regulations (BEK 1480 + Guideline to that)
• Norway: PSA Facilities Regulation (Guideline) points towards IEC
61872-7 – which points towards IEC/EN 60079-10-1-
•
• Classify for flammable gasses, vapours and mists
• Flammability: Dependent on flash point and design/service
temperature
Probability for fire/explosion:
P(Release) x P(Ignition)
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AREA CLASSIFICATION – ZONING
EN 60079-10-1 / IP 15
Zone 0: The part of a hazardous area in which aflammable atmosphere is continuously present orpresent for long periods
Zone 1: That part of a hazardous area in which aflammable atmosphere is likely to occur in normal
Zone 2: That part of a hazardous area in which aflammable atmos here is not likel to occur in normaloperation, and if it occurs, it will only exist for a shortperiod
Non-hazardous: areas that do not fall into any ofthe above (IS NOT ‘SAFE AREA’)
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Definitions – EN 60079-10-1
• Source of Release: A point of location from which a gas, vapour,
mist or liquid may be released into the atmosphere so that an
explosive gas atmosphere could be formed.
• Grades of release: There are three basic grades of release, as
explosive gas atmosphere being present:
• Continous grade
• Primary Grade
• Secondary Grade
• Degree of ventilation (natural / artificial):
• Hi h ventilation VH
• Medium ventilation (VM)
•
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HAZARDOUS AREA CLASSIFICATION –
GRADE OF RELEASE – IP 15 DEFINITIONS
Continuous gra e re ease: A re ease t at is continuous or near y so, orthat occurs frequently and for short periods
If it is likel to be resent for more than 1000 hours er ear.
Primary grade release: a release that is likely to occur periodically oroccasionally in normal operations, i.e. a release which, in operating
procedures is anticipated to occurIf it is likely to be present for between 10 to 1000 hours per year.
Secondary grade release: A release that is unlikely to occur innormal operation and, in any event, will do so only infrequently and
. .anticipated to occur. Such release may be of unknown size e.g.fracture of a drain or unknown size e.g. corrosion hole.
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ZONE – VENTILATION – GRADE OF RELEASE
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Hazardous Area Classification Data Sheets
Part I: Flammable Material List and data
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Hazardous Area Classification Data Sheets
Part II: List of sources of release
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Hazardous Area Classification Drawings
EN 60079-10-1, SEC 7.2
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WHY COMBINE EN 60079-10-1 WITH IP15
• For continous & primary grades of release, the leak size is
typically known.
• We need some advise regarding size and types of leak sources for
secondary grade of release – EN 60079-10-1 is very open on the.
• e . to - - , . cope:
For detailed recommendations regarding the extent of thehazardous areas in specific industries or applications, reference
may be made to national or industry codes relating to thoseapplications.
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HAZARDOUS AREA CLASSIFICATION – IP 15
Risk Target is 10-5 year
For most offshore plants, where there is control of ignition sources
outside the hazardous areas, IP 15’s LEVEL I is applied
Does not concern major releases (spread of flamables morethan 30 m). These shall be minimised by design and operation
.
IP 15, sec. 5.4.5.1: “ As a guide, when there are more than 10 leak. .
overlap), the area should be classified as zone 2”
deg. C to the handling/ambient temperature in the area.
Followin : O en field naturall ventilated wind s eed 0.5 – 2.0 m s
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POINT SOURCE
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FLUID CATEGORY / CLASS
Fluid
Category
Description
A A flammable liquid that, on release, would vaporise rapidly and
substantially.
B A flammable liquid, not in Category A, but at a temperature
sufficient for boiling to occur on release.
C A flammable liquid, not in Categories A or B, but which can, onrelease be at a tem erature above its flash oint or form a
flammable mist or spray.
G(i) A typical methane-rich natural gas.
G(ii) Refinery hydrogen.
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FLUID CATEGORY - EXAMPLES
Fluid Category
Condensate / LPG: A
Crude / unstabilized: BCrude / stabilized: C
Wet/dry gas: G(i)
Diesel: C
Helifuel: C
Hydraulic oil: C
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RELATIONSHIP – CLASS & CATEGORY
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IP 15 PROCEDURE – SECONDARY GRADE
RELEASE
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IP 15 – LEVEL I, II & III – FLANGES & VALVES
For offshore oil/gas installations, where there is a strong control of
,
selected.
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CLASSIFICATION AT SPECIFIC EQUIPMENT
Fig 1A. Pump mounted on plated deck – high integrity pump (typically double mechanical seals)
HOLEDIA
FLUIDCAT.
PRESSUREBARG
RADIUSR1 R2
2 B 10
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CLASSIFICATION AT SPECIFIC EQUIPMENT
Fig. 1B, Pump mounted on grated deck – high integrity pump (typically double mechanical seals)
HOLE FLUID PRESSURE RADIUSDIA CAT. BARG R1 R2
2 B P
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CLASSIFICATION AT SPECIFIC EQUIPMENT
Fi . 2A Flan e valve installed over rated deck
HOLE
DIA
FLUID
CAT.
PRESSURE
BARG
RADIUS
R1 R2
1 A / C P
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CLASSIFICATION AT SPECIFIC EQUIPMENT
Control valves, often used block valves and valves not well maintained: A zone 1=
A specific evaluation shall be made to decide if there is a further zone 2 around thezone 1.
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CLASSIFICATION AT SPECIFIC EQUIPMENT
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CLASSIFICATION AT SPECIFIC EQUIPMENT
EN 1127-1, ANNEX BDefines equipment which are ”durably technically tight”,
• Canned motor pumps
examples:
• Magnetic coupled sealless pumps
• Ton ue roove flan es EN 1092-1 T e C & D
• If rarely detached: NPT connections (up to DN 50)
Should normally not cause classified areas.
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CLASSIFICATION AT SPECIFIC EQUIPMENT
Seal Sealing Arrangement DescriptionMax. Release Flow Rate
(kg/s)
Hazard Radius R1/R2
(m)
John Crane recommendations for mechanical seal Maximum release flowrates for pumps in all fluid categories and process pressuresITA / Appendix 5:
Single
Single seal ( without fixed throttle
bushing, in a pump with no wear
rings). This may be a component or
cartridge, general-purpose seal
Use IP-15 calculation ( Hole
size. 0,23xshaft dia.)*See IP-15
Single
Single seal with a fixed throttle
bushing or a single seal in an API
610 pump. This may be acomponent or cartridge, general-
0,0003
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HAZARDOUS AREA DOSSIER
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ENCLOSED AREAS
• Minimum 12 ACH (IP 15), no stagnant zones to ensure area
classification will correspond to grade of release.
• Pressurisation to safe a room adjacent to classified area: Min. 5
mm WG overpressure (IP 15)
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