This article is about Aramco Standard Equipment
Classification, Ingress rating, Temperature rating and focusing to the
engineers, technicians and supervisors. You will find lot of documents related
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Aramco Standard Equipment
Classification, Ingress rating, Temperature rating
Q: What
does “BASEEFA” stand for …..?
A: British approval
service for electrical equipment in flammable atmospheres.
Q: Explain
the meaning of: (a) Zone 0 (b) Zone 1 (c) Zone 2 (d) Non-Hazardous.
A: (a) – In which an
explosive gas-air mixture is continuously present or present for long period.
(b)- In which as
explosive gas air mixture is likely to occur under normal operation.
(c)- In which an
explosive gas-air mixture is not likely to occur in normal operation and if it
occurs it exist only for short time.
(d)- An area
which by implication is any area not classified as zone 0, 1 or 2. i.e.control
or switch room that is pressurized (HVAC) or an area that has no hydrocarbon
inventory.
Q: Explain
the type of protected equipment is required in the flowing zones: (a) Zone 0
(b) Zone 1 (c) Zone 2
A: (a) – Ex-ia, Ex-s:
Must be specifically certified for zone 0 use.
(b) –Any type of
equipment suitable for zone 0, Ex-ib, Ex-d, Ex-p, Ex-e.
(c)– Any type of
equipment suitable for zone 0 and 1, Ex-n, Ex-o, Ex-q.
Equipment Classification:
Q: Explain
the EEx ‘d’ iiB T6
A: EEx: Electrical
Explosion Proof
iiB: Gas Group
(Ethan)
T6: 85 oC
Q: Explain the type meaning of Ex-ia and Ex-ib.
A: Ex-ia is equipment
that can withstand up to 2 faults in the circuit and still maintain is the
protection.
Ex-ib is equipment
that can withstand 1 fault in the circuit and still maintain protection.
Q: Explain
the type meaning of Ex-s.
A: Special protection
(Proven by a series of approved tests to suitable for use)
Q: Explain
the type meaning of Ex-d.
A: Flameproof (will
withstand and internal explosion out damage or allowing any flammable gasses
outside the enclosure to ignite).
Q: Explain
the type meaning of Ex-e.
A: Equipment that has
been designed to give increases security against the possibility of sparks or
excessive temperatures.
Q: Explain
the type meaning of Ex-n.
A: Non sparking
equipment.
Q: Explain
the type meaning of Ex-p.
A: Pressurization /
Continuous dilution (Purge).
Q: Explain
the type meaning of Ex-o.
A: Oil Immersion.
Q: Explain
the type meaning of Ex-m.
A: Encapsulation /
hermetically sealed.
Q: Explain
the type meaning of Ex-q.
A: Sand filled.
Ingress Ratings:
Q: Explain
the meaning of “Ingress Protection”
A: The appliances
ability to keep out solids and liquids, IE Dust, Sand and Water. The first
number indicates the protection against solids and the second number indicates
the protection against liquids.
Q: Is it allowable to modify an EEx “d” gland to fit and
entry in an EEx “d” enclosure...?
A: No.
Q: State
the minimum amount of threads needed to be installed on an Ex‘d’ cable gland..?
A: (1) – 5 full
threads (minimum length 8 mm) for gas group 2B apparatus.
(2) –6 full
threads (minimum length 9.5 mm) for gas group 2C apparatus.
Temperature Rating of
Equipment:
Q: Explain
what is meant by “Temperature Classification of Equipment for use in Hazardous
areas”).
A: It is the highest
surface temperature that an appliance can attain under the worst condition
(incl. overloads) which is able to produce an ignition of any flammable gasses
in the surrounding area.
- T1= 450 oC
- T2= 300 oC
- T3= 200 oC
- T4= 135 oC
- T5= 100 oC
- T6 = 085 oC