Wednesday, January 9, 2013
Difference Between ia & ib Intrinsic Safety Protection
Difference Between ia & ib Intrinsic Safety Protection
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ProtectionType
ia
Apparatus is designed so that it is
suitable for Zone 0 & it will not cause ignition when the maximum permitted
values are applied to its terminals:
a)
in
normal operation with application of those non-countable faults which give the
most
onerous
condition;
b)
in
normal operation with application of one countable fault and those
non-countable faults
which
give the most onerous condition; and
c)
in
normal operation with application of two countable faults and those
non-countable faults which give the most onerous condition.
Labels: difference between ia and ib protection, hazardous area, ia, ia category, ib, intrinsic safe circuit, Intrnsic safety, level of protection ia apparatus, level of protection ib apparatus
EPC Q & A
E for EPC
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1.
Describe
the data sheet development work flow process.
Start with Rev A and the discipline
activity and describe all the way to Rev 0.
2.
When
an engineering department receives a document for the first time, what is the first item on
your ‘to-do’ list and why?
3.
For
client, are drawings reviewed in parallel or in series and why?
4.
When
we receive approvals from client and experts for welding documents / inspection
/ drawings, what is one thing that must be on the drawings before returning to
vendor and Why?
Labels: client, engineering consultant, epc, epc procedures, EPC School, project management, Questions, vendor
Thermowell
Thermowell
When fluid flows past a thermowell inserted into a pipe or duct, vorticies form at both sides of the well. These vorticies detach, first from one side, and then from the other. This phenomenon is known as the Von
Karmann effect. The frequency of shedding of these vortices is a function of the diameter of the thermowell,
the fluid velocity and, to a lesser extent, the Reynolds number.
Labels: field instrument, temperature, thernowell, von karmanm, wake frequency
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