Rank: Forum user 
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Hi,
A quick query, following a breakdown of some plant equipment in a Zone 2 area, we are sourcing replacement equipment.
Our best option is to get separate Pump and Motor and install on site.
These are both obviously correctly rated and certified under these regulations for this area.
My query is, once the installation is complete does the unit as a whole require certification, or does the fact that all component parts are appropriately rated satisfy regulatory requirements.
Thanks for your help in advance.
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Rank: Super forum user 
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I'm guessing all connections will need to be tested.
It worries me you might fit it on the advice of a forum post - I think you need the advice of a competent chemical engineer / electrician.
What does the manufacture say?
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Rank: Forum user
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Oh God no !
Don't worry about me basing a decision like that on the basis of a forum alone !
I was just getting advice from a separate source for more information and opinions !
We are waiting for both our electrician to come in to have a chat and our engineer and having discussions with suppliers of the items.
All while I re-read the legislation and have a think over a nice cup of coffee :)
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Rank: Super forum user
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If you have recognised the need for the replacement pump/motor to be suitable for a Zone 2 environment - then keep the certification provided with the new pump & motor.
I don't see a need for additional testing etc - other than any normal post maintenance checks etc - flow rates, leak checking, direction of rotation, corect assembly & locking etc.
Update of local records/procedures etc
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Rank: Super forum user
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Adrian STACI wrote:Oh God no !
All while I re-read the legislation and have a think over a nice cup of coffee :) :) Just checking - well it is Friday,
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Rank: Super forum user 
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Just make sure that the persons involved in the work are suitably qualified & competent also! ;)
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Rank: Forum user 
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I would say no, the component parts may be ATEX compliant for a zone 2 area but the method of combining them might need a re assessment.
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Rank: Forum user
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Maybe I should qualify that statement a bit, for example flange failure, new equipment running temperatures, surface area temperatures. ATEX area classification is a dark art, but without knowing what your equipment is pumping it's not possible to give you a good advice except to always err on the side of caution
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Rank: Super forum user
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The running temperature should have already been assessed as part of the selection/specification procedure for the motor/pump combination.
It will be rated as T1-T6 (T6 being the lowest surface temperature 85C and T1 the highest 450C)
The required temperature class will depend upon what the pump is pumping.
I would allow about a 20C tolerance for the temperature class.
ATEX ratings are not a black art - the various standards tell you how to do it.
BS60079-20-1 Explosive Atmospheres - Material Characteristics tell you the T rating for a particular substance.
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