Rank: Forum user 
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Why is the inspection period for air receivers and LEV systems 14 months? It seems to be an unusual time period. More curious than concerned.
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Rank: Super forum user 
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I think its one of life's mysteries.
My assumtion is; annual test plus a couple of months grace for those who forgot or time needed to get the inspector in.
I always advise an annual test so as to avoid sailing too close to the wind.
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Rank: Super forum user 
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http://www.hse.gov.uk/re...rr_pdf/2002/crr02429.pdf
The requirement to thoroughly examine equipment dates back to the introduction of steam power into factories. There were a large number of explosions of steam boilers and it was found that a legal requirement to have the boilers regularly examined by a competent person did dramatically
reduce the number of these accidents. The examination of the boilers meant that the factory had to be closed down whilst this work was carried out and this normally only occurred during the Easter holidays. Because Easter was a moveable feast the maximum time set for the intervals between thorough examinations was chosen as 14 months to accommodate the holiday period.
It was then recognised that there were also a large number of accidents on cranes and other defined types of lifting machines and so a similar requirement was introduced with a similar time scale
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Rank: Super forum user 
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I have always understood there were two schools of thought on this; one of which is described by Redken below - the movement of Easter. The other school goes for the 14 month plan pushing the check back through all of the seasons as the years pass by therefore checking in a range of temperatures, etc. Take your pick!
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Rank: Forum user
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It probably emerged from the old boiler regs and said something like 'safe to use for a period of 12 months and must be reinspected within 60 days of that last day'. Pure guess, hope someone answers to satisfy my curiosity.
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Rank: Forum user
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Thanks Redken and m, I posted my last post before your two comments were uploaded.
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Rank: Forum user
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m is correct. LEVs are tested at 14 month intervals to test under different weather conditions.
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Rank: Forum user
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Thanks guys, curiosity satisfied, until the next time.
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Rank: Super forum user
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I'm confused. LEV is required to be tested at intervals not exceeding 14 months but the period of inspection for air receivers is determined by the competent person. Can't say I've known it to be 14 months, 12 months seems to be more normal.
But I have not idea why LEV uses the 14 month criteria.
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Rank: New forum user
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Sweep is correct LEV comes under COSHH and has 14 month inspection intervals to tak into account the varying weather conditions as extraction operates differently on a hot day as opposed to a cold one.
The air recivers must have a written scheme for the periodic examination by a competent person, this will determine how often the examination takes place. In my experience this is normally every 24 months for new equipment and is reduced as it gets older.
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Rank: Forum user
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For what its worth, my money is on the Easter suggestion.
If they really wanted to test LEV through all weather conditions the requirement would be for exactly 14 months (or 11, 13 or some othe number not equal to 12), as it stands the requirement is for testing at an interval not exceeding 14 months (I'm sure someone will quote the exact phraseology used)
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