Rank: Forum user 
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Does anyone know the temperature that hot water pipes can get up to before lagging, signage,etc.. is necessary?
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Rank: Super forum user
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Domestic, semi domestic or industrial?:
I do not know of a temperature the external surface is deemed to be a problem noting that pipe wall sizes are different as are materials used but you have to account for those likely to be affected as the very young and the very old have thinner skin etc so burns are more easily caused
Try the Building regs, BSEN standards, suppliers, ICE the HSE etc
Additionally any and all lagging must be useful as heat waste is very costly and silly
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Rank: Forum user
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Industrial setting, such as a boiler house.
Thick-skinned engineers.
Not possible to lag all pipework.
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Rank: Super forum user 
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Don't know if this might serve as an indicative, but the max. permitted touch temperature for vulnerable groups in in the order of 43 degrees C.
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Rank: Forum user
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As the flow or return flow temperature should be between 50C & 65C, all exposed hot pipework should, where there is a likelihood of personal, accidental contact of vulnerable people (very young, elderly or disabled) be suitably guarded.
This can either be by lagging individual pipes or by enclosing them. Bear in mind that if enclosure is used, the temperatures of cold water supply (which is usually very close to hot water routes) could be raised to temperatures of around 20C, particularly in infrequently used outlets.
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