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BigRab  
#1 Posted : 24 October 2024 13:12:43(UTC)
Rank: Forum user
BigRab

Doe anyone know the statutory examination requirements for pressurised unvented hot water systems. My own feeling is that if the capacity of the pressurised hot water tank multiplied by the pressure gives a prodcut of 250 bar litres or more than it must be examined. I cannot find anything to confirm this and the PSSR does not specify if hot water systems are included.

peter gotch  
#2 Posted : 24 October 2024 17:01:47(UTC)
Rank: Super forum user
peter gotch

Hi Rab

This is one where it would be sensible to work down the flow chart on page 9 of the ACOP/guidance on PSSR.

Safety of pressure systems: Pressure Systems Safety Regulations 2000. Approved Code of Practice L122

However, my instinct says that if the water is at more than 0.5 bar and the total energy exceeds 250 bar L, then it falls within scope.

BigRab  
#3 Posted : 25 October 2024 12:09:41(UTC)
Rank: Forum user
BigRab

Thanks for your advice Peter.

Yes, I think it does fall within the requirement for a statutory examination except that it depends whether the water in the systems is a "relevant fluid". 

According to the HSE a relevant fluid is: 

  • steam at any pressure
  • compressed or liquefied gas, including air, at a pressure greater than 0.5 bar above atmospheric pressure; pressurised hot water above 110 °C
  • a gas dissolved under pressure in a solvent (acetylene)

So I think I have found the answer to my particular problem. The client is a nursing home so the water in the system will be below boiling point and is therefore exempt from the requirement for a statutory examination.

A Kurdziel  
#4 Posted : 25 October 2024 12:37:21(UTC)
Rank: Super forum user
A Kurdziel

It’s the temperature of the water in the calorifier that counts not the temperature in the pipework. Some  systems can heat water to that sort of temperature before sending it out.

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