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| RFT Member Since: 13 Nov 2010 Location: Cheshire Posts: 678   
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Re the question ref Pressure Vessel Regulations.
As I assume you are modifying an existing system, if so you need to be compliant with the Pressure System Safety Regulations https://www.hse.gov.uk/pressure-systems/pssr.htm And for the design and supply of a new system the pressure system (safety) regulations will apply. https://www.legislation.gov.uk/uksi/2016/1105/contents Needless to say these impose very complex controls on high pressure and high hazard systems (my world is oil & gas) but for lower pressure, small volume, low hazard fluids the controls tend to rely on “sound engineering practice” often covered by training and competence, as such it is alway best to use skilled and competent installers using conventional and proven technology. 130 Puma HCPU with an Artica 240LR Demountable Camper |
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17th Aug 2022 10:05pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298  
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thank you very much. not read all of the HSE / ACOP but suspect the following is what is most relevant;
Any repair or modification (including extensions or additions) should be designed in accordance with appropriate standards, taking into account the expected future duty of the system as well as the original design specification. It should be done by a person competent to do such work. business and usual then 
thank you. |
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18th Aug 2022 7:33am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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curious to see if anyone is as surprised as I was when I saw this install.
those familiar with unvented domestic hot water systems - anything in the photo that surprises you? note these are calorifiers and not direct / gas fired heaters. probably obvious considering the plate heater exchangers.  Click image to enlarge |
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18th Aug 2022 4:52pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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yep that was exactly my thought - they look rather large.
not only that with the plate heat exchanger is it even possible for the system to overheat? if not then I presume there are way too may PRV's? there are further PRV's behind the cylinders too 
I guess better too many than too few? until someone has to pay to replace them all 
the plate heat exchangers aren't there to separate the boilers from an old system - the whole install was new? |
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18th Aug 2022 5:47pm |
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| bear100 Member Since: 22 Mar 2010 Location: South Wales Posts: 1915  
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A typical plate to plate will only loose around 3/5c heat loss across them, the combined temperature and pressure relief size on the cylinder will be determined by the cylinder manufacturer, cylinders are also made to measure with specified tappings, maybe the installer didn’t realise and fitted a large PRV instead of bushing down? As long as they are sized right few the better really from a maintenance point of view and cost to repair or replace if they pass which they do.
Seems an awful big expense to fit PTP’s on a new traditional system? 2016 Range Rover Autobiography 4.4 TDV8 2010 110 XS Utility 2.4TDCI 2010 Range Rover Sport TDV8 (gone) 2007 Discovery HSE TDV6 (gone) 1993 110 csw 200 tdi (gone) 1994 90 HT 300 tdi (gone) 1994 discovery 300tdi (gone) 90 hybrid 3.5 v8 (gone) Range rover bobtail 3.5 v8 (gone) |
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18th Aug 2022 7:46pm |
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| Daisy90 Member Since: 01 Feb 2015 Location: Hampshire Posts: 845 
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Can it not be rotated enough in situ to get a weld completed ?
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18th Aug 2022 7:46pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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thank you for the thoughts but unfortunately that's not an option.
just to give you some background. we have some basement boilers serving ground floor retail with offices above. the retail requires heating both for extended periods during the week and weekend. if we can install a 3 port by-pass then we can effectively drop a couple of hundred radiators out of the circuit. |
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26th Aug 2022 4:07pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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anyone familiar with costs.
another property - we're looking to run a new flow and return up a building. will be 65mm increasing to 100mm but if we assume 100mm and circa 3.5 mtrs per floor (ie worst case). was initially looking at running copper mapress for speed etc but costs are mega so I'm now inclined to think heavy steel with Megapress couplers / fittings (35mm connections f&r per floor) might be the best option. costs appear to have gone through the roof recently. anyone familiar with current prices and could suggest a budget cost for installing heavy steel 100mm x2 (f&r) on a per floor basis (would include brakets and lagging) - just approx.
oh - and any interested in pricing the works - would be Midlands area. |
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5th Sep 2022 4:48pm |
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