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St Patrick’s College Chimney Installation
Ballymena &
Job:
St Patrick’s College, Ballymena
Industry:
Education
Client:
LM Services
Application:
Condensing Boiler
Project Brief
John J Doyle Ltd is contracted to complete conditioning reports for the chimney and flue systems for a number of the schools across Northern Ireland. As a result, the company completes a number of school and college chimney installations and remedial works each year. John J Doyle Ltd carried out a survey and issued a conditioning report on the internal flues and windshield structure at St Patrick’s College, Ballymena.
The survey found that the initial chimney system had been installed for old oil non-condensing boilers therefore making the overall system non-compliant with the existing gas fired condensing boilers.
Whilst onsite, we discovered that the flues installed internally were leaking in multiple places. Also, the windshield structure, installed 20+ years ago, was no longer fit for purpose.
The windshield structure has old mild steel internal liners which were deteriorating from the condensation build up. Built up condensation can create a huge risk.
John J Doyle Ltd was contracted to complete an installation of the internal chimneys and windshield structure at St Patrick’s College, Ballymena to bring it up to standards and comply with all necessary regulations.
Materials Used
Dinak DWJ twin wall 350ΓΈ
3x Internal core fully welded liners 316L stainless steel with 50mm rockwool insulation
Outer shell carbon steel shot blast to SA2.5 and painted 3 coats os 2 pack epoxy 200 microns – overall diameter 1.4m
Result
With a few onsite meetings and discussions with the design team it was discovered that the existing windshield structure was far taller than required. After carrying out all necessary calculations including BS EN13084-7 and 1090 ex class 2 and whilst adhering to all relevant standards including UP10 and Clean Air Act, John J Doyle Ltd were able to decrease the height of the new windshield by almost half.
As the existing boilers have been in place for many years, we opted to increase the flue diameters in order to future proof the installation should any of the existing boilers require replacement.
The existing structure was safety dismantled and removed from site within a day when the pupils were absent in order to help with health and safety.
New holding down bolts were chemically anchored and allowed to cure for 24-48hrs prior to the new structure arriving.
The new structure was safely landed and installed all within a few hours, again on a day when the pupils were absent for with health and safety in consideration.
All internal Dinak DWJ 316L stainless steel flues were installed with test points and at least a 3Degree fall to allow for any condensation to be correctly drained away.
New box flashing was installed where the new structure protrudes through the boiler house.
The overall installation, from dismantling to commissioning was carried out within 7 days.
All chimney and flue products were supplied and installed CE Marked and compliant with European and regional standards.