Nazareth Chapel
Llwynhendy Carmarthenshire

Nazareth is a Welsh Calvanistic Methodist Chapel built in 1865. Modifications were made in 1925.

The original warm air heating of the Chapel was supplied by a Musgrave warm air stove which is still extant.

The Perkins HPHW pressurised heating system installed by Musgrave & Co of Cardiff was most likely installed during the later part of the Victorian period.

4-pipe sinuous coil

6-pipe sinuous coil

During the 20th Century the Perkins system was modified by the inclusion of steel panel radiators and the installation of an oil fired boiler plant with pumped circulation. The system was also downgraded from pressurised to a LPHW by the installation of a feed and expansion tank.

It is obvious that the Heating Contractor who carried out these modifications to the Perkins system had no idea what the design criteria was for a Perkins continuous single loop 3 circuit pressurised sytem.

The modifications that were made, completely compromised the performance of the system, such that it would never prove effective in heating the Chapel.

The fitting of steel panel radiators in the Vestry would not have been beneficial in improving the heating output in that area.

These radiators are fitted with 20mm TBOE connections welded into the top pipe of sinuous coils.

There would only be a minimal water circulation through the radiator due the very high resistance
through the small bore hydraulic Perkins tubing.

The removal of the Perkins coal fired furnace and its replacement with an oil fired boiler and circulating pump fitted in the main return pipe condemned the heating system as unfit for use. 

The 3 circuit continuous single loop Perkins pipework in the Boiler room was cut and reconnected as three separate flow mains each with a gate valve to provide a very coarse means of balancing each circuit.

The three return pipes were then connected together to form a common return to the boiler, with a small duty (domestic size) pump fitted into this common return pipe. This pump had no possibility of circulating water through small bore hydraulic tubing.

If a larger duty pump had been fitted in each of the three flow pipes then this might have improved the circulation but never sufficient to effectively heat the Chapel.

It is notably obvious that a total lack of understanding by the Heating Contractor for the design of the installed pipework system, made any modifications useless in improving the heating output of the system.

The only way forward now to heat the Chapel to comply with current heating standards, is sadly for the removal of the Perkins pipework and its replacement with a conventional LPHW (open or sealed) pumped system with radiators.

Partial removal of the Perkins pipework 

September  2014