Chris Parsloe regularly undertakes troubleshooting and expert witness work. His specialist expert knowledge, combined with excellent report writing and presentation skills are a formidible combination in technical dispute situations.

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Sample cases (more in CV):

• 2005:  An investigation into the cause of water hammer (hydraulic shock) in an apartment block.  I was able to demonstrate that water hammer was caused by malfunctioning pressure reducing valves in the hot and cold water supplies.

• 2004:  An investigation into the cause of failing two port control valves in heating and chilled water systems.  I was able to prove that the cause was due to the valves having to close against excessive pump pressures resulting in cavitation erosion across the valve seats.

• 2004 - 2006:  An investigation into the origin of dirt and bacteria in chilled and heating pipework systems some 18 months after handover.  I was able to argue that the system was clean (in accordance with BSRIA Guidance) when it was handed over to the client, and that most of the problems were due to poor maintenance after handover.

• 2006 - 2007: An investigation into the causes of dirt in water samples taken from heating and chilled water fan coil units.  Dirt in the system had been caused by Pseudomonas bacteria. Analysis showed that most failures occurred where high resistance 2 port control valves had been installed. These valves had been selected due to the arbitrary positioning of large DPCVs on main branches off a riser.  I was able to demonstrate that this system configuration made it impossible to size 2 port valves with adequate authority, and that in attempting to do so, the contractor had ended up with very high resistance valves and consequent blockage problems. 

• 2007- ongoing: An investigation into the causes of severe erosion of two port control valves and early failure of steel radiators.  I was able to determine that cavitation was possible in the system due to the pressure conditions and water quality.

Cavitation erosion of 2 port valve seat

Corrosion failure of steel radiator

Water hammer generated in pressure reducing valves.

Blocking of small 2 port control valves.