Parts per million (ppm) is used to denote relative proportions in measured quantities; particularly in low-value (high-ratio) proportions.
The pump performance curve shows the correlation between media flow (Q) and the pressure differential or head (H) that the pump creates.
pH is the measure of the acidity or alkalinity of a solution and ranges from 0-14.
Pilot valves are often used in larger refrigeration plants with many consumers. A pilot valve is an add-on to the in-line valve. It only takes a small force to operate the larger valve like in a hydraulic piston.
Pipes that distribute a heating medium lose some heat to their surroundings. This heat loss causes undesired cooling of the medium in the pipes.
Pipes carrying hot media are insulated to minimise unintentional heat loss. Heat loss will cool the media while heating the room in which the pipe is located. Both are undesirable.
Pitting corrosion is a localised form of corrosive attacks. Pitting corrosion forms holes or pits on the surface of metal.
A plate heat exchanger is a heat exchanger that is used to transfer heat from one fluid to another.
The power curve shows the power consumption of the pump at a given flow.
The power factor is the phase angle between voltage and current (cosĪ)
