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Chillers
TurboChill™ R1234ze Air Cooled and FreeCool
39
Chiller Technical Manual 7752785 V1.12.0_10_2018
Pressure Relief Valve Discharge Piping
Considerations must be made when designing pipework for PRV venting. This must be designed in accordance to
EN378-3 Section 5.8 Piping and ducting.
●
Caution must be taken to ensure excessive pressure drop in the pipework is avoided.
● All piping and ventilation ducting which passes through walls, ceilings and floors of machinery rooms, shall be sealed
where it passes through the walls or floors. The sealing shall have fire resisting properties at least equivalent to the
wall, ceiling or floor.
●
Discharge pipes from relief valves, safety valves and fusible plugs may diffuse the charge into the air by adequate
means but away from any air intake to the building or discharge into an adequate quantity of a suitable absorbing
material.
●
Relief devices for refrigerant in group A1 (R134a refrigerant) may discharge into the machinery room provided the
system charge is less that the limit set in Annex C of prEN378-1:2013. Such discharges of refrigerant should take
place so that persons and property are not endangered.
● Compression fittings must not be used for the discharge piping