Do all positive displacement pump outlets need to be equipped with safety valves?
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Do all positive displacement pump outlets need to be equipped with safety valves? Such as common types of gear pumps, screw pumps, vane pumps, etc.
Yes, safety valves must be installed at the outlet of all positive displacement pumps! The safety valve is an important accessory of positive displacement pumps; it is usually installed after the outlet collection pipe of the pump. In cases where there is a discharge buffer tank, it must be installed in front of the first valve (shut-off valve) after the discharge buffer tank.
Strictly speaking, a safety valve must be installed at the outlet of every positive displacement pump. However, some pumps come equipped with safety valves or pressure relief devices already at the time of manufacture, so it may be possible to omit the safety valve; this depends on the specific pump.
Positive displacement pumps are primarily at risk of damage to the equipment and pipelines due to pressure buildup in the lines caused by blockages at the outlet; safety valves can be installed to relieve pressure, or self-acting control valves can be used to regulate pipeline pressure, or a tank pressure interlock device can be employed to ensure the safe operation of the pump equipment.
There is a type of diaphragm reciprocating pump that comes equipped with its own safety overflow device; therefore, it should not be necessary to install a pipeline safety valve
According to chemical engineering design specifications, electric positive displacement pumps must be equipped with safety valves, while positive displacement pumps driven by steam do not require safety valves. Relevant details can be found in the \"Process Piping Installation Design Manual\".
Not all positive displacement pumps are equipped with safety valves; the presence of such valves depends on the medium.
We have installed a safety valve after the check valve in the outlet pipeline of the positive displacement pump of our unit