Electric switches and control devices, instrumentation and accessories must correspond with the valid
safety requirements and regulations for explosion protection.
2.2 Use acc. to Regulations
Speed, Pressure, Temperature
Suitable safety measures must be taken at the plant to ensure that the speed, pressure and tempera-
ture of the pump and the shaft sealing do not exceed the limit values given in the data sheet and / or
order confirmation. The given admission pressures (system pressures) must also be sufficiently high.
Further, pressure shocks, as can occur on too fast shut down of the facility, must be kept away from the
pump (e.g. by non-return valve at pressure side, airtanks). Quick temperature changes must be avoided.
They could cause a temperature shock and lead to damage or impair the function of single components.
Permitted Nozzle Loads and Torques
Basically the suction and discharge piping must be designed in such way, that as little forces as pos-
sible are effective to the pump. If that is not possible, the values shown in chapter 3.5 must not be ex-
ceeded under any circumstances. This is valid for the operation as well as for the standstill of the pump
and therefore for all possible pressures and temperatures of the unit.
NPSH
The pumped liquid must have a min. pressure NPSH at the impeller inlet, so that cavitation free work
is secured resp. a "break off" of the pump flow is prevented. This condition is fulfilled, when NPSH-value
of the system (NPSHA) lies above NPSH-value of the pump (NPSHR) under all operating conditions.
Attention must especially be paid to the NPSH- value on pumping liquids near the vapour pressure. If the
NPSH-value of the pump remains under, this can lead from damage of the material due to cavitation to
destruction by overheating.
The NPSH-value of the pump (NPSHR) is shown in the curves of every pump type.
Sealing, Flushing, Cooling
Suitable provisions for the regulation and monitoring of sealing, flushing or cooling are to be provided.
When handling dangerous liquids or if temperatures are high, care should be taken to ensure that the
pump ceases operating if the sealing, flushing or cooling system fails.
Sealing, flushing and cooling systems must always be operational before the pump is started up. They
should not be taken out of operation until the pump has stopped, provided that the nature of the opera-
tion allows this at all.
Back Flow
In systems where pumps are operating in closed circuits under pressure (gas cushions, steam pressure),
the pressure of the gas cushion must not be reduced via the pump, since the back flow speed may be
much higher than the operating speed, which would destroy the unit.
2.3 Unauthorized Alteration and Spare Parts Production
Alteration or changes of the machine are permitted after agreement with the manufacturer.
Original spare parts and accessory authorized by the manufacturer are serving the safety.
The use of other parts can lead to loss of liability for therefrom resulting consequences.
2.2 Use acc. to Regulations
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ICB Installation, Operation and Maintenance Instruction
Содержание Goulds Pumps ICB
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