SPX Cooling Technologies TG MAG23-65 3.8Maximum and minimum allowable temperature, Internals

3.7.3Influences

The real sound level of the pump unit can for several reasons deviate from the values listed in the tables above.

•Noise production decreases when pumping high viscosity liquids due to better lubricating and damping properties. Moreover the resistance torque of the idler is increasing due to higher liquid friction which results in lower vibration amplitude.

•Noise production increases when pumping low viscosity liquids combined with low working pressure because the idler can move freely (lower charge, lower liquid friction) and the liquid does not dampen much.

•Vibrations in piping, vibrating of the baseplate etc. will make the installation produce more noise.

3.8Maximum and minimum allowable temperature

The maximum allowable temperature of the pumped medium is 260°C but the temperature limits must be considered depending on the material used for the idler bearing bush, O-ring material and material of the permanent magnets used in the magnetic coupling. The minimum allowable tempera- ture is -20° for cast iron and -40°C for stainless steel casing parts.

3.9Jacket options

S-jacketsare designed for use with saturated steam or with non-dangerous media. They are provided with cylindrical threaded connections according to ISO 228-I.

Maximum temperature:	200°C
Maximum pressure:	10 bar

T-jacketsare designed for use with thermal oil and apply to the DIN4754 safety standard for thermal oil transfer. This DIN standard specifies flange connections for temperature from 50°C upwards and jackets of ductile material for temperature from 200°C upwards. Both are provided in the T-design.

T-jackets could also be used for over heated steam or more dangerous media.

The flanges have a special shape with welding neck based on PN16 dimensions.

Maximum temperature: 260°C

Maximum pressure at 260°C: 12 bar

3.10 Internals

3.10.1 Bush materials

Overview of bush materials and application field

Material Code		S	C	B	H	U	Q
Material		Steel	Carbon	Bronze	Ceramic	Hard metal	Silicon Carbide
Hydrodynamical	if yes	to maximum working pressure = 16 bar
lubrication	if no	6 bar (*)	10 bar (*)	6 bar (*)	6 bar (*)	10 bar (*)	10 bar (*)
Corrosive resistance		Fair	Good	Fair	Excellent	Good	Good
Abrasive resistance		Slight	None	None	Good	Good	Good
Dry running allowed		No	Yes	Moderate	No	No	No
Sensitive to thermal shock		No	No	No	Yes dT<90°C	No	No
Sensitive to blistering in oil		No	> 180°C	No	No	No	No
Oil aging		No	No	> 150°C	No	No	No
Food processing allowed		Yes	No (antimony)	No (lead)	Yes	Yes	Yes

(*)These are not absolute figures. Higher or lower values possible in function of the application, expected life- time etc.

18 A.0500.551 – IM-TGMAG/02.00 EN (02/2008)