Grasso Screw compressors Types C ... XF Product Information - GEA ...

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PRODUCT INFORMATION GRASSO SCREW COMPRESSORS Types C ... XF OPERATING LIMITS Compressor frame size P R/ S/ T V/ W /Y Z/ XA XB/ XC/ XD XE/ XF Max. driving power (kW) 50 Hz 60 Hz 530 640 530 640 1250 1500 1250 1500 1800 2160 3000 3600 Max nominal torque **) Nm 1700 1700 4000 4000 5750 9500 Max. allowable speeds (rpm) min -1 3600 3600 3600 3600 3600 3600 minimum speed limits min -1 1500 1500 1500 1500 1500 1500 *) In the size E/G and M/N the compressors have different drive shaft ends. **) When running the compressor the maximum torque falls by 25% as opposed to electrical drives. The nominal maximum driving power is the upper limit determined by the shaft end. For reasons of bearing loads mentioned maximum driving power will not be achieved by all delivery flow sizes available within a compressor type. The examination is done in the compressor selection program. For more information see chapter regarding compressor model designation. 20 _101011_pi_sc_gbr_2_.doc GEA Refrigeration Germany GmbH 23.03.2012
PRODUCT INFORMATION GRASSO SCREW COMPRESSORS Types C ... XF OPERATING LIMITS Hint! All of the following requirements must be observed! Compressors for a discharge pressure up to 52 bar are equipped with housings made of a material of higher strength and are fitted with special components. Minimal overheating at suction side: "Wet" operation to be avoided. For Δ p = p - p o ≤ 4 bar an external oil pump to be taken for frame sizes C to N. For Δ p = p - p o ≤ 4 bar for compressors in the LT with Vi settings range a functional oil pressure of p oil ≥ p 0 + 4,5 bar needs to be maintained. For π ≥ 8 gas vibration protection is required. For CO 2 usage the use of a completely electrified oil pump for injection and function oil needs to be checked in all types of compressors depending on the operating conditions; in types Z to XF a partially electrified oil pump or completely electrified oil pump can be examined for the function oil depending on the operating conditions. The discharge temperature t e must be 10 K above the condensing temperature (t e ≥ t c + 10 K). Due to the solubility of refrigerant in the oil following applies: • for Ammonia: – t e ≥ t oil + 5 K; – t e ≥ t oil + 10 K, when using a PAG oil (dissolving of refrigerant in the oil). • For R22, R134a, R404A, R407C, R410A, R507, CO 2 , natural gas, carbohydrate molecules: – t e ≥ t oil + 10 K, when refrigerant is dissolved in the oil. → To determine the permitted difference between the discharge temperature (t e ) and oil intake temperature (t oil ) the set viscosity and the solubility diagram for the refrigerant-oil pair from the lubrication supplier need to be adhered to. If oil viscosity is ≥7...the 70 cSt needs to provided for the oil solubility. Take into account the drop in viscosity due to refrigerant dissolved in the oil! Limits for temperature differences will be considered in compressor selection programs. The oil temperature at the compressor inlet must be at least 18°C, the oil must be preheated if necessary. The rate of temperature change at compressor suction side should not exceed 0.1 K/s. Direction of rotation: view of compressor’s driving shaft: clockwise. For individual cases outside the permitted speed coordination needs to made with the manufacturer. p p 0 Maximum permitted pressure Suction pressure Δp Pressure difference (p - p 0 ) π Pressure ratio (p / p 0 ) t 0h t e t c t oil Suction temperature (compressor inlet) Discharge temperature (compressor outlet) Condensing temperature oil inlet temperature into the compressor GEA Refrigeration Germany GmbH _101011_pi_sc_gbr_2_.doc 21 23.03.2012
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