Screw Vacuum Pump

Busch - NC 0100-0630 B

For many industrial applications including chemical and pharmaceutical processes

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Description

Description

COBRA NC are high efficiency dry screw vacuum pumps for many industrial applications including chemical and pharmaceutical processes. These models bring together many years of dry technology experience and offer key design benefits:

High suction capacity

between 0.01 hPa (mbar) and 100 hPa (mbar).

Reliable and robust

The asymmetrical screw profile and free gas outlet greatly improve the pumps ability to handle liquid and dust carry over. High corrosion resistance, is also incorporated, due to uniform temperature distribution. The optimised efficiency reduces the thermal load, thus increasing pump service life.

Easy to service

Simple, robust design and the ability to handle the vast majority of chemical gases ensures long service intervals and minimum maintenance downtime.

Application-oriented

Due to different standard versions. Water recirculation cooling or direct water cooling. COBRA NC screw vacuum pumps are available in different versions with ATEX certifications.

Principle of operation
COBRA NC vacuum pumps contain two screw rotors (3) which rotate inside a cylinder. Thereby, the gas is trapped between cylinder and screw chambers and carried to the gas discharge. There is no contact between the two screw rotors and there is no need for additional lubrication. Cooling is achieved by either a recirculating system without additional cooling water (4) or by a direct non-recirculating cooling system with external cooling water connection.
	1. Gas inlet 2. Gas discharge 3. Screw type rotor 4. Cooling liquid

Technical data
Suction capacity

			COBRA NC 0100 B	COBRA NC 0200 B	COBRA NC 0300 B	COBRA NC 0400 B	COBRA NC 0630 B
Nominal displacement	50 Hz	m3/h	110	220	320	350	525
Nominal displacement	60 Hz	m3/h	130	265	385	420	630
Ultimate pressure	50 Hz	hPa (mbar)	< 0,05	< 0,05	< 0,05	< 0,05	< 0,05
Ultimate pressure	60 Hz	hPa (mbar)	< 0,01	< 0,01	< 0,01	< 0,01	< 0,01
Nominal motor rating	50 Hz	kW	3,5	6,0	7,5	7,5	15
Nominal motor rating	60 Hz	kW	4,8	7,6	9,5	9,5	17
Nominal motor speed	50 Hz	min^-1	3000	3000	3000	3000	3000
Nominal motor speed	60 Hz	min^-1	3600	3600	3600	3600	3600
*Noise level, direct cooling**	50 Hz	dB(A)	70	71	72	66	70
*Noise level, direct cooling**	60 Hz	dB(A)	74	76	77	69	75
Weight approx.		kg	235	290	315	460	550
* DIN ISO 2151

Screw vacuum pumps
COBRA NC screw vacuum pumps have standardised ATEX safety packages for different zones. For you, this means absolute safety of the vacuum pump, the process and your plant. These vacuum pumps can also be modified retroactively for use in another zone. COBRA NC screw vacuum pumps are available in different versions with ATEX certifications. The temperature class depends on the relevant version.
ATEX certifications
	ATEX-1/2 Certification according the regulation 94/9/EG: Ex II 1(i)/2(o) G IIB3(i)/IIB(o) ATEX-2/2 Certification according the regulation 94/9/EG: Ex II 2(i)/2(o) G IIB(i)/IIB(o) ATEX-3/3 Certification according the regulation 94/9/EG: Ex II 3(i)/3(o) G IIB(i)/IIB(o)

Cooling Systems

1. COBRA NC 0300 B with radiator cooling	2. COBRA NC 0300 B with direct cooling system
COBRA NC screw vacuum pumps are available with two different cooling systems. 1. Radiator cooling with liquid coolant (standard) The closed loop circuit works with liquid cooled by an air cooled heat exchanger. No external cooling water inlet device required. 2. Direct cooling system (option) Once through cooling system with direct cooling by external cooling water. Various control systems on this basic cooling version guarantee a safe operation of the pump.

Screw vacuum pumps
Dimensions COBRA NC 0100 - 0300 B with radiator cooling

Dimensions	mm	A	B	C	D	E	F	G	N	Q	R	DN 1	DN 2
COBRA NC 0100 B	50 Hz	957	800	595	292	607	328	1110	250	125	315	DN 40*	ø 40**
COBRA NC 0100 B	60 Hz	957	800	595	292	607	333	1115	250	125	315	DN 40*	ø 40**
COBRA NC 0200 B	50 Hz	1207	1060	607	356	653	410	1243	262	324	297	DN 50*	ø 50**
COBRA NC 0200 B	60 Hz	1207	1060	607	356	653	410	1243	262	324	297	DN 50*	ø 50**
COBRA NC 0300 B	50 Hz	1279	1130	607	424	721	410	1311	262	328	297	DN 50*	ø 50**
COBRA NC 0300 B	60 Hz	1279	1130	607	424	721	410	1311	262	328	297	DN 50*	ø 50**
* PN 16, DIN 2576
Dimensions COBRA NC 0100 - 0300 B with direct cooling system

Dimensions	mm	A	B	C	D	E	F	G	H	I	DN 1	DN 2	DN 3
COBRA NC 0100 B	50 Hz	900	800	595	292	607	328	1157	250	222	DN 40*	ø 40**	PN 10/DN 15
COBRA NC 0100 B	60 Hz	900	800	595	292	607	333	1162	250	222	DN 40*	ø 40**	PN 10/DN 15
COBRA NC 0200 B	50 Hz	1160	1060	607	356	653	410	1300	262	235	DN 50*	ø 50**	PN 10/DN 15
COBRA NC 0200 B	60 Hz	1160	1060	607	356	653	410	1300	262	235	DN 50*	ø 50**	PN 10/DN 15
COBRA NC 0300 B	50 Hz	1230	1130	607	424	721	410	1366	262	235	DN 50*	ø 50**	PN 10/DN 15
COBRA NC 0300 B	60 Hz	1230	1130	607	424	721	410	1366	262	235	DN 50*	ø 50**	PN 10/DN 15
* PN 16, DIN 2576
Dimensions COBRA NC 0400 B
Radiator cooling

Direct cooling system

* with magnetic coupling
Dimensions COBRA NC 0630 B
Radiator cooling

Direct cooling system

Accessories
Flushing connection the inlet side for flushing the working chamber with inert gas after processing explosive or toxic gases. Sealing gas connection for the seals. Dilution gas to allow an optimal running of the pump in certain applications. Flame arrestors on the inlet side and on the pressure side for pumping down explosive media out of or into Zone 0. Flange adapters for inlet side DIN/ISO flanges in order to get an easy connection to existing piping systems. Non return flap with exhaust elbow to avoid any exhaust gas draw back. Exhaust silencer with elbow for noise reduction.