SCREWLINE SP 250 3Ph 200/400 V 50 Hz, 210/460 V 60 Hz; purge gas unit, manual gas ballast

Leybold SCREWLINE SP 250 – outdated model

The SCREWLINE SP 250 is no longer part of the current Leybold range: in the SCREWLINE series Leybold now lists the SP 630 and the SP 630 F; Leybold names no direct successor to the SP 250 in its current documents. In the Ehrler & Beck range, the water-cooled DRYVAC DV 300 comes closest to the SP 250 in pumping speed and ultimate pressure. The SCREWLINE SP 250 reaches an effective pumping speed of 270 m³/h at 50 Hz and 330 m³/h at 60 Hz and an ultimate pressure of ≤ 0.01 mbar (60 Hz: ≤ 0.005 mbar). The nominal power is 7.3 kW at 50 Hz and 9.2 kW at 60 Hz; at ultimate pressure the pump draws 5.9 and 7.2 kW respectively. It is air-cooled, measures 1350 × 530 × 880 mm (W × D × H) and weighs approx. 450 kg. The noise level is ≤ 68 dB(A) at 50 Hz and ≤ 72 dB(A) at 60 Hz, measured with connected exhaust line at ultimate pressure.

Design

Two counter-rotating screw rotors that run without contact convey the gas on a direct path from the inlet to the outlet; according to Leybold this makes the pump insensitive to foreign materials. The rotors have a cantilevered bearing arrangement: there is no bearing on the intake side, so no lubricant from the bearings can enter the process and no aggressive process medium can attack the bearings. The pump housing can be removed without dismantling the bearings – the surfaces in contact with the medium can be cleaned on site. According to Leybold, a temperature of at most 100 °C is reached inside the pump, which avoids deposits of temperature-sensitive substances. The two non-contacting shaft seals are practically wear-free; all pumps have a purge gas unit and the SP-GUARD monitoring system.

Versions and order numbers

• 115001: standard with purge gas unit and manual gas ballast
• 115006: as 115001, additionally with castors
• 115003: ATEX version (category 3 inside only) with purge gas unit and electromagnetic gas ballast; marking II 3/-G Ex h IIC 160 °C Gc and II 3/-D Ex h IIIB T160 °C Dc, ambient temperature 10 to 40 °C
• 115012V11: ATEX version with purge gas unit, electromagnetic gas ballast, purge vent kit and FFPM gaskets; marking II 2/3G Ex h IIC 160 °C Gb / Ex h nA IIC 160 °C Gc and II 3/3D Ex h IIIB T160 °C Dc / Ex h tc IIIB T160 °C Dc, ambient temperature 10 to 40 °C
• 115019: O2 version with purge gas unit and electromagnetic gas ballast

All versions are designed for 50 and 60 Hz (200 V / 400 V at 50 Hz, 210 V / 460 V at 60 Hz).

Applications

Leybold names, among others, food processing, vacuum coating, lamination, loadlock chambers, metallurgy and furnaces, crystal pulling, degassing, vacuum drying, freeze drying, packaging, chemistry and pharmaceuticals, space simulation and use as a backing pump for high vacuum systems. The data are taken from the Leybold Full Line Catalog (Edition 2022), part “Dry Compressing Vacuum Pumps”.

Pumping speed 50Hz	270
Pumping speed 60Hz	330
Ultimate pressure	0.01
Rated motor power 50Hz	7.3
Rated motor power 60Hz	9.2
Motor efficiency class	IE2
Weight	450
Length	135
Width	53
Height	88
Inlet connection flange	DN 65 PN 6 / ASME 3" (DN 63 ISO-K with adapter flange)
Outlet connection flange	DN 63 ISO-K
Noise level	68 dB(A)
Cooling method	Air cooling
Oil type	LEYBONOL LVO 210

Additional technical data