251 Series - Air & Gas

Technical Data

Number of stage: 1 thru 7 (8 for 50Hz)
Inlet connection: 14" (356 mm) flange, ANSI 125# drilling
Outlet connection: 14" (356 mm) flange, ANSI 125# drilling
Operating speed: 3550 rpm in direct drive (60Hz)
Lubrication: Oil type with constant level
Impeller diameter: 26" (662 mm)
Impeller tip speed: 400 fps (122 m / sec)
Drive: Direct drive or gear box or V-belts
Vibration tolerance: 1.25 mils peak-to-peak (4.5 mm /s)
Balance piston: From 5 to 8 stages with pipe connection
Shaft end: 2" 9/16 (65mm) diameter,
inlet end drive standard

Materials of Construction

Heads, bearing housings: Cast iron ASTM A-48 Class 35B
Tie rods: 13/16" (20 mm) diameter
cold drawn steel A60
Joint sealing compound: RTV IS502 Silicone
Seals (air): Graphite ring (standard) or
carbon ring each end
Seals (gas): Four carbon rings each end
with inert gas injection
Bearing: Ball bearings 6313 C3 per AFBMA B10 STANDARD
Shaft: AISI 1038 Carbon Steel or equivalent
Impellers: Fabricated aluminium ASTM 6061
Baffle rings: Stainless steel
Motor pedestal : Structural steel
Base pads : Korfund Elasto-rib or equivalent
Noise level: In compliance with OSHA standards
when machine is fully piped
(certified tests available)