Contactor Reactor Maintenance Schedule

The following table contains most of the maintenance information regarding the STRATCO Contactor™ reactor

which is need to be done at regular basis.

Component	Location	Inspection Frequency	Estimated Life	Remarks
Internal Grid	Lower circulation tube, above impeller	3 months	5 – 20 yrs	(Access through top manway.) Ensure nuts on J-bolt clips are tight/secure. Inspect welds securing mounting clips to circulation tube jacket.
Manway flat gasket	Top head	Each use	Varies	Leakage normally evident through steam discharge during operation. Ensure gasket intact.
TubeTurn Manway ring gasket	Top head	Each use	Varies	Leakage normally evident through steam discharge during operation. Ensure gasket intact.
Anti-vortex Plates	Lower circulation tube, above impeller	Annually	20 – 40 yrs	(Access through top manway and from below with hydraulic head removed.) Inspect welds, plate-to-plate and plate-to-circulation tube. Check thickness and surface condition.
Lower Vanes	Lower circulation tube, between circulation tube and shell	Annually	20 – 40 yrs	(Access from below with hydraulic head removed.) Inspect welds, plate-to-shell and plate-to-circulation tube. Check thickness and surface condition.
Impeller cap	Hyd. Head assembly, above impeller	Annually	5 – 20 yrs	(Access inside hydraulic head with hydraulic head removed.) Check surface smoothness; grind to smooth out channels as required.
Impeller	Hyd. Head assembly	Annually	2 – 10 yrs	(Access inside hydraulic head with hydraulic head removed.) Check surface smoothness. Minor channeling may be ground smooth for extended life only if dynamically and statically rebalanced.
Impeller Shaft	Hyd. Head assembly	Annually	20 – 40 yrs	(Access with hydraulic head removed.) Check runout above sleeve bearing with impeller removed and motor coupled. Check clearance in bearing. Remove shaft to inspect surface at sleeve bearing, mechanical seal and rigid coupling and locknut threads.
Sleeve bearing	Head casting, below impeller	Annually	2 – 10 yrs	(Access with hydraulic head disassembled.) Check clearance with impeller shaft. Check surface smoothness.
Head casting	Hyd. Head assembly	Annually	20 – 40 yrs	(Access with hydraulic head removed.) Check surface smoothness; pitting should be ground smooth for extended life. Check vane thickness; vanes should be overwelded and ground smooth if thinning is excessive. Check “nib” at bottom of gasket groove; nib can be overwelded and remachined for extended life.
Mecahnical Seal (John Crane Type 9)	Hyd. Head assembly, inside seal chamber	As required	1 – 2 yrs	(Access with motor uncoupled and seal chamber cover removed.) Inspection and replacement required when leakage is detected. Replacement recommended whenever seal is removed.
Mechanical Seal (Cartridge type)	Hyd. Head assembly, below seal chamber	As required	3 – 6 yrs	(Access with motor uncoupled and motor slightly lowered.) Inspection and replacement required when leakage is detected. Seal can be reused if removed with setting tabs in place.
Rigid Coupling	Hyd. Head assembly, between impeller and motor shaft	Annually	20 – 40 yrs	Check runout of impeller shaft above coupling. After removal of coupling, check condition of bore.
Slinger ring o-ring	Hyd. Head assembly, on motor shaft below coupling	Annually	2 – 10 yrs	(Access with motor uncoupled.) Check condition of o-ring and indication of leakage past o-ring on motor shaft.
Motor	Hyd. Head assembly	Annually	20 – 40 yrs	Check shaft runout; motor bearing require periodic replacement. Check drain opening at upper flange. Inspect interior for presence of excessive amounts of grease.
Lubricator	Near Hyd. Head assembly	Daily	20 – 40 yrs	Check reservoir level. Ensure proper flow of lubricant to seal chamber. Ensure seal chamber is filled prior to energizing impeller motor. Verify check valve integrity.
Head gasket	At the flange where the hydraulic head attaches to the shell	When disassembled	1 to 3 uses	This would require replacement any time the two components are separated for the purpose of service or inspection.
Manway gaskets	On the manway located on the top head of the shell	At each use	1 month (flat gasket) 1 year (o-ring gasket)	Life span varies depending on the type of gasket, but is typically replaced any time there is evidence of leak of vapor during operation.