Similar to the version N, but with an integral bottom drain that allows process to drain from the seal cavity on pump shutdown, minimizing process crystallization problems on pump restart and increasing maintenance safety.
No, the seal versions of SpiralTrac are not designed to work with packing. The only SpiralTrac that is specifically designed for packing is the Version P.
The spiral groove always faces the seal and should spiral in the direction of the shaft as viewed from the seal end looking toward the impeller. This will be either clockwise (right-hand rotation) or counterclockwise (left-hand rotation) as viewed from the drive end (typically, ANSI/ISO is clockwise, API is counterclockwise);
The part number is engraved on the impeller end of the SpiralTrac;
There is an installation label indicating the direction of rotation (which should be removed prior to installation!); and,
For SpiralTrac Versions D and N (with an integral air vent), the air vent must be in the 12 o'clock position.
Double-ended pumps: There should be one left-hand rotation device and one right-hand rotation device (either packing or mechanical seal versions). Direction of rotation is determined from the motor end looking towards the impeller.
It depends on the application. If solids are removed, there are certain applications where the less expensive and cooler running soft faces can be used where only hard faces were used previously. Consult with EnviroSeal to determine your application's suitability.
The typical clearance between the SpiralTrac and the OD of the shaft is .018" / 0.46mm radial, but this can vary depending on the size of the device and the material it is made from.
The Version C is available in Type I only. The drain must have a clear path to the impeller cavity in order to allow trapped product to completely drain from the seal cavity.
Yes. SpiralTrac is designed to work with nearly any type or make of mechanical seal.
Absolutely! The problems associated with air and solids in the cavity are the same with double seals as they are with single seals. Double seals are expensive, and using SpiralTrac is an excellent, low-cost way of protecting your investment!
Application: Black Liquor
Equipment: ABS Scanpump