Used in fibrous (paper stock) applications with a small flush, 5-8 gph (0.3-0.5 lpm), if the product is aerated and single seals are used, or with no flush.
Pulp n Paper: pulp
The Version D is available in Type I (metals only), Type A, and Type E only.
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 Version D and Version N are both used in mechanical seal applications and are installed similarly: however, they differ in the length of the devices and the applications that they are used in.
The Version N SpiralTrac is designed to be used in applications where non-fibrous particles such as silt, sand, etc. are typical. Particles of this type separate based on density: thus, heavier particles centrifuge to the bore where the SpiralTrac collects them and moves them out of the seal cavity into the process and away from the seal.
The Version D has a double spiral and is therefore longer than the Version N. It was designed for applications where the product is fibrous, such as pulp, corn mash and municipal wastewater applications. The double spiral provides greater capacity to move material out of the seal cavity. A Version D used in an application with non-fibrous particles could prematurely erode the pump and seal as a result of this increased movement of abrasive material. If you are unsure whether you should use a Version N or Version D, please contact EnviroSeal for assistance.
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.
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: C2 High Pressure Digester Pump