Yes. Non-split devices are standard, with Type S (Split) devices available at a premium.
Flush rates will vary from as little as 8-10 GPH (30-38 LPH) for smaller pumps and up, depending on the application and size of SpiralTrac. Generally:
On small-shaft equipment up to 5"/ 127mm, you can immediately reduce your flush rate to 8-10 GPH (30-38 LPH);
On large-shaft equipment over 5"/ 127mm, decrease the previous flush rate by 1/2;
If no problems are experienced, gradually reduce this flush rate until process begins to leak at the gland follower, or the pump housing becomes too hot to touch. At this point, increase the flush rate to the last known point where these problems weren't evident.
In both cases, the previously recommended flow controller and check valve should be installed.
The length of the device is the first consideration:
Version F (Type S) SpiralTrac is 1.850" / 46.99mm in length.
Version P SpiralTrac's length is dependent on the width of the lantern ring and the number of rings of packing it's replacing.
There are occasions when the axial length of the SpiralTrac is longer than the distance to the first obstruction. When this occurs, consult EnviroSeal.
MGE, Bearing Grade Peek (BGE) and Bronze devices can be tipically modified for Shaft Support.
The required flush pressure is dependent on the pump seal chamber pressure. Normal flush pressure should be above seal chamber pressure to create a flow. This enables the flush to push any contaminants under the existing throat. Since the important issue is the flow rate, we strongly recommend the use of a flow controller and the installation of a check valve. The check valve will dead head the seal chamber in the event of a flush failure, preventing contaminants from being drawn into the chamber and flush piping.
As this is still a "packed" application, the gland follower would be tightenened just beyond finger tight. For this reason, double-nuts or lock nuts are recommended.
We recommend a minimum of 3 rings of packing above the SpiralTrac.
We recommend using a grade of packing that can tolerate slightly higher temperatures. Why? Since the leakage on the packing is at a controlled "drops-per-minute" rate (due to the greatly reduced flush rate), the packing will sometimes run a little hotter.
These devices are designed to be easily installed in the field where the required upgrades associated with the air vent cannot be done.
Typically, any wear is usually under the first two rings of packing, which is in the area that is covered by the SpiralTrac, and unless the wear is excessive, the device will function properly.
It is very important that the shaft/sleeve area under the packing behind the SpiralTrac is in perfect condition.
The SpiralTrac Version P has four pre-drilled, threaded holes on the gland side of the device to facilitate the starting of a packing extractor.
No. At this time, all packing versions of SpiralTrac require a flush to force any contaminants under the existing throat. We do not recommend or support running these devices flush-free.
There are a number of methods to ensure the SpiralTrac Version P is installed correctly:
There is an installation label indicating the impeller side of the device (which should be removed prior to installation!);
Rotation direction is engraved on the lantern ring section;
The part number is engraved on the impeller end of the SpiralTrac;
The tangential hole will inject the flush in the direction of shaft rotation; and,
The four pre-drilled and threaded holes that facilitate the removal of the device should be facing the gland.
Case (A): In some cases, yes. If a 3/4" / 19.05mm cross-section is available, EnviroSeal can design a packing device where the cross-section is reduced and the minimum three rings of packing above can be used, providing a much better sealing solution. Consult EnviroSeal to discuss your particular application;
Case (B): A minimum of 1-1/4" / 31.75mm is required to incorporate the SpiralTrac technology into a device. For example, if the lantern ring is 1" / 25.4mm and there are 5 rings of packing on the gland follower side, SpiralTrac would replace the lantern ring and one ring of packing. This total length will give us the minimum space required, so a lantern ring in this position does not pose a problem; and,
Case (C): Consult with EnviroSeal. We've been able to manufacture customized SpiralTracs to replace many different bushing and lantern ring combinations (e.g. common in Warman and Allis-Chalmers SRL pumps). We may have already designed a SpiralTrac for your arrangement!
No; however, if you are changing the packing, and time is available, you can remove, inspect, clean and reinsert the SpiralTrac before replacing the packing.
No. For ease of installation, the SpiralTrac Version P is designed to be inserted from the gland side of the stuffing box with a locational clearance fit. The rings of packing above and the gland follower will keep the device in place.
Equipment: Ash 500 Model G9-H11
Application: Paper Stock
Equipment: Alshtrom ZYX-70 Head Box Feed Pump
Aside from the original, EnviroSeal offers it's highly popular Version P device in three modified configurations. Check them out below.