Are you knowledgeable about mechanical pump packing and how it functions? While I grasp the basic concepts, I still lack a comprehensive understanding of pump packing and am encountering issues with it – from improper installation to selecting the right packing. Currently, SEPCO ML8002 is being utilized, but we are contemplating switching to high carbon content packing for reduced cooling needs and improved durability during removal. I operate in challenging environments with high solids applications, such as alumina hydrate. Can anyone suggest a suitable packing type or refer me to a knowledgeable individual or a resource for further guidance? Additionally, what should the clearance be between the stuffing box and packing? For my specific pump [GIW 12x14 LCC-28], a 3/4" packing was advised, but the clearance between the shaft sleeve and the stuffing box's ID is 13/16" [0.813], resulting in a 1/16" gap. Should the packing fit tightly inside the stuffing box during installation? After installing the packing and starting the pump, product leakage from the stuffing box indicates low purge pressure. Despite not making final adjustments on the packing, a loose fit should not lead to product leakage if purge pressure is adequate. Are there other contributing factors? Any insights would be greatly appreciated.
How long has this pump been in operation? Is the pump currently operating at its optimum efficiency point? Are all alignments correct? Could this be considered a slurry equivalent application? Consider the possibility of using a dynamic seal that requires no flushing for optimal performance.
Dear Customer, The clearance between the shaft sleeve and the ID of the stuffing box is 13/16" [0.813], resulting in a clearance of 1/16". Should the packing have an interference fit inside the stuffing box during installation? It is important to double-check the manual for accuracy. If there is a discrepancy, you may need a 7/8" packing based on your measurements. Refer to the Pump Manual for detailed packing preparation instructions. If the manual is not available, follow the steps outlined below: 1. Create a steel packing mold with a male pusher matching the shaft sleeve diameter and a pusher flange. The female bore should match the stuffing box bore, with flanges at both ends and a hole at the bottom for the male pusher to slide in smoothly. 2. Prepare a hardwood dummy mandrel that matches the shaft sleeve diameter and is approximately 12 inches long. 3. Cut a packing ring at a 45-degree angle on the mandrel to achieve the exact circumferential length. 4. Fully compress the ring on the mandrel, measuring the compression amount – designated as dimension P. 5. Set a limit stop to prevent over-compression beyond P/2. 6. Cut multiple rings as needed for the packing, compressing each to half of dimension P in the mold. Apply graphite paste for lubrication. 7. Clean and lubricate the stuffing box gland components, including the pusher threads and OD surface. 8. Trim a spanner to a maximum length of 6 inches for leverage on the pusher nuts. 9. Create half-sleeves for the packing space with ample clearance. Install them with removable screws for easy removal. 10. Ensure the shaft sleeve is in optimal condition and lubricate its surface and the stuffing box bore. 11. Insert and position each ring sequentially with the cut at different clock positions for proper alignment and sealing. 12. Use a gland pusher to snugly fit the rings into place. 13. Tighten the gland pusher evenly with a cut spanner while rotating the pump shaft slightly. 14. Start the pump and monitor for slight leaks, gradually tightening the pusher further until the leak diminishes. Following these detailed steps will ensure a secure and long-lasting packing installation for your pump.
Vee, I'm concerned that a 7/8" packing may be too large for our application. Additionally, using a 3L1 arrangement with the 7/8" packing would significantly decrease the available space in the stuffing box by half an inch. This could be problematic as our stuffing box depth is currently 4-3/8". I am in the process of double-checking with GIW to confirm the proper size sleeve and to verify the dimensions of the stuffing box.
After pre-compressing in a mold, the packing will match the bore and sleeve sizes perfectly, creating a tight fit. Opt for 13/16" packing if available, but 7/8" will suffice. Unsigned posts may not receive a response.
Thank you for your help. I have updated my profile details.
Your challenges in mechanical pump packing certainly calls for attention. Moving to high carbon content packing might be a beneficial decision considering its durability and cooling benefits. A pump with cohesive, non-abrasive, and well-lubricated solids like alumina hydrate can use a variety of packing types. You might want to check out graphite-based or PTFE-based packings as they might offer better durability and heat resistance. As for the packing size, it should ideally be snug in the stuffing box but not overly tight that it hinders the pump shaft's rotation. A 1/16" gap is generally acceptable, but any more and you may struggle with leakage, which seems to be your issue. While adequate purge pressure is important, improper packing size and type, as well as installation errors, can still allow for product leakage. The selection of the packing style, size, and the method of its installation should meet the needs of your specific pump service conditions. You might find the FSA (Fluid Sealing Association) guidelines helpful, or consider reaching out to a pump packing specialist for more personalized advice. Also, a hands-on seminar or training in mechanical pump packing could be invaluable for gaining the comprehensive understanding you're seeking. Balancing the critical aspects affecting pump reliability such as packing selection, installation techniques, adjustments, and maintenance can be quite a juggling act but with the right guidance, you can certainly achieve it.
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Answer: - Answer: When selecting pump packing for high solids applications, factors to consider include the material's resistance to abrasion, compatibility with the pumped media, ability to handle high temperatures, and durability for extended use.
Answer: - Answer: High carbon content packing can offer reduced cooling requirements and improved durability during removal in challenging environments with high solids applications like alumina hydrate.
Answer: - Answer: The clearance between the stuffing box and packing should typically be minimal, ensuring a tight fit to prevent product leakage. Proper clearance is crucial for maintaining seal integrity and preventing leaks.
Answer: - Answer: Product leakage from the stuffing box could be due to factors such as inadequate purge pressure, improper packing installation, worn components, or seal damage. It is essential to address these issues to prevent leakage and ensure optimal pump performance.
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