GRAPHALLOY Bushings and Bearings

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Tuesday, July 11, 2017

GRAPHALLOY® Keeps Dryer Oven Chains Rolling

Keeping their gypsum board dryer oven running was a problem for a manufacturer of construction materials until they redesigned the chain guide to include self-lubricating GRAPHALLOY® cam followers.

The oven has a drag chain conveying system - with a speed of eight feet per minute - to move the gypsum wall boards through the oven. The temperature in the oven is 550°F. The drag chain was kept on track by chain guides made of carbon steel plates. Over time, the chain guides would wear down, fall onto the gypsum wall boards, destroy the product and shut down the oven. 

The manufacturer wanted to design a chain guide system that would not wear down and certainly not fall into the product. They needed something to support the chain. The manufacturer considered using standard cam followers but was concerned that they wouldn’t survive the oven’s high temperature. In addition, they wanted to avoid using grease to minimize frequent maintenance.

They contacted engineers at Graphite Metallizing Corporation to help with the new design. Self-lubricating GRAPHALLOY Bronze Grade Cam Followers Type 1217 were proposed. The manufacturer then developed a chain guide system that had the chains roll over the cam followers instead of the steel plates.

After testing this solution for ten months, the board manufacturer declared it a success. They converted their entire oven to GRAPHALLOY. These cam followers have now been in operation for over one year without the need for replacement. The manufacturer also saved time and money on reduced maintenance because they no longer need to grease their bearings.

To learn more about GRAPHALLOY Cam Followers, please click here.

Thursday, June 8, 2017

Molten Sulfur Pump Vibration is No Match for GRAPHALLOY® Iron-Grade Bearings

At a major refinery, vertical molten sulfur pumps were fitted with nickel-chromium (Ni-Cr) bearings to handle the high-temperature environment.  To avoid seizing and galling, the line shaft and volute bearings were fit with 0.020 – 0.025” running clearance. However, the pumps were experiencing high vibration, approaching 1.0 inches/second peak. When they disassembled the pump, the bearing clearances had opened up to 0.030 – 0.034”.

The customer contacted one of our engineers and asked: "How well do the
GRAPHALLOY sleeve bearings fare in liquid sulfur service? There are eight vertical column pumps in our sulfur pit..four of which are quite the trouble-makers when it comes to high vibration. Vibration data usually indicates some sort of imbalance. Any feedback is greatly appreciated as this definitely sounds like a product worth pursuing to "dampen" the current vibration in these pumps."

Click here to read more.

Monday, May 1, 2017

Improve Pump Reliability in Light Hydrocarbon Service

The unique properties of GRAPHALLOY® bushings and wear rings enable pumps to run-dry and survive upsets and flashing that cause metal-to-metal pumps or plastic wear parts to fail.

These bearings allow closer running clearances which can provide higher pump efficiencies.

Read more...

Wednesday, March 15, 2017

Desalination Plant Pumps Upgraded with GRAPHALLOY NSF® Certified Bearings

A major pump manufacturer’s Water Systems Group, which focuses on the commercial and industrial water markets, won a contract to provide vertical turbine pumps for a desalination facility at a publicly-owned water agency.

The pumps would experience dry starts with the possibility of prolonged dry running. In addition, the bearings needed to be NSF certified. These conditions led the pump company to replace their standard bronze bearings with GRAPHALLOY NSF certified bearings.

The unique properties of GRAPHALLOY bearings and wear rings enable pumps to run dry and survive upsets and flashing that cause metal bearings to fail.

Read more...

Wednesday, February 15, 2017

GRAPHALLOY Solves Underwater Bearing Problems on Submerged Physical Therapy Equipment

Graphite Metallizing has introduced a series of stainless steel pillow blocks fitted with self-lubricating GRAPHALLOY® bushings that resist attack from water and water-soluble chemicals, do not require lubrication and are corrosion-resistant.

GRAPHALLOY® Stainless Steel Pillow Blocks are a key component of submerged physical therapy and conditioning equipment used by professional sports teams and college athletic departments. The ability of GRAPHALLOY bearings to provide trouble-free underwater operation without any lubrication has been a key factor in the success of this type of equipment, including underwater treadmills. Read more...

Monday, January 30, 2017

GRAPHALLOY Outperforms Traditional Bearings and Bushings in Ovens, Kilns and Dampers

GRAPHALLOY®, a graphite/metal alloy, is ideally suited to applications where temperatures are too high to permit the use of oil or other lubricants.

GRAPHALLOY bearings and bushings will not soften at high temperatures or extrude under load. Many grades are suitable for temperatures to 750°F (400°C) in air. In addition, special grades provide service up to 1000°F (535°C) and higher in non-oxidizing atmospheres.

Use GRAPHALLOY bearings and bushings in bakery and industrial ovens, glass plants, conveyors, dryers, kilns, kiln cars, stokers, soot blowers, oil guns, gypsum board and veneer dryers ...wherever temperatures are too high to permit the use of oil or greases.

Click here to learn more about the GRAPHALLOY product line for extreme and high temperatures. 

Monday, September 12, 2016

GRAPHALLOY® at Turbomachinery and Pump Symposia

Graphite Metallizing Corporation will be exhibiting at the 45th Turbomachinery and 32nd Pump Symposia (TPS) from September 12 - 15. This exhibition will be held at the George R. Brown Convention Center in Houston.

Please stop by and visit us at Booth #1414.

To learn more about this exhibition, click here.