GRAPHALLOY Bushings and Bearings

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Wednesday, February 7, 2018

Coal-Fired Power Plant Slashes Maintenance Time with GRAPHALLOY Bushings

The conditions inside of a coal-fired power plant can place heavy stress on components. The dampers and burners have to deal with high temperatures and the presence of particulate. Bearings functioning in this environment have to be durable and must be able to operate without frequent maintenance.

This was not the case at one North American coal plant. The plant manager and his staff spent too much time maintaining the bearings inside the wind boxes that control the air supply to the combustion process. The bearings still failed regularly despite hours of work each week. Bearing failure meant that the combustion mix had fluctuated, leading to damaged boiler tubes, higher emissions and increased fuel costs.

By switching from lubrication-hungry roller-element bearings to GRAPHALLOY self-lubricating bushings, the plant greatly reduced maintenance demands while achieving a more predictable combustion mix. Click here to read more...

Tuesday, January 16, 2018

GRAPHALLOY Upgrade Improves MTBF of Refinery's Storm Water Pumps

Engineers at a U.S. refinery’s wastewater treatment plant upgraded the bronze bearings on their vertical turbine pumps in wastewater service to GRAPHALLOY® bushings and solved their packing failures.

This refinery was experiencing frequent bearing failures in their single-stage vertical turbine wastewater pumps. The bronze stuffing box bearing often failed which allowed shaft movement and, in turn, put stress on the packing. This caused the packing to quickly wallow out resulting in a leaking packing.

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Wednesday, November 1, 2017

GRAPHALLOY® Bearings: Installed and Forgotten for Over 20 Years!

More than 20 years ago, a major chemical manufacturer was experiencing frequent failures of their pumps in ethylene service. They had (and have) six 15-stage Pacific vertical can pumps installed and one spare. Each pump has fourteen inter-stage assemblies, and head and lower bearing assemblies.

These pumps were originally fitted with bronze bearings which were failing within
one month of installation. Ethylene is a very light hydrocarbon that creates problems in pump operation. Because of its low viscosity, ethylene provides minimal lubrication to the rotating parts of the pump. As a result, these pumps are prone to failure when running with bronze bearings.

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Wednesday, October 11, 2017

Andrew Ondish Joins Sales Team at Graphite Metallizing

Graphite Metallizing Corporation, the manufacturer of self-lubricating GRAPHALLOY® bushing materials for pumps and process equipment, has appointed Andrew Ondish as Territory Sales Manager for New Jersey, Eastern Pennsylvania, Delaware, Maryland and Eastern New York.

Ondish holds a B.S. degree in Petroleum Engineering from Colorado School of Mines. With nearly thirty years of experience in sales and engineering, he previously served as Regional Sales Manager at Grundfos Pumps, Regional Sales Manager for Hazleton Pumps and Product Engineer for Sundyne Corporation. Ondish was also a commissioned officer in the Army Reserve.

“We are pleased to have Andy join our team,” said Eben Walker, General Manager of Graphite Metallizing. ”His extensive experience with industrial machinery will help our customers use GRAPHALLOY to achieve greater equipment reliability.”

Graphite Metallizing Corporation of Yonkers, NY has been solving tough bearing problems for over 100 years. The company began in 1913 when two engineers developed a method for putting molten metal into carbon to create a new material called GRAPHALLOY, a graphite/metal alloy.

Used in the manufacture of bushings, bearings and other components for machinery and process equipment, GRAPHALLOY can be the solution to the toughest bearing, bushing, thrust washer, cam follower, or pillow block bearing design problem. It is available in over 100 grades with specific properties that meet a wide range of engineering solutions and specifications. FDA accepted grades of GRAPHALLOY are available for use in food service equipment. NSF® International has certified two grades of GRAPHALLOY material for use in municipal well pumps and water treatment plant applications.
GRAPHALLOY bearings have operated for 20 years and longer in some applications. Standard designs are available but most GRAPHALLOY products are custom designed to the unique requirements of the specific application. Graphite Metallizing Corporation is ISO certified. For more information about Graphite Metallizing and its products, please visit us online at or call 914-968-8400.

Tuesday, September 26, 2017

GRAPHALLOY® at Heat Treat 2017

Graphite Metallizing Corporation will be exhibiting at the 29th Heat Treating Society Conference & Exposition on October 24 - 26, 2017. This exhibition will be held at the Greater Columbus Convention Center in Columbus, Ohio.

Please stop by and visit us at Booth #2132.

To learn more about this exhibition, click here.

Wednesday, September 6, 2017

GRAPHALLOY® Upgrade Saves Boiler Feed Pump

Keeping a multistage boiler feed pump operating was a problem for a gas plant...until they installed GRAPHALLOY bushings and wear rings.

A large industrial gas supplier in the southeastern United States experienced a catastrophic failure of a horizontal 8-stage, axially split, BB3-type multistage pump in Boiler Feed Service. The pump had been fitted with a plastic composite (Teflon®/Carbon Fiber) material for the stationary wear rings and bushings.

They contacted Graphite Metallizing and invited one of our engineers to visit their repair shop to examine the failed pump and recommend a GRAPHALLOY upgrade.

Here is what he saw: the throttle bushing showed the most wear. The sleeve under the throttle bushing was worn with radial grooves that appeared to be from contact with the stationary (plastic composite) wear part. However, in this case, the center stage (typically the first part to fail in a dry run episode or low viscosity transient) was fine while all of the hub side composite inserts were missing and the eye side inserts were unaffected. This tells us that we were looking at a completely different issue.

The engineers agreed that the cross section of the throttle bushing was so thin (only approximately 3/16 inch per side) and the pressure against the face of the bushing was so high that it deformed the plastic composite material causing it to move toward the ID.

The reduced clearance caused the bushing to ride onto the throttle sleeve. The friction and pressure caused the plastic composite material to melt and “blow out” the low pressure side. Once the throttle bushing was lost, the rotor lost its hydraulic balance within the case causing the rotor to shuttle towards the one end. The axial movement separated the mechanical seal faces and overloaded the bearing causing the pump to shut itself down. There was evidence the seal had leaked and the bearings showed signs of having thrust in one direction.

The Graphite Metallizing engineer recommended replacing the hub rings, center and throttle bushings, and eye side rings with nickel-grade GRAPHALLOY. The GRAPHALLOY material was ordered, shipped next day, installed and the pump was quickly put back into service. The pump has been in service now for over four years with no further problems.

The plant engineer explained that GRAPHALLOY was chosen because of successes with other pumps at this site and also for providing fast turnaround on both the quotation and replacement parts.

To learn more about GRAPHALLOY pump bushings and wear parts, please click here.

Monday, August 7, 2017

GRAPHALLOY® Solves Frequent Failures in Petrochemical Plants’ Multi-Stage Pumps

GRAPHALLOY self-lubricating bushings and wear rings are non-galling, withstand high temperatures, and are compatible with a variety of harsh chemicals. One petrochemical manufacturing plant greatly improved MTBF by converting two pumps in Tert-Butyl Alcohol service to GRAPHALLOY. These multistage pumps are used to transfer TBA at a temperature of 110°F.

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