GRAPHALLOY Bushings and Bearings

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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.

Thursday, June 16, 2016

GRAPHALLOY Tames "Bad Actor" Pump


A recent article in World Pumps magazine focused on a major oil refinery in Texas that was experiencing breakage problems with their vertical turbine pump. The plant’s engineers knew that there was a serious problem when the shaft broke twice - in exactly the same place - in less than three years.

The pump was a 4-stage, 14 GH Byron Jackson vertical turbine pump in isopentane service.  A thorough inspection and analysis by the pump repair shop revealed the underlying issue was not with the shaft itself but with the use of the wrong type of bearing materials.

As noted in the article - “Alloy Bearings Cure Breakage Problems” - the bronze bearings should have been able to withstand exposure to the isopentane being pumped. However, there was an occasional inflow of caustic soda which reacted with the bronze.

The bronze bearings were replaced with GRAPHALLOY® nickel-grade bearings. Since the repair, the pump has been operating efficiently for almost three years with no reports of any problems.

Based on a recommendation from an engineer at the refinery, a GRAPHALLLOY nickel-grade material that would withstand 400°C and offer self-lubricating and corrosion resistant properties was chosen. GRAPHALLOY bushings were installed into the stuffing box, column, bowl and suction bell bearing fits.

According to the sales engineer at the pump repair shop, “GRAPHALLOY is a material that is compatible with a wide range of pumped liquids and offers a good option in high temperature applications.”

GRAPHALLOY resists attack by most corrosive liquids including sulfuric acid, hydrochloric acid, chlorine water and caustics and can withstand high temperatures without deforming or burning.

To read the full article, please click here.