Warnings on Use of Tubular Gage Glasses

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344 Market Road P.O. Box 138 Greenville, Wisconsin 54942

As a subscriber to Iron Men Album, I am writing to inform you of a potentially very serious safety hazard regarding the use of certain gage glass manufactured by Corning Glass Works, Corning, New York. Since Corning is a major glass supplier, I would venture to guess that the use of this glass is very wide spread among your subscribers. The glass is used in liquid level gages which are very common on steam boilers, among other uses.


To Users of Pyrex® Brand Industrial

High Pressure, Red Line and Green Line Tubular Gage Glasses

Corning Pyrex® brand industrial High Pressure, Red Line and Green Line Tubular gage glasses ('Gage Glasses') sold during the period April 1, 1987 to April 1, 1989, may contain stresses and/or cracks which could result in breakage. These stresses and cracks are found within two inches of the fire polished ends in these Gage Glasses, and may be present in all sizes and lengths, up to and including 72 inches.

Gage Glass breakage in applications involving pressure and/or flammable, corrosive or toxic materials can cause personal injury or property damage from flying glass or release of contained substances. To avoid these risks, read and follow the instructions and warnings below and always wear safety glasses when looking toward any type gage glass or working on glass assemblies.

Identify Gage Glasses and their Purchase Dates

This warning concerns only Pyrex® High Pressure, Red Line and Green Line tubular gage glasses purchased between April 1, 1987 and April 1, 1989. The original packages of these Gage Glasses are date coded on the label on the end of the packaging. However, individual Gage Glasses are not themselves date coded. If you cannot tell from your records whether particular Gage Glasses were purchased outside the period from April 1, 1987 to April 1, 1989, the Gage Glasses should be replaced as described in this warning.

Inventory Replacement

Do not install existing Pyrex® Gage Glasses from your inventory (for replacements or otherwise), unless purchased before April 1, 1987 or after April 1, 1989. Return them to your distributor or supplier for free replacements. Contact your distributor or supplier for instructions.

In-Use Gage Glasses Which Should Be Replaced

If you have any Gage Glasses purchased between April 1, 1987 and April 1, 1989 installed in pressure applications exceeding 25 PSI, or in applications involving flammable, corrosive or toxic materials, you should take the following actions.

1.  Warn and protect personnel.

Warn maintenance and other personnel who may service or be in the vicinity of these gages of the possibility of unexpected breakage and resulting risks.

Post copies of this warning.

Keep untrained and unprotected people away from these gages.

2.  Replace in-use Gage Glasses.

Using only replacements obtained from supplier or distributor, remove and replace currently installed Gage Glasses. Observe instructions described below, the gage manufacturer's instructions, and the Corning Use and Care instructions.

Do not service, replace or examine any in-use Gage Glasses without shutting off pressure and wearing a face shield and other suitable body protection. Remember the system may remain pressurized after shut-off and must be drained before removing a Gage Glass.

If there is a delay in obtaining replacement Gage Glasses, leave the currently installed Gage Glasses in service, but restrict access to the Gage Glasses to trained personnel who have read and understood this warning and are properly protected.

Certain Gage Glasses not requiring replacement

The following Gage Glasses do not require immediate replacement, but replacement should be made as required by routine maintenance schedules:

Gage Glasses in flow, level-indicator or other installations with pressures at or below 25 psi which do not contain flammable, corrosive or toxic materials.

Gage Glasses in installations where personnel and equipment are protected by adequate shielding.

Gage Glasses which (i) are greater than 72 inches in length; or (ii) had the fire polished ends removed by your distributor after March 15,1989 (these will be marked as described in the following paragraph).

Replacement Gage Glasses and Use and Care

Replacement Gage Glasses can be obtained under this program from your distributor at no cost until December 31, 1989. Such replacements will be identified by a black or colored marking on the end, or by a line along the length of the Gage Glass. In using any gage glass, always follow the Corning Use and Care instructions.

If you have any questions, call Corning toll-free 1-800-552-7105 Monday-Friday 8:00 a.m.-5:00 p.m. (Eastern time), or write: Corning Glass Works, Industrial Supplies Department, MP-21-01-4, Corning, New York 14831.