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GMIC Safety in Glass Plants
Glenn Aspholm
Personal Protective Equipment (PPE) For Electric Furnace Operation
Glenn S. AspholmJohns-Manville CorpLittleton, ColoradoOctober 24, 2005
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GMIC Safety in Glass Plants
Glenn Aspholm
JM Melting Operations
• Gas-Oxy • Gas-Oxy w/ Electric Boost• SORG Technology • Modified Pochet-Style All-Electric Melters• All-Electric Forehearths
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GMIC Safety in Glass Plants
Glenn Aspholm
Additional Risks For Pochet Melters
• Open Glass Streams• Operator Close to Melter – Open Glass Surface• Required to Probe Glass
– Melter Level Measurement
• Ladle-Check Glass Flow Measurements• Equipment Change and Maintenance
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GMIC Safety in Glass Plants
Glenn Aspholm
Additional Risks For Electric Forehearths
• Infrequent Glass Level Measurement– Level-Gauge Calibration– Level-Gauge Failure – Upset Condition / Verification
• Thermocouple Change• Low – Maintenance, Trouble-Free Operation
– Forget the Risks !!!
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GMIC Safety in Glass Plants
Glenn Aspholm
In-Scope
• General Operator Duties• Glass Level Measurement (Melter)• Glass Level Measurement (Forehearth)• Glass Pull Rate Measurement (Ladle Checks)• Thermocouple Change - Forehearth
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GMIC Safety in Glass Plants
Glenn Aspholm
Out-Of-Scope
• Electrical / Mechanical Maintenance• High-Voltage / Low-Voltage Electrical Work• Emergency Conditions
• If in doubt, Lock it Out !!!!
• Not a replacement for proper Lock-out/Tag-out Procedures
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GMIC Safety in Glass Plants
Glenn Aspholm
Melter Level Measurement
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GMIC Safety in Glass Plants
Glenn Aspholm
Open Glass Stream
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GMIC Safety in Glass Plants
Glenn Aspholm
Electric Forehearth
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GMIC Safety in Glass Plants
Glenn Aspholm
Risks Around Electric Melters/Forehearths
• Thermal (Burn)• Abrasion (Cut / Scrape)• Contact with Molten Glass• Low Voltage Electrical• High Voltage Electrical
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GMIC Safety in Glass Plants
Glenn Aspholm
Melter and Forehearth Electrical Potential
• Melter - < 100 V AC• Forehearth - 50 – 100 V AC
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GMIC Safety in Glass Plants
Glenn Aspholm
Burn / Abrasion PPE
• Bump Caps / Hard Hats• Proper Clothing• Leather Gloves• High – Temperature Clothing and Gloves• Head Protection and Faceshield
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GMIC Safety in Glass Plants
Glenn Aspholm
Low Voltage Electrical Shock Risks
• Electrical Shock – Injury / Death• Secondary Injury – Reaction from Electric Shock
– Fall– Burn– Head Injury– Laceration/Abrasion/Fracture
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GMIC Safety in Glass Plants
Glenn Aspholm
New Requirement - Use of Linesman’s Gloves and Protectors for Normal Operator Functions
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GMIC Safety in Glass Plants
Glenn Aspholm
Available Linesman’s Gloves
Class Proof Test (V) AC Max use Volts
00 2500 500
1 5000 1000
2 10000 7500
3 20000 17000
4 30000 26500
5 40000 36000
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GMIC Safety in Glass Plants
Glenn Aspholm
Lineman’s Glove Info
• Di-Electric Rubber Construction• Seamless• ASTM D120 Specification• Must be tested and certified every 6 months
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GMIC Safety in Glass Plants
Glenn Aspholm
Current Specified Equipment
• 00 Linesman’s Gloves• Leather Protectors• Order proper sizes – Probably oversized
• Cost - Approx $75/set (Glove + Protectors)• 6-Month Certification Required
– Pay Certification cost– Replace after 6 months
• Source of Information - McMaster-Carr Catalog
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GMIC Safety in Glass Plants
Glenn Aspholm
Questions ???