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CHM 605

CHM 605. Gas Safety & Electrical Safety. Gases physical dangers chemical dangers storage, handling & transportation regulators teflon tape and on and on. Electricity voltage & current recepts & switches cords tools equipment shutoffs procedures. Tables of Contents.

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CHM 605

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  1. CHM 605 Gas Safety & Electrical Safety

  2. Gases physical dangers chemical dangers storage, handling & transportation regulators teflon tape and on and on.... Electricity voltage & current recepts & switches cords tools equipment shutoffs procedures Tables of Contents

  3. Part I - Gas Cylinder Safety NOTE - The following points do not address the hazards or safety precautions pertaining to non-pressurized or low-pressure liquefied gases, i.e., cryogens.

  4. Gas under pressure • is an energy hazard • there are often chemical hazards too, but the energy hazard is NONTRIVIAL.

  5. Energy hazard you blow up or the room does maybe things catch fire too Chemical hazards vary widely poisoning "simple" or "chemical" asphyxiation subtle poisoning irritation Pressurized Gas Hazards

  6. Storage, handling, transportation • SEE HANDOUT "Gas Cylinder Safety." • “Gas cylinder” and “gas bottle” used to describe many different items.

  7. Regulators • Must use • No substitutions, no ingenuity allowed • No grease See also Aldrich Tech Bulletin AL-151 Air Products “Safetygrams”

  8. What about Teflon tape? • “Never tape CGA or compression fitting threads. Do tape NPT threads (three layers of PTFE tape).” • See air products whole answer (NPT = National Pipe) Thread (CGA = Compressed Gas Association) Did you receive “Gas Cylinder Safety” handout?

  9. Gas-tight lines • Know where to find the info about how to do it right. • “Fortunately most leaks don’t hurt us.”(we have plenty)

  10. “Demo Unit” • Go to web page to see better, maybe. • Assembled correctly.Blew out 3/8'' OD x.035" wall 304 stainless steel tubing at 14,000 psi (water)

  11. Part II - Basic Electrical Safety For lab staff and the people who work near them.

  12. "It's not the voltage ... • ... that kills you, it's the current." • True or False? • Both? • Why do people say this?

  13. Current • More than 3 ma • painful shock • More than 10 ma • muscle contraction “no-let-go” danger • More than 30 ma • lung paralysis- usually temporary • More than 50 ma • possible ventricular fib. (heart dysfunction, usually fatal) • 100 ma to 4 amps • certain ventricular fibrillation, fatal • Over 4 amps • heart paralysis; severe burns. Usually caused by >600 volts

  14. Switch • and cover plate • we take for granted • we miss it if it’s not there

  15. Receptacle • “Recept,” “outlet,” “socket,” “plug-in” • and cover plate. • This one is GFCI, required in many wet applications. GFCI = ground fault circuit interrupt

  16. Plug • What’s hot? • What’s not? • What’s missing here?

  17. Cords - always check for damage

  18. Tools and Equipment • Inspect power cords for damage • Check tools and equipment • Inexpensive devices exist for safely testing for grounding, and for finding a break in a circuit.

  19. Note • Circuit Breakers • Provided to protect EQUIPMENT not people • Do not reset a breaker (or replace a fuse) until you know why it tripped • Breaker box is your emergency shutoff. • GFCIs • Provided to protect people • Trip range 4-6ma • Monthly test

  20. Circuit panel ("service panel...") • Do not block panel. • Know where to shut it all off. • In a hurry. • Without having to move anything out of the way first.

  21. For any work involving design or construction of electrical equipment, standard procedures must exist and be followed. SOP This is supposed to be a mock-up of a standard operating procedure for design or construction of electrical equipment or elements. My plan is to make the text so tiny that it will not be at all possible to read, not by anyone in the audience or anywhere I could paste in some DOT hasmat table, or the paragraphs leading up to the table... A. But Instead I think I'll paste in some stuff from The web pages here and there. Enchilada tourney was originally started on the old Kilbassa site, but since it was almost complete, we decided to finish it here. We are currently in the finals, so if you want to see how your friends are doing, go to the Tourney Results Page B. It must be the season for 'puter problems (ain't it always!) but my monitor seems to be wearing out- after 12 years :/ So if I miss a few days - please be patient my friends. Kat 11/17/1999 8:54 am EST C. It must be the season for 'puter problems (ain't it always!) but my monitor seems to be wearing out- after 12 years :/ So if I miss a few days - please be patient my friends. Kat 11/17/1999 8:54 am EST It must be the season for 'puter problems (ain't it always!) but my monitor seems to be wearing out- after 12 years :/ So if I miss a few days - please be patient my friends. Kat 11/17/1999 8:54 am EST It must be the season for 'puter problems (ain't it always!) but my monitor seems to be wearing out- after 12 years :/ So if I miss a few days - please be patient my friends. Kat 11/17/1999 8:54 am EST Procedures (, standard operating)

  22. Electrical Safety Handout Use it. Ask questions. Those who missed the lecture will want to memorize most of it. Or maybe already know a lot of it.

  23. THANK YOU

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