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NFPA 86 states " 8.16.3   Operation of the excess temperature limit interlock shall cut off the heating system before the oven's maximum temperature, as specified by the oven manufacturer, is exceeded." Does the excess temperature here refer to the flue gas temperature? What if the shutdown is implemented on the process fluid outlet temperature… (Show more)
in Industrial Hazards
I'd like to know where I can find the 2020 updates of the NFPA 51B Standard for fire prevention during welding, cutting, and other hot work. Thanks. 
in Industrial Hazards
In table 307.1 (1) under flammable liquids storage, if both note "d" and "e" apply, does this mean that you can double the initial amount (120 gallons) to 240 gallons, and then double that amount (240 gallons) to 480 gallons of storage, as it is calculated "accumulatively"?   Or is the MAQ only 360 gallons of storage?    Any help would be… (Show more)
in Industrial Hazards
Hello Xchange   I have a question regarding NFPA 407. If a loading and unloading rack for an exiting fuel farm is located outside the perimeter fence ( the tank still inside the plant). It is required to have a perimeter fence? NFPA 407 states in Chapter 5, 5.2.1 Access to fuel storage and fuel vehicle loading areas shall be secured. Annex A… (Show more)
in Industrial Hazards
Hello,  I am looking for information on how to take exception to NFPA 86 explosion relief requirements for Class A & B Natural Gas fired Ovens. My situation: I have an oven that cannot physically meet the 15 to 1 ratio relief area requirement because of external structure and internal components? Is there a form or process to use to take exception… (Show more)
in Industrial Hazards
Hi I have been working in 1 project about conveying system for Sulphur in Sulphonation plant. I have been checking for some information about assessment due to combustible dust / flameable gas due to this work. I am looking from NFPA 655 what things need to be checked to prevent & protect for fire&explosion in handling Sulphur.   So basically… (Show more)
in Industrial Hazards
Hello my name is Michael Polito,   I'm a Plant Operations Manager at a hospital and I'm inquiring about adding blood bank refrigerator/freezer temperature alarms alarm through our main medical gas alarm panel that is monitored 24/7.  Does anyone know if it's acceptable to have blood bank refrigerator and or freezer alarms send a closed contact… (Show more)
in Industrial Hazards
Hello all, What course of action should you take if all 3(three) "Special Hazards" are present in your building? I realize that if a substance is both an oxidizer and reactant to water you put -W-(lets pretend the line continues through the W) in the quadrant and OX below or next to the quadrant for an oxidizer, but in the lab we also have… (Show more)
in Industrial Hazards
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