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2. Positive pressure enclosure - Wikipedia

   en.wikipedia.org/wiki/Positive_pressure_enclosure

   A positive pressure enclosure, also known as a welding habitat or hot work habitat, is a chamber used to provide a safe working environment for performing hot work in the presence of explosive gases or vapors. They are commonly used in welding environments and are associated with the offshore oil industry. [1]

3. Heat and smoke vent - Wikipedia

   en.wikipedia.org/wiki/Heat_and_smoke_vent

   The majority of guidance available for design of heat and smoke building vents installed in buildings is restricted to nonsprinklered, single-story buildings. [4] This is partly a historical consequence of the installation of heat and smoke vents following the August 1953 General Motors, Livonia, MI major fire in a nonsprinklered manufacturing facility which effectively stopped the production ...

4. List of welding codes - Wikipedia

   en.wikipedia.org/wiki/List_of_welding_codes

   Covered electrodes for manual arc welding of stainless and other similar high alloy steels - Code of symbols for identification ISO 3834: Quality requirements for fusion welding of metallic materials, five parts. ISO 4063: Welding and allied processes - Nomenclature of processes and reference numbers ISO 5817: Welding.

5. Occupational Safety and Health Administration - Wikipedia

   en.wikipedia.org/wiki/Occupational_Safety_and...

   The Occupational Safety and Health Act grants OSHA the authority to issue workplace health and safety regulations. These regulations include limits on hazardous chemical exposure, employee access to hazard information, requirements for the use of personal protective equipment, and requirements to prevent falls and hazards from operating ...

6. Welding Procedure Specification - Wikipedia

   en.wikipedia.org/wiki/Welding_Procedure...

   The American Society of Mechanical Engineers (ASME) similarly defines a WPS as a written document that provides direction to the welder or welding operator for making production welds in accordance with Code requirements. [2] ASME also defines welding PQR as a record of variables recorded during the welding of the test coupon. The record also ...

7. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   The presence of forced ventilation systems has been shown in some cases to actually increase the humidity rather than lower it. [14] By displacing air inside a dwelling with infiltrated air (air brought in from outside the dwelling), positive pressure ventilation systems can increase heating (in winter) or cooling (in summer) requirements in a ...