Please enable JavaScript.

Coggle requires JavaScript to display documents.

Valve Actuator Fireproofing - Coggle Diagram

- - - - protection levels up to 2,100°F (1,149°C) for 30 minutes.
      - easy to install
      - systems remain intact through the duration of the exposure to fire
      - easy to remove and re-install for inspections
      - block the flame path and transfer heat
      - can be repaired in the field
      - weatherproof and robust, but lightweight and cost effective
      - designed to contain actuator, gear box and other plant equipment
      - Flexible protective jacket enclosure systems offer a compact fireproofing solution for both actuator and related plant equipment
    - - design of these systems needs to be based upon the industry-approved graph of hydrocarbon fire versus temperature curve
      - The construction of these enclosures will vary with different actuators based on the actuator’s thermal mass, physical configuration and limiting surface temperatures.
      - consists of a steel sub-frame enclosed in a body of 8 pounds per cubic feet density silicate fiber blanket encapsulated to the inner (cold) face with 11.8 ounces per square yard (oz/yd2) glass cloth and to the outer (hot) face with 41.3 oz/yd2-weight wire-reinforced cloth Both of these cloth elements should be coated with an elastomeric membrane to provide environmental protection. Alternatively, the enclosure may be tailored to fit directly onto the actuator body
      - Acceptable semi-rigid enclosure systems should be tested to UL1709 at a recognized research center to document that the enclosure can provide protection for the actuator for 30 minutes at up to 2,000°F (1093°C)
      - Individually tailored designs can minimize physical space requirements
      - low maintenance needs
    - - constructed using high thermal performance materials encapsulated within stainless-steel skins
      - protect against flame temperatures in excess of 2,200°F (1,204°C)
      - resist both blast and jet fires
      - provide up to 120 minutes of protection
      - withstand blast overpressure
    - - effective in protecting against fire through basic thermodynamic principles and can provide superior protection and convenience. Without protection, a typical metal surface will reject about 20% of the heat of the fire. With an intumescent coating, 80–90% of the heat can be repelled. These coatings, provided by specialty manufacturers with proprietary formulations, are molded to the actuator.
      - When exposed to fire, the coating undergoes an endothermic reaction creating an expanded outer layer of lava-like char. The char layer has a very low thermal conductivity coefficient—the surface temperature of the char rises to within 100°F (38°C) of the fire. After the char layer is formed, the coating then remains passive, providing insulation and reflecting heat away from the actuator. Additionally, moisture is released during the process, drawing heat away from the layers below.
        After a period of time, the heat penetration through the char reaches a level at which the coating material below is activated to form another char layer. This process is repeated several times as heat slowly penetrates and forms subsequent layers of char. These heat-transfer characteristics result in a very effective thermal barrier.
      - protect for more than 30 minutes in 2,000°F (1093°C) fires
      - original actuator features are intact and accessible
      - can exceed ANSI/API 607 and UL 1709
      - provide fixed passive fire protection
      - permanently molded to the actuator and gear box
      - coating is chemically inert