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Calculation of PFP Thickness

Thursday, 14 August 2014. Calculation of PFP Thickness. The thickness of fire protection required is determined by: Duration Critical Steel Temperature Steel section size and type Hp/A ratio Thickness stated in the local or international approval. SI Units: Hp/A = M/D = A/V =

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Calculation of PFP Thickness

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  1. Thursday, 14 August 2014 Calculation of PFP Thickness

  2. The thickness of fire protection required is determined by: • Duration • Critical Steel Temperature • Steel section size and type • Hp/A ratio • Thickness stated in the local or international approval

  3. SI Units: Hp/A = M/D = A/V = Imperial (US) Units: W/D = A/P = metres Heated Perimeter = = m-1 or /m metres² Cross Section Area Kilograms / metre Mass of Section = = kg/m² metres Heated Perimeter metres² Heated Surface Area = = m-1 or /m metres³ Volume of Steel Pounds/foot Weight of section = = lb/ft/in inches Heated Perimeter Cross Section Area Square inches = = in2/in Heated Perimeter inches All express the relationship between the amount of steel capable of absorbing heat to the area of steel surface exposed to the fire.

  4. How much PFP do I need? Hp/A - Section Factors Heated Perimeter (Hp = m) Cross Sectional Area (A = m²) Low Hp/A = Thinner PFP 305 x 305 x 240 kg/mHp/A = 1.905m / 0.0305m² Hp/A = 62 m-1 For H120 (400°C): Chartek 7 = 11 mm High Hp/A = Thicker PFP 305 x 305 x 97 kg/m Hp/A = 1.789m / 0.0123m² Hp/A = 145 m-1 For H120 (400°C): Chartek 7 = 16 mm

  5. How much PFP do I need? How Hp/A changes with sides exposed to fire. (Example 305 x 305 x240 Kg/m UC) Wall, Floor or Deck Wall, Floor or Deck Flange only exposed Hp/A= Hp/A = 13 m-1 3 Sides exposed Hp/A= Hp/A = 52 m-1 4 Sides exposed Hp/A= Hp/A = 62 m-1 0.393 m 1.587 m 1.905 m 0.0305 m² 0.0305 m² 0.0305 m² Note: Cross Sectional Area Remains the same in all cases!

  6. How to calculate an Hp/A? The Yellow Book! www.asfp.org.uk

  7. How to calculate an Hp/A?

  8. What do I do with my Hp/A? Chartek 7 Certificate Interchar 963 loadings Example of Certificate of Fire Approval with table of Hp/A v required PFP thickness

  9. What do I do with my Hp/A? Interchar 963 loadings

  10. What about other section shapes? Wall, Floor or Deck Wall, Floor or Deck Decreasing Hp/A = Lower PFP thickness required

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