.: TECHNICAL CALCULATIONS AND RELEVANT TABLES :.

• STANDARD SIZE RATIO: SDR
  SDR= OUTSIDE DIAMETER (ø mm) / WALL THICKNESS (s mm)
• HIDROSTATIC DESIGN STRESS : (σ)
  σ=MRS/C (Mpa)
• HIDROSTATIC PRESSURE (NOMINAL PRESSURE) (P)BAR
  P=(2 σ x s ) / (D-s) Bar
  P= σ (MRS) / σ(hid.) x C Bar
  1 Mpa = 10 Bar
• POLYPROPHYLENE PIPE WALL THICKNESS
  S=(PxD) / (2 σ + P) mm