Safe Distance Calculation Hydrotest [PDF]

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SAFE DISTANCE CALCULATION HYDROTEST



As per rules for Pressure testing Lloyds register (96-02)



Calculation of minimum safety distance for pressure testing (LLOYDS Register 96-02) form T-0240 sections 3.3 (fluid)



L = 0.15 x D x α 0.4 x (P / ∛ρ)0.6 L



Minimum Safety Distance, Meter



D



Internal diameter, Meter



P



Test Pressure, Bar



ρ



Density of Test fluid, Water , 1000 kg/m3



α



Safety Factor, Length of System/Internal Diameter.



l



Length of System



Safe Distance Calculation for Riser’s combined: Riser Combined Length: l = 257.301 meter L



Minimum Safety Distance, Meter = ?



D



Internal diameter, Meter = 0.3686 m



P



Test Pressure, Bar = 115.5 bar



ρ



Density of Test fluid, Water , 1000 kg/m3



α



Safety Factor, Length of System/Internal Diameter.



l



Length of System = 257.301 m



L = 0.15 x D x α 0.4 x (P / ∛ρ)0.6 L = 0.15 x 0.3686 x (257.30 / 0.3686)0.4 x (115.5 / ∛1000/1000)0.6 L = 13.11 meter



Safe Distance Calculation for Spool-1 combined: Spool-1 Combined Length: l = 121.722 meter L



Minimum Safety Distance, Meter = ?



D



Internal diameter, Meter = 0.3686 m



P



Test Pressure, Bar = 115.5 bar



ρ



Density of Test fluid, Water , 1000 kg/m3



α



Safety Factor, Length of System/Internal Diameter.



l



Length of System = 121.722 m



L = 0.15 x D x α 0.4 x (P / ∛ρ)0.6 L = 0.15 x 0.3686 x (121.722 / 0.3686)0.4 x (115.5 / ∛1000/1000)0.6 L = 9.72 meter.



Safe Distance Calculation for Spool-2 combined: Spool-2 Combined Length: l = 95.05 meter L



Minimum Safety Distance, Meter = ?



D



Internal diameter, Meter = 0.3686 m



P



Test Pressure, Bar = 115.5 bar



ρ



Density of Test fluid, Water , 1000 kg/m3



α



Safety Factor, Length of System/Internal Diameter.



l



Length of System = 95.05 m



L = 0.15 x D x α 0.4 x (P / ∛ρ)0.6 L = 0.15 x 0.3686 x (95.05 / 0.3686)0.4 x (115.5 / ∛1000/1000)0.6 L = 8.81 meter.