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Calculation of the pipe wall thickness for strength


initial data Liquid Water Estimatedwall temperature +5оС material: AISI 304 Subsea pipeline An increase to the wall thickness Operating gain pipe outer diameter of 133 mm or more C21 =3 mm. The estimated thickness of the pipe wall tc = p0Da/(2σφ) +c1+c2= 0,913·133/(2·173.73·1)+0.45=0,8 mm where
p0 – design pressure in the conduit, MPa,
p0 = (pi – pg min) + Δ p=1,0-0,087=0,913 MPa,
pi =1,0 MPa – the internal operating pressure of the pipeline;
pg min – minimum external hydrostatic pressure in the pipeline, MPa;
Δ p – additional pressure is calculated taking into account the pressure medium breakaway transported in the pipeline and / or water hammer pressure in the pipe, MPa.
pg min= ρw · g · (dmin – hw / 2) · 10–6=999,99 · 9,81 · 8.9 · 10–6=3,27 м=0,087 MPa;
where ρw =999.99 kg/m3, density of the water;
g =9,81 m/c2 – acceleration of gravity;
dmin =8.9 m - the minimum level of quiet water along the pipeline route, taking into account the tidal conditions and surges with the provision 10–2 1/year;
hw =0 m, the estimated wave height on the projected area of the pipeline;
Da =133 mm - outer diameter of pipe.
Allowable stress σ must be made equal to the lower of:
σ = min (Ry/ny , RT/nT),
where Ry=205 MPa - the minimum value of the yield strength of the metal pipe;
RT=510 MPa the minimum value of the tensile strength of the metal pipe;
ny=1,18 - safety factor of yield strength;
nT=1,75 safety factor for tensile strength.
σ = min(205/1,18 , 510/1,75)
σ = min(173,73 , 291,43);
φ – safety factor, determined according to the method of manufacturing a pipe, a safety factor of φ is taken equal to 1.0 for seamless pipes.
c1 =0 mm, – corrosion allowance for subsea pipelines made of stainless steels and alloys;
c2 =0,45 mm – gain compensating manufacturing tolerances for manufacturing pipes, mm.
Calculated taking into account the thickness of the wall of increases tc + C21 =0,8+3=3,8 mm
The wall thickness of the pipe diameter 133 mm accepted 4 mm.


1.РД 10-249-98 "Нормы расчета на прочность стационарных котлов и трубопроводов пара и горячей воды"
2.Правила классификации и постройки морских подводных трубопроводов Российского морского регистра судоходства от 28.02.12.

Chief technical designеr Priymak Victor

Calculation of the pump unit

initial data liquid water temperature t =5оС; density of water ρ=999,99 kg/m3; kinematic viscosity of water ν=0,0152 cm2/s; Hydraulic calculation of pipelinePipe diameters are determined by the recommended a calculated rate of water movement in them. The calculated velocity is adopted in accordance with the Table
Pipe diameters, mmRecommended the calculated velocity of water in the pipes, m/s
in the suction linein the discharge line
≤ 2500,7…1,00,8…2,0
> 8001,2…2,01,5…4,0
Calculated pipe diameter suction line. The average velocity of the fluid V=0,7…1,0 m/s, d1=(4Q)0.5/(π∙V)0.5=(4∙0.061)0.5/(π∙0.7)0.5=0.333 m d1=(4∙0.061)0.5/(π∙1)0.5=0.279 m Estimate the diameter of the pipe, the pressure line V=0,8…2,0 m/s d2=(4∙0.061)0.5/(π∙0.8)0.5 =0.311 m d2=(4∙0.061)0.5/(π∙2)0.5 =0.197 m where Q =0,061m3/s– pump performance (specified flow rate); Rated power at the pump shaft NВ=ρ•g•Q•H•10-3/η=1000•9,81•0,061•53•10-3/0,7= 45,39 kW, where g =9,81m/s2— acceleration of gravity; H = 53 m – pump design head;
η - pump efficiency. Estimated nominal motor power Nm=NВ/(ηc•ηm)=45,39/(0,96•0,92)=51,39 kW, where ηc - Coupling efficiency; ηm - motor efficiency. Rated power of the motor mounting Nmount=β•Nm= 1,2•51,39 = 61,67 kW, where β=1,2 - power factor of safety for the pressure line pipe diameter 0,2 m. Victor Priymak Chief technical designеr.


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