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



ASTM A516 Steel Plate A516GR70,A516GR.70,A516 Grade 70 steel plate A516GR70 Gangsteel Grade : Thickness 5mm-200mm, Width: 1500-4020mm, Length: 3000-27000mm Normalized rolled weldable fine grain structural steels Gangsteel is specialized in supplying ASTM steel plate in A516 Grade 70. For more information of A516gr70 steel plates, please check them in following: A516gr70 Chemical composition % of the Product analysis of grade A516GR70 . A516GR70 Chemical Composition Mechanical properties of grade A516GR70 Equivalent grades of grade A516GR70

Хороший выбор строительного материала для дома и домика на даче - высококачественные пеноблоки или газобетонные блоки! Будпостач - газобетон купить киев

Наилучший вариант стройматериала для частного дома и домика на даче - газобетон или пеноблок! Будпостач - производство пеноблоков в домашних условиях видео

Бурение на-воду в Минске от компании Vodabur Водабуртехно по адекватным нормальным ценам. Информация на канале бурение скважин разрешительные документы 【杰瑪眼鏡】桃園最專業的眼鏡行─桃園眼鏡│桃園墨鏡│桃園配眼鏡│桃園眼鏡保養

Add new comment