According to the formula L=l+b/2=(H-h)/tanα+B, where H is the depth of pipe groove (trench), m;H is the building foundation depth, m;αInternal friction angle of soil, radian;B is the width from the pipeline center to the outer edge of the trench bottom, m;L is the minimum distance of pipeline laying, m;L is from the edge of the building foundation to the bottom of the trench or the edge of the pipe trench foundation
This online calculation program is used to calculate the minimum distance of pipeline laying during pipe excavation according to the formula L=l+a/2=(H-h)/tanα+A/2
According to the axial temperature drop formula (Lebinzon formula), ignoring the change of hydraulic gradient i along the pipe length, K is a constant, ignoring the effect of friction heat, calculate the oil temperature at the distance L.This program can also calculate the mass flow, pipe diameter, heat transfer coefficient, outgoing oil temperature and other values to achieve mutual calculation of eight parameters.
When K, D and T0 are fixed, the allowable minimum throughput of the hot oil pipeline is determined when the space between heating stations lR, the allowable maximum outgoing oil temperature TOUTmax and the allowable minimum incoming oil temperature TINmin of the heating station are fixed.This formula is only applicable to the case where the friction heat has little effect and there is no phase change.
According to the relative equivalent roughness formula of pipelineε=2e/d e is the absolute equivalent roughness, which refers to the statistical average of the bulge height of the inner wall of the pipe, and the unit is m;D is the inner diameter of the pipe, in m;εIs the efficiency, and the unit is 1
Calculate the average temperature (oil temperature) according to the starting oil temperature and the ending oil temperature of the oil pipeline.The other temperature can also be calculated by knowing any two of them, that is, the starting oil temperature, the ending oil temperature and the average oil temperature can be converted each other.It also supports arbitrary selection and switching of temperature units
On line calculation of Reynolds number flow velocity kinematic viscosity hydraulic diameterWhere u is the velocity, m/s;D is the hydraulic diameter, m;νIs kinematic viscosity, m2/s;Re Reynolds number
Calculate according to the calculation formula of frictional head loss (Darcy formula), where L is the pipe length, m;D is the pipe inner diameter (characteristic length, hydraulic diameter), m;V is the velocity, m/s;λIs the hydraulic friction coefficient;Hf is the head loss along the way (frictional resistance along the way), m
Speed diameter flow calculation description: please enter two of the three items and set the unit, then click the calculation button to calculate the other item.The input must be a numeric value or a legal formula that supports scientific counting method input. For example, 3.14e-5.6 can be entered, which means 3.14 × 10-5.6. Click the right soft keyboard to enter a function → View Help
Storage and transportation calculator speed diameter flow calculation speed diameter flow calculation description: please enter two of the three and set the unit, then click the calculation button to calculate the other speed (V): m/s m/h diameter (D): mcmmm flow (Q): m3/sm3/h
![Calculation of axial temperature drop of hot oil pipe - mutual calculation of parameters [boutique]](https://cdn.youqichuyun.com/data/attachment/portal/201211/02/233457c0nwjfrzttwppp3v.gif.thumb.jpg)
