High Pressure manifolds strength analysis is the basis of High Pressure manifolds breakage prediction technology, we must first of all kinds of high-pressure fluid control components do basic strength calculation analysis.
When calculating intensity, high pressure fluid control components mainly exposed internal uniform pressure, pressure lowest 50MPa, up to 100MPa. When calculating the work load is divided into three levels, namely 50MPa, 70MPa and 100MPa. When calculating the tee, considering both domestic and imported, the parameters of these two materials come through experimental analysis as shown in Table 1.
Table 1 High Pressure manifolds material parameters

Table 2 Pup joint geometry (mm)

Table 3 Swivel joint geometry (mm)

The actual graphics pipe ends and tee shown in Figure 3, Figure 6.
Intensity 1. high pressure fluid control member Pup joint calculations
1) Pup joint finite element model
Pup joint is equal thickness hollow cylindrical steel components. Using the finite element method calculations on a computer, first Pup joint discretized into a finite element model. Due to the large thickness Pup joint must be three-dimensional solid elements. The internal pressure is applied to the load cell. Pup joint finite element model of a total of 2560 nodes, 1920 three-dimensional solid elements.

Figure 1 3 "Pup joint finite element space map
Static displacement 2) Pup joint of
Three types of the three load cases Pup joint static displacement, choose the maximum listed in Table 4.
Table 4 Pup joint maximum static displacement of

3) The static stress Pup joint
Three were calculated static load cases Pup joint stress, select The maximum stress and MisesThe maximum stress value.
Table 5 Pup joint static stress maximum of

Figure 2 3 "Pup joint Mises stress distribution (load 50MPa)
2. The high-pressure fluid control member intensity Swivel joint calculations
1) Swivel joint finite element calculation model
Swivel joint at both ends is used for connecting other high pressure fluid control components (such as Pup joint or tee) activities threaded architecture, such as the thickness of the middle part of the elbow. Swivel joint finite element model of the interception of the middle part of the elbow, because the middle portion with respect to the ends of easy to produce stress concentration, processing ends as constraints.
Swivel joint finite element model of a total of 2560 units, 3168 nodes. Still using three-dimensional solid elements.

Figure 3 3 "Swivel joint cross sectional view of the finite element space
Static displacement 2) Swivel joint of
Three types Swivel joint work of the three load wish under the maximum static displacement given in Table 6.
Table 6 Swivel joint maximum static displacement

Figure 4 3 '' Swivel joint Mises stress map （load 50MPa)

Figure 5 3 "Swivel joint stress profile chart
3) Swivel joint for static stress
Swivel joint in static stress maximum of three load cases and MisesThe maximum stress shown in Table 7.
Table 7 Swivel joint maximum static stress of

3.Intensity of the high-pressure fluid control components tee computing
1）Intensity of the high-pressure fluid control components tee computing

Finite element model of Figure 6 Tee pipe (US production)
Tee same diameter pipe inner diameter is different, using a three-dimensional solid elements, the final finite element model has 4996 units, 6180 nodes.
Static displacement 2) Tee pipe
Domestic and imported Tee pipe the three load cases of static displacement, select the maximum listed in Table 8.
Table 8 Tee maximum static displacement tube

3) static stress Tee pipe
Tee pipe in three kinds of static load cases MisesThe maximum stress and maximum stress are shown in Table 9.
Table 9 Tee maximum static stress tube

Figure 7 Tee pipe (US production) [Figure stress load 50MPa)

Figure 8 an enlarged view of the position of stress concentration
4.Intensity of the high-pressure fluid control components Gan end computing
1）End finite element model
Pipe ends finite element model shown in Figure 9, the node 2688, unit 2160. Using three-dimensional solid elements.

Figure 9 ends FEM map
2) static displacement tube ends
Table 10.
Table 10 maximum static displacement ends

Figure 10 ends The maximum stress value (the internal pressure of 50MPa)
Static stress 3) tube ends
Pipe ends in the static stress maximum of three load cases and MissThe maximum stress shown in Table 11.
Table static stress maximum 11 ends

5. High Pressure manifolds strength analysis conclusions
Intensity of high-pressure fluid control member is calculated on the Pentium-300 machine completed calculation software is widely used in the scientific community of ALGOR FEAS (Algor Finite Element Analysis System) finite element analysis system. Before this software, post-processing is complete, better visualization.
From the analysis of the calculation results can be obtained the following conclusions:
1. The high pressure fluid control member in the work load of 50MPa, 70MPa, when 100MPa, if the thickness t of the original thickness (thickness no wear and tear), have sufficient strength. Seen from the table, when the work load of 100MPa, the maximum displacement Pup joint is 5.980 × 10-2mm, appears in the 3 "Pup joint; the maximum displacement Swivel joint is 6.032 × 10-2 mm, appears in the 3" Swivel joint in; and maximum displacement Tee tube is 0.076mm, appeared in domestic Tee tube. Displacement values ​​above are able to meet normal operating requirements.
2. Analysis of the results from the High Pressure manifolds strength can be seen, the finite element method are in good agreement with the exact method. But the premise is to establish a mechanical model was appropriate. Such as 1.5 "Pup joint work load under the action of 100MPa, with the finite element method The maximum stress obtained for 257.009MPa, but with analytical method (ie exact method) The maximum stress obtained for 256.0MPa. Limited High Pressure manifolds element calculations and finite element numerical results correct model with high accuracy.
3. From the stress distribution of High Pressure manifolds visible, either Pup joint, Swivel joint, Tee pipe or tube ends, should the power level from the pipe wall to the outer wall of the tube decreases. Should force the highest level in the tube wall, because the work load directly on the tube wall.
4. Distribution of high stress areas. In Pup joint, the inner wall of the tube was undoubtedly the high gravitational zone: Swivel joint in high stress areas in the inner wall surface of the elbow; and Tee's in charge of the high stress areas and intersecting oblique tube armpit, Tee's armpit is stress focus area. This is entirely consistent with the conclusions of the qualitative analysis, also in line with the structure of the mechanical properties.
5. stresses exceed the standard. The results can be seen from the finite element method, the work load for the import Tee action under 100MPa, directors and oblique intersection pipe stress armpit up 759.633MPa, in fact, this is not true stress at armpit. That is the true stress Tee's reach so high. The reason of this magnitude is Tee stress caused by the finite element model, a finite element model of the formation of a sharp point in the armpit Tee cause stress concentration, but not the actual structure of the cusp.
6. pipeline design life of 10 to 15 years generally can be considered, in addition to the wall thickness of the manifold components should meet the strength requirements, but should also include corrosion, wear and tear, such as the manufacture of negative deviation left margin, the annual erosion rate the desirability 0 . 1rnrn. High Pressure manifolds for all members by attrition thickness 2mm calculate the stress and still meet the normal requirements.