The OP is not giving more data readily.
In the meanwhile I have analysed the system considering both +ve static head and -ve static head (assisting the pump).
The assumptions in the following curves are as follows:
Pump rated point 10 m3/h, 7 mwc
Maximum piping friction drop 10 psi (approx 7...
Third one (in red) is correct. The net force in piping from EXJ is close to 0 as the forces in higher diameter annular area balances the hydrostatic force in smaller area which is connected to piping.
But as @LittleInch said, the fixing arrangements shown appears to be temporary
This is a detailed calculation. It would have been helpful if references for formulae were given.
However, assuming that the calculation is realistic, I recalculated the wall stress due to bolt shear as below:
The load per bolt increased about 7 times. But even then the stress is within yield...
Probably the pipeline has outlived its design life. If so, the remaining life with respect to corrosion etc. should be investigated and suitable replacements as required should be made.
How are you creating the low flow? Is it by throttling some downstream valve(s)? If so, at the upstream of those valves, high pump pressure at low flow will automatically exist. The shortfall in piping losses will be taken care of by valve throttling the flow and the system will remain on pump...
As per ASTM E8/8M 'Standard Test Methods for Tension Testing of Metallic Materials' the particular values obtained in the test are required, not the range.
It seems that the 'test certificate' received is actually manufacturer's standard specifications.
However, please check with latest codes.
@sleepdrifter
Sorry, I confused the direction of force. Refer below:
Now considering the statement by @MintJulep that the bolts have excess strength, I try to concentrate on the expansion force below. Note: it is difficult to predict (without FEA) the distribution of stress between pipe body...
Since there is a seal, is threading of blind flange in orange required? I assumed that there in no threading in the orange blind flange.It is not clear in the drawing.
You need to run thermal and sustained load cases with the neatest standard reducer thickness and get the end forces and moments of the reducer. You can then input the same forces and moments as boundary conditions in FEA analysis with required non-standard thickness of reducer. The end forces...
This may be a problem in tightening the bolts. Refer below:
The available pressure cone is very small resulting in low stiffness of the body.
The other stresses to be checked(in addition to @Stress_Eng ) are as follows:
1. The body tearing at the outside surface due to pressure forces
2. If...
For option 1, there should be an expansion joint at the pump discharge, as the thermal expansion for the atmospheric temperature range(about 50 deg C) may be close to 35 mm. It will be difficult to provide piping loops inside mines to absorb this amount of expansion, considering it is possibly a...
Yes, correct on principle. But as per practice in power plant indistry, for such high pressures, we usually have two valves in series, mainly as protection against valve passing.
I agree. But such a theoretical analysis will be time-consuming, and I would prefer ANSYS or similar software to simulate the transients.
However, I believe that the above formula will give the order of magnitude of F.
For such a large pressure drop, a small orifice size may be required. Hence, it will be better to have a series of orifices to reduce the pressure drop per orifice.
The small orifice size will tend to be blocked by dirt, so the valve should be placed upstream of the orifice to enable cleaning...
The explanation is as follows:
Suppose P is applied in +ve x direction.
1. There will be tensile force along asymmetrical member(end co-ordinate(-.707,-0.707)) as this will try to extend.
2. This tensile force will have a vertical component, which will be neutralized by tensile and compressive...
I also ran my software for asymmetrically arranged truss. The result is given below: One can see that both the above postulates do not hold good for this case.
