Start with the building
The height of the tower and the number of floors, the height of each floor and the position of the podium are needed first. A riser in a 60 m building and one in a 250 m building are different problems.
The shaft and the riser route
We need the architectural drawings that show the gas shaft, its size, where it runs from the ground to the top, and any offsets. The route decides where loops, bends and supports can go.
The structure
Sway and seismic movement of the tower come from the structural designer. We need the sway values at each level and the seismic zone or design data used, so that the building movement can be added to the analysis.
The gas system
The number of flats on each floor, the expected load, the pipe sizes proposed, the supply pressure and the position of the riser isolation valve and any regulator are needed to size the pipe and check the pressure.
Conditions at the site
The installation temperature and the highest temperature the riser can reach in its shaft are needed. The guidelines use 20 °C and 65 °C as the standard basis.
What you get back
A stress analysis report with the loads, the load cases, the results against the allowable limits, the loop or bellows sizes and the support positions, in a form that can be shared with the gas company and the contractor.
Send what you have
The data does not need to be complete. Send what is available and we will list what is missing.
To start, send us the drawings and building details. See our PNG riser stress analysis service.