The so-called 'Kellogg equation' originated in the 1955 Edition of 'Kellogg design of Piping Systems and has little or nothing to do with The Kellogg Company or KBR of today. It is a simple one line equation that supposes to represent a complex stress field which has been misinterpreted and...
Judging by the flow direction and text (max 15 bar) it's a pressure regulator that dumps excess pressure to atmosphere ?
Does it connect to some sort of actuator cylinder ?
McDermott711,
API 617 is relevant to centrifugal compressor installations generally. The best source of information and analysis methods for vibration (vis-à-vis Piping) that I am aware of is the from the UK Energy Institute:
"Guidelines for the Avoidance of Vibration Induced Fatigue in...
There are usually no frequency issues associated with piping attached to a centrifugal compressor. Both pole passing (if electrically driven) and blade passing frequencies would normally be far too high to excite piping. The first support should be from structure and is normally a spring...
IF you have several roughly equal lengths between line-stops or "anchor bays" beware that a stress calc may show nearly zero axial load due to equal and opposite loads from either side of the restraint. Whilst that is the theoretical 'normal' case, massive differential axial loads can be...
We are designing a major North Sea field development ... not an area known for seismic activity .... for a 1 in 10,000 year probability seismic event. It takes no time to add it to a Caesar II type analysis as a static equivalent load.
Quoting Dozer ... If the owner absolutely cannot be...
The usual interpretation of 'L' in Piping terms is the maximum length between buckle arresting components, such as a flange, a stiffening ring or a support with a circumferential attachment. Personally I would not rely upon an elbow in this respect.
You could start with:
Design Pressure
Design Temperature
Material
Fluid description, viscosity, density etc.
Flow rate
Max allowed back pressure
Flange or otherwise end connection details
Any support arrangements required.
That should get you going.
I think you have pretty much got there already. Pipe support spans are usually governed by limitation of bending stress, mid-span deflection and local stress at supports. Local stresses are usually calculated via Roark's formulas. I don't see any difference between a cylinder and a pipe in this...
I suspect that you will find many similarities between PD 5500 and the TF code recommended by SnTman.
I don't think there has been any change to the method in PD 5500 for many years, so a new purchase may not be necessary.
Brits to the rescue !
Correct, ASME VIII only deals with metal to metal contact outside the bolt circle.
Check out PD 5500 (2012 or later) section 3.8.4 and working form 13.
ASME VIII Div 2 is a newer version. The old one was same as Div 1.
Since both are approved Codes, you should be able to use either, thus use Div 2 to consider external loads.
Why would you need to calculate API flanges when allowable loads are all quoted in 6AF2 ? The values in 6AF2 are all...
