Dynamic Load Factor for Water Hammer 1

[pengin83]

Does anyone know what a maximum Dynamic Load Factor (DLF) would be for a piping system affected by water hammer?

I've seen and/or heard from multiple engineering firms that they use a DLF of 1.5. From everything I've read, water hammer typically has a trapezoidal ramp function which could mean a maximum DLF of 2.0 (for single impacts).

Does anyone know where this 1.5 comes from? I'd love to have some literature to back up the use of a less conservative DLF.

I find it odd that more than 1 firm has made the same claim, so there may be some validity to it.

 

[BigInch]

In regard to what?
Loads applied to the piping system?
For estimating dynamic pressures in the piping system?
For estimating loads applied to supports?

 

[pengin83]

For estimating loads applied to the piping system by the water hammer. This would be used in the pipe stress analysis.

 

[BigInch]

So than what would you multiply by the load factor of 1.5?

 

[DSB123]

Dynamic load factor maximum is 2.0. For a pseudo static analysis use 2.0. You could always perform a hydraulic analysis then you could take the loads from it and do a dynamic load analysis of the piping without the DLF.

 

[JohnBreen]

Here are some"good reads"

http://www.accutech2000.com.au/AFT/...-Pipe-Dynamic-Loads-Caused-by-Waterhammer.pdf

https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2008-10/RP-D101.pdf

https://www.researchgate.net/public...ng_Systems_due_to_Steam_Hammer_Transient_Load

http://www.nacomm2005.ammindia.org/145 Occasional loads on pipes.pdf

https://books.google.com/books?id=Q...e&q=piping system Dynamic Load Factor&f=false