Cold Load and Hot Load Spring Design

This seems to repeat a previous thread. One of the answers to the other thread gives a hint, if your context is the same.

If this is steam piping, it will expand/contract with changes in temperature. Thus it is likely to have piping loops, roller hangers, and maybe spring hangers. These hangers may be under different stresses in different directions when the pipe is cold versus hot--hence "cold load" and "hot load."

As usual, Tornado is correct.

It seems that the original poster does not have the ability or inclination to use GOOGLE to learn the most fundamental of things.

• Free download the interested file for Pipe_Hanger_Design & Engineering - by ANVIL, and see the solved examples.

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• Also, see the following references and data by ANVIL:

- Anvil_-_Mechanical_Piping_Products
- Anvil_-_Metal_Framing_Products
- Anvil_-_Pipe_Fitter_Handbook
- Anvil_-_Pipe_Fitters_Handbook
- Anvil_-_Pipe_Fittings
- Anvil_-_Pipe_Hanger_Supports
- Anvil_-_Pipe_Hanger_Pictorial
- Anvil_-_Steel_Pipe_Nipples_Manual

Yea you can always call Anvil about this too. I just called them last week on a similar question (since I only work with spring hangers once every few years) and they helped me work it out.

In lay mans language :

When you install your piping system and its' resting totally on your spring support ( and maybe any other hard / permanent supports) , then your spring hanger load indicator should be at your COLD set value.

When the same system ( assemblage above) is made live by the intruduction of a process fluid ( energy source), then the load pointer should be at your HOT set point.

Hope this answers your question.

In addition to the info provided by others in this thread, you can check also

www.carpenterandpaterson.com

^{" a stupid question is the one that never gets asked"}

Cold load is the load on the hanger when steam pipe or other hot pipe is cold, the cold load is usually less than the hot load but can be greater when the line is cold because after the steam cools and condenses back to water it will be heavier in places where condensate is not evacuated properly and traps. we always set the support can to the cold load and then check it after the line warms up for steam, condensate, feedwater and other warm or hot piping after the line is warmed up then we adjust the settings to the hot load if it is off. I have seen when good engineering badly predicts the movement on steam lines and supports and I have argued till I was blue in the face and I was nearly always correct

There are many different types of spring cans, although most of the time people will use either a spring can designed to set pipe on or a can designed to hang pipe from. There are many specialty designed spring supports for all types of piping such as dampening water or steam hammering.

On vertical pipe runs with multiple heavy spring cans the designer can gradually load each double can hanger to take more of the weight as needed and get good results although it can be like Chinese arithmetic for the pipe fitter trying to figure out how to set and load the cans when they all look the same but are set for different loads. I have always tried to figure out the model that is close to what I need before I call Anvil and because they figure out the rest for me, it is very easy to order the correct spring can with kind of free help IMO