1 ) CNodeThe CNode, or connecting node number, is used only when the other end of the hanger is to be connected to another point in the system, such as another pipe node.2) Additional design options are invoked by further use of the following checkboxes.

Extended Range Cold Load Design Hot load centered (if possible)

This tells CAESAR II how much room, above or below the pipe, there is to install the hanger

3) Hanger/Can Available Space

If the Available Space is positive, then the vertical clearance will be assumed to be above the pipe and a hanger will be designed. If the Available Space is negative, then the vertical clearance will be assumed to be below the pipe and a can will be designed.

4)The Allowable Load Variation :- It is the percentage variation from the hot load:

Variation- (Cold Load-Hot Load) / Hot Load

HANGER DESIGN Input Methods

•This is a parameter used to determine if there is sufficient travel to design a spring.

•The Rigid Support Displacement Criteria is a cost saving feature that replaces springs that are not needed with rigid rods.

•The hanger design algorithm operates by first running a restrained weight case. From this case the load to be supported by the hanger in the operating condition is determined.

•Once the hanger design load is known, an operating case is run with the hot hanger load installed to determine the travel at the hanger location.

•If this determined hanger travel is less than the Rigid Support Displacement Criteria then a rigid Y support is selected for the location instead of a spring.•If the Rigid Support Displacement is left blank or zero, the criteria will not be applied.•The Rigid Support Displacement Criteria may be specified on the Hanger Run Control Spreadsheet, or on each individual hanger spreadsheet. The value specified on the Hanger Run Control Spreadsheet is used as the default for all hangers not having it defined explicitly.

•A typical value to be used is 0.1 in.

5)Rigid Support Displacement Criteria

•NOTE:-Hangers should probably never be replaced by rigid rods in very stiff parts of the piping system that are usually associated with rotating equipment or vessel nozzles that need to be protected.

6)Allow Short Range Springs

CAESAR-II gives the user the option of excluding short range springs from consideration from the selection algorithms. In some instances short range springs are considered specialty items and are not used unless their shorter length is required for clearance reasons. In this case, this check box should be cleared by the user.

7) Free Anchor/Restraint at Node•Anchors, or restraints, simulating equipment connections that are in the immediate vicinity of the hanger are usually freed during the hanger design restrained weight run, so that loads normally going to the equipment nozzle are carried by the hanger.

•The user should enter the node number for the equipment where the restraint to be freed acts. The corresponding "free code" may also be specified to tell CAESAR II which of the restraint/anchor directions to be freed. For nozzles that are further removed from the hanger usually only the Y direction should be freed.

•Hangers are commonly used around equipment nozzles to support the weight of the pipe as it thermally expands away from the nozzle. The hanger can usually be designed to take almost the full weight of the pipe between the anchor and the hanger if the anchor is freed when making the restrained weight calculation.

•The anchor is "freed" by entering its node number in the Free Anchor/Restraint at Node field. The pipe going to the anchor will be treated just like a free end (for the hanger weight calculation only!!!).

•The Free Code field works with the Free Anchor/Restraint at Node field to limit the actual degrees of freedom at an anchor that are released.