Fac - CAESAR II - Help

CAESAR II Users Guide

Language
English
Product
CAESAR II
Search by Category
Help
CAESAR II Version
13

Specifies the multiplication factor. The field changes according to the current piping code and is generally used for the transmission and non-US piping codes.

B31.1

Not used.

B31.3

Not used

B31.4, B31.4 Chapter XI

Not used.

B31.4 Chapter IX

Used only when you select Custom for Design Factor. Define a Hoop Stress Factor value in the range of 0.5 and 0.72.

B31.5

Not used.

B31.8

Not used.

B31.8 Chapter VIII

F1, Hoop stress design factor, according to Table A842.2.2-1 of B31.8. Appropriate values are 0.72 for pipelines or 0.50 for platform piping and risers.

B31.9

Not used.

ASME Sect III, Class 2 and 3

Not used.

B31.1 (1967)

Not used.

Navy 505

Not used

CAN Z662

Indicates whether the pipe is restrained, such as long or buried, or unrestrained.

The equation for pipe under complete axial restraint is:

Stress = (Fac) x abs[ Ea(T2-T1) + (1-n) Shoop ] + (SE + SL)(1-Fac)

Where:

E = elastic modulus
a = thermal expansion coefficient per degree
T2 = operating temperature
T1 = ambient temperature
n = Poisson's ratio
Shoop = hoop stress in the pipe.
SE = expansion stress due to bending
SL = sustained stress due to pressure.

Fac should be 1.0, 0.0, or 0.001. This value should be one for pipe under complete axial restraint. This value should be one when the pipe is fully restrained, such as buried for a long distance. The default value for Fac is 0.0. When Fac is 0.001, this indicates to CAESAR II that the pipe is buried but that the soil supports have been modeled. This causes the hoop stress component, rather than the longitudinal stress, to be added to the operating stresses if the axial stress is compressive.

BS806

Not used.

Swedish Power Code, Method 1

Sigma(tn) multiplier. This value is usually 1.5. This value should be 1.35 for prestressed (cold sprung) piping. The default value is 1.5.

Swedish Power Code, Method 2

Not used.

Stoomwezen

Constant whose value is either 0.44 or 0.5. For more information, see Stoomwezen Section 5.2.

RCC-M C, D

Not used.

CODETI

Not used.

Norwegian

Typical units (depending on your unit system):

  • lb/in2

  • KPa

  • N/mm²

Material ultimate tensile strength at room temperature, RM. If this value is not specified, this factor is not considered to control the expansion stress allowable.

FDBR

Overrides the elastic modulus ratio of EHn/EC (hot modulus/cold modulus) which is automatically determined by the software. Normally, you can leave this box blank.

The ratio is used to compute the expansion case allowable stress based on the material and temperature. However, you can type a value greater than zero and less than one to override the ratio calculated by the software.

To use FBDR, type the hot modulus EHn in Elastic Properties. The software determines the cold modulus EC and computes the elastic modulus ratio.

FBDR is the only piping code in CAESAR II which uses the hot modulus in the flexibility analysis.

If you type the thermal expansion coefficient into Temperature, then the software cannot determine EC. In this case, type a value of 1.0 in Fac and use F1, F2, ... F9 to specify the product of (f * EHn/EC) for each Temperature case.

BS 7159

Mean temperature change multiplier k as defined in Section 7.2.1 of the code. This should be 0.85 for liquids, 0.8 for gases, and 1.0 for ambient temperature changes. If left blank, this value defaults to 1.0.

UKOOA

Mean temperature change multiplier k as defined for the BS 7159. If left blank, this value defaults to 1.0.

IGE/TD/12

Material shakedown factor Ksd described in Table 4 of the IGE/TD/12 code. Typical values are 1.8 for carbon steel and 2.0 for austenitic steel.

HPGSL

Not used.

JPI

Not used.

DNV

Usage factor Nu (pressure bursting) from Tables C1or C2. Values must be between 0.64 and 0.84.

EN-13480

Not used.

GPTC/Z380

Construction design factor from Table 192.111.

PD-8010 Part 1

Same usage as CAN Z662.

PD-8010 Part 2

Not used.

ISO 14692

Fac is used in a different way. See the Reference for ISO 14692.