Compose wave/current loading

 

Function ready condition: Input data tables ENVLOAD and C-DML tested, moreover either table WAVE or table CURRENT tested. All other input data tables are optional.

 

Function error condition: 20 error conditions, 3 severe warning conditions, 11 warning conditions, 1 informational message condition, no messages

Errors:

E41-001:

Wave load reference "WaveRef" not found in table 'WAVE'.

The wave load reference name "WaveRef" provided in input table ENVLOAD, column WAVEREF has not been specified in input table WAVE.

no output data tables have been produced

E41-002:

Wave load reference found without table 'WAVE'.

In input table ENVLOAD a WAVEREF has been provided and input table WAVE does not exist.

no output data tables have been produced

E41-003:

Current load reference found without table 'CURRENT'.

In input table ENVLOAD a CURRENT has been provided and input table CURRENT does not exist.

if waves have been specified, output data table WAPROF has been produced

E41-004:

Profile not found in table 'CURPROF'.

In input table CURRENT a current profile referring to table CURPROF has been specified and the corresponding column in input table CURPROF is undefined.

if waves have been specified, output data table WAPROF has been produced

 

Warning If the CURRENT value in table ENVLOAD is Yes and the ORDER value in the CURRENT table is above 6, this error is also reported because there is just room for 6 profiles

E41-005:

Profile reference found without table 'CURPROF'.

In input table CURRENT a current profile referring to table CURPROF has been specified and input table CURPROF does not exist.

if waves have been specified, output data table WAPROF has been produced

E41-006:

Ground level above water level everywhere, or pipe is buried everywhere.

For each element one of the relations hold: W-LEVEL G-LEVEL or Z-AXIS G-LEVEL, or if the average water level does not exceed the average ground level.

no output data tables have been produced

(No parts of the pipeline are considered to be in open water though some may be above the local ground level but below the average one.)

E41-007:

Unable to calculate wave length according to Stokes 5-wave theory.

For shallow water and intermediate depth the wave-height/sea-depth ratio is too large (but less than 0.78) in case of Stokes 5 waves.

no output data tables have been produced

(In this case no solution is found for the equations describing the Stokes 5 wave theory. Apply another wave theory.)

E41-008:

Extreme wave-height/sea-depth ratio.

For shallow water and intermediate depth the wave-height/sea-depth ratio exceeds 0.78.

no output data tables have been produced

(The breaking wave limit has been exceeded and the available wave theories are not suitable to describe the situation.)

E41-009:

Extreme wave steepness.

The wave-height/wave-length ratio exceeds 1/7.

no output data tables have been produced

(The breaking wave limit has been exceeded. the wave is too high.)

E41-010:

Extreme diameter/wave-length ratio.

The diameter/wave-length ratio exceeds 0.1.

output data table WAPROF has been produced

(In this case the calculation method is not appropriate anymore because the influence of refraction and diffraction cannot be neglected.)

E41-011:

Distance to disturbing member too small.

The distance from an element (axis) perpendicular to a disturbing member (axis) is smaller than the sum of element radius and member radius.

output data table WAPROF has been produced

(The element diameter from table OUTDIAM is taken, if applicable, else the structural diameter from table PIPEDIM.)

E41-012:

Current profile not starting at (average) water level.

The Z-value in the first row of table CURPROF not equals the (average) W-LEVEL.

if waves have been specified, output data table WAPROF has been produced

(See description table CURPROF.)

E41-013:

Infinite amplification factor.

The wave frequency equals the natural frequency of a pipe span and no damping has been specified.

output data tables WAPROF and VELACC have been produced.

E41-014:

Deadweight of pipeline and weight of pipe in air not defined.

Input table DYNAMPL exists, but input table AIRWGHT does not exist, nor does column DEADW in output table PIPEDIM contain any data..

output data tables WAPROF and VELACC have been produced.

(For calculation of dynamic effects either the deadweight or AIRWGHT is needed.)

E41-015:

No ground and/or water level defined.

Either input data table G-LEVEL or W-LEVEL or both do not exist.

no output data tables have been produced

(Both G-LEVEL and W-LEVEL are needed in order to define the (average) water level and the (average) sea bed level.)

E41-016:

No elements in water.

The centre of each element lies above the (average) water level or, if not, to each element an ultimate top soil reaction (RVT) has been assigned.

if waves have been specified, output data table WAPROF has been produced

E41-017:

'C-DML' toggled to X-P not possible.

The coordinates of input table C-DML are toggled to X-P.

if waves have been specified, output data table WAPROF has been produced

(Use of X-P is not allowed due to possible overlap of data.)

E41-018:

Multiple definitions on element 'number' in table 'OUTDIAM'.

In table OUTDIAM an element is specified in 2 subsequent rows.

if waves have been specified, output data table WAPROF has been produced

E41-019:

Coinciding disturbing members.

A member falls (approximately) within the circumference of another member.

if waves have been specified, output data table WAPROF has been produced

(Coinciding disturbing members are not allowed.)

E41-020:

Element 'number' is "title".

In the WAFOR table, hydrodynamic forces have been defined for the indicated element. However, this element is either WEAK or a JOINT.

Severe warnings:

S41-002:

Gravity not between 9.3 and 10.3 m/s2

In input table PROPENV a unrealistic value has been specified for the acceleration of gravity.

all applicable output data tables have been produced

S41-012:

Wave profile is probably irregular.

For shallow water and intermediate depth the wave-height/sea-depth ratio is relatively large and Stokes 5 theory has been applied.

all applicable output data tables have been produced

(Although a solution has been found for the equations describing the Stokes 5 wave theory, the wave profile may contain bumps or even be triple-crested. You should check this by observing the graph of the wave profile in table WAPROF. The resulting velocities and accelerations may be less accurate or wrong.)

S41-013:

No hydrodyn. coef for el. 'el1' to 'el2'

Zero value hydrodynamic coefficients have been defined for submerged pipeline elements. This will result in zero valued hydrodynamic forces for the given elements. This is likely to be wrong.

Warnings:

W41-001:

With at least one element the ground level is above the water level.

For one or more but not all elements holds: W-LEVEL G-LEVEL.

all applicable output data tables have been produced

(This can be a normal situation, but also an input error.)

W41-003:

Irregular still water surface

The difference between W-LEVEL for an element in open water and the average W-LEVEL exceeds 20 % of the calculated average water depth.

all applicable output data tables have been produced

(Only elements in open water are considered for the calculation of both the average water and ground level. The average water depth is the difference between the average water and the average ground level. The values of these levels are reported in table VELACC.)

W41-004:

For row 'number' in table OUTDIAM no corresponding elements have been found.

The pipeline section specified in a row of input table OUTDIAM contains no element.

all applicable output data tables have been produced

(The table row in question has been ignored.)

W41-005:

Irregular ground surface

The difference between G-LEVEL for an element in open water and the average G-LEVEL exceeds 20 % of the calculated average water depth.

all applicable output data tables have been produced

(Only elements in open water are considered for the calculation of both the average water and ground level. The average water depth is the difference between the average water and the average ground level. The values of these levels are reported in table VELACC.)

W41-006:

Current profile not ending at ground level

The Z-value in the last row of table CURPROF does not equal the (average) G-LEVEL.

all applicable output data tables have been produced

(If the last Z-value is above G-LEVEL, the current is kept constant from last Z-value to G-LEVEL, if below G-LEVEL the Z-value at G-Level is determined by linear interpolation.)

W41-007:

No wave data, no dynamic effects calculated.

No wave reference has been specified in table ENVLOAD, but table DYNAMPL exists.

all applicable output data tables have been produced except table AMPLFAC

(Dynamic amplification is caused by the wave frequency.)

W41-008:

Dynamic amplification. factor < 1, changed to 1

The dynamic amplification factor for a free span is less than 1.

all applicable output data tables have been produced

(This may occur if the wave frequency is greater than the natural frequency of the pipe span.)

W41-009:

Soil defined at element(s) above ground level and below water level.

For one or more elements above ground and below water level soil properties have been specified in Design Function 3.2.

all applicable output data tables have been produced

(The elements in question have not been added to the list of elements for which wave/current forces are calculated.)

W41-010:

Table AIRWGHT is empty.

Input table DYNAMPL exists, but input table AIRWGHT does not exist.

all applicable output data tables have been produced

(The values from column DEADW in table PIPEDIM increased by the buoyancy have been taken as the weights in air.)

W41-011:

Element(s) in water below mean ground level

There are elements in water but below the calculated mean G-LEVEL.

all applicable output data tables have been produced

(For the calculation of wave/current forces these pipe elements are considered to be at mean G-LEVEL.)

Informational messages:

I41-001:

Diameter in row 'number' of table 'OUTDIAM' is smaller than structural diameter defined in DF3.1

For one or more elements of the pipeline section specified in a row of input table OUTDIAM the specified diameter is smaller than the structural diameter from input table DIAM.

all applicable output data tables have been produced

(It is more likely that the structural diameter should be increased due to possible coatings and marine growth, however reducing the diameter is allowed.)


H4104, last changed: 4/1/2021

See also:

Design function description

Input data table overview

Output data table overview