pof_towers {CNAIM} R Documentation

## Current Probability of Failure for Towers

### Description

This function calculates the current annual probability of failure per kilometer EHV Switchgear The function is a cubic curve that is based on the first three terms of the Taylor series for an exponential function. For more information about the probability of failure function see section 6 on page 30 in CNAIM (2017).

### Usage

```pof_towers(
tower_asset_category = "33kV Tower",
foundation_type = "Foundation - Fully Encased Concrete",
paint_type = "Paint System - Paint",
placement = "Default",
number_of_operations = "Default",
altitude_m = "Default",
distance_from_coast_km = "Default",
corrosion_category_index = "Default",
age,
observed_condition_inputs_steelwork,
observed_condition_inputs_paint,
observed_condition_inputs_foundation,
reliability_factor = "Default"
)
```

### Arguments

 `tower_asset_category` String The type of Tower asset category `foundation_type` String Foundation type of the tower `paint_type` String Paint type of the tower `placement` String. Specify if the asset is located outdoor or indoor. `number_of_operations` Numeric Number of operations for the tower `altitude_m` Numeric. Specify the altitude location for the asset measured in meters from sea level.`altitude_m` is used to derive the altitude factor. See page 107, table 23 in CNAIM (2017). A setting of `"Default"` will set the altitude factor to 1 independent of `asset_type`. `distance_from_coast_km` Numeric. Specify the distance from the coast measured in kilometers. `distance_from_coast_km` is used to derive the distance from coast factor See page 106, table 22 in CNAIM (2017). A setting of `"Default"` will set the distance from coast factor to 1 independent of `asset_type`. `corrosion_category_index` Integer. Specify the corrosion index category, 1-5. `age` Numeric. The current age in years of the conductor. `observed_condition_inputs_steelwork` Named list observed_conditions_input `observed_condition_inputs_paint` Named list observed_conditions_input `observed_condition_inputs_foundation` Named list observed_conditions_input `conductor_samp = c("Low","Medium/Normal","High","Default")`. See page 146-147, table 192 and 194 in CNAIM (2017). `reliability_factor` Numeric. `reliability_factor` shall have a value between 0.6 and 1.5. A setting of `"Default"` sets the `reliability_factor` to 1. See section 6.14 on page 69 in CNAIM (2017).

### Value

Numeric. Current probability of failure per annum per kilometer.

### Source

DNO Common Network Asset Indices Methodology (CNAIM), Health & Criticality - Version 1.1, 2017: https://www.ofgem.gov.uk/system/files/docs/2017/05/dno_common_network_asset_indices_methodology_v1.1.pdf

### Examples

```# Current annual probability of failure for Towers
pof_towers(
tower_asset_category = "33kV Tower",
number_of_operations = "Default",
placement = "Default",
altitude_m = "Default",
distance_from_coast_km = "Default",
corrosion_category_index = "Default",
age = 10,
paint_type = "Paint System - Galvanising",
foundation_type = "Foundation - Earth Grillage",
observed_condition_inputs_steelwork =
list("tower_legs" = list("Condition Criteria: Observed Condition" = "Default"),
"tower_bracings" = list("Condition Criteria: Observed Condition" = "Default"),
"tower_crossarms" = list("Condition Criteria: Observed Condition" = "Default"),
"tower_peak" = list("Condition Criteria: Observed Condition" = "Default")),
observed_condition_inputs_paint =
list("paintwork_cond" = list("Condition Criteria: Observed Condition" = "Default")),
observed_condition_inputs_foundation =
list("foundation_cond" = list("Condition Criteria: Observed Condition" = "Default")),
reliability_factor = "Default")
```

[Package CNAIM version 1.0.1 Index]