# Presentation: 045241

## ICDA of Gas Transmission, Gathering & Storage Systems

- GOAL: Develop a protocol for Validation of dry gas ICDA method:
- Identify data needs
- Develop procedures for validation
- Develop evaluation criteria
- TASK:
- Identify sources of field data for validation
- Validate ICDA method for dry gas
- Demonstrate the method using an example

## Dry Gas ICDA Approach

*Utilizing a fluid flow model, the critical angle for water accumulation is determined as a function of gas velocity.** *

*The actual angle of inclination of pipe with **respect to gas flow direction is determined through digital elevation maps and pipe burial depths*

## Example 1

## ICDA Process

- corrosion

- No corrosion

- No corrosion

- 0

- -2

- -1

- 1

- 2

- 3

- -3

- -4

- Region

- First highest angle

- Gas flow

- corrosion

- corrosion

- corrosion

- corrosion

## Example 1 ICDA Score Card

- A historical IC leak was predicted by ICDA.

## ICDA Methodologyfor Wet Gas ICDA Goal

- GOAL: Develop a method for wet gas ICDA to:
- Identify locations most likely to have maximum internal corrosion
- Transmission, gathering & storage pipelines
- Focus on HCA rule
- Status:
- Consensus developed on overall methodology
- Detailed flow modeling using FLUENT indicates applicability of a critical angle
- Work ongoing to develop probability distributions for corrosion severity with distance
- Need ILI (or other integrity) data

## Improvements to ECDA Assessment Methodology by Incorporating Soils Data 

- GOAL: Obtain field data for soils to develop a soils model for existing external corrosion direct assessment (ECDA) datasets and methodology
- Identify corrosion/soils model protocol
- Task:
- Establish dataset of existing field inspection sites with indirect soils inspection data
- Collect soils-related data from on-going ECDA effort
- modify existing soils model, which was developed for stress-corrosion cracking assessments, for ECDA.
- Effort will be conducted concurrently with an ECDA demonstration project funded by GTI/PRCI.

**Notes:**
The OPS R&D Goals are to fill the technical Gaps and insure safe and reliable delivery of the nations energy needs.

## Improvements to ECDA Assessment Methodology by Incorporating Soils Data 

- Status:
- Completed collecting soils data from existing operator dataset
- On-going effort to collect soils-related data from parallel R&D effort with GTI/PRCI
- Soils model modification currently under development

**Notes:**
The OPS R&D Goals are to fill the technical Gaps and insure safe and reliable delivery of the nations energy needs.

## Develop high-amplitude guidedwave for long range pipeline inspection 

- GOAL: Develop a method for rapid screening in long lengths of pipe for corrosion & other defects
- Need high-power, guided-wave inspection technology in buried applications with bituman coating
- Target goal is an increase by 20 fold of amplitude
- Task:
- Investigate multiple sensor/strip pairs & sensor optimization
- Evaluate alternate strip materials
- Modify existing system and validate performance
- Conduct field demonstrations

**Notes:**
The OPS R&D Goals are to fill the technical Gaps and insure safe and reliable delivery of the nations energy needs.

**Notes:**
The OPS R&D Goals are to fill the technical Gaps and insure safe and reliable delivery of the nations energy needs.