36-Inch Integrity Assessment
Location: Virginia (US)
A major midstream gas company required a Stress Corrosion Cracking (SCC) integrity assessment in order to remain federally compliant. The project schedule was of critical importance due to the customer’s demand date for product transmission. This schedule demanded that BlueFin couple engineering subject matter experts and management resources to deliver a work plan that would meet the customer’s deadline.
Specifications
Diameter: 36 inches
Length: 20.63 miles
Wall Thickness: 0.375 inches
Maximum Allowable Operating Pressure (MAOP): 1,440 psi
Differential Elevation: 330 ft
Challenges
Limited accessibility
High potential for air lock
Strict environmental regulation
High economic impact for an extended outage
SIMOPS
Neighboring energized pipelines & facilities
Plan of Execution
Project Pre-Planning
Multiple site surveys.
Stakeholder planning meetings.
Creation of technical procedures.
Pipeline Filling
Design of uptake system to meet Department of Environmental Quality (DEQ) water removal permit.
Filtration of test medium prior to filling the pipeline.
Utilization of appropriate back pressure to ensure column integrity.
Hydrostatic Pressure Test
24 hour stabilization period.
Pre-planned, controlled pressurization and depressurization process.
Multiple data points to monitor pressure along each test section.
Pipeline Dewatering
Release of test medium into natural water body.
Utilization of carbon and particulate filtration to meet DEQ discharge permit.
Controlled release to maintain back pressure to prevent air lock.
Caliper tool run to identify internal pipeline geometric anomalies.
Pipeline Drying
Achieved dew point of -40°F and ¼ inch penetration.
Technical Achievements & Benefits
Multiple integrity tests with no ruptures.
Identification and location of a hard to detect leak.
Zero safety and environmental incidents.
Successful caliper tool run.
Successful integration with end user and general contractor management, consultants, and field personnel.
