AMPP CP4 Specialist case studies
AMPP CP4 Specialist · Put your knowledge to work in context.
The Cathodic Protection Specialist (CP4) Certification is the highest tier in the AMPP Cathodic Protection Program, a four-step pathway that begins with the Cathodic Protection Tester (CP1) and progresses through Technician (CP2) and Technologist (CP3). According to AMPP, the CP4 course focuses on the principles and procedures for CP design on a variety of structures for both galvanic and impressed current systems, and covers the theoretical concepts and considerations that influence the design and calculations, including attenuation, of a cathodic protection system. The AMPP CP4 Specialist case studies are 5 cases and about 2,654 words.
1Retrofit Galvanic Anodes on a Coated Buried Tank Bottom
A 24 m diameter flat-bottomed carbon steel storage tank sits on a sand pad with a perimeter seal. Soil resistivity averages 1,800 ohm-cm, but a 60 m band along the north side reads 6,000 ohm-cm and is seasonally dry.
641 words, about 3 min2Impressed Current Retrofit for a Coastal Sheet-Pile Bulkhead
A steel sheet-pile bulkhead 180 m long separates a brackish harbor (resistivity about 25 ohm-cm) from a sand backfill. The piles are uncoated below the mudline and coated above.
576 words, about 3 min3Attenuation on a Long Coated Pipeline with One Rectifier
A 12 km coated steel pipeline, 300 mm diameter, runs through soil averaging 4,000 ohm-cm. Coating conductance is estimated at 2.5e-6 S/m2.
484 words, about 2 min4Galvanic Anodes for an Offshore Jacket in Warm Seawater
A four-leg steel jacket in warm seawater (about 24 C, resistivity 20 ohm-cm) supports a platform. The submerged steel area is 3,200 m2, of which 2,900 m2 is bare and 300 m2 is coated.
491 words, about 2 min5Stray Current from a Nearby DC Transit Line on a Buried Pipeline
A coated steel pipeline runs parallel to a DC light-rail line for 2 km, about 30 m away. Pipe-to-soil potentials logged over 24 hours swing between -0.70 V and -1.35 V (CSE), with the most negative values during morning and evening service peaks.
462 words, about 2 min