NACE SP0193-2016 PDF

Full title and description

St NACE SP0193-2016 — Application of Cathodic Protection to Control External Corrosion of Carbon Steel On-Grade Storage Tank Bottoms. This practice provides guidance for the design and application of cathodic protection (CP) systems — both galvanic (sacrificial) anode and impressed-current systems — for carbon steel tank bottoms that are in contact with an electrolyte; it addresses new construction and upgrade/retrofit of existing tanks and is maintained by Task Group 013.

Abstract

This standard practice describes principles, design criteria, installation considerations, testing, commissioning and monitoring methods to control external corrosion of on-grade carbon-steel storage-tank bottoms using cathodic-protection technology. It covers site assessment, selection between galvanic and impressed-current systems, anode types and placement, electrical design considerations, isolation and stray-current issues, and acceptance/testing criteria to confirm adequate protection.

General information

• Status: Active / Current edition.
• Publication date: 2016 (published February 3, 2016 — 2016 edition).
• Publisher: NACE International (National Association of Corrosion Engineers).
• ICS / categories: Corrosion of metals; cathodic protection; pipelines, tanks and underground systems (ICS class 77.060 / corrosion of metals).
• Edition / version: 2016 edition (document number NACE SP0193).
• Number of pages: 32 pages (typical published PDF length).

Scope

The scope of NACE SP0193-2016 is limited to external corrosion control of carbon-steel storage-tank bottoms that sit on-grade and are in contact with an electrolyte (for example soil, moisture films, or retained liquids). It provides recommended practice for applying cathodic protection (both galvanic-anode and impressed-current approaches), including design criteria for new tanks and upgrades for existing tanks, installation and commissioning procedures, and verification and monitoring techniques to ensure long-term protection. It does not replace tank foundation or coating design guidance where separate standards apply.

Key topics and requirements

• Site assessment and pre-installation survey (soil/electrolyte characteristics, moisture, stray current sources).
• Design selection criteria: when to use galvanic anodes vs. impressed-current systems.
• Anode types, spacing and placement for on-grade tank bottoms.
• Electrical design: current output requirements, cathodic protection circuitry, rectifiers (for impressed-current systems).
• Isolation, bonding and mitigation of stray currents and interference.
• Coatings interaction with CP systems and recommendations for tie-in/repairs.
• Acceptance criteria, testing, commissioning, and periodic monitoring (reference cell measurements, holiday checks, and documentation).
• Guidance for retrofitting/upgrade of existing tank bottoms and consideration of construction and safety constraints.

Typical use and users

NACE SP0193-2016 is used by corrosion engineers, tank designers, asset integrity and maintenance personnel, inspection contractors, operators of bulk storage terminals and refineries, and consultants responsible for prevention of external corrosion of on-grade carbon-steel storage-tank bottoms. It is applied during design/specification of new tank installations, CP retrofits for aging tanks, acceptance testing, and ongoing monitoring and maintenance planning.

Related standards

Related documents include earlier/referenced versions of this practice (historical RP0193 editions from 1993 and 2001) and other NACE/AMPP standards on cathodic protection and tank systems (for example other NACE SP and RP documents covering underground tanks, coatings for tank bottoms, and corrosion under insulation). The historical lineage and related editions are documented in NACE product records.

Keywords

cathodic protection; CP; galvanic anode; impressed current; storage tank bottoms; on-grade tanks; external corrosion; carbon steel; tank retrofit; monitoring; cathodic protection design.

FAQ

Q: What is this standard?

A: NACE SP0193-2016 is a NACE International standard practice titled "Application of Cathodic Protection to Control External Corrosion of Carbon Steel On-Grade Storage Tank Bottoms" that provides recommended practices for applying cathodic protection to on-grade carbon-steel tank bottoms.

Q: What does it cover?

A: It covers site assessment, selection between galvanic and impressed-current CP systems, anode selection and placement, electrical/design considerations, commissioning and acceptance testing, and monitoring and maintenance for external corrosion control of tank bottoms in contact with an electrolyte.

Q: Who typically uses it?

A: Corrosion engineers, tank/terminal operators, asset integrity and maintenance teams, inspection contractors, consultants and designers involved in tank construction, rehabilitation and CP system implementation.

Q: Is it current or superseded?

A: The 2016 edition (SP0193-2016) is the published 2016 edition and is listed as the current/recent edition in distributor and standards catalogs; earlier RP0193 editions (1993, 2001) exist as historical versions. Users should confirm from the publisher if a newer revision has been released since 2016 before relying on the edition for procurement or compliance.

Q: Is it part of a series?

A: It is part of the suite of NACE/AMPP standards addressing corrosion control, cathodic protection and tank/underground system integrity; the document is maintained by a dedicated task group (TG‑013) and is related to other NACE SP/RP documents on tank bottoms, underground storage systems and CP practices.

Q: What are the key keywords?

A: Cathodic protection, galvanic anode, impressed current, on-grade tank bottoms, external corrosion, carbon steel, CP monitoring, tank retrofit.