Survey Services

Quality Close Interval Survey

Where practicable and determined by sound engineering practice, a detailed (close interval) potential survey should be conducted to: (a) assess the effectiveness of the cathodic protection system; (b) provide base line operating data; (c) locate areas of inadequate protection levels; (d) identify locations likely to be adversely affected by construction, stray currents, or other unusual environmental conditions; or, (3) select areas to be monitored periodically.
Section 10.1.1.3 of NACE RP 0169-92

Our Experience

RCDS's founder pioneered computerized Close Interval Survey in 1979. In 1982, he developed the first IR-free survey to collect "off" potentials at every location. Our employees have done over 30,000 miles since then. RCDS's Close Interval Survey is used in all fifty states as well as all over the world; from Saudi Arabia to New Zealand, from Mexico to Egypt.

We don't install groundbeds. We don't sell rectifiers. Our equipment, software and personnel are committed towards performing quality Close Interval Survey.

Proven Leading-Edge Technology

Our proven IR-free survey collects "on" and "off" readings every three feet along your pipeline. Using RCDS interrupters, we interrupt your rectifiers for 200 mS every second. Our lightning-fast DVM 3300 field computer collects thousands of voltages during each second, separating the "on" from the "off" reading, while discarding inductive and anodic spikes. The DVM 3300 even collects, stores and displays oscillographic waveprints, which confirm interrupter synchronization. If you like, the DVM 3300 can display Close Interval Survey graphs on its screen in the middle of your right-of-way!

Types of Close Interval Survey

	IR Free "on" and "off" at each and every point
	Criterion determine if any applicable criterion is met
	Interrupted standard "on" / "off" survey
	On standard "on" survey
	100 mV IR Free survey combined with a depolarized survey
	Cell-to-Cell hot spot survey
	Side Drain pipe-to-soil with lateral side drains
	Compliance distribution risers, mains, and services

RCDS performs all variations of Close Interval Survey:

Quality Close Interval Survey Analysis

Data analysis begins in the field. Your inspector is presented data within 24 hours of collection. Your data are electronically sent to Houston for preliminary review by our engineering staff. Plots, exception tables and statistical analyses are computer generated. These graphical and tabular data are carefully reviewed. Complete mile by mile evaluations and recommendations can be performed. Your final report includes a one page management summary, procedure descriptions, personnel resumes, plots and tabulations along with detailed recommendations. Your final report is always reviewed by a NACE certified Corrosion Specialist or Professional Engineer. Our services are available to explain and interpret our data for your management or your DOT auditors. Remember, we helped to train many of them.

Summary of Benefits

Quality. Quality technicians. Quality engineers. Quality equipment. We have the experience, technology and the know how to help you conform to changing and confusing regulations. With our technology, we have successfully guided many companies to meet compliance and economic requirements. Call us. We will succeed together.

Last Updated Friday, November 21 2003 @ 10:51 AM EST|550 Hits