Canadian Entry To Practice (CETP) Practice Test 2025 - Free CETP Practice Questions and Study Guide

The correct component of the DOT cylinder design codes is the combination of specification design code and service pressure. This aspect is crucial because the specification design code outlines the construction, material standards, and testing requirements for a cylinder, ensuring it meets safety regulations. The service pressure indicates the maximum pressure at which the cylinder is designed to operate safely.

Understanding these two elements is essential for the safe handling and transportation of gas cylinders. The specification design code is often found on the cylinder label and ensures compliance with legal safety standards, while the service pressure helps users know the limits to which the cylinder can be filled.

The other options do not represent valid components of the DOT cylinder design codes. For instance, while WC (water capacity) and associated codes may relate to practical usage, they do not encapsulate the main structural safety guidelines and operating limits defined by the DOT standards. Therefore, the combination of specification design code and service pressure accurately reflects essential components of the DOT cylinder design codes, aiding in the proper and safe use of these cylinders.