Chapter 5 & 6

Turbulence, which causes abrasion within piping, can be caused by ____.

High velocity fluid flow

The most commonly recognized form of damage through the basic electrochemical corrosion cell occurs in the process of ______.

Oxidation

Many material manufacturers do not test for shear strength but estimate that it is approximately 60% of ultimate strength.

True

Material selection for piping systems is the responsibility of the design profesional.

True

A (n) ________ is an insulator which is placed between dissimilar or similar metals to help prevent an electrical circuit from being formed.

Dialectic fitting

Modern piping materials are grouped into three main categories: metallic, plastic, and metalloids.

False

One of the most common causes of high velocities in piping systems is over-sizing the piping system or pump for a given flow rate.

False

For ______ to occur in a cell, four elements must be present: two electrodes (anode and cathode), an electrolyte, and a return circuit.

Corrosion

Cast iron is an iron alloy made by smelting iron with amounts of carbon ranging from 1.8% to 4%, and silicon from 1% to 3%.

True

High-density polyethylene (HDPE) revolutionized the plastic industry because _______.

It was more heat-resistant than other plastics.

The general classes of cast iron are grey, nodular, white, and _______.

Malleable

All piping must be installed securely with hangers and braces so it is free to expand and contract.

True