Section two Tube Data

Question 1

Pipe sizes up to 12 inches are designated by nominal sizes which are smaller than the outside diameter of the pipe: where as in most cases tube sizes are identical to what?

Answer 1

Identical to the outside diameter of the tube

Question 2

Tubing is classified into three major types what are they?

Answer 2

Structural tube, mechanical tube, and pressure tube.

Question 3

Structural tube is used in construction of such things as?

Answer 3

Building frameworks roadway median barrier’s bridge structures and other general structural applications.

Question 4

Maximum sizes for structural tubeing normally extend to what size and what wall thickness.

Answer 4

Up to 24 inches for round tubing with wall thickness up to 1 inch

Question 5

Mechanical tube is utilized in a variety of:

Answer 5

Mechanical and structural applications

Question 6

Mechanical tube has limited standards covered by ASTM or other agencies. Why is this?

Answer 6

Mechanical tubing is usually manufactured for a specific applications needing particular mechanical and chemical properties.

Question 7

Why is pressure tubing the type of tubing most often used in the pipe industry?

Answer 7

Is designed to carry fluids under pressure.

Question 8

Pressure tubing is available in several material classifications. Name seven of them.

Answer 8

• aluminum tubing
• Special application tubing
• Copper tubing
• Special Alloy tubing
• carbon steel tubing
• Plastic tubing
• Stainless steel tubing

Question 9

Aluminum tubing is available in both:

Answer 9

Welded and seamless forms in various alloys, tempers, and wall thicknesses.

Question 10

(Copper tube)
There are numerous types of copper and copper alloy tubing being manufactured however the greater part of copper tube used in piping industry is manufactured:

Answer 10

It’s manufactured with a minimum of 99.9% pure copper.

Question 11

Copper: This type of tubing designation is to be measured by its approximate what?

Answer 11

Inside diameter and is often referred to as plumbing tube.

Question 12

Plumbing to designation consist of tube types:

Answer 12

Type K, type L, type M, Pressure tube and DWV, a non-pressure type of tubing.

Question 13

(Copper) and other type of tubing which is designated by the outside diameter and wall thickness measurements. It comprises of ACR. What is ACR? what is GP?

Answer 13

Air conditioning and refrigeration. General purpose.

Question 14

STILL TUBING: Still tubing is designed for process refinery type heater applications for the tube is subject to what?

Answer 14

External furnace temperature is higher than the fluid or vapour is contained internally in the tube.

Question 15

Still tubing is usually supplied in what three types?

Answer 15

Seamless, hot finished or call drawn types for various ranges of temperature and pressure.

Question 16

General purpose tube: two classification under this heading is used for applications that require what?

Answer 16

General service types of tubing.

Question 17

For general purpose tube, standards ASTM a 179 and SAEJ524B Society of automotive engineers standards are usually two major carbon steel tube specifications under this classification the tubes are what?

Answer 17

Low-carbon and seamless tubes which are cold drawn and in the case of SAE tube are annealed for bending and flaring

Question 18

Special application tube: to being classified in this group is used for applications where?

Answer 18

Environmental conditions or installation requirements require a specific type of two or tube arrangement.

Question 19

Bundle metallic or plastic tube: these two bundles can also be classified as what?

Answer 19

Special application tubing.

Question 20

Bundle metallic or plastic tube is primarily used for what?

Answer 20

Pneumatic measurement and control signal instrumentation lines.

Question 21

Service conditions that require tube outside the scope of carbon steel or stainless steel specifications can usually be accommodated by what type of tube?

Answer 21

Special alloy tube.

Question 22

Why is plastic tube becoming more commonly used?

Answer 22

Because of that’s good corrosion resistance, ease of handling and low cost of manufacturing.

Question 23

What applications would plastic tube be used for?

Answer 23

Instrumentation air beverage and pharmaceutical lines.

Question 24

What are the more common types of plastic tubing used?

Answer 24

Nylon, polyethylene, polypropylene, Teflon and PVC.

Question 25

What is the working pressure for plastic tubing?

Answer 25

Range up to 600 psi what temperature maximums as high as 400°F.

Question 26

When bending tube a side effect is gain. The gain on a 90° bend is approximately equal to what?

Answer 26

Outside diameter of the tube being bent.