Chapter 3

Question 1

contain schematic for all piping, associated fixtures such as valves, various components of instrumentation such as pneumatic air lines & control mechanics such as control values.

Answer 1

Piping and Instrumentation Diagrams (PID)

Question 2

Meaning of ANSI

Answer 2

American National Standard Institute

Question 3

Meaning of API

Answer 3

American Petroleum Institute

Question 4

List the standard specification for pipe and fitting materials

Answer 4

ANSI B31

Question 5

__________ are based on the approx. diameter and are reported as nominal pipe sizes

Answer 5

Pipe sizes

Question 6

______________ are based on the actual outside diameter with a designated wall thickness. Wall thickness is normally expressed in BWG- (Birmingham Wire gauge)

Answer 6

Tubing specifications

Question 7

_______ are employed for piping connections when the pipe diameter is 0.075 m or larger.

Answer 7

Flanges

Question 8

Type of fittings:

___________ are employed for smaller sizes

Answer 8

Screwed fittings

Question 9

____________ resulting from thermal expansion or contraction

Answer 9

Pipe stresses

Question 10

__________ expansion or surge chambers may protect the valves

Answer 10

Hammer

Question 11

If cooling of the fluid in the system results in a vacuum - additional press difference experienced by the system

Answer 11

Ambient Effects

Question 12

_______ of the fluid insulation - steam tracing, sloping the line to drain the valves

Answer 12

Solidification

Question 13

Three Methods of Connecting Pipes:

Answer 13

1.screwed joints
2.welded joints
3.flanged joints

Question 14

Types of Screwed Fittings:

for connecting two pipe sections in alignment. It is a short sleeve internally threaded at each end

Answer 14

Coupling

Question 15

used as final connector in a closed line

Answer 15

Union

Question 16

for changing direction of pipeline

Answer 16

90 deg or 45deg elbows

Question 17

Type of Screwed Fittings:

for branch connections. When openings differ, there are reducing fittings.

Answer 17

Tee, Cross, Y

Question 18

for changing size in a straight pipeline

Answer 18

Bushing

Question 19

for closing the ends of pipelines

Answer 19

Plugs and caps

Question 20

short pieces of pipes with threading at both ends

Answer 20

7 Nipples

Question 21

devices for regulating fluid flow in pipe system

Answer 21

Valves

Question 22

used in opening or closing a compressed air line

Answer 22

PLUG COCK

Question 23

used in opening or closing liquid lines of large sizes

Answer 23

GATE VALVES

Question 24

has a globular body with horizontal internal partition with a circular passage that is opened or closed by a disc that engages the seat on the circular passage. Flow is straight.

Answer 24

Globe valve

Question 25

is a **globe valve with connection openings at 90 deg**

Answer 25

**Angle Valve**

Question 26

is similar to globe valve but uses **needles or cones** instead of discs

Answer 26

**Needle Valve**

Question 27

________ or pinch type valves are used as **flowrate control valve for corrosive substances**. Makes use of a soft rubber diaphragm that is pushed by the stem towards the lower hard rubber lining

Answer 27

**Diaphragm Valve**

Question 28

insures **one directional flow** and **guards against pressure fluctuations**

Answer 28

**Check Valve**

Question 29

check valve that **opens only at a specified pressure**

Answer 29

**Safety Valve**