Module 5 Flashcards
A rating of how much pressure a pipe, tube, or hose can withstand without bursting
Safe working pressure
a rating of how much pressure a pipe fitting can withstand without bursting
Bursting pressure
The most important factor in selecting a hydraulic line is the required _____.
Flow Rate
Hydraulic lines should be as _____ as possible.
Short
If a hydraulic line has high fluid velocity, will the flow be turbulent or laminar?
Turbulent
When selecting pipe for hydraulic lines, always make sure it will withstand the system _____.
Pressure
Pressure loss in a pipe is determined by the flow rate, the flow area and circumference of the line, and the fluid _____.
Viscosity
Should pipe used for hydraulic lines be galvanized?
No
A safety factor of _____ is used to determine the safe working pressure of a pipe in a hydraulic system.
6
One type of pipe thread recommended for hydraulic fittings is the NPTF, or _____ thread.
Dryseal
When may threaded fittings made of cast iron be used on hydraulic pressure lines?
Never
Hydraulic tubing is measured by its O.D. and its _____.
Wall Thickness
A bend in tubing should be smooth and have a(n) _____ cross section.
Round
The angle on the end of a flared tube is either _____ or _____ (degrees).
37; 45
Nuts and sleeves should be assembled on tubing _____ forming the flare.
Before
Name the three types of materials used for reinforcing hydraulic hoses.
Natural fiber (cotton), Synthetic fiber (nylon), Metal wire
Hydraulic hose-end fittings may be either the _____ or _____ types.
Permanent; Reusable
If one part of a quick connect/disconnedt coupling does not seal, it must not be installed on the _____ side of the line.
Pressurized
When selecting a hydraulic line, the most important factor to consider is the
a. direction of flow
b. fluid flow rate
c. fluid pressure
d. type of fluid
b. Fluid flow rate
Resistance to fluid flow in a hydraulic system is increased by
a. pipe restrictions
b. short lines
c. smooth pipes
d. the absence of bends or elbows
a. Pipe restrictions
Which of the following does not contribute to pressure loss in a hydraulic line?
a. direction of flow
b. fluid flow rate
c. fluid viscosity
d. pipe size
a. Direction of flow
Hydraulic lines should not be made from
a. black pipe
b. galvanized pipe
c. hose
d. tubing
b. Galvanized pipe
Steel piping may be used for hydraulic lines under all of the following conditions except
a. when large hydraulic lines store great quantities of fluid
b. when the fluid pressure is less than the safe working pressure of steel pipe
c. when the hydraulic lines are short and contain many bends
d. when the line is not expected to be taken apart
c. When the hydraulic lines are short and contain many bends.
When tubing is bent, which of the following does not apply to the bend?
a. It should be formed by hand
b. It should be free of flat spots
c. It should conform to the minimum allowable bend radius
d. It should have a round cross section
a. It should be formed by hand.
Which of the following is a proper procedure for installing hydraulic tubing?
a. Always use copper fittings
b. Cut the tubing off at a 45* angle
c. Flare the tube before assembling the flare nuts and sleeves
d. Support long tubing runs with clamps or hangers
d. Support long tubing runs with clamps or hangers.
A disadvantage of hoses in hydraulic lines is that they
a. absorb vibration
b. insulate against noise
c. provide temporary connections
d. wear from flexing
d. Wear from flexing.
Hydraulic hoses should not be used for temperatures above _____ *F.
a. 100
b. 200
c. 350
d. 450
d. 450
Most hydraulic hoses are rated with a safety factor of
a. 4
b. 6
c. 8
d. 10
a. 4
