Flashcards in Module 5 Deck (31):
The minimum pressure at which a component begins to split apart
Bursting pressure divided by system operation pressure
Air at normal atmospheric pressure (14.7 psi)
Piping fixture used to trap and eliminate water in the line
Measurement of a curve in tubing, from tubing centerline to the center of the circle
Name the three types of compressed-air conductors used in a pneumatic piping system.
Air should flow through a pipe in a(n) _____ pattern.
Streamlined or Laminar
The size of an air line should be selected so only a small _____ drop occurs.
Name at least four items that affect pressure drop.
Volume of air
Length of pipe
Number of fittings
Number of bends
To reduce the distance air travels in a large loop system, _____ air receivers are used.
Auxiliary or Extra
The lower the pressure in a pipe, the _____ the pressure losses will be.
Pressure losses through fittings and valves are given in terms of _____ of straight pipe.
Feet (or Lengths)
Name the three methods used for connecting pipe in a pneumatic system.
Compressor discharge lines should slope away from the compressor at a rate of ______ in. for every _____ ft.
NPT, when used for pneumatic systems, seals against air leaks with flank-to-flank contact and _____.
When connecting pipes, you must never apply piping compound to the _____.
More accurate inside and outside diameters are an advantage of _____.
Avoid using metallic tubing that has been bent and then _____.
When an air hose is connected to pneumatic piping, the hose should be one size _____ than the size of the connecting pipe thread.
Hose fittings may be classed as permanent and _____.
The type of hose coupling that uses a spring-loaded poppet to seal off the outlet when the hose is removed is called a(n) _____ coupling.
Turbulent airflow is likely to result from a(n) _____.
Large airflow velocity increase.
Which type of threaded fitting is probably the best suited to all but heavy-duty air-line applications?
150 lb malleable iron.
The pressure drop between the air receiver and the farthest point of air use should be no more than _____ % of the compressor cutout pressure.
The rate of downward slope for compressed-air piping used for compressor distribution lines should be _____.
1 in. per 10 ft.
Excessive pressure drops occurring in a loop system during peak flow may be avoided by the use of auxiliary _____.
Air receivers and compressors.
Long pipe runs should always be _____.
Supported with hangers.
How does a change in air pressure in a pipe affect the pressure losses?
Decreased pressure, higher losses.
Most nonmetallic tubing can be used for a maximum of _____.
100 psi and 190F
The pressure loss through fittings and valves is calculated in terms of _____.
Feet of straight pipe.