CM 2103 Practice Quiz
Lead is a strong material @ high temperature
FALSE
Stainless steel is resistant to rusting but not corrosion
FALSE
Trepanning is not used to inspect the welding on new storage tanks or similar equipment
FALSE
Bronzes are from the family of copper alloys
TRUE
The chemical industry has two methods to prevent fire hazards from static electric sparks: bonding and grounding
TRUE
pipe is also sometimes specified as STD, XS, XXS
True
XS pipe is extra small
false
a double block and bleed system is considered a complete shutoff
false
a socket weld is made by joining the ends of two pipes together
false
brass is stronger than steel
false
bronze alloys contain 90% or more aluminum
false
butt-welding is not often used in industrial construction
false
corrosion is not a major issue for process plants
false
in a butt-weld, one pipe is inserted into a larger fitting and welded
false
low carbon steel is not a very satisfactory material for most plant applications due to its high price
false
nominal pipe sizes are usually the same as their actual inside or outside diameters
false
nonferrous alloys contain large amounts of iron
false
piping of the same size (all 4" pipe) has a constant inside diameter
false
process equipment is designed exactly for normal operating pressure
false
schedule 10 pipe is considered heavy wall pipe
false
steels that contain 10% or more of alloys, metals called low alloy steels
false
strength of metals increases as temperature increases
false
O.D. = I.D. + 2 x wall thickness
true
Underground water pipes can function as a grounding device
true
a 3" schedule 40 pipe will have a different wall thickness than a 4" schedule 40
true
a paddle blind is inserted between 2 flanges, with a gasket on each side, while a figure-8 blind is designed to be installed inside the piping
true
a thread compound or teflon tape is used on screwed joints for lubrication and to aid in sealing the joint
true
aluminum and silicon bronzes are more resistant to salt water
true
as operating temperature increases above 650 degrees F, the strength of low carbon steel decreases, becoming significant between 950 deg F to 1000 deg F
true
besides effecting strength, temperature has a profound effect on corrosion rates
true
blocking is equipment unprotected by relief valve can exceed design conditions and cause failure
true
brass & bronze are from the family of copper alloys
true
brass is a term used to describe a family of alloys of copper and zinc
true
brass loses significant strength when heated
true
brasses are widely used b/c of their resistance to corrosion from water containing various impurities that are corrosive to steel
true
cathodic protection systems can protect equipment indefinitely as long as sacrificed anodes are replaced and current flow is open
true
flammable liquid containers can build up static charges as material is pumped in
true
flanges are made in various thicknesses and for various bolt sizes according to the pressure and temperature of the service
true
measuring wall thickness through drilled holes, called trepanning, is the most accurate method when transfer calipers cannot be used
true
most piping used in process unites is carbon steel, bc it is fairly economical and has a wide temperature range
true
nickel alloys used for processes that involved acids & caustics
true
pipe fitting ratings of 150lb, 300lb, 600lb are common in chem plants
true
piping of same size has a constant outside diameter
true
piping w/ threaded joints is generally much less expensive and easier than welded joints
true
raised face flanges use a gasket that fits inside the bolts and ring joint flanges use only a metal ring for gasketing
true
screwed piping joints are tapered to provide a tight fit
true
screwed piping used in sizes up to 2" for handling nonhazardous materals
true
small pipes are commonly joined by the use of tapered pipe threads
true
socket-welded fittings are usually used in 2" size & smaller; butt-welded piping is used in all, particularly 2" and larger
true
some low alloys (carbon, moly-,chrome) are used in high temperature such as furnace tubes
true
stress corrosion cracking and a high coefficient of expansion are two conditions that cause stainless steel to deteriorate
true
the material used in piping construction are chosen to withstand the temperature, pressure, and other properties of the fluids conveyed
true
the most common composition of stainless steel is referred to as 18-8, has 18% chromium and 8% nickel
true
the pipe wall thickness increases as schedule # increases
true
the weakest part of screwed piping is usually the joints
true
to secure the strength and oxidation resistance of low carbon steel @ high temperatures, small amounts of alloying elements are added
true
two methods of cathodic protection are using sacrificial anodes and using impressed current anodes
true
visual inspection is the most usual method of inspection
true
when stainless steel is heated, it expands at a rate 150% of that of steel, which becomes a problem whenever stainless steel is used in close contact with other metals
true
