CM 2112 - EXAM 1 - Piping T&F
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
Lead is a strong material at high temperature.
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 (e.g., 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
Stainless steel is resistant to rusting but not corrosion.
FALSE
Steels that contain 10% or more of alloying metals are called low-alloy steels.
FALSE
The strength of metals increases as temperature increases.
FALSE
Trepanning is not used to inspect the welding on new storage tanks or similar equipment.
FALSE
XS pipe means "extra small" pipe.
FALSE
"Brass" is a term used to describe a family of alloys of copper and zinc.
TRUE
A 3" schedule 40 pipe will have a different wall thickness than a 4" schedule 40 pipe.
TRUE
A paddle blind is inserted between two flanges, with a gasket on each side, while a figure-eight 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 than brass.
TRUE
As operating temperature increases above 650°F, the strength of low-carbon steel decreases, becoming significant between 950°F to 1000°F.
TRUE
Besides affecting strength, temperature has a profound effect on corrosion rates.
TRUE
Blocking in equipment unprotected by relief valves can exceed design conditions and cause failure.
TRUE
Brass and Bronze are from the family of copper alloys.
TRUE
Brass loses significant strength when heated.
TRUE
Brasses are widely used because of their resistance to corrosion from water containing various impurities that are corrosive to steel.
TRUE
Bronzes are from the family of copper alloys.
TRUE
Cathodic protection systems can protect equipment indefinitely as long as sacrificial anodes are replaced and current flow is open
TRUE
Cathodic protection systems can protect equipment indefinitely as long as sacrificial anodes are replaced and current flow is open.
TRUE
Flammable liquid containers can build up static charges as the 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
In addition to specifying pipe by schedule, pipe is also sometimes specified as STD, XS, or XXS, along with pipe size.
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 units is carbon steel, because it is fairly economical and has a wide temperature range.
TRUE
Nickel Alloys are used for processes that involve acids and caustics.
TRUE
O.D. = I.D + 2*wall thickness
TRUE
Piping fitting ratings of 150lb., 300lb., and 600lb. are common in chemical plants.
TRUE
Piping of the same size (e.g., all 4" pipe) has a constant outside diameter.
TRUE
Piping with threaded joints is generally much less expensive and easier to install than piping with 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 is used in sizes up to 2" for handling nonhazardous materials.
TRUE
Screwed piping joints are tapered to provide a tight fit.
TRUE
Small pipes are commonly joined by the use of tapered pipe threads.
TRUE
Socket-welded fittings are usually used in 2" size and smaller; butt-welding is used in all sizes, but particularly in 2" size and larger.
TRUE
Some low alloys (carbon-, moly-, and chrome alloys) are used in high temperature service such as furnace tubes.
TRUE
Stress corrosion cracking and a high coefficient of expansion are two conditions that case stainless steel to deteriorate.
TRUE
The chemical industry has two methods to prevent fire hazards from static electric sparks - bonding and grounding.
TRUE
The materials used in piping construction are chosen to withstand the temperature, pressure, and other properties of the fluids being conveyed
TRUE
The most common composition of stainless steel is referred to as 18-8, and has 18% chromium and 8% nickel
TRUE
The pipe wall thickness increases as the schedule number increases.
TRUE
The weakest part of screwed piping is usually the joints.
TRUE
To secure the strength and oxidation (rusting) resistance of low carbon steel at 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
Underground water pipes can function as a grounding device.
TRUE
Visual inspection is the most usual method for inspection.
TRUE
When stainless steel is heated, it expands at a rate approximately 150% of that of steel, which becomes a problem when stainless steel is used in close contact with other metals.
TRUE
