assure a free-working joint. It is necessary to lubricate
every 6 months with the proper grease for this type of
joint and the service conditions. Once a year, you should
check the flange-to-flange distance of the slip joints.
You should check the flanges first when they are cold
and next when they are hot. Measuring makes sure that
the travel is within the limits shown in the manu-
facturers data. A change in slip travel usually indicates
a shift in anchorage of a pipe guide, so you must locate
and correct the difficulty. You should also inspect
annually for signs of erosion, corrosion, wear, deposits,
and binding. Then you should repair or replace the
defective parts, as required.
The bellows-type joint is checked annually for
misalignment, metal fatigue, corrosion, and erosion.
You should note the amount of travel between cold and
hot conditions. If the joint fails, you should replace the
bellows section of the joint.
Expansion loops require little specific maintenance
except inspection for alignment and leaks.
The ball joint must be kept adequately packed. You
should adjust or replace the gaskets, as required, to
correct leaks and obtain a free-working joint. You
should always refer to the manufacturers instructions
for doing maintenance work.
The swing joint requires only the normal
maintenance required for pipe fittings.
What are the two categories of radiators?
The bellows of an automatic air vent contains a
liquid with a boilingpoint of what temperature?
What are the two types of bucket steam traps?
What is the most common trouble with a
thermostatic steam trap?
The bimetallic strip in a bimetallic-element trap
is made of what materials?
Which steam trap test method uses a crayon?
What are the two general types of steam-
operated water heaters?
What device controls the quantity of steam
required for both types of water heaters?
What are the five major types of expansion
A bellows type expansion joint is inspected for
misalignment, metal fatigue, corrosion, and
erosion how often?