Expansion And Contraction Control Flashcards
What type of expansion loop is used in horizontal pipe racks where the loop must be raised to clear adjacent piping
Offset expansion loop
What type of pipeline movement occurs where all motion is in a straight line along the longitudinal axis of the pipe
Axial movement
What may be created between the packing at the end of the hub in a sleeve type expansion joint installed in the horizontal position
Water pocket
What determines the number of corrugations required in a bellows type expansion joint
Amount of expansion to be absorbed
Which expansion control device uses a combination of two hinged joints attached to a common ring in the centre of the joint
Gimbal expansion joint
Who’s job is it to ensure that the anchor points required for the piping are strong enough to withstand the forces acting against them
Structural engineer
What may need to be fused onto a thin wall pipe to provide a strong enough support for an anchor on the run of the pipe
Thrust pad
What will occur as the ends of the pipe begin to push against the anchor points
The line will try to deflect
What force besides pressure thrust imposes a load against the anchors
Friction between the pipe and the support system
Why would you install rollers under the pipe or pipe shoes
To reduce the friction load imposed on the anchors
Which types of joints impose the least amount of thrust against the anchors
Ball,hinged and gimbal joint configurations
What amount of expansion would need to be allowed for in a 10” high pressure carbon steel steam line operating at 100 psi when the length of line is 750’ when installed at a temp of 45*f
17 5/8
What type of guide is designed to act as an anchor against side thrust as well as to maintain the axial alignment of the pipe
Angle iron clip guide
What should be done to determine the required lengths of the legs in an unequal spread expansion loop..
Use the appropriate tables or slide charts
What procedures are used to normalize the stress created during fabrication of an expansion loop
Post heat annealing or stress relieving
Why would an inline expansion joint be used in preference to a piping offset or expansion loop
The offset or loop takes up to much room
If a bellows expansion joint does not have control rods, where should the first set of guides be placed
Within 2’ of the bellows
What needs to be determined before an expansion or contraction compensation device is installed in a system
Direction and the amount the pipe will move after installation
What should be done before anchoring the lines when the ambient temp is radically differentthan the temp range specified for installation
Consult the piping engineer for the proper procedure to follow
What has to be done if a sleeve type joint has been received fully compressed
Pull the joint open mechanically to the amount required
What should be done before removing the shipping bars from a bellows type expansion joint
Anchor and hydro test the line at designed installation temps
What is the change in length of a 456m long low pressure condensate return line who’s coefficient of expansion is 0.0000162/c when the delta T is 67c
495mm
You are installing a 65mm copper chilled glycol line that is 125 m long when the ambient temp is 20c. What is the expansion or contraction you must allow for when operating at the design temp of -14c
73mm
