Expansion And Contraction Control

Question 0

What type of expansion loop is used in horizontal pipe racks where the loop must be raised to clear adjacent piping

Answer 0

Offset expansion loop

Question 1

What type of pipeline movement occurs where all motion is in a straight line along the longitudinal axis of the pipe

Answer 1

Axial movement

Question 2

What may be created between the packing at the end of the hub in a sleeve type expansion joint installed in the horizontal position

Answer 2

Water pocket

Question 3

What determines the number of corrugations required in a bellows type expansion joint

Answer 3

Amount of expansion to be absorbed

Question 4

Which expansion control device uses a combination of two hinged joints attached to a common ring in the centre of the joint

Answer 4

Gimbal expansion joint

Question 5

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

Answer 5

Structural engineer

Question 6

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

Answer 6

Thrust pad

Question 7

What will occur as the ends of the pipe begin to push against the anchor points

Answer 7

The line will try to deflect

Question 8

What force besides pressure thrust imposes a load against the anchors

Answer 8

Friction between the pipe and the support system

Question 9

Why would you install rollers under the pipe or pipe shoes

Answer 9

To reduce the friction load imposed on the anchors

Question 10

Which types of joints impose the least amount of thrust against the anchors

Answer 10

Ball,hinged and gimbal joint configurations

Question 11

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

Answer 11

17 5/8

Question 12

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

Answer 12

Angle iron clip guide

Question 13

What should be done to determine the required lengths of the legs in an unequal spread expansion loop..

Answer 13

Use the appropriate tables or slide charts

Question 14

What procedures are used to normalize the stress created during fabrication of an expansion loop

Answer 14

Post heat annealing or stress relieving

Question 15

Why would an inline expansion joint be used in preference to a piping offset or expansion loop

Answer 15

The offset or loop takes up to much room

Question 16

If a bellows expansion joint does not have control rods, where should the first set of guides be placed

Answer 16

Within 2’ of the bellows

Question 17

What needs to be determined before an expansion or contraction compensation device is installed in a system

Answer 17

Direction and the amount the pipe will move after installation

Question 18

What should be done before anchoring the lines when the ambient temp is radically differentthan the temp range specified for installation

Answer 18

Consult the piping engineer for the proper procedure to follow

Question 19

What has to be done if a sleeve type joint has been received fully compressed

Answer 19

Pull the joint open mechanically to the amount required

Question 20

What should be done before removing the shipping bars from a bellows type expansion joint

Answer 20

Anchor and hydro test the line at designed installation temps

Question 21

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

Answer 21

495mm

Question 22

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

Answer 22

73mm