The limiting factors correspond to the limiting factors of the bellows design in accordance with the specifications of each expansion joint.
Read MoreWhat are the travel limits for the tie rods?
November 8, 2020
Tag: faq
The limiting factors correspond to the limiting factors of the bellows design in accordance with the specifications of each expansion joint.
The three basic movements within an expansion joint are axial, lateral, or angular rotation. All three of these movements do not generally occur at the same time.
What are the three basic movements within a joint?
The three basic movements within an expansion joint are axial, lateral, or angular rotation. All three of these movements do not generally occur at the same time.
Read MoreThe anchors are located at the lower floor and upper floor of chilled water risers and guides should be located on alternating floors. The expansion joints should then be located near the main anchors.
What are the guidelines on how to locate anchors and expansion joints in chilled water risers?
The anchors are located at the lower floor and upper floor of chilled water risers and guides should be located on alternating floors. The expansion joints should then be located near the main anchors.
Read MoreAn intermediate anchor is a stop in the piping system that divides the movement between expansion joints.
What are intermediate anchors used for in the expansion joint system?
An intermediate anchor is a stop in the piping system that divides the movement between expansion joints.
Read MoreConvolutions are the smallest flexible unit of a bellows. The total movement capacity of a bellows is proportional to the number of convolutions.
What are convolutions on bellows for expansion joints?
Convolutions are the smallest flexible unit of a bellows. The total movement capacity of a bellows is proportional to the number of convolutions.
Read MoreWe generally use universal primer for expansion joints, unless the customer specifies a specific paint.
What anti-corrosion coatings are used on expansion joints?
We generally use universal primer for expansion joints, unless the customer specifies a specific paint.
Read MoreYes, the limit rod will prevent damage of expansion joint in case of anchor failure in the line. Also, the rod will prevent damage to the expansion joint by distributing the movements evenly between the bellows
The axial load is transferred through expansion joint itself and the limit rod is for safety? Is my understanding is correct?
Yes, the limit rod will prevent damage of expansion joint in case of anchor failure in the line. Also, the rod will prevent damage to the expansion joint by distributing the movements evenly between the bellows
Read MoreWe do not put slots on our expansion joints, but we leave a minimum gap between the nuts and the lug depending on the lateral movement.
On a lateral tied expansion joint, is there space allowed in between the nut and the retainer to functionally avoid tilt of the tie-rod when at the operating temperature?
We do not put slots on our expansion joints, but we leave a minimum gap between the nuts and the lug depending on the lateral movement.
Read MoreUS Bellows, Inc. designs bellows for condition requirements.
Is there a pressure limit to start to use a wall thick EJ?
US Bellows, Inc. designs bellows for condition requirements.
Read MoreThe branch of a balanced Tee is in the flow path.
Is the branch of a balanced Tee in the normal process flow path? Or is it sealed off?
The branch of a balanced Tee is in the flow path.
Read MoreIt depends upon the diameter of the expansion joints. Generally for the smaller expansion joints, seamless is available.
Is seamless tube available instead of a butt welded tube for metallic expansion joints?
It depends upon the diameter of the expansion joints. Generally for the smaller expansion joints, seamless is available.
Read MoreIt depends upon the pipeline design. For example, if there is a long run of pipe on both sides, then we need guides on both sides. If the expansion joint is located close to an anchor, then guides are only required on the long side.
Is it okay to put guides on only one side of the expansion joint?
It depends upon the pipeline design. For example, if there is a long run of pipe on both sides, then we need guides on both sides. If the expansion joint is located close to an anchor, then guides are only required on the long side.
Read MoreYou should never punch a hole into an expansion joint.
Is it okay to punch a hole into an expansion joint?
You should never punch a hole into an expansion joint.
Read MoreYes, this expansion joint is obviously more expensive than the similar types, however they may result in a lower overall system cost when the elimination of main anchoring is considered.
Is an In-line pressure balanced pipe expansion joint more expensive than the similar type of expansion joints?
Yes, this expansion joint is obviously more expensive than the similar types, however they may result in a lower overall system cost when the elimination of main anchoring is considered.
Read MoreYes, it is safe to use 304 Stainless Steel, but high alloy materials such as Inconel® and Monel® are better options for a salt water atmosphere.
Is 304 Stainless safe for applications installed near the ocean where the metal may be more susceptible to corrosion or would you recommend another material?
Yes, it is safe to use 304 Stainless Steel, but high alloy materials such as Inconel® and Monel® are better options for a salt water atmosphere.
Read MoreExpansion joints should be pre-compressed for low-temperature/cryogenic applications because when the pipe gets cold it will contract.
In what situations would you pre-compress piping expansion joints?
Expansion joints should be pre-compressed for low-temperature/cryogenic applications because when the pipe gets cold it will contract.
Read MoreYes, if they are testing just the expansion joint or if they are testing when installed, they have to make sure that the pipe line is anchored or have limit rods added to the expansion joint to absorb the pressure thrust.
If a simple bellows is designed without limit rods (for operating cases), under a hydro test, do you recommend adding limit rods?
Yes, if they are testing just the expansion joint or if they are testing when installed, they have to make sure that the pipe line is anchored or have limit rods added to the expansion joint to absorb the pressure thrust.
Read MoreWe have standard lengths that are listed in our catalog, however, we can make our expansion joints longer or shorter than what our catalog states. We also can furnish piping assemblies with pipe and fitting as may be required.
How would I determine the equivalent length of an expansion joint within a piping system?
We have standard lengths that are listed in our catalog, however, we can make our expansion joints longer or shorter than what our catalog states. We also can furnish piping assemblies with pipe and fitting as may be required.
Read MoreBuckling typically occurs while the pipe in compression mode and is not normally related to the tension mode of the pipe.
How much tension is needed to prevent a pipe from buckling?
Buckling typically occurs while the pipe in compression mode and is not normally related to the tension mode of the pipe.
Read MoreThe expansion joint cycle is a design condition – stated by the customer or a number we provide according to the design of the expansion joint which refers to the expansion joint moving from the neutral position to compression and back to neutral.
How long is an expansion joint cycle?
The expansion joint cycle is a design condition – stated by the customer or a number we provide according to the design of the expansion joint which refers to the expansion joint moving from the neutral position to compression and back to neutral.
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