Not normally, it all depends on the service condition or application of the expansion joint.
Read MoreDo you normally recommend tie-rods for a single expansion joint?
November 8, 2020
Tag: faq
Not normally, it all depends on the service condition or application of the expansion joint.
No, expansion joints are good for thermal or operating movements only. They should not be used for any misalignments or to close any gap while installing.
Do you include or recommend adding construction tolerances to the calculated thermal movements the expansion joints are supposed to accommodate?
No, expansion joints are good for thermal or operating movements only. They should not be used for any misalignments or to close any gap while installing.
Read MoreNo, intermediate anchors are typically used to divide the pipeline into sections and therefore multiple expansion joints can be used to divide up the thermal expansion.
Do intermediate anchors have to be a full anchors on an expansion joint?
No, intermediate anchors are typically used to divide the pipeline into sections and therefore multiple expansion joints can be used to divide up the thermal expansion.
Read MoreSlip joints transfer pressure thrust & spring forces into system unlike pressure balanced units.
Does US Bellows, Inc. have any unique design for pressure thrust balancing an in-line slip joint for long stretch of large-bore pipes?
Slip joints transfer pressure thrust & spring forces into system unlike pressure balanced units.
Read MoreWe do not include the vibration calculations in the normal design calculations, however, if you provide the natural frequency of the vibration, we can consider it.
Does fatigue failure of an expansion joint include the natural vibration of the structure and the natural frequency of the piping system during operation?
We do not include the vibration calculations in the normal design calculations, however, if you provide the natural frequency of the vibration, we can consider it.
Read MoreThere will be reduction of the pressure capacity of the bellows.
Does air between multilayer expansion joints reduce the pressure rating from single thickness?
There will be reduction of the pressure capacity of the bellows.
Read MoreCompared to stainless steel, carbon steel has modulus of elasticity at a higher temperature
Can you explain how carbon steel does not have sufficient elasticity?
Compared to stainless steel, carbon steel has modulus of elasticity at a higher temperature
Read MoreWe can send technicians to the field for certain repairs, however, it depends on the extent of the repair.
Can expansion joints be repaired in the field?
We can send technicians to the field for certain repairs, however, it depends on the extent of the repair.
Read MoreYes, the gimbal hardware of a gimbal expansion joint can be designed to support the weight of adjacent piping.
Can double gimbal expansion joints be self-stable if applied horizontally?
Yes, the gimbal hardware of a gimbal expansion joint can be designed to support the weight of adjacent piping.
Read MoreYes we are able to perform finite element analysis for bellows design. Normal bellows design is based on EJMA equations.
Are you carrying out finite element analysis for designing the bellows?
Yes we are able to perform finite element analysis for bellows design. Normal bellows design is based on EJMA equations.
Read MoreWe do not make bellows out of titanium but every material has their fatigue cycle. Titanium has higher stress allow-ables at temperatures but it does not mean they have infinite cycle life.
Are there special considerations for bellows material that do not have a fatigue endurance limit such as titanium?
We do not make bellows out of titanium but every material has their fatigue cycle. Titanium has higher stress allow-ables at temperatures but it does not mean they have infinite cycle life.
Read MoreYes there are and US Bellows, Inc. can design and manufacture these.
Are there expansion joints for seismic joints?
Yes there are and US Bellows, Inc. can design and manufacture these.
Read MoreSome hinge types can be provided with hinge pin holes which are slotted to permit limited axial travel. These slotted hinge types will not resist pressure thrust forces, and anchoring must be provided.
Are hinged pipe expansion joints provided with pin holes?
Some hinge types can be provided with hinge pin holes which are slotted to permit limited axial travel. These slotted hinge types will not resist pressure thrust forces, and anchoring must be provided.
Read MoreExcessive flexibility increases material costs, increases pressure drops, increase vibration, and creates 2-phase flow occurrences.
Why is necessary to eliminate excessive flexibility?
October 2, 2015
Excessive flexibility increases material costs, increases pressure drops, increase vibration, and creates 2-phase flow occurrences.
Read MoreIncrease in the number of segments (nodes) reviewed though computer use and use of precise calculations.
How are failures due to inadequate flexibility now almost nonexistent?
September 30, 2015
Increase in the number of segments (nodes) reviewed though computer use and use of precise calculations.
Read MoreWelds, fittings, branch connections , and other piping components where the possibility of fatigue failure could occur.
What are individual Stress-Intensification Factors (SIF) applied for?
September 29, 2015
Welds, fittings, branch connections , and other piping components where the possibility of fatigue failure could occur.
Read MoreThe Stress-Intensification Factor is the ratio of the maximum stress intensity compared to the nominal stress.
What is the Stress-Intensification Factor?
September 28, 2015
The Stress-Intensification Factor is the ratio of the maximum stress intensity compared to the nominal stress.
Read MoreThe maximum shear stress theory states that failure of a piping component occurs when the maximum shear stress exceeds the shear stress at the yield point in a tensile test.
What does the Maximum Shear Stress Theory state?
September 18, 2015
The maximum shear stress theory states that failure of a piping component occurs when the maximum shear stress exceeds the shear stress at the yield point in a tensile test.
Read MoreThe Maximum Principle Stress Theory and Maximum Shear Stress Theory
Out of the Six Theories of Failure, which are the 2 that are the most widely used?
September 17, 2015
The Maximum Principle Stress Theory and Maximum Shear Stress Theory
Read MoreThis theory states that yielding in a piping component occurs when the magnitude of any of the three mutually perpendicular principal stresses exceeds the yield strength of the material.
What does the Maximum Principle Stress Theory state?
This theory states that yielding in a piping component occurs when the magnitude of any of the three mutually perpendicular principal stresses exceeds the yield strength of the material.
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