The resistance of the coil to a load changes during compression, which is why these devices are called “variables”. Constant Spring Hanger provides constant support force for pipes and equipment subjected to vertical movement due to thermal expansion at locations where maintaining a constant stress is critical. This constant resistance is achieved by having two moment arms pivoted about a common point. The load is suspended from one of these arms, and a spring is attached to the other. With an appropriate choice of moment arms and spring properties, a resisting force can be provided that is nearly independent of position.
Constant support hangers are principally used to support pipes and equipment subjected to vertical movement due to thermal expansion at locations where transfer of stress to other supports or equipment can be critical. The maximum recommended variation according to MSS standard from the operating load is 25% for variable spring hangers. If the variation exceeds 25%, a constant support hanger should be used. The constant resistance to a load is achieved by combining a spring coil with a cam which rotates about a main pivot point.
The cam is designed such that the distances from the main pivot changes to compensate for the variable resistance during compression of the coil. The MSS standard provides for a tolerance of 6% in the constant load through the travel range. Constant support hangers are designed per MSS, ANSI, and ASME standards. The sizing of constants primarily depends on the total travel and load. 33. How much should be the difference between the load which will be taken by Variable Spring Hanger during Cold and Hot condition of Pipe? Ans: It should be Maximum 25% of Load for which Spring is designed. 34. Differentiate between static load and dynamic load.
The Essay on Reactions Of Simply Supported Bems
A beam with a constant height and width is said to be prismatic. When a beam’s width or height (more common) varies, the member is said to be non-prismatic. Horizontal applications of beams are typically at resists the rotation. TYPES OF LOADS AND BEAMS Beams can be catalogued into types based on how they are loaded and how they are supported. Loads that are applied to a small section of the beam ...
Ans: A piping system may respond far differently to a dynamic load than it would to a static load of the same magnitude. Static loads are those which are applied slowly enough that the system has time to react and internally distribute the loads, thus remaining in equilibrium. In equilibrium, all forces and moments are resolved (i. e. , the sum of the forces and moments are zero), and the pipe does not move. With a dynamic load—a load which changes quickly with time—the piping system may not have time to internally distribute the loads, so forces and moments are not always resolved—resulting in unbalanced loads, and therefore pipe movement.
Since the sum of forces and moments are not necessarily equal to zero, the internally induced loads can be different—either higher or lower—than the applied loads.
Load of pipes filled with water( Largest of 1 case – During hydrotesting dead weight(wt/m X piperack spacing) of pipes + 2 –3 maximum size pipes filled with water nd 2 case – Actual commissioned condition except the gas lines ) + Proportionate wt of extra space required by client (normal 30%) + Load of 1 heavily loaded tier + Electrical cables + Instrument duct + Guide load for 50% of lines Guide Load = 0. 3X(Dead wt of pipes at including water) The maximum induced thermal loads on the Anchor at the battery limit shall be limited to F in kg
