In addition, a number of typical industrial constant spring hanger applications are shown on pages 4 and 5. Standard range constant supports are constructed to accommodate loads between 12 kg and 45700 kg with a standard range of travels from 40mm to 410mm in 10mm increments. Purchasing a spring hanger must serve the appropriate function of carrying the loads within its working range without failure. The rilco rcs81h type a is specially designed for mounting on a supporting member by means of attaching two rods into the tapped holes in the constant supportos top. The inherent characteristic of a variable spring is such that its supporting force varies with spring deflection and spring scale. Pendulum clamp, aluminum pole, large clamp, assorted masses, mass hanger, spiral spring, ruler, and 2 meter stick. Carpenter and paterson catalog 09ms multistrut channel framing systems. The cold load is calculated by adding for up movement or. To emphasize that x refers to the change in length of the spring we write f mg k. Constant spring supports and hangers rilco manufacturing. Our comprehensive services, includes the supply of a wide range of pipe hanging equipment. Care should always be taken to ensure that the selected unit. Identify the support close to the equipment nozzle that may be lifting up during the operating conditions and hence causing nozzle overload.
The constant spring unit is attached by either welding or bolting in accordance with the support detail drawings. If the variation exceeds 25%, a constant support hanger should be used. If constant designs other than those illustrated in this. Jun 06, 2011 in the case you want to use your existing spring support, recalibration is an option as long as the support is a constant spring support, in good operating condition, has an operating load range greater than fifteen thousand 15,000 pounds and the cost of field time and equipment is less than the cost of a new spring hanger. Variable spring hangers have a wide range of applications under three different standard. Us54583a disc spring constant compensating and hanging. Spring and constant hangers in the blocked position also count as rigid supports, where by for cold loads in hydrostatic tests short duration the emergency. Equalbalance constant spring hangers are available in seven different types and a broad variety of sizes to accommodate a wide range of loads, movements and hanger arrangements. To determine the spring constant of a spiral spring. In order to produce a constant supporting force the load moment about the main pivot must be counterbalanced by an equal spring moment throughout the travel range. This text is written as a guide to the business of pipe supports. A perfect constant support will exert the same lifting effort as the pipe moves either up or down. Constant hanger type 11 constant hanger type 18 constant support type 19 special bene. Buy best constant spring hanger with escrow buyer protection.
Figure ptp 100a is a vertical constant suspended from a beam. The final step will not be discussed to any great degree. A relatively stiff spring is engaged at one end to the recoil mass, which is in contact with the ancillary mass at the other end only over part of the recoil cycle. Each hanger has builtin upper and lower stops to limit hte travel a mininum of. Load adjustment in the field is discouraged as it may significantly change the system. The appropriate travel range in each case is marked by the 4th digit of the type designation according to the following tables. These components work on the basis of preset helical coil springs which exert a variable supporting load over the range of movement in accordance with their specified spring characteristics. A disc spring constant compensating and hanging apparatus comprises a fixed frame, two swinging frames, two spring units, a movable platen, a hanger plate and two displacement guide bars. Thus irrespective of travel the load remains constant over the complete range of movement. They are in fact a spring balance that, for an increase in load, yield a corresponding change in compressed length in direct relation to the spring stiffness. It can be furnished either with single rod suspension or double rod suspension as shown above.
Constant spring hanger design mechanism by salz engineering cosultants duration. Spring casing protects the coil from damage and weather. For spring hangers and supports product group 2 the springs are already installed. Hanger features enclosed construction in which a guided spring is. Modeling an already installed system coade, inc caesar. Please click on any of the following covers to view a pdf copy of our current catalogs. Ptp 100aconstant spring drawing shown for down travel. Technical and general requirements for spring hangers. Snubbers, rigid struts, viscoelastic dampers, energy absorbers, dynamic clamps. The objective of the experiment is to determine the spring constant of a spiral spring by hookes law and by its period of oscillatory mo tion in response to a weight. Constant load takes place through its range by a perfect counter balance crank lever where load and spring movements through the pivot ensure the minimum kinetic variation. Carpenter and paterson catalog 08c constant supports. Equalbalance engineered constant spring hangers spring hangers equalbanlance constant effort spring hangers are provided in the horizontal, vertical and up thrust canister types in range of sizes supporting loads from 19 pounds 8.
The rilco rcs80v type a is specially fabricated for mounting on a supporting member by means of attaching a rod into the tapped hole in the constant supports top cap bb. In all critical process and power plant units use of spring hangers is quite common. A spring constant is the measure of the stiffness of a spring. The pipe supports group a global solution a guide to the. Every constant spring hanger is calibrated in the factory and set to the load specified on the nameplate.
The variable position locking mechanism and load adjust facility is illustrated on sheet 10 fig 1. Redesign proposal for constant spring force pipe supports. These are mostly used near equipments to bring nozzle loads within vendor allowable values. The mechanism is used to dampen the recoil or kickback effects of a machine, such as a machine gun, jack hammer, or the like which generates short duration, highamplitude unidirectional forces. Jun 20, 2018 this video explains how to properly adjust a lisega constant spring load in the field. An equalalan e hanger is a reliable counterbalance with the counterbalance force imposed by a spring coil. Bergen pipe supports offers a complete range of pipe support solutions to fit any project. They are used when it is not possible to use rigid hangers most international standards advise a maximum load and constant effort spring supports would be variation of 25%, it is therefore recommended to select uneconomical a variable effort spring support on this basis. Carpenter and paterson catalog cf2009 construction fasteners.
Constant springs are used to support piping whose movements andor loading conditions cause too great a. Installation instruction constant support page 1 of 15 1. Constant spring hanger supports are use when this variation exceeds 25%. This refers to the actual load on the spring hanger during operating conditions. Keith escoe, in piping and pipelines assessment guide, 2006. Our constant supports hangers are manufactured mainly in horizontal and vertical models. Installation instructions for constant hangers and. Variable spring hangers are used for supporting piping and or vessels or equivalents, subjected to vertical movement or deflection and supporting load work in linearity. Installation instructions for anvil constant support hangers anvil eps. Remove the rigid support and add a spring hanger in that location.
However, to provide for situations where the supported load is different from the calculated load, the constant spring hangers are equipped with load. A spiral spring, a set of weights, a weight hanger, a balance, a stop watch, and a lab scale. Our constant support hangers are designed per mss, ansi, and asme standards. Carpenter and paterson catalog 09v variable spring supports. Constant effort spring hangers are available with in specified. Constant springs are used to support piping whose movements andor loading conditions cause too great a variability or too high of a loading condition for a variable spring.
The spring unit consists of front platen, rear platen, disc spring and spring rod with its one end extending outward through the center of the disc spring. Variable spring hangers are used to support piping subject to vertical movement where constant supports are not required. Anvil model r constant support hangers are made in two basic designs, 80 v vertical design and 81h horizontal design. To meet the industry set quality parameters, we are making making use if optimumgrade rawmaterial sourced from the famed vendors of the market. This constant resistance is achieved by having twomoment arms pivoted about a common point. Spring hangers and spring supports are used to balance slight vertical displacements in the pipe system. A spiral spring, a set of weights, a weight hanger, a balance, a stop watch, and a two. Torque balanced spring hangers work on the principle that torques exerted on lever arm components of the device due to a suspended pipe load are balanced with opposing moments provided by a spring force or similar acting on crank components.
It is not intended to be an authoritative technical manual and should be used only as an informative text. Carpenter and paterson catalog rh0608 residential hangers. Our latest catalog 17 combines our pipe support hardware, variable spring supports, constant effort supports, and dynamic and static restraints product lines into one easy to use catalog. The author was called out in the middle of the night when it was discovered that a constant spring hanger had bottomed out and become a rigid hanger on a hot superheated steam line. For minor vertical travel the variable load support is normally used, whereas the constant load support should be used for greater levels of thermal expansion. Spring supports spring supports are used for supporting piping and related components which are subject to thermal expansion.
Force balanced spring hangers are governed by the principle that the constant. The constant resistance to a load is achieved by combining a. To maintain the quality of spring hangers the hangers must meet several. The simplified construction, together with the established principle of a compression spring working in conjunction with a bell crank lever, achieves a mathematically perfect counter. Lisega constant supports how to adjust the load youtube. The use of spring hangers for supporting pipe weights are wellknown to every piping engineer. Technical and general requirements for spring hangers while. This counterbalancing of the load and spring moments about the main pivot is obtained by the use of carefully designed compression type load springs, lever, and spring tension rods. We give you the information on constant spring supports and what. Combined, the 80v and 81h constant supports are made in nine different frame sizes and 110 spring sizes to accommodate travels from 1 1. General science laboratory 1110l lab experiment 5 the spring.
A relatively stiff spring is engaged at one end to the recoil mass, which is in contact with the ancillary mass. Established in the year 2011, we, aaa supports pvt. Constant hangers and constant supports have a special design that allows for transforming the spring force into a constant force through a large vertical displacement range. To determine the spring constant of a spiral spring by hookes law and by its period of oscillatory motion in response to a weight.
A constant force spring mechanism is interposed between the ancillary mass and the base and is engaged at one end to the base and may be engaged to the ancillary mass at the other end. Our constant spring supports are coldpreset to the load specified by our clients in our factory. Steel construction spring, casing, and internal parts are. Spring hanger selection and design guidelines for a piping. Differece between variable and constant spring hangers. The exclusive geometric design of anvil model r constant support hanger assures perfectly constant support through the entire deflection of the pipe load. With the aid of our experienced team of professionals, we have come up with a wide range of constant spring hanger. Constant spring hangers are also used where load variation over 6% is not permitted, even if the vertical movement is not large. This refers to the spring rate, force per unit length in nmm, kgmm, etc. Unlike their more sophisticated relatives, constant spring hangers, variable spring hangers are devices that allow a degree of flexibility in the supported equipment. Variable spring supports pipe support, pipe hangers. Constant spring hangers are designed to support piping and equipment where large vertical movements are expected and where the load variability of a variable spring hanger would exceed 25% of the design load. The engineering contractor representative discovered that the existing spring that bottomed out was.
For example, cii selected a hanger with a spring constant of 1500 lbin with a travel around 0. Spring hangers are an integrated part of the piping industry. Modeling an already installed system coade, inc caesar ii. Over a specific travel range, constant hangers and supports carry constant forces max. Engineered pipe supports installation instructions anvil.
Find details of companies offering constant spring hanger at best price. The cold load is calculated by adding for up movement or subtracting for down movement the product of spring rate times. This refers to the load on the spring hanger when the system is in standby or nonoperating condition hot load. Equalalan e hangers provide constant support forces for piping systems which. Whenever some rigid supports are not taking load due to its thermal movement or rigid supports are creating bad effects on equipment connection piping engineers suggest the use of a spring hanger to share some. The rilco rcs80v type b is manufactured with one lug to accommodate attachment to building structure and allow for the use of various types of attachments. The mechanism includes an ancillary mass interposed between the base and the recoil mass. Load remains constant throughout its operating range. The geometric design of the constant support provides a mathematically constant amount of force exerted throughout the entire range of travel. Should it be impossible to select a hanger in a particular series such that both loads occur within the working range, consideration should be given to a variable spring hanger with a wider working range or a constant support hanger. Standard pipe supports, either singly or in combination with other standard or special supports, are arranged according to the. The constant load hangers in our programme incorporates the latest design concepts, resulting in a constant supporting effort through the total travel of the unit. All constant supports, spring hangers, sway braces and all engineered, bundled and tagged hanger assemblies are f.