The slope of this line is the spring rate of this variable support. The required coil size is determined by load while the required number of coils length is determined by the. 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. The normal hydrostatic test load is twice the rated load of the support. Designed for use when spring adjustment must be below.
Variable spring supports are used to support the weight of pipe work or equipment while allowing a degree of movement relative to the supporting structure. B268, c268 spring hangers type a type a is the basic unit of fig. Each coil arrangement has a spring rate expressed in units of poundsinch or kilogramsmillimeters of compression. The hanger is locked and becomes a rigid support by restraining the spring compression plate as shown in the picture. A centering guide is provided to assure the permanent alignment of the spring assembly. The binder movement of the pipe when moving from the cold to hot. Variable spring supports welcome to pipe supports co. The use of spring hangers for supporting pipe weights are wellknown to every piping engineer. This type of spring support is also known as can type or f type spring.
Variable supports are manufac tured in five different travel series which allow up to ten inches of movement and twentyfive different sizes allow ing up to 50,000 pounds of load. Variable effort spring supports function on the principle of hookes law, which states that the force required to compress a spring is directly proportional to the compression of the spring. We offer a variety of different designs of variable spring pipe supports. The pipe supports group a global solution a guide to the. Variable spring supports introduction the variable support is a spring loaded device used for the support of piping and equipment where normal vertical movement is anticipated. Variable springs are used to support piping which is subject to thermal expansion and other factors that may cause the pipe support point to shift. When the installed load w is applied, the spring is compressed through the distance wk where k is the spring rate such that the reactive force exerted by the spring is also w under the equilibrium condition. Armeospring is an instrumented arm orthosis with a spring mechanism for adjustable arm weight support in a large 3d workspace that can be used as a realtime input device to the associated therapy software armeocontrol.
We compress the coil three inches during assembly using 600 poundforce. The weight the spring has to support while the pipe line system is in. Variable supports are manufactured in five different. When the supporting forces varies the springs absorbs the stresses in the pipe lines. The upper jam nut should then be locked, securing the hanger. Details of our programmers are given from next page. Variable spring supports pipe support, pipe hangers. Pipework andor vessels subject to temperature change or subsidence, etc. Pipe supports are to be installed according to the hanger assembly drawing at each support point. Our standard range of variable supports offers 5 travel ranges over 29 spring sizes enabling the engineer to optimise his selection of spring stiffness giving the. Export data and price of variable spring support under hs. At this stage the locking pin will still be fitted to the unit.
Variable spring supports variables use coiled springs to support a load and allow movement. Care should always be taken to ensure that the selected unit for small vertical movements up to about 75mm the has sufficient travel available to permit the free vertical variable effort spring support is recommended. A variable support is essentially a spring, or series of springs, in a container. Differece between variable and constant spring hangers. Variable spring supports e take pleasure in presenting to the piping industry the most versatile line of engineered hangers and supports. Designed for use where variable spring hanger is adjustment made from the top. Introduction since 1982 binder group binder is a specialist in the design and. There are two types of variable springs, one for suspending the lines from above or ceiling and one from below. Variable spring supports are used where pipelines are under high pressure, high temperature and results in vertical movement. View detailed export data, price, monthly trends, major exporting countries, major ports of variable spring support under hs code 8402. Variable spring hangers provide economical support for piping systems with vertical thermal expansion. Variable supports are manufactured in five different travel series which allow up to ten inches of movement and twentyfive different sizes allowing up to 50,000. Please click on any of the following covers to view a pdf copy of our current catalogs.
The cold load is calculated by adding for up movement or subtracting for down movement the product of spring rate times movement to or from the hot load. Axle assembly must be supported with hoist or other adjustable lifting mechanism. If a variable position locking mechanism vplm is fitted the nuts at the rear of the spring casing should be wound back to the end of the spring tension bars which pass through the channel. There are many different designs for variable supports and a particular nomenclature used to identify them.
The force of spring varies through the range of travel, hence the name variable supports. On no account should any attempt be made to remove the spring coil from the canister, since it has been precompressed. This product is typically used where variation between the operating and installed loads can be tolerated. Variable spring hangers and spring supports free download as pdf file. The variable support is a spring loaded device used for the support of piping and equipment where normal vertical movement is anticipated. To allow vertical movement, all the loads are taken care of by variable spring support in both the hot and cold position. Top of spring housing has double lugs to accommodate a singlelug attachment from the top support. Maintenance variable effort supports are designed to be maintenance free. Load indicator is clearly seen in the slot, simplifying. June 2017 1062017 uncontrolled when printed page 4 of 158 1. Basics of inspection and maintenance piping technology. Hanger type or bottom support type is selected based on pipe layout and the space availability for mounting.
Spring hangers are an integrated part of the piping industry. Variable spring hangers and spring supports pipe fluid. 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. Variable types a, b, c each of these is provided with an attachment that connects the top of the spring can to an overhead structural member. The original designer specified the size for the variable spring support at a certain point based on the load and travel of the pipe expected during startup, operation, and shutdown cycles of the system. There are many different designs for variable supports and. Each basic unit consists of two springs arranged in series within a single casing. Spring hangers and spring supports are used to balance slight vertical displacements in the pipe system. To purge spring of air, remove solenoid clip and rotate solenoid counterclockwise to first stop. Variable spring support design, size, selection, install. It is designed for attachment to its supporting member by screwing a rod into a tapped hole in the top cap of the hanger the full depth of the top cap g dimension. A variable load spring support is used for supporting pipework, vessels, columns and pipe connections to large tanks that are subject to thermal movement andor subsidence.
Spring supports spring supports are used for supporting piping and related components which are subject to thermal expansion. The locking device being constructed from two threaded members operates in an infinitely variable number of positions and is securely attached to the support for future reuse, regardless of pipework position. The variable produced can be further compressed an additional 3. Variable spring hangers are used to support piping subject to vertical movement where constant supports are not required.
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 multilock and balance indicator is a means of allowing the spring to be preset at any position throughout its travel range. The resistance of the coil to a load changes during compression, which is why these devices are called variables. We are the manufacturer of variable load effort, constant load effort spring hanger support and allied pipe suspension equipments. D positioned above supporting structure with spring d hangertype support. In addition to the physical integrity of the support assembly, the inspector must check the position amount of compression of the spring coil. Each assembly shall be installed in the location shown on the. Variable effort spring supports carpenter and paterson asia. Variable spring check list for requesting a quote or ordering. Variables use coiled springs to support a load and allow movement.
Pull solenoid out to second stop to bleed air from. The inherent characteristic of a variable spring is such that its supporting force varies with spring deflection and spring scale. The way a variable spring support responds to an applied load depends on the coil or coils inside the casing. In bottom support spring, the pipe is resting on the top of the spring load plate, as shown. 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. Installation instructions for anvil variable spring hangers anvil eps. Travelinmm dv 210 dv 140 dv 70 dv 35 0 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 21 22.
Carpenter and paterson catalog 09v variable spring supports. Variablespringsupports variablesupportselectiontable loadsinnewtons. Constant spring support is specifically used to accommodate constant effort load, excessive movement of the pipeline due to high. The functioning of these components is based on preset helical coil springs which exert a variable. In addition to the dv range of variable spring supports. Anvils spring hangers can be utilized in a variety of situations where adaptation is. For relatively small displacements up to about 75mm the variable spring support is recommended. Variables use coiled springs to support a load and. In this section, you will find our standard variable and constant pipe supports. B268 features and is designed to the same exacting specifications.
1285 106 245 1391 1052 1207 1425 100 118 367 81 1162 793 1303 1498 597 771 804 447 1324 38 713 87 960 1452 1162 1079 994 1354 1416 1220