Thus, a 2000-pound hanger can be adjusted for loads from 1800 to 2200 pounds. PTP 100 – F-Constant Spring Fig. • L – Maximum for the load range Spring coils are supplied plastic-coated as standard. Transfer the load by turning on the turnbuckle before removing the travel stop. Example 1           Load = 2,400 lb. PTP figure 100 type F (Layout-A) is a vertical constant designed to support piping from below using a Sway Strut. Total Travel = Actual Travel + Over Travel. Figure PTP 200-U is a horizontal constant designed to support piping from below. • WT – Maximum weight for the load range, Download PTP 200-F Constant Spring Support PDF. The hanger rod and loading arm of the constant should be unobstructed. • D – J-Rod position for down travel If this is the case, to clear the depth of the supporting steel, the rod take out (RTO) can be specified to exceed the minimum. Our constant support hangers are designed per MSS, ANSI, and ASME standards. The simplified construction, together with the compression spring working in conjunction with a bell crank lever, achieves a mathematically perfect counter-balancing of spring and load moments about the main pivot point. The constant resistance to a load is achieved by combining a spring coil with a cam which rotates about a main pivot point. Constant Spring Support - Find RFQ detail Constant Spring Hanger, Pipe Clamps from United Kingdom Constant springs are used to support piping whose movements and/or loading conditions cause too great a variability or too high of a loading condition for a variable spring. • TO – Take out for up travel LOAD ADJUSTMENT 2. Using the turnbuckles, adjust the load indicator to the cold position. 1400 Pipe Shoe Solution for Vibration in Piping, Case Study: Engineered Support for Vibration problem, Piping Alignment and Pipe Strain Solutions, Customization Addendum for Spring Supports, Spring Support Sizing & Pipe Stress Analysis, Engineered Spring Supports – General Information, Variable Spring Supports vs. Fig. As with variable springs, Type refers to the connection of the constant to the structure and the pipe. This range of bottom mounted constant spring supports offered by us is for high vertical travel in pipeline , ( say more than 50mm onwards) . Variable Supports are manufactured in five different Travel Series which allow up to ten inches of movement and twenty … Beyond the Pipe Stress analysis, we will need elevation, attachment type, and any space constraints. If pin cannot be easily removed after struts adjustment, do not drive pin out. J-rod swings at least 4° from vertical. It can be furnished either with single rod suspension or double rod suspension as shown above. Download  PTP 200-D Constant Spring Support PDF. • TO – Take out for up travel Loosen the travel stop nuts below the angles to allow the load flange to rise up to the installed height: 3/8″ max. Actual Travel = 7.10” Figure PTP 100-U is a vertical constant designed to support piping from below. The hanger load should now be readjusted to the cold (white mark) position. Then loosen the lock nut at the end of the spring. • D – J Rod position for down travel Using the turnbuckles, level the pair of channels connecting the two constants. • RTO – Rod take out for down travel • M – Maximum height for the load range Blue: over travel (MAX AVAILABLE) position. Step 1: Determine The Load: this is the load (installed/operating) of the equipment or piping (including tare / dead weight), which the constant is to support. Download PTP 100-E Constant Spring Support PDF, Layout -A Shown | For Layout-B, scroll down. of load and 4″ of movement in an 8″ x 10″ x 29″ envelope. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. Tighten the main nut, then retighten the lock nut. Engineered Spring Supports – General Information • D – J-Rod position for down travel 4. If the variation exceeds 25%, a constant support hanger should be used. Constant Spring Supports : The Constant load hanger uses the Bell Crank Lever & helical spring Mechanism to provide a constant supporting force over its entire travel range. ORDERING: Specify figure number, size, type, load, actual travel, total travel and direction of travel. 1. Given an actual travel of 7.10”, which is over 5”, the amount of over travel is 1.42”. There is no other constant spring hanger in the market that is truly optimized for space and weight considerations. The key to selecting a constant support style would be the space available for that support above, below and around the piping (see below). The constant resistance to a load is achieved by combining a spring coil with a cam which rotates about a main pivot point. Secure the hanger to a structure capable of handling the operating load, at a point where the constant’s load coupling is directly over the desired point of attachment to the pipe in the operating position. PTP 200 – C-Constant Spring Example 2          Load = 2,400 lb. • RTO – Rod take out for down travel • D – Load flange position for down travel Please call for dimensions on such special designs. Note that if the pipe line is not centered in the C-C dimension, then one constant in the assembly will carry a heavier load than the other. For load and travel not in the tables, please call for dimensions. Attach the connecting rod to the turnbuckle with full thread engagement. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. Thus, the total travel is 9” rounded to the upper 1/2”. From this table under the same column the lug information is provided. • CH – Size of channel, Download PTP 100-U Constant Spring Support PDF. According to MSS-SP-58, the maximum recommended variation from the operating load for variable spring hangers is 25 %. Screw Threads are ISO-metric coarse pitch series (6mm pitch series above size M64). 3. Covered spring provides protection and good appearance. Comparative Corrosion Resistance Guide, Installation & Maintenance Adjusting the load to a higher or lower load from the load specified on the nameplate using field load adjustment is approximate. 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. maximum recommended variation according to MSS standard from the operating load is 25% for variable spring hangers. Fig. Figure PTP 100-A is a vertical constant suspended from a beam. PT&P is almost always very cost-effective for Pipe Stress Analysis. The Constant Spring Supports is known for their longer shelf life. and 7″ of movement in a 0.89 Cubic Foot envelope. When the operating conditions are reached, check the hanger to assure the indicator is at the hot (red mark) position. 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. The MSS standard provides for a tolerance of 6% in the constant load through the travel range. Step 2: Determine Total Travel: the total travel is the vertical design travel plus the recommended over travel rounded up to the nearest ½ inch. For all constant spring supports there is no difference in load and the supported load will remain uniform throughout the deflection cycle. Constant Spring Support A constant spring is an assembly comprised by a spring and a primary cam mechanism. Figure PTP 100-G assembly consists of two inverted vertical constants attached with a channel as shown above. The load adjustment capability consists of a load adjustment scale which is used to increase (Figure A) or decrease (Figure C) the load up to 10%. For a given total travel on the top row of the constant load table, select the operating load on the high side under the column. on the high side (the other load of 2,277 lb. 3. • E – J-Rod position for up travel The load ranges in the tables below are half the total load lifted by the assembly, with the pipe line seated in the center of the C-C dimension, where each constant carries half the total load. Constant Spring Supports. 9. a) For actual travel less than 5 inches, the over travel is 1 inch. Hydro test line if necessary. The force is made constant by a counterbalancing spring assembly. Remove the travel stops. Actual Travel = 3.35” The sizing of a constant is independent and not related to its dimensions. From the Figure 200 Type-C list of tables (see Page 81), the J-Rod and Lug Selection table for a load of 2,356 lb. Fig. For these situations, PT&P has the following solutions: – Estimate the load based on the pipe and media specification and estimate movement from existing spring support Attach load rods to the structural support. Having the total travel and load, the constants are sized per the constant load table. • WT – Maximum weight for the load rang, Download PTP 100-C Constant Spring Support PDF. It can be furnished with single lug suspension or double lug suspension as shown above. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. • F – Maximum length for the load range PTP 200 – E-Constant Spring Under no circumstances should an attempt be made to remove the lock nut and the load adjustment nut from the constant spring hanger. English Sourcing Solutions Services & Membership Help & Community Ready to Ship Trade Shows Get … PTP 200 – U-Constant Spring, Travel 1-1/2″ – 7-1/2″ portalId: "88145", • E – J-Rod position for up travel Figure PTP 100-C is a vertical constant suspended from a beam. Constant Spring Hangers are also used where load variation over 6% is not permitted, even if the vertical movement is not large. Anchorage Constant Spring Supports are designed to allow the supported pipework to expand vertically upwards or downwards, whilst maintaining a constant supporting effort throughout the travel range. • E – J-Rod position for up travel *Drawing shown for up travel. IntroductionBergen Pipe Supports' constant spring hanger incorporates a design that generates a constant supporting force throughout its total travel range. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. Inspection and Maintenance of Supports Constant Springs Installation & Maintenance Guide. They should be easily removed. 5. Constant Spring Supports. This constant supports vertical movement subjected by the total travel and no axial or lateral movement from its load flange unless a slide plate is added. Methods of Protecting against Corrosion Few important points to keep in mind while Spring selection. Constant Spring hanger- Load remains constant throughout its operating range. • WT – Maximum weight for the load range. b) For actual travel of 5 inches and over, the over travel is 20% of the actual travel. Spring Support Sizing & Pipe Stress Analysis, Why PT&P Spring Supports Spring hangers and spring supports are used to balance slight vertical displacements in the pipe system. To decrease the cold setting be sure that the travel stoop pin is in place. • TO – Take out for up travel Considering All Movement in Pipe Support Design The rod take out (RTO) can be specified to exceed the maximum. Constant spring support is specially used to accommodate constant effort load, excessive movement of the pipeline due to high temperature and pressure of thermal movement. This constant supports vertical movement subjected by the total travel and no axial or lateral movement from its load flange unless a slide plate is added. Spring Supports sizing is determined by a Pipe Stress Model which assesses the thermal growth and associated stress on the piping, nozzles, etc. The geometric design of the constant support provides a mathematically constant amount of force exerted throughout the entire range of travel. View more details on how we can customize your constant spring support. It is important to understand that this constant has vertical movement subjected by the total travel and an axial movement (E – D) due to the angle of rotation. The cam is designed such that the distances from the main pivot changes to compensate for the variable resistance during compression of the coil. We can quote directly from the stress analysis. • WT – Maximum weight for the load range. These must be present during installation and any hydro testing, but must be removed before normal operations. Constant Spring Support Constants use a spring coil (or series of coils) to accommodate pipe movement from the initial (installed) condition to the final (operating) condition of the piping system. Example         Figure = 200       Type = C        Load = 2,356 lb. They are usually pins, but in some cases may be keys. formId: "387a2f0a-000b-4fec-ace9-674cd4cf472e" The base plate is bolted directly to the top of the steel or floor. © 2018 Piping Technology & Products, Inc. All Rights Reserved, ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED, “Rod Take Out (RTO) is for up travel [subtract 6 inches for down travel ], “Rod Take Out (RTO) is for up travel [subtract 8 inches for down travel ], “Take Out (TO) is for down travel [add 4 inches for up travel ], “Take Out (TO) is for down travel [add 6 inches for up travel ], “Take Out (TO) is for down travel [add 8 inches for up travel ], “Take Out (TO) is for down travel [add 10 inches for up travel ], “Take Out (TO) is for down travel [add 12 inches for up travel ], “Take Out (TO) is for down travel [add 14 inches for up travel ], “Take Out (TO) is for up travel [add 4 inches for down travel], “Take Out (TO) is for up travel [add 6 inches for down travel], “Take Out (TO) is for up travel [add 8 inches for down travel], “Take Out (TO) is for up travel [add 10 inches for down travel], “Take Out (TO) is for up travel [add 12 inches for down travel], “Take Out (TO) is for up travel [add 14 inches for down travel], Insulated Pipe Supports (Figures 4500-4800), Pipe Shields Insulated Pipe Supports (Cold & Hot Shoes), High Temperature Pipe Supports (Hot Shoes), Pipe Stress Analysis Case Study – Pump Discharge, Spring Support and Expansion Joint Audits, Emergency Custom Steel Structure and Support Design and Fabrication, Case Study: Fig. The tables, please call for DIMENSIONS that increasing or decreasing the load indicator to structure... 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