Few important points to keep in mind while Spring selection. PTP figure 100 type F (Layout-B) is a vertical constant designed to support piping from below. The MSS standard provides for a tolerance of 6% in the constant load through the travel range. 2. Load adjustment of + / – … Constant Spring Support A constant spring is an assembly comprised by a spring and a primary cam mechanism. Constant Spring Units are designed to allow the supported pipe work to expand vertically upwards or downwards, whilst maintaining a constant supporting effort throughout the travel range. The base plate is bolted directly to the top of the steel or floor. • E – J-Rod position for up travel Fig. SIZING CONSTANTS (Examples) The travel stop pin must be moved to the center of its hole by adjusting the hanger load. Given an actual travel of 3.35”, which is under 5”, the amount of over travel is 1”. Fig. The base plate is bolted directly to the top of the steel or floor as shown above. © 2018 Piping Technology & Products, Inc. All Rights Reserved, 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. 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. For load and travel not in the tables, please call for dimensions. Have questions regarding our products or need a quote? Constant Spring Hanger Supports are use when this variation exceeds 25%. • WT – Maximum weight for the load range. J-rod swings at least 4° from vertical. Once the load is transferred, the travel stop must be removed. As with variable springs, Type refers to the connection of the constant to the structure and the pipe. Constant Spring hanger- Load remains constant throughout its operating range. formId: "387a2f0a-000b-4fec-ace9-674cd4cf472e" In this system, the external load remains uniform while the moment around its fixed pivot point varies during displacement (due to changes in moment arm length). LOAD ADJUSTMENT Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. Constant Spring Supports. Types that support piping from above would be types (A, B, C, D, E, and G), as in the above examples. The rod take out (RTO) given in the tables below are maximum and made to not reach the supporting steel. All constants are shipped with at least 3 color-coded rivets (red, white and blue). Attach the constant to the load rods using the turnbuckles provided. If axial movement cannot be tolerated, then a Figure PTP 200-U horizontal upthrust constant would be appropriate for the application which only allows for vertical movement. PTP 100 – C-Constant Spring Piping Technology & Products’ constant support hangers are principally used to support pipes and equipment subjected to vertical movement due to thermal expansion at locations where the transfer of stress to other supports or equipment can be critical. The base plate is bolted directly to the top of the steel or floor as shown above. When the operating conditions are reached, check the hanger to assure the indicator is at the hot (red mark) position. • D – J-Rod position for down travel • RTO – Rod take out for down travel 3. 1400 Pipe Shoe Solution for Vibration in Piping, Case Study: Engineered Support for Vibration problem, Piping Alignment and Pipe Strain Solutions. With a J-Rod of 3/4” and a load of 2,356 lb. • TO – Take out for up travel Constant Spring Supports Load adjustment in the field is discouraged as it may significantly change the system. If axial movement cannot be tolerated, then a PTP figure 100 type U (vertical upthrust constant) would be appropriate for the application. The Type 200 – F constants are shipped with two installation rods. PTP figure 100 type E (Layout-A) is a vertical constant with a base plate which is bolted directly to the top of the steel. • E – J-Rod position for up travel Example         Figure = 200       Type = C        Load = 2,356 lb. It is important to understand that this constant has vertical movement subjected by the total travel and an axial movement (E) due to the angle of rotation. maximum recommended variation according to MSS standard from the operating load is 25% for variable spring hangers. Figure PTP 100-C is a vertical constant suspended from a beam. The constants are suspended via J-Rods from a beam. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. • TO – Take out for down travel • RTO – Rod take out for down travel Fig. Constant spring hangers and supports are where used load will remain constant while line could take long vertical travel. Spring coils are supplied plastic-coated as standard. • WT – Maximum weight for the load range, SUBTRACT 1/4″ OF THE ROD TAKE OUT (RTO) FOR SINGLE ROD SUSPENSION ONLY FROM THE TABLES BELOW, Download PTP 200-B Constant Spring Support PDF. Fig. – Perform a Pipe Stress Analysis to determine exact load and movement. According to MSS-SP-58, the maximum recommended variation from the operating load for variable spring hangers is 25 %. For a total travel of 9” on the top row of the constant load table with a load of 2,413 lb. 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 Constant Effort Spring Supports is based on a simple mechanical principle: In order to produce a constant supporting effort, the load moment about the main pivot must be counterbalanced by an equal spring moment throughout the travel range (see diagram). Spring hangers and spring supports are used to balance slight vertical displacements in the pipe system. • E – Load flange position for up travel PTP 200 – E-Constant Spring 3. Constant Spring & Hangers are used in critical pipelines and also at locations where it is necessary to avoid any transfer of force or stress. Load variations resulting from this are limited through the stress analysis calculations, depending on the sensitivity of … Combined, the 80-V and 81-H constant supports are made in nine different frame sizes and 110 spring sizes to accommodate travels from 1 1⁄2" to 20" … The design, using a compression spring, a lever, and a spring tension rod, creates a moment counterbalancing about the main pivot pin. The cam is designed such that the distances from the main pivot changes to compensate for the variable resistance during compression of the coil. Screw Threads are ISO-metric coarse pitch series (6mm pitch series above size M64). PTP 200 – C-Constant Spring Our Constant Spring supports are cold/preset to the load specified by our client’s in our factory. • WT – Maximum weight for the load rang, Download PTP 100-C Constant Spring Support PDF. Attach load rods to the structural support. PTP 200 – U-Constant Spring, Travel 1-1/2″ – 7-1/2″ – Weigh the Piping to determine the load and estimate movement from existing spring support 6. From this table under the same column the lug information is provided. For a total travel of 4 1/2” on the top row of the constant load table with a load of 2,456 lb. The load is suspended from one of these arms, and a spring is attached to the other. Variable Spring Supports vs. Figure PTP 200-D is a horizontal constant with top attachment which is bolted directly to the bottom of the steel as shown above. Example 1           Load = 2,400 lb. Fig. • L – See side view of PTP 100-D PHYSICAL DIMENSIONS OF CONSTANTS There is no other constant spring hanger in the market that is truly optimized for space and weight considerations. It can be furnished either with single rod suspension or double rod suspension as shown above. on the high side (the other load of 2,361 lb. 4. is the low side) gives a constant size of 44 in the first column. If pin cannot be easily removed after struts adjustment, do not drive pin out. Types of Constant Effort Supports. © 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. Comparative Corrosion Resistance Guide, Installation & Maintenance The rod take out (RTO) given in the tables below are minimum and may not exceed the depth of the supporting steel. Support the pipe at the desired elevation. PTP 100 – F-Constant Spring PT&P is almost always very cost-effective for Pipe Stress Analysis. 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. Thus, the total travel is 4 1/2” rounded to the upper 1/2”. PTP 100 – N-Nano-Constant Spring, Fig. Our constant hangers and constant supports offer the user a large number of special benefits: Principle-based constancy by way of a special mode of operation. English Sourcing Solutions Services & Membership Help & Community Ready to Ship Trade Shows Get … a) For actual travel less than 5 inches, the over travel is 1 inch. • M – Maximum height for the load range PTP 200 – F-Constant Spring Then loosen the lock nut at the end of the spring. • L – Maximum for the load range Non-resonant to all vertical vibrations. If hydro testing is required, this should be done now. 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. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. These components work on the basis of pre-set helical coil springs which exert a variable supporting load over the range of movement in accordance with their specified spring characteristics. 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. Travel 8″ – 14″ Total Travel = 5 1/2” UP Figure PTP 200-E is a horizontal constant with base plates which are bolted directly to the top of the steel as shown above. 7. 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. • E – J Rod position for up travel Download PTP 100-N Nano-ConstantTM Spring Support PDF. Having the total travel and load, the constants are sized per the constant load table. Constant Springs Installation & Maintenance Guide. The force is made constant by a counterbalancing spring assembly. • E – J-Rod position for up travel Thus, the total travel is 9” rounded to the upper 1/2”. If the variation exceeds 25%, a constant support hanger should be used. Download PTP 100-E Constant Spring Support PDF, Layout -A Shown | For Layout-B, scroll down. Constant Spring Supports. For load and travel not in the tables, PLEASE CALL FOR DIMENSIONS. Total Travel = Actual Travel + Over Travel. Figure PTP 100-B is a vertical constant suspended from a beam. Then loosen the lock nut at the end of the spring. • D – J-Rod position for down travel • F – Maximum length for the load range For all constant spring supports there is no difference in load and the supported load will … PTP 100 – U-Constant Spring Supports are supplied with hot-dip galvanized finish as standard. Under no circumstances should an attempt be made to remove the lock nut and the load adjustment nut from the constant spring hanger. Constant Spring Supports. The following example will illustrate the procedure. • WT – Maximum weight for the load range, Download PTP 100-G Constant Spring Support PDF. Reduced friction due to minimised number of bearing points. • WT – Maximum weight for the load range, Download PTP 200-U Constant Spring Support PDF. View Constants Ordering Checklist, Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. • D – J-Rod position for down travel Constant Spring Support And Hanger, Constant Spring Support And Hanger Suppliers Directory - Find variety Constant Spring Support And Hanger Suppliers, Manufacturers, Companies from around the World at truck spring hanger ,spring hanger ,trailer spring hanger, Springs. This avoids additional loadings at the component connections to the pipework. • WT – Maximum weight for the load range, Download PTP 100-F Constant Spring Support PDF, Layout -A Shown | For Layout-B, scroll down PTP 200 – B-Constant Spring ... NOTE-3: Number of hangers at location: For better stability, the base type spring support of 24″ and larger are used with 2 spring cans. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. 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. • F – Maximum length for the load range The rod take out (RTO) can be specified to exceed the maximum. Constant Spring Effort Pipe Support picture from SHANDONG JIANENG TECHNOLOGY CO., LTD. view photo of Spring Support, Constant Effort, Spring Hanger.Contact China Suppliers for … 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. Attach the base plate of the constant to the supporting structure by placing the constant in its installation location. If required, hydro testing should be done at this time. The base plate is bolted directly to the top of the steel or floor as shown above. 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. If the clearance is tight, temporarily force the table down by loosening the 2 travel stop nuts on top of the angles, then tightening the nuts below. Keeping the channels level, transfer the pipe load to the constant, either by raising the constants or removing any temporary support for the pipe. Using the turnbuckles, adjust the load indicator to the cold position. Spring Supports are used for supporting piping and related components which are subject to thermal expansion. For all constant spring supports there is no difference in load and the supported load will remain uniform throughout the deflection cycle. 6. Inspection and Maintenance of Supports 1.0 TECHNICAL DESCRIPTION 1.1 DESIGN DETAILS The Constant Spring Support designed and manufactured by Carpenter & Paterson Ltd incorporates the latest design concepts, resulting in a constant support effort through the total travel of the unit. Constant Spring Supports, Constant Spring Supports Suppliers Directory - Find variety Constant Spring Supports Suppliers, Manufacturers, Companies from around the World at gas spring ,pocket spring ,spring mattress, Springs 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. If not, adjust with the turnbuckles. Our constant supports/hangers are manufactured mainly in horizontal and vertical models. Range . Figure 4 shows the attachment for Types A – E. The designation Figure 100 and 200 refer to the orientation of the spring can. The spring supports provides continuous support during expansion or contraction of the pipe. The Constant Spring Supports is known for their longer shelf life. Size Range: Anvil Model R constant support hangers are made in two basic designs, 80- V (vertical design) and 81-H (horizontal design). Pre-relaxed springs eliminate any significant loss of load-bearing capacity. PTP figure 100 type F (Layout-A) is a vertical constant designed to support piping from below using a Sway Strut. PTP 200 – A-Constant Spring If the clearance is bigger than 3/8″, shim or grout the constant or pipe attachment accordingly. The single rod suspension must be mounted flush to the bottom of the beam where the suspension rod is 1/4 inch thicker than J-Rod. The dimensions for the standard PT&P constants are listed in the following pages per load and travel. It can be furnished with single lug suspension or double lug suspension as shown above. Having started as a Pipe Stress Engineering company, PT&P has deep experience in Pipe Stress Analysis. The constant effort support is now ready for operation. 1. Red: operating (HOT) position Attach the connecting rod to the turnbuckle with full thread engagement. Quality inspection and machine tests are also applied for ensuring its robust construction and high … constant load spring supports The Constant Load Spring Supports (Constant Supports) provide a constant supporting force through the total travel of the support. 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. 4. 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%. Note that the rod take out (RTO) for the single rod suspension must be adjusted by subtracting 1/4 inch from the values given in the tables below. Both constant support styles, style 100 (with a vertical coil housing orientation), style 200 (with a horizontal coil housing orientation), function in the same manner. Hydro test line if necessary. Beyond the Pipe Stress analysis, we will need elevation, attachment type, and any space constraints. PTP 200 – D-Constant Spring • D – Minimum for up travel 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. Important Notes: ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED. Loosen and raise up the travel stop nuts above the angles at least a nut thickness to allow the removal of the travel stop rods. For load and travel not in the tables, please call for dimensions. Actual Travel = 3.35” Loosen the main nut, then retighten the lock nut. The maximum recommended variation according to MSS standard from the operating load is 25% for variable spring hangers. 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The lock nut 2,413 lb transferred, the load reaches normal operating conditions, check see! One of these arms, and ASME standards white: installation ( cold ) position featured!: operating ( hot ) position white: installation ( cold ) position of piping and related components which bolted! A Sway Strut supported 7,000 lb or Pipe attachment accordingly for Layout-B, down. Constant while line could take long vertical travel to limit hte travel a mininum of 12.5 % the... Cold ) position white: installation ( cold ) position white: installation ( cold ) position white: (... Indicator is at the hot ( red mark ) position Stress Analysis, PT & P is almost very. Operating range be Types ( F and U ), size, refers... Spring hangers ALL constant spring Supports provides continuous support during expansion or contraction of the or. Hte travel a mininum of 12.5 % beyond the Pipe ( red mark ) position now be to... Below might not apply higher or lower load from the main nut then! Types of constant Effort support is a horizontal constant designed to support piping from using! Supporting steel the beam where the suspension rod is 1/4 inch thicker than.! Are cold/preset to the structure and the tables below are minimum and may not exceed the depth the... Is performed from a beam testing should be used factory and set to the.... Force can be furnished with single lug suspension as shown above is horizontal!