Equivalent Length Of Duct Fittings
13) where L is the length of pipe run between the sections. Length Allowance for Fittings (feet) Pipe Nominal Diameter (1" to 6") Mean Velocity at Flow Conditioins (ft/sec) Gas Density at Flow Conditions (lb/cu ft) Pressure Loss (psi) Note: A friction factor of 0. Pressure drop in a pipe due to fittings such as elbows, tees, valves, expanders and reducers based on 3K and 2K method. Each circular pipe section is supplied with a single offset joint and a pre-lubricated rubber gasket, which is tested to a hydro-static pressure of 103 kPa (15 psi). The inputs can be adjusted by touch, and installation is automatic. to the actual length of the pipe(b). Equivalent Tubing Length: Along with the pressure loss through the supply tubing, any pressure loss through fittings, shut off valves, ball valves, manifolds in the system must be taken into account. duct board triangle = 5. 6 shows an equivalent length of 14. Shop for Plastic Elbows at Ferguson. 7m) Length Low Side - LLS (Depth greater than or equal to 1. One method of duct design relies on calculating the total effective length, which is the sum of all the lengths of the straight sections of duct and the equivalent lengths of the fittings. The summary of Loss Coefficient run in tandem with Duct Sizing summary. a branch duct serving an individual box may be the same size as the box inlet, provided the equivalent length of the branch duct, as shown, does not exceed 10 feet (3 meters). Generally speaking, there is a short distance of unthreaded pipe between the two threaded ends, depending on how far apart you need the attached fittings to be. It includes 30' of 4" pipe, a 90 deg elbow, a check. Then use the adapter included with your hookup kit to connect the flexible gas line. Standard fittings include tees, wyes, elbows, saddle branches, reducers and manifolds for detention systems. 5 m 3 /s, calculate the pressure drop where L=400mm. Normand & Micha Peleg This Demonstration estimates the equivalent length of a pipe that determines the frictional pressure drop in fluid flow by converting the number of fittings and valves into an analogous length and adding it to the actual length. First, an accurate total equivalent length must be established, using fitting equivalent lengths, to calculate an "Allowable Pressure Drop". This value is the comparison “length” of this fitting to an equivalent length of straight pipe or duct. Read Round Duct Diameter (inches) and Friction Loss Per 100' of duct (inches of water). 6 Ductwork Air Leakage 39. This is recorded at the Fluid Mechanics Laboratory, IIT-Gandhinagar, India. Example: Determine L (friction loss in pipe fittings in terms of equivalent length in feet of straight pipe). The length L of the fitting would be based on the dimensions of the ducting. For example. Pipe fittings, such as bends, elbows or valves, have complex flow patterns. TEPL is the Total Equivalent Pipe Length of a flue pipe. / CPVC pipe or fittings can result in explosive failures and cause severe injury or death. Because of the importance of friction loss in civil engineering and in industry, it has been studied extensively for over a century. For example, if a 2" 90 o elbow were to produce a pressure drop of 1 psi, the equivalent length would be a length of 2" straight pipe that would also give a pressure drop of 1 psi. 613 to get the answer for the diagonal. TWIN PIPE PVC/CPVC VENTING GUIDE FOR CONDENSING TANKLESS WATER HEATERS. These two forms may be used interchangeably for DWV applications. These charts are usually not able to be used for a system design and are often misleading. Fittings shall be designed to withstand a minimum of 755 psi quick burst pressure @ 73oF tested in accordance with ASTM D1599. The section-by-section approach easily incorporates existing ductwork and fittings. So multiply the length in inches of the curve through the center of the elbow by 12. Order the cap and any transitions needed in advance. Friction losses through fittings are calculated from the equivalent length of straight pipe that would produce the same friction loss in the fluid. Fitting Standards Rev: 2. 5 energy is due to elevation above a reference datum and is often negligible in HVAC duct design systems. The total static pressure is a function of the (2a) duct friction losses, (2b) duct fitting losses and (2c) miscellaneous equipment losses. Many types of one-touch fittings for standard pipe. Air Grilles : Air Diffusers : Air Quailty Pipe Fittings Equivalent Length (m or ft) Equivalent Length (m or ft). It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. 31 – HVAC DUCTS DESIGN AND CONSTRUCTION STANDARD_____ D. DUCTWORK DESIGN CONSIDERATIONS 33 11. FR = (ASP x 100)/TEL, or use friction chart. Check out our extensive online product reference manual. Therefore the pressure loss is 0. Often the equivalent length of a fitting can be equal to or longer than the straight duct lengths due to the additional friction of turning air. (EMT) fittings 069 – 088 Flexible cord and cable fittings 089 – 092 Poate rbl cod r and cable fittings 093 – 098 Sceevre i ntrance cable fittings 099 – 122 qLguii blelehdi ftxti - metal conduit fittings 123 – 129 Liquid-tight flexible nonmetallic conduit fittings 130 – 139 Armoured cable and flexible metal conduit fittings. Ductile Iron Fittings Ductile iron fittings shall be sand cast in accordance with the European Standard EN 545:2010. 01 Ductile Iron Pipe and Fittings. Does the "Fan Static Pressure Calculations" Program include all possible types of duct fittings? Does it use actual duct fitting loss "Coefficients" like ASHRAE or SMACNA, or does it use equivalent lengths for fitting losses? No, the program does not include "all possible types" of duct fittings in the database. Air Handling Units. Ask The HvacMan. fittings, multiply the weight factor by the weight per foot of covering used on straight pipe. The Fabrication products allow for the following 2 types of Resistance Tables: Those that calculate the Pressure Drop using a resistance factor. This is called the Critical Length and represents the hundreds of feet of pipe in which you can. 9) and example weights for long radius elbows Notes - Dimensions quoted in mm are 'Nominal' values from B16. Other Hart & Cooley Mobile Tools. Fitting equivalent length and total fitting friction will be displayed in the calculated results for each pipe section. DUCTILE IRON TR FLEX Pulling Force at Equivalent Pressure for HDD Applications ® TR FLEX RESTRAINED JOINT DUCTILE IRON PIPE AND FITTINGS ® All Dimensions are in Inches Nominal Pipe Size Pipe O. (SMC) TDC, Slip/Drive and Raw Sheet Metal Connectors, Inc. Friction loss data for the fittings is found on the pages of the catalog directly following the friction loss data for the pipe. Adds an adjustment for Metric Equivalent Fitting Length values. ABS pipe is sold in 10' and 20' lengths, plus 12' lengths in Canada. per square foot and not less than 1. Scheduling Sq Ft of Duct Fittings, Flex It is an important step in all HVAC designs at my company to determine the total square footage of ductwork with each design in order to facilitate both budgets and subsequent contractor pricing. The NFPA 15 Standard has equivalent lengths for valves and fittings based on the type of valve or fitting and the pipe size. 250 Where: D e is the circular equivalent of rectangular duct for equal length, fluid resistance and airflow, inch a is the length of one side of duct, inch b is the length adjacent side of duct, inch. nominal length = length of straight pipeline x 1. 28R End register boot 50. The pressure losses can be estimated using the fitting pressure loss calculator , which gives an equivalent pipe length to add to the overall. 24R 90º register boot 30’ EL No. EQUIVALENT LENGTHS PLENUM/DUCT FITTINGS No. Elbows, Sweeps and SwoopTMs Pressure Drop in Pipe and Fittings •Many materials and types of fittings Fittings and Equivalent Length. CheCalc Chemical engineering calculations to assist process, plant operation and maintenance engineers. , Texas A&M University Chair of Advisory Committee: Dr. Find the static head, the static pressure, the dynamic head, and the actual pressure of the water as it enters the residence. The way this pressure loss is accounted for is the equivalent length. 16 "wc Total Effective Length (TEL) of longest run TEL = equivalent length of fittings + length of duct. 2) to be given by hh 4f L D V 12 2g 2 −= (9. Frictional losses do not impact velocity pressure. elbow, 90 ° check valve, swing type. In the equivalent length method, it is assumed that there is some length of pipe Leq that has the same friction loss which also occurs at the fitting, at a certain Reynolds number. If you would prefer 3m lengths, please contact us. TECH TIP # 10. The information given in the chart above illustrates the resistance of fittings to the flow of liquids. Read across until a capacity equal to or greater than the required demand for the section is found. For wall thicknesses in excess of 0. With their ability to accommodate non-traditional angles, fabricated fittings and are typically used in 12” and larger applications where molded fittings are not available. 1 assigns equivalent pipe lengths to fittings. IPEX USA LLC supplies one of the world's most diverse lines of integrated thermoplastic piping systems-pipe, valves, fittings, auxiliary components and tools-all engineered from the ground up to handle the full range of today's municipal, industrial and electrical applications. The AmeriVent gas vent line allows you to create almost any system from our more than 350 coordinated parts. Frictional losses occur at the expense of static pressure. Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. As noted in AWWA C111, flange joints in the 24” and smaller sizes may be rated for up to 350 psi with the use of spe- cial gaskets such as AMERICAN’s Toruseal®. of total. Equivalent length is exactly what it sounds like. C900 pipe is delivered in standard laying lengths of 20 feet +/- 1 Inch. Threaded 125# Black Cast Iron 90 Degree Elbow. Losses from fittings are expressed in equivalent length, meaning the length of straight tubing that would have thesame pressure loss as the fitting. • Valve weights are approximate. AGS™ Grooved Fittings for Schedule 10S Stainless Steel. For any valve, a length over diameter (L/D) coefficient can be determined by equating the pressure drop through the valve to the equivalent length of pipe measured in pipe diameters. Ductile iron C110/A21. 5 degrees, the true offset is multiplied by 2. secondary plenum =. per square foot. 2 mm) or less. Where fitting curvature or internal member attachments provide equivalent rigidity, such features may be credited as reinforcement. If a pump is able to produce the power that can overcome the losses then the. One method of duct design relies on calculating the total effective length, which is the sum of all the lengths of the straight sections of duct and the equivalent lengths of the fittings. Some recommendations are given by Agarwal  in an article published in 2005. PIPE FITTING FRICTION CALCULATION The friction loss for fittings depends on a K factor which can be found in many sources such as the Cameron Hydraulic data book or the Hydraulic Institute Engineering data book, the charts which I reproduce here in Figures 1 and 2. The NFPA 15 Standard has equivalent lengths for valves and fittings based on the type of valve or fitting and the pipe size. Smith Products www. Model LT45 has a four-inch diameter (the standard for dryer duct pipe) and a nine-inch overall length. Equivalent Length Pipe Fitting Suppliers - Find Listings of Equivalent Length Pipe Fitting Manufacturers and Suppliers from Chinese Wholesalers and Global Distributors at B2BFreezone. Friction losses through fittings are calculated from the equivalent length of straight pipe that would produce the same friction loss in the fluid. Elbows, Sweeps and SwoopTMs Gary Klein Gary Klein and Associates, Inc. Total equivalent length = 240 feet (Piping & all fittings, etc) NOTE − Length is general guide. 5" pipe is equivalent to 9. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. 2 mm) or less. Determine the static and dynamic pressure drop for fittings from ASHRAE table for duct fitting codes. Fitting e L D 45O elbows 15 90O elbows, std radius 32. 03 JOINTS A. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. Equivalent Length of Fittings. Key Terms & Concepts. This is recorded at the Fluid Mechanics Laboratory, IIT-Gandhinagar, India. 1 OVERVIEW: DENIS FORMULA James S. 1 fittings, but differ slightly in wall thickness. ASTM A234 fittings material consist of killed steel, forgings, bars, plates, seamless or HFW (fusion welded) pipe products, with filler metal added. ALLOWABLE PIPE SIZE, CLASS AND MATERIALS FOR WATER MAINS. TEPL is the Total Equivalent Pipe Length of a flue pipe. 7" round spiral duct. 14 Ferrous Pipe Plugs, Bushings, etc. Specifically, a larger duct is necessary for the 3660 or 4860 unit before splitting the flow or if the plenum length is more than 150 feet. Product Reference. Ductwork is fabricated. For the purposes of calculating the total friction loss of a system, the sources of form friction are sometimes reduced to an equivalent length of pipe. Determine your air compressor’s maximum CFM. Friction and turbulence both result in static pressure drops and reduce air flow. This restriction (friction loss) adds to the TEL (total equivalent duct length) of the system. To get the total equivalent length of the cir-cuit add the equivalent lengths of all fittings and valves to the total length of straight tubing. Pipe fittings, such as bends, elbows or valves, have complex flow patterns. In addition, standards such as ASHRAE Standard 90. ) (in m or ft. For example. Where fittings are used, the maxi-mum length of the exhaust duct shall be reduced in ac-cordance with Table M1502. A small amount of scale can in fact make a rough pipe smoother as scale would tend to collect in crevices and so reduce the relative roughness of the pipe. The pressure losses across multiple interactive and individual in-duct fittings are compared (see Table 5). Fittings meet DR18 requirements of AWWA C-900. 2 m) See Table 6, 8, and 11 for maximum total equivalent length. Friction losses in these fittings are usually expressed in terms of the equivalent length of pipe that would have the same head loss. 4) As pipe size increases the equivalent footage of pipe fittings increases 5) Elbows with hard edge turns have more than double the pressure drop of sweep turns. 45 deg boot w/reg = 8. A graphical depiction of friction loss through PVC pipe developed from the PVC table is presented to provide a quick reference. 00 Rectangular Size, in. But you can get the answer exactly by asking your pipe fitting vendor. The actual pipe's length, from 0 to 100 meters, and its diameter, from 0. The line pressure drop is greater by about 4. THE WELDOLET PROVIDES 100% PIPE STRENGTH FOR ALL SIZES, WEIGHTS AND SCHEDULES. ) (in m or ft. CAD ： 2D / 3D. Each type of fitting is assigned an equivalent length, which is the length of straight duct of the same type and size that would give you an equivalent amount of friction (or pressure drop). On previous ductwork pages we discussed the single fitting and it's contribution to the system's overall TEL (total equivalent length). : attic or basement). This length is called the 'Equivalent' Length. This restriction (friction loss) adds to the TEL (total equivalent duct length) of the system. 9, center to elbow dimension for 4 in elbow is 152 mm. NOTE: The sizing charts above list the specific pipe sizes required for the amount of BTU’s for a new gas line. flanges, bends, valves, reducer, fabrication of tees, fitment of non return valve, valves, gaskets, nut bolts, sockets for pressure gauges fabrication and fitment of thermowell, etc. Like pipe friction, these losses are roughly proportional to the square of the flow rate. 916-549-7080 [email protected] The types of fittings to be used based on the designer's calculations of fitting losses (i. Piping should be sized to maintain a velocity of less than 8 feet per second in pipe sizes less than 1 inch, and less than 5 feet per second in diameters of 1… inches or larger. About file types supported by ASHRAE Duct Fitting Database File. This cool, easy-to-make pipe lamp will create a trendy look for your desk or table. Equivalent feet (or length) refer to the number of feet of straight duct that imposes the same resistance to air flow as a particular fitting. 577 for a fitting angle of 60 degrees. Normand & Micha Peleg This Demonstration estimates the equivalent length of a pipe that determines the frictional pressure drop in fluid flow by converting the number of fittings and valves into an analogous length and adding it to the actual length. Culp Airflow pressure losses through rigid metallic and non-metallic flexible ducts were studied and recommendations to improve the rating of flexible ducts were made as. Use of other couplings or flange adapters may result in bolt pad interference. Equivalent length is the length of pipe with diameter and friction factor having the same energy loss as a fitting. This is typical. Some of the above fittings are not listed in AWWA C110 but do meet applicable requirements of AWWA C110. DUCTILE IRON TR FLEX Pulling Force at Equivalent Pressure for HDD Applications ® TR FLEX RESTRAINED JOINT DUCTILE IRON PIPE AND FITTINGS ® All Dimensions are in Inches Nominal Pipe Size Pipe O. SewerPRO ® pipes are classified as SN10 with a minimum stiffness of 10000 N/m/m and are available in 3m lengths in sizes from DN 150mm to DN 900mm. When this length is exceeded. Creating New Resistance Tables. Copper pipe is suitable for plumbing, boiler feed lines, refrigeration and for similar purposes. Determine your air compressor's maximum CFM. Note that the equivalent length of run becomes more significant as the pipe size increases. NPT/NPS threads have a 60° angle and have flattened peaks and valleys (Sellers thread form) where as BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form). Provide balancing dampers at supply, return, and exhaust branches when connected to larger ducts, as required, for air balancing. Such length of straight pipe is designated as an equivalent length of the fitting. Trupply offers seamless pipe for convenient online shopping in various lengths. 29 show resistance coefficients for sudden contractions and enlargements and for pipe entrances and exits. Spears® PVC and CPVC Pipe, Fittings and Valves have always been lead-free and Certified by NSF International for use in potable water systems. Consequently, the total pressure (or total energy) of air flowing in a duct system is generally equal to the sum of the static pressure and the velocity pressure. run valve valve valve valve of tee. API 5L pipe length tolerances shall be complied as following conditions: a. Water Pipe Sizing Calculations. authorities gave us the details of diameter, length and material of pipelines is being used at present. 5 m 3 /s, calculate the pressure drop where L=400mm. the equivalent length of run is 15 + 10 = 25 feet. ) (in m or ft. See Figure 1 for an illustration of a pipe that has been longitudinally bent. 5 energy is due to elevation above a reference datum and is often negligible in HVAC duct design systems. • From the table, determine the length of each pipe section using the appropriate table, using only the row with the longest length. AGS™ Grooved Fittings for Schedule 10S Stainless Steel. length 3'-0" [900mm]. An estimate of the equivalent lengths of the fittings can be provided using the adjacent program or accepted on an approximate basis by adding 60% onto the length of the straight pipeline, e. If the overall pressure drop is equivalent to a pipe length of 16 diameters, and the pressure drop due to the actual flow path length (which is affected by the roughness) is equivalent to only 2. A53 seamless and welded steel pipe is produced in random lengths 16’ – 22’ or 32’ – 44’ Galvanizing. 018" 304, 316, or galvalume steel. PVC - Friction Loss in Fittings and Equivalent Length - Minor loss in PVC and CPVC fittings as equivalent length of straight pipe PVC Pipes - Friction Loss and Flow Velocities Schedule 80 - Water flow in thermoplastic PVC and CPVC pipes Schedule 80 - friction loss (ft/100 ft, psi/100 ft) and flow velocities at dimensions ranging 1/2 to 16 inches. 16 "wc Total Effective Length (TEL) of longest run TEL = equivalent length of fittings + length of duct. of total. The maximum deflection angle in Table "4" is used for design purposes and is based on eighty (80%) percent of the maximum recommended deflection set by WSSC for pipe sizes 20-inch and smaller and on AWWA C600 for 24-inch pipe. Length = 0. ) Standard Elbow Medium Radius Elbow Long Radius Elbow 45° Elbow Tee Return Bend Gate Valve Open Globe Valve Open Angle Valve Open Length of Straight Pipe Giving Equivalent Resistance Flow ½" 1. For straight sections of duct, we just use the measured length. The higher the friction rate is the smaller the duct can be to deliver a certain amount of air. The maximum length of the exhaust duct shall be determined in accordance with the manufacturer's instructions for the dryer exhaust duct power ventilator. Standard fitting pressure ratings conform to ratings of installed coupling. An elbow, a tee, or any other fitting that causes a change in direction will cause pressure loss. This can vary between about 10% and 40% depending on the complexity of the layout. Spears® offers a wide range of lead-free specialty fittings and transition adapters for plumbing applications. com 90° and 45° Long Radius Elbows - ANSI B16. 83 m) nominal length for indoor use; g) are of not more than 15 ft (4. Pipe work shall be carried out as per piping drawings/ specifications/ instructions given to construction engineer. sheet metal wye = 6. 8 Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets Table 14. 00 American Society of Heating, Refrigerating, this CD is useful to design engineers dealing with a variety of. added pressure drop is accounted for by adding extra length (see chart on page MI-11) to the piping run which will equal the same pressure drop produced by the fittings. Add up both the supply and return duct system in feet. For correct pipe and fittings connections, always use pipe and fittings with the same nominal pipe size. When ordering hose assemblies, please keep the terminal end. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially. 4) As pipe size increases the equivalent footage of pipe fittings increases 5) Elbows with hard edge turns have more than double the pressure drop of sweep turns. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files. 25 to 25 centimeters, are entered with the top two sliders in the panel. On the stove end, use another flare-to-pipe-thread fitting. 27R Straight register boot 5’ EL No. When calculating head loss using the equation provided above, the length (L) would include the length of the pipe line, plus the equivalent length of pipe corresponding to each fitting. The maximum length of the exhaust duct shall be 35 feet (10 668 mm) from the connection to the transition duct from the dryer to the outlet terminal. 3 Malleable Iron Threaded Fittings ASME B 16. BECAUSE obtaining complete test data on the pressure drop of every available size and type of valve and pipe fitting is impossible, a practical. Loss is given by - 2 h K v g ( /2 ) L = Where K is computed as - = e ( / )* K L D f t. Include measured length and fitting equivalent length. Bends and elbows shall be measured on the outside radius. The total static pressure is a function of the (2a) duct friction losses, (2b) duct fitting losses and (2c) miscellaneous equipment losses. Bengtson, PhD, P. The inputs can be adjusted by touch, and installation is automatic. 28R End register boot 50. 035" 304 or 316 stainless steel. Detailed calculation is not far different from the above calculation except for the exact equivalent length of each and every duct fitting that will be used instead of the safety factors. 00 American Society of Heating, Refrigerating, this CD is useful to design engineers dealing with a variety of. 28R End register boot 50. After you’ve cut the copper pipe to the proper length, clean the end of the pipe with this special cleaning brush. (December 2011) Kevin Douglas Weaver, B. The pressure loss in fittings is determined using the concept of “equivalent length. mum equivalent length of a 1/2" gas line for a Rinnai RUC98i tankless water heater with a capacity of 199,000 BTU is 40 feet. The reason is that if a HVAC system delivers 50,000 CFM of air output, the fact is that 50,000 CFM of air is not the total amount actually delivered to each room. NFPA #13 Table 14. 6 mm) plus or minus 0. * Polyethylene pipe will be carried during the transport of the vehicle must be full length of the pipe in the pipe tools and should be hanged out. SMC manufactures coil line ductwork in 4'-5'-6' lengths. Order online at PVCPipeSupplies. Every duct fitting and connection you use has an associated equivalent length. AGS™ Grooved Fittings for Schedule 10S Stainless Steel. The amount of flow restriction for valves and fittings is expressed in terms of equivalent lengths of pipe. Emerson Liebert Prop Fan Condensing Unit Manual Online: Figure 12 Refrigerant Piping Diagram, Table 5 Pipe Length And Condenser Elevation Relative To Evaporator, Table 6 Equivalent Lengths For Various Pipe Fittings, Ft (m). Air Handling Units. Seamless pipe is also very common in petrochemical industries for carrying high pressure fluid. Haihao pipe fitting department is the steel pipe fitting division of Hebei Haihao High Pressure Flange Pipe Fitting Group Co. Turning Vanes and Duct Elbows, Part 2 Posted on October 21, 2007 by David Sellers In the previous post , we were looking at how the number of turning vanes in an elbow impacted its performance and discovered that there are a lot of variables to consider. Example: Determine L (friction loss in pipe fittings in terms of equivalent length in feet of straight pipe). The actual pipe's length, from 0 to 100 meters, and its diameter, from 0. Add approximately 5 feet of pipe per fitting. fittings sized in accordance with the ASTM D 3982-92, Standard Specification for Contact Molded Fiberglass Duct and Hoods (replaces NBS Voluntary Product Standard PS 15-69). It includes 30' of 4" pipe, a 90 deg elbow, a check. TECH TIP # 10. , Cliffside Park, NJ. Metric to Pipe Conversion Chart Diameter Nominal DN (mm) Nominal Pipe Size NPS (in. 10M Product Welded and Seamless Steel Pipe Grades A, B. Houston, Texas 77029 Phone: (713)678-8471. / /The *Equal Friction* method creates an "initial guess" for duct sizing by establishing a constant pressure loss per unit of duct length. The dimensional requirements are indicated in the above mentioned Standards. For example, a 1 inch PVC Pipe is actually 1. They should be able to give you a chart of pressure drop for their fittings. Tube products are generally more costly because of the tighter tolerances. Pipe Thread Fittings A thread sealant should always be used when assembling tapered threads. Fitting equivalent length and total fitting friction will be displayed in the calculated results for each pipe section. Depending on the respective coating selected for the applicable environmental conditions, a service of 100+ years can be achieved. PIPE FITTING FRICTION CALCULATION The friction loss for fittings depends on a K factor which can be found in many sources such as the Cameron Hydraulic data book or the Hydraulic Institute Engineering data book, the charts which I reproduce here in Figures 1 and 2. The lengths of straight sections of duct add up to 36 feet for the supply side and 13 feet for the return side. All of the equivalent lengths caused by the valves and fittings within a pipe segment would be added together to compute the pressure drop for the pipe segment. , standard fittings for standard pipe and extra-heavy fittings for. If a pump is able to produce the power that can overcome the losses then the. nominal length = length of straight pipeline x 1. An additional length has to be added to the actual measured length of the ductwork to take care of the resistance offered by these items to supply air. Equivalent Length of a Pipe with Fittings and Valves Prepared by: Mark D. Or choose to utilize one of auto-draw systems. The maximum length of the exhaust duct shall be determined in accordance with the manufacturer's instructions for the dryer exhaust duct power ventilator. 916-549-7080 [email protected] 2 Air and Vent Piping Equivalent Length DO NOT mix pipe, fittings, cements, or joining. Additionally, corrugated steel pipe is available in a range of coatings, including galvanized (zinc coated), Aluminized Type 2, and polymeric film among others. Determine Equivalent duct diameter and find Duct size/dimension from ASHRAE table for rectangular shape. The reason is that if a HVAC system delivers 50,000 CFM of air output, the fact is that 50,000 CFM of air is not the total amount actually delivered to each room. These ratings are based on the ASME Codes for Pressure Piping. Resistance of fittings is expressed as Equivalent Length ("EL") of straight duct; a bad fitting might have an EL of 80 feet, a good one 10 feet. Provide follower gland using breakaway torque bolts to engage thrust restraint. Use the table belwo to determine the equivalent length of fittings: Dryer Exhaust Duct Fitting Type. FITTING EQUIVALENT LENGTHS Pressure losses in fittings are due to the turbulence created as water flows through the fitting. Taking the pipe length and number of elbows we calculated the equivalent length of the pipe work for pressure loss purposes. The head losses were then added to determine the equivalent lengths of pipes in order to validate Darcy-Weisbach method and others. Buttweld Fittings 6-7 Aalco Tel. 6 Duct Locations 27 10. Air Handling Units. Plain Duct End Flanged Duct End Bellmouth Entry Sharp Edged Orifice Standard Grinder Hood (tapered t. For fittings, though, we need to find the equivalent length (explained below) for each one. 120SC Snap collar, round 35' EL ROUND ELBOWS & ANGLES 90º elbows 30' EL 45º angles 10 - 20' EL REGISTER BOOTS No. S901-2 MATERIALS S901-2. Measurements were obtained for each accessory under 107 different conditions for laminar flow and 49 conditions for turbulent flow. Sell equivalent length pipe fitting to equivalent length pipe fitting importers from USA, UK, Canada, Australia & world over. Weight of hot-dipped galvanized coating shall not average more than 1. home reference library technical articles manufacturing and process equipment appendix d: equivalent lengths of pipe fittings Process Heat Transfer: Principles and Applications Providing the background needed to understand and master the commercial software packages used by professional engineers, this text investigates the design and. Please note: A 6m length of Class C PVC pipe may be supplied if two 3m lengths are unavailable. Check valve - 1 no. Continental Fan Manufacturing 8" Round Duct Y-Fitting. The illustration below shows how the.