Fluoropolymer Lined Composites (PTFE, FEP)
Durcor® is the world's first advanced structural composite piping system lined with seamless fluoropolymers. Its thick wall fluoropolymer liner provides maximum internal chemical resistance while Durcor's vinyl ester resin backbone eliminates the devastating effects of environmental corrosion externally.
Products made with Durcor technology include piping and fittings.
- Piping is currently offered in diameters of 1”- 8” with PTFE and FEP liners. Maximum lengths are 20’ but, for FEP liners in the 1”- 4” size, the maximum length is 50’.
- PTFE lined fittings include elbows, tees, reducers, and more.
Durcor technology further enables Andronaco’s total systems approach through its use in components of other products. Durcor flanges can be specified in expansion joints, hoses, and sight indicators. Additionally, some composite valves include Durcor technology.
Product Features & Benefits
- LIGHT-WEIGHT. ZERO-CORROSION: Durcor’s thick wall PTFE liner provides unmatched internal chemical resistance while its revolutionary vinyl ester / fiberglass housing provides outstanding exterior corrosion protection, high impact resistance and excellent span and burst capabilities. The construction of Durcor® offers the ultimate in physical properties and corrosion resistance.
- Zero corrosion rate
- Size range 1” to 8”
- Full vacuum rated
- Pressures to 275 psi
- Temperature ratings uninsulated -40°F to +300°F
- Superior strength to weight ratio
- ¼ the weight of steel
- Lower freight cost
- Lower installed cost
- Faster to install
- Safer to install
- No exterior priming or painting required
- ADVANCED STRUCTURAL COMPOSITE HOUSING:
- Durcor is the world’s first composite pipe designed exclusively to support free-standing PTFE fluoropolymer liners. Through a proprietary process, Durcor pipe is manufactured with glass fiber bundles, pressure saturated with a highly chemical resistant formulation of premium vinyl ester resin to provide maximum exterior protection. The fiberglass bundles are oriented in strict axial and hoop routes which provide outstanding impact, stiffness, and pressure capabilities.
- Durcor is dimensionally equivalent to schedule 40 steel pipe and can be essentially treated the same. Durcor also has excellent insulating properties and can often eliminate the need for tracing and/or reduced thickness of insulation required to maintain a given temperature.
- DURCOR PIPING SYSTEM IS NOT A DUAL LAMINATE:
- Durcor piping system should not be confused with dual laminate. Unlike dual laminate fittings & pipe, Durcor has excellent dimensional control and tolerance as well as outstanding surface quality. Durcor utilizes thick, seamless fluoropolymer liners that do not require any chemical or mechanical bonding to composite that could lead to delamination failure. Dual laminate liners typically are made from sheet that are rolled and welded to form geometrical shapes.
- The nature of the hand lay-up dual laminate process results in parts with inconsistent fiber orientations and resin wet-out. Resin is applied over glass with rollers and excess is removed with squeegees—the process is highly reliant on operator skill. The process typically generates a textured finish on inner surfaces which provides poor conditions for bonding between added layers. The resins need to be low viscosity to be workable by hand, which compromises their mechanical / thermal properties due to the need for high diluents/styrene levels. Porous voids are common in hand lay-up parts and tight dimensional accuracy and smooth surfaces are impossible. Lastly, this technique raises environmental and safety concerns with the amount of volatiles it generates and releases into the atmosphere due to rollers and squeegees being used to apply resin. Contact molding is also another term used for hand lay-up.
- AVAILABLE IN 50’ FOOT LENGTHS: Durcor FEP lined pipe spools are designed to save money by making installation faster and safer, with fewer potential leak paths. Flange connections are cut in ½ and ½ the number of bolts, nuts and washers are needed. Zero corrosion lets you focus on running your business, not fixing it. FEP lined Durcor 50' pipe spools are available in 1"-4" and will handle full vacuum and temperatures to 300°F.
- TRACEABILITY: Durcor PTFE lined fittings are the industry’s first to incorporate a date stamp showing month and year of manufacture for lot traceability.
Technical Details
Pipe Components
PTFE Maximum Chemical Resistance
Without question, PTFE (polytetrafluoroethylene) offers the broadest capabilities of any commercially available material. In Durcor®pipe, it will handle temperatures up to 300ºF and will resist:
- acids and solvents
- organic and inorganic chlorides & sulfates
- bleach solutions
- phenols and caustics
- peroxides
- as well as any combination of the above
PTFE also has incredible non-stick properties which eliminate and/or minimize deposits on pipe walls.
Durcor’s seamless PTFE liners exceed the requirements of ASTM F1545 where applicable. Liner thickness ranges from 0.130” for 1” pipe to 0.310” for 8” diameter piping. Durcor’s thick and strong liners aid in permeation resistance and are able to withstand full vacuum conditions throughout its full temperature range.
Thermosized™ PTFE Liners
Durcor’s thick, free standing PTFE liners undergo a battery of tests designed to ensure liner integrity prior to being positioned into its structural composite housing. Durcor’s unique Thermosizing process combines the PTFE liner into the composite pipe. An additional heating cycle then relaxes the liner for a snug, interference fit within the composite housing. The Thermosize technique provides PTFE dimensional stability under pressure, vacuum and temperature cycling condition.
Design
The same approach, practice and technique that was used to design this 21st century composite jet fighter was used to design Durcor’s advanced structural composite fittings. Through Finite Element Analysis (FEA), Durcor developed its sequence of fiberglass reinforcement placement. It improved Durcor’s strength to weight ratio especially in areas of critical stress. FEA provided the building blocks that give Durcor its ultimate in physical properties.
Consistency
Durcor fittings are manufactured in two-part closed molds and resin-injected, completely wetting out all fibers. Speed and pressures remain consistent, producing uniform product thickness that is void-free, smooth-surfaced, and ensures that all parts are identical to one another. Durcor's manufacturing process also offers health, safety, and environmental control due to enclosed resin injection, which releases fewer volatiles into the atmosphere, as well as offering less exposure to employees during manufacturing.
- Durcor fittings are typically 1/4 the
weight of alloy PTFE lined fittings. - Lower Freight Costs
- Lower Installed Costs
- Quicker to Install
- Safer to Install
Components of Durcor’s product line are manufactured to established dimensional standards, making them completely interchangeable with other PTFE alloy piping manufacturers.
All PTFE lined products are susceptible to vapor permeation by certain chemicals under certain operating conditions. Through osmosis, Durcor fittings allow any gas to freely vent without the need for vent holes.
Optimized NOT Compromised
PTFE Flare Diameters
| Size | Flare Dia. | |
| (in) | (in) | (mm) |
| 1 | 2.00 | 50.8 |
| 1-1/2 | 2.88 | 73.2 |
| 2 | 3.63 | 92.2 |
| 3 | 5.00 | 127.0 |
| 4 | 6.19 | 157.2 |
| 6 | 8.50 | 215.9 |
| 8 | 10.63 | 270.0 |
Pipe Data
Size Range: Piping is currently offered in diameters 1” – 8”
| Size | ID PTFE Pipe | Flare Dia. | Liner Thickness | Pipe OD | Dry wt/ft | Capacity | ||||||
| (in) | (in) | (mm) | (in) | (mm) | (in) | (mm) | (in) | (mm) | (lbs/ft) | (kg/m) | (gal/ft) | (ft3/ft) |
| 1 | 0.79 | 20.1 | 2.00 | 50.8 | 0.130 | 3.3 | 1.36 | 34.5 | 0.83 | 1.25 | 0.03 | 0.003 |
| 1-1/2 | 1.34 | 33.3 | 2.88 | 73.2 | 0.150 | 3.8 | 1.92 | 48.8 | 1.29 | 1.94 | 0.07 | 0.010 |
| 2 | 1.74 | 44.2 | 3.63 | 92.2 | 0.160 | 4.1 | 2.38 | 60.5 | 1.75 | 2.63 | 0.12 | 0.017 |
| 3 | 2.75 | 69.8 | 5.00 | 127.0 | 0.160 | 4.1 | 3.50 | 88.9 | 3.14 | 4.71 | 0.31 | 0.041 |
| 4 | 3.71 | 94.2 | 6.19 | 157.2 | 0.175 | 4.4 | 4.50 | 114.3 | 4.37 | 6.56 | 0.56 | 0.075 |
| 6 | 5.50 | 139.7 | 8.50 | 215.9 | 0.280 | 7.1 | 6.63 | 168.4 | 9.14 | 13.72 | 1.23 | 0.165 |
| 8 | 7.36 | 186.9 | 10.63 | 270.0 | 0.310 | 7.9 | 8.63 | 219.2 | 13.56 | 20.34 | 2.21 | 0.296 |
Maximum Pipe Length Available
| Size (in) | Length (ft) |
| 1 - 8 | 20 |
| 1 - 4 | 50* |
Pressure Ratings
| Nominal Pipe Size (in) | Max. Pressure @ (-)40°F (psi) |
Max. Pressure @ 75°F (psi) |
Max. Pressure @ 300°F (psi) |
| 1 | 275 | 275 | 230 |
| 1-1/2 | 275 | 275 | 230 |
| 2 | 275 | 275 | 230 |
| 3 | 225 | 225 | 175 |
| 4 | 200 | 200 | 150 |
| 6 | 175 | 175 | 125 |
| 8 | 150 | 150 | 100 |
Resists:
- Acids and solvents
- Organic and inorganic chlorides & sulfates
- Bleach solutions
- Phenols and caustics
- Peroxides
Dimensions and Weights
| Size | ID PTFE Pipe | Liner Thickness | Pipe OD | Durcor Weight | Steel Lined |
| (in) | (in) | (in) | (in) | (lbs/ft) | (lbs/ft |
| 1 | 0.79 | 0.130 | 1.36 | 0.83 | 2.1 |
| 1-1/2 | 1.34 | 0.150 | 1.92 | 1.29 | 3.4 |
| 2 | 1.74 | 0.160 | 2.38 | 1.75 | 4.6 |
| 3 | 2.75 | 0.160 | 3.50 | 3.14 | 9.1 |
| 4 | 3.71 | 0.220 | 4.50 | 4.37 | 13.0 |
| 6 | 5.50 | 0.280 | 6.63 | 9.14 | 22.8 |
| 8 | 7.36 | 0.310 | 8.63 | 13.56 | 32.1 |
| Size | Minimum Spool Length |
| (in) | "L" (in) |
| 1 | 3-1/4 |
| 1-1/2 | 3-1/2 |
| 2 | 4-1/2 |
| 3 | 4-1/2 |
| 4 | 5 |
| 6 | 7-1/4 |
| 8 | 7-3/8 |
Distance Pieces are used when you need more length than a spacer but don’t want the bulk of flanges.
| Size (in) |
OD (in) |
T | H | F | # Holes |
Hole Dia. |
Durcor Wt. (lbs) |
Ductile Iron Wt. (lbs) |
| 1 | 4.25 | .78 | 1-7/16 | 2-9/32 | 4 | .63 | 0.7 | 2.0 |
| 1-1/2 | 5.00 | .87 | 1-5/8 | 3 | 4 | .63 | 1.0 | 3.0 |
| 2 | 6.00 | .90 | 2-1/8 | 3-13/16 | 4 | .75 | 1.6 | 4.7 |
| 3 | 7.50 | 1.18 | 2-3/16 | 5-1/8 | 4 | .75 | 2.8 | 9.2 |
| 4 | 9.00 | 1.16 | 2-3/8 | 6-5/16 | 8 | .75 | 3.6 | 12.4 |
| 6 | 11.00 | 1.19 | 3 | 8-1/2 | 8 | .88 | 4.6 | 16.8 |
| 8 | 13.50 | 1.38 | 3 | 10-5/8 | 8 | .88 | 7.8 | 28.0 |
| Dimensional Data | Compare Weights | |||
| Size | A (in) | C (in) | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1 | 1-3/4 | 2 | 1.3 | 5.5 |
| 1-1/2 | 2-1/4 | 2-7/8 | 2.1 | 8.0 |
| 2 | 2-1/2 | 3-5/8 | 3.1 | 11 |
| 3 | 3 | 5 | 6.4 | 22 |
| 4 | 4 | 6-3/16 | 10.2 | 39.5 |
| 6 | 5 | 8-1/2 | 16.7 | 63.0 |
| 8 | 5-1/2 | 10-5/8 | 28.1 | 110.0 |
| Dimensional Data | Compare Weights | |||
| Size | B (in) | C (in) | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1 | 3-1/2 | 2 | 1.5 | 6 |
| 1-1/2 | 4 | 2-7/8 | 2.4 | 9 |
| 2 | 4-1/2 | 3-5/8 | 3.5 | 14.0 |
| 3 | 5-1/2 | 5 | 7.7 | 26.0 |
| 4 | 6-1/2 | 6-3/16 | 10.6 | 41.0 |
| 6 | 8 | 8-1/2 | 19.5 | 75.0 |
| 8 | 9 | 10-5/8 | 32.9 | 125.0 |
| Dimensional Data | Compare Weights | |||
| Size | B (in) | C (in) | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1 | 3-1/2 | 2 | 2.6 | 10.0 |
| 1-1/2 | 4 | 2-7/8 | 3.7 | 14.0 |
| 2 | 4-1/2 | 3-5/8 | 5.4 | 20.5 |
| 3 | 5-1/2 | 5 | 12.0 | 40.0 |
| 4 | 6-1/2 | 6-3/16 | 17.0 | 67.0 |
| 6 | 8 | 8-1/2 | 29.3 | 120.0 |
| 8 | 9 | 10-5/8 | 45.6 | 180.0 |
| Dimensional Data | Compare Weights | |||||
| Size | A (in) | B (in) | C(in) | D(in) | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1 × 1 | 2-5/8 | 2 | 2 | 3-1/2 | 1.4 | 3.7 |
| 1-1/2 × 1 | 3-3/8 | 2-7/8 | 2 | 4 | 1.8 | 5.1 |
| 2 × 1 | 4-1/8 | 3-5/8 | 2 | 4-1/2 | 2.3 | 6.6 |
| 3 × 1 | 5-3/8 | 5 | 2 | 5-1/2 | 3.1 | 9.2 |
| 4 × 1 | 6-7/8 | 6-3/16 | 2 | 6-1/2 | 4.2 | 13.3 |
| 6 × 1 | 8-3/4 | 8-1/2 | 2 | 8-1/16 | 5.4 | 17.4 |
| 8 × 1 | 11 | 10-5/8 | 2 | 9 | 7.2 | 27.6 |
| Dimensional Data | Compare Weights | ||||
| Size | A (in) | B (in) | C(in) | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1-1/2 × 1 | 4-1/2 | 2-7/8 | 2 | 1.7 | 6.7 |
| 2 × 1 | 5 | 3-5/8 | 2 | 2.3 | 8.9 |
| 2 × 1-1/2 | 5 | 3-5/8 | 2-7/8 | 2.7 | 10.4 |
| 3 × 1 | 6 | 5 | 2 | 3.5 | 13.5 |
| 3 × 1-1/2 | 6 | 5 | 2-7/8 | 4.0 | 15.3 |
| 3 × 2 | 6 | 5 | 3-5/8 | 4.6 | 17.7 |
| 4 × 1 | 7 | 6-3/16 | 2 | 5.3 | 20.4 |
| 4 × 1-1/2 | 7 | 6-3/16 | 2-7/8 | 5.8 | 22.3 |
| 4 × 2 | 7 | 6-3/16 | 3-5/8 | 6.4 | 24.6 |
| 4 × 3 | 7 | 6-3/16 | 5 | 7.5 | 29.0 |
| 6 × 2 | 9 | 8-1/2 | 3-5/8 | 10.5 | 40.3 |
| 6 × 3 | 9 | 8-1/2 | 5 | 11.6 | 44.5 |
| 6 × 4 | 9 | 8-1/2 | 6-3/16 | 13.4 | 51.5 |
| 8 × 4 | 11 | 10-5/8 | 6-3/16 | 20.0 | 75.5 |
| 8 × 6 | 11 | 10-5/8 | 8-1/2 | 23.1 | 84.0 |
| Dimensional Data | C Holes | D Holes | Compare Weights | |||||||||||
| Size | A (in) | B (in) | E (in) | H (in) | # Holes | Dia. | B.C. | #Holes | Thread | B.C. | Depth | Y° | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1-1/2 × 1 | 5 | 1-9/16 | 2-7/8 | 2 | 4 | 5/8 | 3-7/8 | 4 | 1/2-13 | 3-1/8 | 1 | 45 | 1.2 | 4.3 |
| 2 × 1 | 6 | 1-9/16 | 3-5/8 | 2 | 4 | 3/4 | 4-3/4 | 4 | 1/2-13 | 3-1/8 | 1 | 45 | 1.8 | 6.0 |
| 2 × 1-1/2 | 6 | 1-9/16 | 3-5/8 | 2-7/8 | 4 | 3/4 | 4-3/4 | 4 | 1/2-13 | 3-7/8 | 1 | 45 | 1.8 | 6.3 |
| 3 × 1 | 7-1/2 | 1-5/8 | 5 | 2 | 4 | 3/4 | 6 | 4 | 1/2-13 | 3-1/8 | 3/4 | 45 | 3.0 | 11.5 |
| 3 × 1-1/2 | 7-1/2 | 1-5/8 | 5 | 2-7/8 | 4 | 3/4 | 6 | 4 | 1/2-13 | 3-7/8 | 1 | 45 | 3.0 | 12.8 |
| 3 × 2 | 7-1/2 | 1-3/4 | 5 | 3-5/8 | 4 | 3/4 | 6 | 4 | 5/8-11 | 4-3/4 | 1-1/4 | 45 | 3.4 | 12.5 |
| 4 × 1 | 9 | 1-7/8 | 6-3/16 | 2 | 8 | 3/4 | 7-1/2 | 4 | 1/2-13 | 3-1/8 | 3/4 | None | 4.7 | 15.8 |
| 4 × 1-1/2 | 9 | 1-7/8 | 6-3/16 | 2-7/8 | 8 | 3/4 | 7-1/2 | 4 | 1/2-13 | 3-7/8 | 3/4 | None | 3.9 | 15.5 |
| 4 × 2 | 9 | 2 | 6-3/16 | 3-5/8 | 8 | 3/4 | 7-1/2 | 4 | 5/8-11 | 4-3/4 | 15/16 | None | 5.5 | 14.5 |
| 4 × 3 | 9 | 1-3/4 | 6-3/16 | 5 | 8 | 3/4 | 7-1/2 | 4 | 5/8-11 | 6 | 15/16 | None | 4.4 | 14.5 |
| 6 × 1-1/2 | 11 | 2-1/4 | 8-1/2 | 2-7/8 | 8 | 7/8 | 9-1/2 | 4 | 1/2-13 | 3-7/8 | 3/4 | None | 6.2 | 24.5 |
| 6 × 2 | 11 | 2-3/8 | 8-1/2 | 3-5/8 | 8 | 7/8 | 9-1/2 | 4 | 5/8-11 | 4-3/4 | 15/16 | None | 6.4 | 24.3 |
| 6 × 3 | 11 | 2-1/8 | 8-1/2 | 5 | 8 | 7/8 | 9-1/2 | 4 | 5/8-11 | 6 | 15/16 | None | 6.5 | 22.3 |
| 6 × 4 | 11 | 2-1/8 | 8-1/2 | 6-3/16 | 8 | 7/8 | 9-1/2 | 8 | 5/8-11 | 7-1/2 | 15/16 | 22.5 | 8.3 | 22.0 |
| 8 × 4 | 13-1/2 | 2-1/4 | 10-5/8 | 6-3/16 | 8 | 7/8 | 11-3/4 | 8 | 5/8-11 | 7-1/2 | 15/16 | 22.5 | 11.8 | 39.5 |
| 8 × 6 | 13-1/2 | 2-1/2 | 10-5/8 | 8-1/2 | 8 | 7/8 | 11-3/4 | 8 | 3/4-10 | 9-1/2 | 1-1/8 | 22.5 | 10.8 | 36.3 |
| Dimensional Data | Compare Weights | ||||
| Size | A (in) | B (in) | C(in) | Durcor Weight (lbs) |
Alloy Fitting Weight (lbs) |
| 1 | 4.25 | 0.79 | 2.00 | 0.7 | 2.2 |
| 1-1/2 | 5.00 | 0.86 | 2.88 | 1.1 | 3.3 |
| 2 | 6.00 | 0.96 | 3.63 | 1.7 | 4.8 |
| 3 | 7.50 | 1.16 | 5.00 | 3.3 | 9.9 |
| 4 | 9.00 | 1.16 | 6.18 | 4.7 | 12.8 |
| 6 | 11.00 | 1.26 | 8.50 | 7.7 | 28.5 |
| 8 | 13.50 | 1.37 | 10.63 | 12.6 | 47.0 |
Insulation and Heat Tracing
Insulation and heat tracing are not only used to prevent freezing of the process fluid, but can also be used to minimize energy losses and reduce viscosity. The thermal conductivity for Durcor is extremely low, especially when compared to steel lined pipe.
Analysis of this feature can often eliminate the need for tracing and/or reduce the thickness of insulation required to maintain a given temperature. On long tracing runs, Durcor flanged Flexijoints should be provided to compensate for any pipe expansion or contraction.
All typical heat tracing methods may be applied to Durcor pipe and fittings. Consultation with tracing manufacturers is highly recommended.
- Hot water:Typically, the most economical. However, heat transfer cement should be installed for better heat transfer according to cement manufacturers' recommendations.
- Electrical Tracing:Tracing Durcor pipe can be accomplished successfully with electrical cable and sensors to ensure against localized overheating. Specifying a T-Rating that will not allow electrical cable to go above the 250°F is also another option.
- Steam Tracing:Steam pressure must be controlled so that the temperature does not exceed the maximum temperature of 250°F. An isolated (insulated) steam tracer should be used to avoid localized overheating.
| Max Temp | Type of Tracing |
| 250°F | Hot water Electric Steam |
Durcor® pipe and fittings should never exceed maximum temperature of 250°F when insulated.
Engineered Structural Composite Enhancements
Durcor flanges can be used as a component in expansion joints, hoses, and sight indicators.
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