Durcor^® Design & Specification

Overview

Materials & Construction

All Durcor pipe is manufactured with glass fibers and a premium grade vinyl ester resin in an automated manufacturing process developed by PureFlex for composite pressure piping. Interior heavy wall virgin PTFE pipe liner provides maximum chemical resistance.

Pipe Construction

1. Minimum of (3) resin-rich surface veils of a minimum 20 mils to form the inner surface of the Durcor pipe.
2. Dense bundles of glass rovings are applied in both the axial and radial directions to provide the mechanical properties of Durcor pipe.
3. A protective heavy layer of chopped strand mat is applied over the glass rovings.
4. Two final layers of resin-rich surfacing veil for UV protection.
5. Fittings shall be molded in dedicated resin transfer tooling.

Applicable Documents

ASTM F1545 “Plastic-Lined Ferrous Metal Pipe, Fittings, and Flanges”

ASTM D4894 “Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials”

ASTM D4895 “Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion”

ASTM D1599 “Resistance To Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings”
This Standard defines the procedure to determine burst pressures of pipe, tubing, and fittings. The resultant burst pressure then provides an ultimate hoop stress value based on product dimensions. Durcor pipe and fittings have been tested for short term burst pressure and the ultimate hoop stress determined. Recommended working pressures for Durcor piping are one-fourth of the ultimate stress values obtained.

ASTM D5685 “Fiberglass (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe Fittings”

ASTM D4024 “Machine Made “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Flanges”

Drop Impact Testing

Following the test procedures of the falling weight impact testing per ASTM D2444 “Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling Weight)”, results showed that Durcor pipe can withstand a room temperature drop impact energy of up to 72 ft-lb without failure. Additionally, the impact resistance increased with decreasing temperatures when Durcor pipe was saturated to (-40°F); the drop impact resistance improved to over 80 ft-lb.

Average Typical Properties
	Beam bending design stress is 1/8 of ultimate to allow for combined stress (bending and pressure)
Typical Physical Properties	75°F	250°F	Typical FRP @ 75°F	Method
Axial Tensile Strength	48,000 psi	31,200 psi	11,600 psi	ASTM D2105
Axial Tensile Design Strength	12,000 psi	7,800 psi	3,870 psi	ASTM D2105
Axial Modulus of Elasticity	2.76 × 106 psi	1.70 × 106 psi	1.60 × 106 psi	ASTM D2105
Axial Compression Strength	50,750 psi	34,075 psi	14,500 psi	ASTM D695
Axial Compression Design Strength	12,690 psi	8,520 psi		ASTM D695
Compression Modulus	2.39 × 106 psi	1.47 × 106 psi		ASTM D695
Beam Bending Ultimate Stress	47,100 psi	35,300 psi	12,380 psi	ASTM D2925
Beam Bending Design Stress	5,900 psi	4,410 psi	4,410 psi	ASTM D2925
Poisson's Ratio	0.32		0.65
Flexural Modulus of Elasticity	3.26 × 106 psi	1.89 × 106 psi	1.81 × 106 psi	ASTM D790
Coefficient of Linear Thermal Expansion	4.5 × 10-6 in/in/°F		10 × 10-6 in/in/°F
Specific Gravity	1.92 (housing) and 2.15 (PTFE)		1.80
Heat Deflection Temperature	266 °F
Hazen-Williams Flow Coefficient	155		150
Thermal Conductivity	0.22 BTU-in/hr-ft2_oF

PTFE Physical Properties
Property	ASTM Method	Unit	Value
Tensile Strength	D638	PSI	3,000
Ultimate Elongation	D638	%	250
Flexural Modulus	D790	psi	70,000
Hardness	D2240	Shore D	55
Thermal Conductivity	E1530	BTU-in/hr-ft2_oF	0.14
Dielectric Strength	D149	V/mil	600
Water Absorption	D570	%	<0.01
Static Coefficient of Friction			0.05
Specific Gravity			2.14 – 2.19