06-PPFA v2.3 Selecting
Transcript of 06-PPFA v2.3 Selecting
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2003, 2004, 2005 - Plastics Pipe and Fittings Association
Selecting the Proper
Plastic Piping Material
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Selecting the ProperPlastic Piping Material
To select the proper plastic piping material,
conditions of service for the liquid to be handled andthe suitability of the materials for those serviceconditions must be known. Listed is a summary andexample of selecting the proper plastic pipingmaterial.
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Service Conditions Check List
Type Application
Type Fluid(s)
Working Pressure (min/max)
Working Temperature (min/max)
Velocity (max)
Specific Gravity
Viscosity
Particulates
Piping Size Range
Above- or Below-ground Installation
Interior/Exterior Exposure
Specific Code Agencies/Approvals
Fluid-handling Products In Fluid Contact
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TIPS Material Selection
Chemical Compatibility
Pressure/Temperature Compatibility
Piping Size and Product Availability
Piping System Joining Method
Price Comparability
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Example Service Conditions
Service Conditions
Application: Metal Ore Smeltering
Fluid: Sulfuric Acid, 70% concentration
Working Pressure: 50-105 psi
Working Temperature: 70-130F
Velocity: Less than 3 ft/sec
Specific Gravity: 1.57
Viscosity: 60 ssu
Particulates: minimal
Piping Sizes: - 6
Installation: Above ground
Exposure: Interior
Code Agencies: Standard
Required Fluid-handlingEquipment:
Pipe / Fitting / Valve / Pump
* Conditions depicted in bold are major selection criteria for thisapplication.
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Example Chemical Compatibility
Partial Chemical Resistance Chart
Chemical PVC CPVC PP PVDF PE
Temperature (F) 70 140 70 140 185 70 150 180 70 150 250 70 140
Sulfuric acid, 50% R R R R R R R NR R R R R
Sulfuric acid, 60% R R R R R R R NR R R R R
Sulfuric acid, 70% R R R R R R NR NR R R R R
Sulfuric acid, 80% R R R R R R NR NR R R R NR
Sulfuric acid, 90% R NR R R R R NR NR R R R NRSulfuric acid, 93% R NR R R NR R NR NR R R R NR
Sulfuric acid, 100% NR NR NR NR NR NR NR NR NR NR NR NR
R = Recommended = No information available NR = Not Recommended
Service Conditions
Fluid: Sulfuric Acid, 70% concentration
Working Temperature: 70-130F
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Maximum Operating Pressure Ratings(psi) of Schedule 80 Piping / Fittings @ 73F
Nom. Pipe Size (in.) PVC / CPVC PE (SDR 11) PP PVDF
3 370 160 190 250
4 320 160 160 220
6 280 160 140 190
Example Pressure Compatibility
Service Conditions
Working Pressure: 50-105 psi
Working Temperature: 70-130F
Piping Sizes: - 6
Temperature Correction Factor for PipingTemp. (F) CPVC PE PP PVC PVDF
110 .77 .74 .80 .50 .75
120 .70 .63 .75 .40 .68
130 .62 .57 .68 .30 .62
CPVC0.62(280) = 174 psi
PVC0.30(280) = 84 psi(system max. is 105 psi)
PVDF0.62(190) = 118 psi
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Example Joining System
Results of Previous Tests
CPVC PE PP PVC PVDF
ChemicalCompatibility
Pressure/Temp.Compatibility 23 3
3 3 322
Product Availability
CPVC PVDF
Joining System
CPVC = Solvent Cementing
PVDF = Heat Fusion
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Example Cost Comparison
Estimates of 100-ft, 6-in Pipelines for Various Materials*
Materials Piping Costs ($) Ratio CS
PVC Sch. 80 11,499 0.50
CPVC Sch. 80 18,932 0.83
Carbon Steel Sch. 40 22,789 1.00
St. Steel 304L Sch. 40 45,835 2.01
Aluminum alloy 303 Sch. 40 48,134 2.11
St. Steel 316L Sch. 40 49,355 2.17
Copper 50,473 2.21
PVDF Sch. 80 63,945 2.81
Titanium Sch. 40 132,804 6.11
Alloy 200 Sch. 40 150,188 6.59
Zirconium Sch. 40 159,382 6.99
* Adapted from Chemical Processing, June 1999
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Example Results
Results of Previous Tests
CPVC PE PP PVC PVDF
ChemicalCompatibility
Pressure/Temp.Compatibility
CostComparison
Selected Material
CPVC
23 33 3 322
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Example Addendum
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If sulfuric acid concentration were 93%, only PVDFwould be selected
If sulfuric acid concentration were 60% and themaximum temperature were 120F, both CPVC andPP would be considered
If maximum temperature did not exceed 110F, both
PE and PVC would be considered
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TIPS are...
Environmentally sound
Easy and safe to install Reliable
Long-lasting
Cost-effective