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75 Parker Hannifin Corporation
Instrumentation Products Division
Huntsville, AL USA
http://www.parker.com/ipdus
Instrument Tubing Selection Guide
Parker’s instrument tube fittings have been designed to work in a wide variety of applications that demand the utmost in
product performance.
Although Parker’s Instrument tube fittings have been engineered and manufactured to consistently provide this level of
reliability, no systems in-tegrity is complete without considering the critical link, tubing.
This booklet is intended to assist the designer to properly select and order quality tubing.
Proper tube selection and installation, we believe, are key ingredients in building leak-free reliable tubing systems.
General Selection Criteria
The most important consideration in the selection of suitable tubing for any application is the compatibility of the tubing mate-
rial with the media to be contained. Table 1 lists common materials and their associated general application. Table 1 also lists
the maximum and minimum operating temperature for the various tubing materials.
In addition, Parker instrument fittings are designed to work on like materials. Stainless steel fittings should be used only with
stainless steel tubing, aluminum fittings with aluminum tubing, etc. The practice of mixing materials is strongly discouraged.
The only exception is brass fittings with copper tubing.
Dissimilar materials in contact may be susceptible to galvanic corrosion. Further, different materials have different levels of
hardness, and can adversely affect the fittings ability to seal on the tubing.
TUBING RECOMMENDED
MATERIAL GENERAL APPLICATION TEMPERATURE RANGE
Stainless Steel High Pressure, High Temperature, Generally -425°F to 1,200°F1
Corrosive Media (-255°C to 605°C)
Carbon Steel High Pressure, High Temperature Oil, Air, -20°F to 800°F2
Some Specialty Chemicals (-29°C to 425°C)
Cooper Low Temperature, Low Pressure Water, -40°F to 400°F
Oil, Air (-40°C to 205°C)
Aluminum Low Temperature, Low Pressure Water, Oil, Air, -40°F to 400°F
Some Specialty Chemicals (-40°C to 205°C)
Monel 400 ™ Recommended for Sour Gas Applications -325°F to 800°F
Well Suited for Marine and General Chemical (-198°C to 425°C)
Processing Applications
Alloy C276 Excellent Corrosion Resistance to Both Oxidizing -325°F to 1000°F
and Reducing Media and Excellent Resistance to (-198°C to 535°C)
Localized Corrosion Attack
Carpenter 20 ™ Applications Requiring Resistance to Stress -325°F to 800°F
Corrosion Cracking in Extreme Conditions (-198°C to 425°C)
Alloy 600 Recommended for High Temperature -205°F to 1200°F
Applications with Generally Corrosive Media (-130°C to 650°C)
Titanium Resistant to Many Natural Environments such as -75°F to 600°F
Sea Water, Body Fluids and Salt Solutions (-59°C to 315°C)
Carpenter 20 is a trademark of Carpenter Technology Corporation. Monel 400 is a trademark of International Nickel.
1. For operating temperatures above 800 °F (425 °C), consideration should be given to media. 300 Series Stainless Steels are suspectible to carbide
precipitation which may lead to intergranular corrosion at elevated temperatures.
2. Consideration should be given to maximum temperature ratings if fittings and/or tubing are coated or plated.
All temperature ratings based on temperatures per ASME/ANSI B31-3 Chemical Plant and Petroleum Refinery Piping Code, 1999 Edition.
The information listed in Table 1 is general in scope. For specific applications, please contact Parker’s Instrumentation Products Division, Product
Engineering Department (256) 881-2040.
D30003 75 5/12/05