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U16
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
4300 Catalog
General Technical
Dimensions and pressures for reference only, subject to change.
1. Selecting Tube Materia
ndicates that carbon
steel, C-1010, tubing would meet the media, operating
temperature range, andmaximumoperatingpressure (high)
requirements.
2. Sizing the Tube:
Fro
the recommended flow
diameters for various lines for 10 GPM flow rate are: 0.405
for pressure line, 0.639 for return line, and 1.012 for suction
line.
Now, using
nd
e need to find tubes with
inside diameters (I.D.) equal to or larger than the above flow
diameters, andwall thicknessesappropriate for designpres-
sures of 3500 psi minimum for the pressure line and about
500 psi for return and suction lines. Since derating factors
for Severity of Service (Table U10) and Max. Operating
Temperature (TableU11) areboth1, designpressure values
in
and
o not need to be reduced.
Matching tube I.D.s and design pressures in
and
or above conditions, we find:
A) For thepressure line, wewould choose5/8”O.D.x .083”
wall tubing. The .095” and .109” wall tubes would also
be satisfactory if .083” wall is not readily available.
B) For the return line, either 3/4” x .035” or 3/4” x .049”
would meet the requirements. If Ferulok fittings are
being used, we will need to go to 3/4” x .065” because
.065” is the smallest wall thickness recommended for
3/4” O.D. tubing used with Ferulok fittings in
his reduces the flow diameter about 3% below
the recommended value, but is still in the acceptable
range. The alternative is to go to 7/8” O.D. x .072” wall
tubing, which is way too large.
The design factor is generally applied to ultimate strength of
material (or burst pressure of tubing) to provide a measure of
safety against the unknowns in material and operating condi-
tions.The derating factors listed here should be applied directly
to the design pressure values i
an
to arrive at
maximumrecommendedworkingpressures (i.e.,multiply values
in
n
by these derating factors).
Besides severity of service, high operating temperature also
reduces allowable working pressure of the tubing. Temperature
derating factors for various tubematerials are given inTableU11.
Where applicable, derating factors for severity of service and
temperature should be applied to the design pressure values in
an
o arrive at the maximum recommended
working pressure.
Example:
Combined derating factor for 316SS tubing for B (severe)
service and 500° F. operation is .67 x .9 = .603
Tube Selection Example:
To select tube material and tube sizes for pressure, return and
suction lines for a hydraulic power unit with the following operat-
ing parameters known:
Type of fluid: Petroleum base hydraulic fluid
Operating temperature range: -20°F to +140°F.
Maximum operating pressure: 3500 psi
Maximum flow rate through each line: 10 GPM
Severity of service: A (normal)
Table U10 — Severity of Service Design and Derating Factors
Table U11 —Temperature Derating Factors* for Tubes
* The derating factors are based on allowable design stress
values at various temperatures per ASME B31.1 code for
pressure piping (1986).
1) Brazing to attach sleeve can be used for all wall thicknesses. For
flanging tool availability, se
Table U12 — Recommended “Min./Max”Tube Wall Thickness for
Common Fittings
C) For the suction line, we can use any one of the fol-
lowing tubes: 1-1/4” O.D. x .049” to .083” wall tube for
Triple-Lok or Seal-Lok fittings and 1-1/4” O.D. x .095”
wall tube for Ferulok fittings.
One final consideration in choosing the right wall
thickness for tubing is bending. If bending without
the use of a mandrel is desired, then wall thickness
of less than 7% of tube O.D. should not be used.
Tube Material
Steel
St. Steel
Copper
Aluminum
Steel
St. Steel
Monel
Steel
Alloy Steel
St. Steel
Copper
Monel
Copper
Aluminum
Plastics
Steel
St. Steel
Size
O.D.
(in.)
O.D.
(mm)
Dash
Number
SAE
37° Flare
Triple-Lok
SAE
Flareless
Ferulok
SAE O-ring
Face Seal
Seal-Lok
1)
Intru-Lok
Metric
Flareless
1/8 4 -2 .010 - .035 .010 - .035 — .012 - .028 0.5 - 1
3/16 6 -3 .010 - .035 .020 - .049 — .012 - .035 1 - 2
1/4 8 -4 .020 - .065 .028 - .065 .020 - .083 .020 - .049 1 - 2.5
5/16 10 -5 .020 - .065 .028 - .065 .020 - .095 .020 - .065 1 - 3
3/8 12 -6 .020 - .065 .035 - .095 .020 - .109 .028 - .065 1.5 - 3.5
1/2 14 -8 .028 - .083 .049 - .120 .028 - .148 .035 - .083 1.5 - 4
5/8 15 -10 .035 - .095 .058 - .120 .035 - .134 .035 - .083 1.5 - 4
3/4 16 -12 .035 - .109 .065 - .120 .035 - .148 .035 - .095 2 - 4
7/8 18 -14 .035 - .109 .072 - .120 — .049 - .095 2 - 4
1 20 -16 .035 - .120 .083 - .148 .035 - .188 .049 - .120 2.5 - 4
1 1/4 22 -20 .049 - .120 .095 - .188 .049 - .220
2.5 - 4
1 1/2 25 -24 .049 - .120 .095 - .220 .049 - .250
2.5 - 4.5
2 28 -32 .058 - .134 .095 - .220 .065 - .220
2.5 - 4.5
30
2.5 - 5
35
3 - 5
38
3 - 6
42
3.5 - 7
Severity of
Service
Description
Design
Factor
Derating
Factor
A (Normal)
Moderate mechanical and
hydraulic shocks.
4.00
1.00
B (Severe)
Severe hydraulic shocks
and mechanical strain.
6.00
0.67
C (Hazardous)
Hazardous application with
severe service conditions.
8.00
0.50
Maximum
Operating
Temperature
(degrees F)
Steel
C-1010
and
C-4130
Stainless
Steel
Copper
Aluminum
6061-T6
Monel
Type 400
304 316
100
1.00 1.00 1.00 1.00
1.00
1.00
150
1.00 0.91 1.00 0.85
1.00
0.97
200
1.00 0.84 1.00 0.80
1.00
0.94
250
1.00 0.79 1.00 0.80
0.94
0.91
300
1.00 0.75 1.00 0.78
0.80
0.88
350
0.99 0.72 0.99 0.67
0.60
0.86
400
0.98 0.69 0.97 0.50
0.43
0.85
500
0.96 0.65 0.90
0.84
600
0.61 0.85
0.84
700
0.59 0.82
0.84
800
0.57 0.80
0.83
900
0.54 0.78
1000
0.52 0.77
1100
0.47 0.62
1200
0.32 0.37
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