ASTM F1387 Testing of Mechanically Attached Fittings
Evans Presslok® Fittings Sizes 3” and 4”
September 21, 2016
Final REPORT
ECI-PL-TR1
TABLE OF CONTENTS
1.0 .......OBJECTIVE .........................................................................................................................1
2.0 .......EXPERIMENTAL APPROACH ........................................................................................ .1
2.1 Pneumatic Proof ......................................................................................................................... .2
2.2 Helium Leak Check ............................................................................................................. ……3
2.3 Hydrostatic Proof ..........................................................................................................................4
2.4 Hydrostatic Burst ......................................................................................................................... 5
3.0 .......RESULTS AND DISCUSSION ............................................................................................6
3.1 Pneumatic Proof Test ................................................................................................................... 6
3.2 Helium Leak Check Test .............................................................................................................. 7
3.3 Hydrostatic Proof Test ..............................................................................................................….8
3.4 Hydrostatic Burst Test .....................................................................................................………..9
4.0 .......SUMMARY OF THE RESULTS......................................................................................9-10
i
LIST OF FIGURES
Page
Figure 1: Schematic of the Evans Presslok® system ........................................................................ 1
Figure 2: Picture of 3.0 in diameter specimens prior to the testing ................. .…………………...2
Figure 3: Picture of the setup used for the pneumatic proof test ..................................................... 3
Figure 4: Picture of the setup used for the helium leak check test .................................................. 3
Figure 5: Picture of the setup used for the hydrostatic proof test .................................................. . 4
Figure 6: Picture of the setup used for the hydrostatic proof test ………………............................ 5
ii
LIST OF TABLES
Page
Table 1: Results of the pneumatic proof tests of the 3.0-in diameter specimens ............................ 6
Table 2: Results of the pneumatic proof tests of the 4.0-in diameter specimens............................ .6
Table 3: Results of the helium leak check tests of the 3.0-in diameter specimens ......................... 7
Table 4: Results of the helium leak check tests of the 4.0-in diameter specimens ....................... ..7
Table 5: Results of the hydrostatic proof tests of the 3.0-in diameter specimens ........................ ...8
Table 6: Results of the hydrostatic proof tests of the 4.0-in diameter specimens ...... …………….8
Table 7: Results of the hydrostatic burst tests conducted on the 3.0-in diameter specimens ...........9
Table 8: Results of the hydrostatic burst tests conducted on the 4.0-in diameter specimens ......... .9
Table 9: Summary of the tests conducted on the 3.0-in diameter specimens ...........……………..9
Table 10: Summary of the tests conducted on the 4.0-in diameter specimens ...........…….……...10
iii
1.0 OBJECTIVE
This study was conducted to test the performance of the Evans PL Series Presslok® system made of 316/304 stain-
less steel permanent tube fittings, following most guidelines of ASTM F1387 (2012) standard. The Evans Press-
lok® stainless steel fittings are designed specifically to join plain end stainless steel tube systems weld free.
2.0 EXPERIMENTAL APPROACH
A schematic of the Evans Presslok® system is schematically shown in Figure 1. The system consists of a pre-
lubricated O-ring seal that compresses against the tube outer diameter and the 316/304 stainless steel inner hous-
ing. The housing incorporates the gasket and a tube stop; the latter helps position the tube. The entire system is
assembled with the Evans PLT tool jaws.
Figure 1: Schematic of the Evans Presslok® system
Permanently attached Presslok® fittings were tested using specimens of the same type, grade, and class (316/304
stainless steel). The fully assembled specimens were provided by Evans. The Presslok® fittings and tubing diame-
ters were 3.0 in and 4.0 in. The nominal cross sections of the tubes were 0.065 in for 3.0 in tube diameter and
0.083 in for the 4.0 in tube diameters. Each specimen was assigned a number for traceability.
The specimens used for the tensile test consisted of two 10 inch stainless steel tubes joined by a Presslok® cou-
pling located in the center of the specimen. At each tube end, a NPT threaded fitting was attached which allowed
connecting the specimen to the tensile frame.
1
The overall specimen length was 25 in. For the rest of the tests, each specimen consisted of two 5-6 in long
stainless steel tubes separated by a centrally positioned stainless steel Presslok® coupling. Each end of these
specimens had a weld cap with a 1/4” tube stub by 1/4” compression fitting welded into the weld cap. The
length of these specimens was 17” long for the 3.0 in specimens and 22” long for the 4.0 in specimens.in
(see Figure 2).
Unless otherwise specified, ambient conditions were maintained at 75±5 ºF and test pressure maintained at ±2%
of the target value, unless otherwise noted. Allowable test temperature applied to test specimen during testing
was ±2 ºF, unless otherwise noted. Test fluids used to pressurize the specimens was water unless otherwise noted.
The rated pressures of the Presslok® coupling are 200 psi for the 3.0 in and 4.0 in diameter.
The test program included the following standard tests according to ASTM F1387 standard test (2012): pneumat-
ic proof, hydrostatic proof, and hydrostatic burst. An additional helium leach check test was performed, as well.
The tests described were conducted per ASTM F1387 standard procedure (Standard Specification for Perfor-
mance of Piping and Tubing Mechanically Attached Fittings). Hydrostatic burst pressure testing was done at
2.5X maximum for the 3.0 ” and 4.0”
2.1 Pneumatic Proof
Figure 3 shows a typical picture of the test setup used for the pneumatic test of each specimen size. The speci-
mens were individually attached to the test fixture and tested one at a time. A high-pressure nitrogen storage tank
provided the required pressure within the test specimens.
The nitrogen flow was directed to the specimen by way of 0.25-in. high pressure tubing. The tank and tubing
were provided with a pressure regulator, valve, and pressure gauge to control and monitor the pressure in the
specimen. The specimens were pressurized to 100 psig for 5 min. If a detectable leakage occurred, the faulty
specimen/s was identified, retightened, and the test resumed.
Figure 2: Picture of 3.0 in diameter specimens prior to the testing
2
The pressure, measured by a pressure gauge was continually monitored throughout the test. The specimens pass
the pneumatic test if there are no detectable leaks or drop in pressure throughout the test.
Figure 3: Picture of the setup used for the pneumatic proof test
2.2 Helium Leak Check
After passing the pneumatic proof test, the specimens were subjected to the helium leak check test .Figure 4
shows a typical picture of the test setup used for the helium leak check test of each specimen size. Each speci-
men was individually attached to the leak detector (Inficon Model 1000). A vacuum was drawn on the speci-
men and a steady spray of helium gas was applied around each of the pressed joints. If the reading on the digi-
tal display did not change, the results were documented and the specimen passed the test.
Figure 4: Picture of the setup used for the helium leak check test
3
2.3 Hydrostatic Proof
After passing the helium leak check test, the specimens were subjected to the hydrostatic proof test. The speci-
mens were filled with tap water and pressurized to 100 psig for 5 min, using high pressure regulator, valve
and Nitrogen gas cylinder. If no leakage was noted, the pressure was gradually increased to 150% of the rated
pressure (3.0 in and 4.0 in = 300 psi). The pressurized fittings were then continually observed for signs of
leakage including, spray, mist, or water droplets. The pressure, measured by a pressure gauge was continually
monitored throughout the test. A clean, dry, collection bucket was placed below the fitting to measure any
leakage that may occur. The specimens pass the hydrostatic test if there are no detectable leaks or drop in
pressure throughout the test.
Figure 5: Picture of the setup used for the hydrostatic proof test
4
Figure 6: Picture of the setup used for the hydrostatic burst test
2.4 Hydrostatic Burst
This test demonstrates the reliability of the specimens when exposed to hydrostatic overpressure. This test
was conducted on four (4) specimens of each size that passed the hydrostatic proof , helium leak check and
pneumatic proof tests. The specimens were filled with tap water. The pressure was gradually increased to
(2.5) times the rated pressure to attain 500 psi for the 3.0 in and 4.0 in diameter at a rate not exceeding 100
psi/min and held for about 1 min. The specimens pass the hydrostatic burst test when (2.5) times 3.0” and
4.0” rated pressure had been attained without leaks or burst.
5
Specimen # Target
Pressure
Test Time Result
(PSI)
1 100 psi 5 min. 100
2 100 psi 5 min. 100
3 100 psi 5 min. 100
4 100 psi 5 min. 100
5 100 psi 5 min. 100
6 100 psi 5 min. 100
7 100 psi 5 min. 100
8 100 psi 5 min. 100
9 100 psi 5 min. 100
10 100 psi 5 min. 100
11 100 psi 5 min. 100
12 100 psi 5 min. 100
13 100 psi 5 min. 100
14 100 psi 5 min. 100
15 100 psi 5 min. 100
16 100 psi 5 min. 100
17 100 psi 5 min. 100
18 100 psi 5 min. 100
19 100 psi 5 min. 100
20 100 psi 5 min. 100
21 100 psi 5 min. 100
22 100 psi 5 min. 100
Specimen # Target Test Time Result
1 100 psi 5 min. 100
2 100 psi 5 min. 100
3 100 psi 5 min. 100
4 100 psi 5 min. 100
5 100 psi 5 min. 100
6 100 psi 5 min. 100
7 100 psi 5 min. 100
8 100 psi 5 min. 100
9 100 psi 5 min. 100
10 100 psi 5 min. 100
11 100 psi 5 min. 100
12 100 psi 5 min. 100
13 100 psi 5 min. 100
14 100 psi 5 min. 100
15 100 psi 5 min. 100
16 100 psi 5 min. 100
17 100 psi 5 min. 100
18 100 psi 5 min. 100
19 100 psi 5 min. 100
20 100 psi 5 min. 100
21 100 psi 5 min. 100
22 100 psi 5 min. 100
3.0 RESULTS AND DISCUSSION
The results reported next are of representative specimens.
3.1 Pneumatic Proof Tests
Table 1: Results of the pneumatic proof
tests of the 3.0-in specimens
Table 2: Results of the pneumatic proof
tests of the 4.0-in specimens
6
The results of the pneumatic proof tests are shown in Table 1 and Table 2. The internal pressure was main-
tained at a minimum of 100 psi for the 3.0 in and 4.0 in diameter specimens. The pneumatic proof tests did
not reveal failure for all the specimens tested.
7
Specimen # Target Leak Rate
(scc/sec)
Result
(scc/sec)
1 1 x 10-7 3.8 x 10-9
2 1 x 10-7 1.5 x 10-8
3 1 x 10-7 9.0 x 10-9
4 1 x 10-7 1.0 x 10-8
5 1 x 10-7 1.5 x 10-8
6 1 x 10-7 1.1 x 10-8
7 1 x 10-7 1.7 x 10-8
8 1 x 10-7 1.5 x 10-8
9 1 x 10-7 1.4 x 10-8
10 1 x 10-7 1.3 x 10-8
11 1 x 10-7 1.4 x 10-8
12 1 x 10-7 8.5 x 10-9
13 1 x 10-7 1.3 x 10-8
14 1 x 10-7 1.7 x 10-8
15 1 x 10-7 1.7 x 10-8
16 1 x 10-7 1.4 x 10-8
17 1 x 10-7 1.7 x 10-8
18 1 x 10-7 1.7 x 10-8
19 1 x 10-7 1.6 x 10-8
20 1 x 10-7 1.5 x 10-8
21 1 x 10-7 3.9 x 10-9
22 1 x 10-7 6.8 x 10-9
Table 3: Results of the helium leak check
tests of the 3.0-in specimens
3.2 Helium Leak Check Tests
Specimen # Target Leak Rate
(scc/sec)
Result
(scc/sec)
1 1 x 10-7 4.2 x 10-10
2 1 x 10-7 4.3 x 10-10
3 1 x 10-7 2.7 x 10-9
4 1 x 10-7 6.3 x 10-10
5 1 x 10-7 7.8 x 10-10
6 1 x 10-7 4.2 x 10-9
7 1 x 10-7 4.4 x 10-9
8 1 x 10-7 3.4 x 10-9
9 1 x 10-7 5.1 x 10-9
10 1 x 10-7 3.0 x 10-9
11 1 x 10-7 1.0 x 10-9
12 1 x 10-7 7.7 x 10-9
13 1 x 10-7 1.9 x 10-9
14 1 x 10-7 7.9 x 10-9
15 1 x 10-7 7.5 x 10-9
16 1 x 10-7 2.5 x 10-9
17 1 x 10-7 7.1 x 10-9
18 1 x 10-7 1.5 x 10-9
19 1 x 10-7 7.8 x 10-10
20 1 x 10-7 3.3 x 10-9
21 1 x 10-7 1.2 x 10-9
22 1 x 10-7 4.8 x 10-10
Table 4: Results of the helium leak check
tests of the 4.0-in specimens
The results of the helium leak check tests are shown in Table 3 and Table 4. The internal vacuum was main-
tained at a minimum of 1 x 10-7 scc/sec for the 3.0 in and 4.0 in diameter specimens. The helium leak check
tests did not reveal failure for all the specimens tested.
8
Specimen # Target
Pressure
Test Time Result
(PSI)
1 300 5 min. 300
2 300 5 min. 300
3 300 5 min. 300
4 300 5 min. 300
5 300 5 min. 300
6 300 5 min. 300
7 300 5 min. 300
8 300 5 min. 300
9 300 5 min. 300
10 300 5 min. 300
11 300 5 min. 300
12 300 5 min. 300
13 300 5 min. 300
14 300 5 min. 300
15 300 5 min. 300
16 300 5 min. 300
17 300 5 min. 300
18 300 5 min. 300
19 300 5 min. 300
20 300 5 min. 300
21 300 5 min. 300
22 300 5 min. 300
Table 5: Results of the hydrostatic proof
tests of the 3.0-in specimens
Table 6: Results of the hydrostatic proof
tests of the 4.0-in specimens
Specimen # Target
Pressure
Test Time Result
(PSI)
1 300 5 min. 300
2 300 5 min. 300
3 300 5 min. 300
4 300 5 min. 300
5 300 5 min. 300
6 300 5 min. 300
7 300 5 min. 300
8 300 5 min. 300
9 300 5 min. 300
10 300 5 min. 300
11 300 5 min. 300
12 300 5 min. 300
13 300 5 min. 300
14 300 5 min. 300
15 300 5 min. 300
16 300 5 min. 300
17 300 5 min. 300
18 300 5 min. 300
19 300 5 min. 300
20 300 5 min. 300
21 300 5 min. 300
22 300 5 min. 300
3.3 Hydrostatic Proof Tests
The results of the hydrostatic proof tests are shown in Table 5 and Table 6. The internal pressure was main-
tained at a minimum of 300 psi ,for a minimum of 5 min., for the 3.0 in and 4.0 in diameter specimens. The
hydrostatic proof tests did not reveal failure for all the specimens tested.
9
3.4 Hydrostatic Burst Tests
Specimen # Target
Pressure
(PSI)
Result
(PSI)
8 500 568
9 500 556
17 500 574
18 500 572
Specimen # Target
Pressure
(PSI)
Result
(PSI)
5 500 553
6 500 558
7 500 566
8 500 573
Table 7: Results of the hydrostatic burst
tests of the 3.0-in specimens
Table 8: Results of the hydrostatic burst
tests of the 4.0-in specimens
The hydrostatic burst tests were conducted on up to four (4) specimens for each diameter
size, previously hydrostatically proof tested. The burst test results (see Table 7 and Table 8)
show that both the 3.0 in and 3.0 in diameter specimens reached the target 2.5X minimum
burst pressure (500 psi).
4.0 SUMMARY OF THE RESULTS
Table 9: Summary of the results for the 3.0-in specimens
Specimen # Pneumatic Proof
Test
Helium Leak Check
Test
Hydrostatic Proof
Test
Hydrostatic Burst
Test
1 Pass Pass Pass n/a
2 Pass Pass Pass n/a
3 Pass Pass Pass n/a
4 Pass Pass Pass n/a
5 Pass Pass Pass n/a
6 Pass Pass Pass n/a
7 Pass Pass Pass n/a
8 Pass Pass Pass Pass
9 Pass Pass Pass Pass
10 Pass Pass Pass n/a
11 Pass Pass Pass n/a
12 Pass Pass Pass n/a
13 Pass Pass Pass n/a
14 Pass Pass Pass n/a
15 Pass Pass Pass n/a
16 Pass Pass Pass n/a
17 Pass Pass Pass Pass
18 Pass Pass Pass Pass
19 Pass Pass Pass n/a
20 Pass Pass Pass n/a
21 Pass Pass Pass n/a
22 Pass Pass Pass n/a
Specimen # Pneumatic Proof
Test
Helium Leak Check
Test
Hydrostatic Proof
Test
Hydrostatic Burst
Test
1 Pass Pass Pass n/a
2 Pass Pass Pass n/a
3 Pass Pass Pass n/a
4 Pass Pass Pass n/a
5 Pass Pass Pass Pass
6 Pass Pass Pass Pass
7 Pass Pass Pass Pass
8 Pass Pass Pass Pass
9 Pass Pass Pass n/a
10 Pass Pass Pass n/a
11 Pass Pass Pass n/a
12 Pass Pass Pass n/a
13 Pass Pass Pass n/a
14 Pass Pass Pass n/a
15 Pass Pass Pass n/a
16 Pass Pass Pass n/a
17 Pass Pass Pass n/a
18 Pass Pass Pass n/a
19 Pass Pass Pass n/a
20 Pass Pass Pass n/a
21 Pass Pass Pass n/a
22 Pass Pass Pass n/a
Table 10: Summary of the results for the 4.0-in specimens
10
Top Related