ASTM F1387 Testing of Mechanically Attached Fittings Evans … · 2019-11-14 · 1.0 OBJECTIVE This...

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


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


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


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


Table 6: Results of the hydrostatic proof


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


Table 8: Results of the hydrostatic burst


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







8 Pass Pass Pass Pass















Specimen # Pneumatic Proof

Test

Helium Leak Check

Test

Hydrostatic Proof

Test

Hydrostatic Burst

Test























Table 10: Summary of the results for the 4.0-in specimens

10

ASTM F1387 Testing of Mechanically Attached Fittings Evans … · 2019-11-14 · 1.0 OBJECTIVE This...

Documents

Transcript of ASTM F1387 Testing of Mechanically Attached Fittings Evans … · 2019-11-14 · 1.0 OBJECTIVE This...