POSITIVE SEAL COUPLING SYSTEM DEVELOPMENTAL and TESTING DATA
DATE: 21 April 1994 through 01 May 1994.
OBJECTIVES: 1. To demonstrate and confirm 100% pipe Specified Minimum Yield Strength (SMYS) internal hydrostatic pressure capability of a NPS 10” Positive Seal Coupling (PSC) connection designed to the client’s line pipe and pressure requirements.
2. To clarify to client’s (Bechtel U.K., Ltd.) representative witness of a 100% pipe SMYS internal hydrostatic test pressure on a NPS 10” test line containing 6 each Positive Seal Coupling connections.
PROCEDURES: In July 1993, Jetair’s Middle East Agent and Jetair International, Inc. were awarded a contract from Bechtel U.K. Ltd. to supply line pipe, internal & external Fusion Bond Epoxy coating, and the Positive Seal Coupling System for the ADNOC Onshore Gas Development Project 545 Maqta-Habshan 124.5 km NPS 10” potable water pipeline.
As a matter of quality assurance PSC acceptance testing, part of Bechtel’s Specification No. RP-05-95-008 Pipeline External Couplings required that “6 joints of pipe shall be strung and coupled. These shall then be subjected to a hydrostatic test of 100% pipe SMYS.” The specified line pipe was NPS 10”, 10.750” (273.1 mm) OD, 0.219” (5.56 mm) wall thickness, API 5L Grade B. The 100% pipe SMYS internal hydrostatic test pressure is 1,426 psi (98.3 bar).
The Positive Seal Couplings designed and provided by Jetair for this application were DRT No. 32042DVA.
To meet the first objective, Jetair’s Middle East Agent made up a single 10” PSC
connection and hydrotested it more than 1,426 psi 3 separate times. The
required 6 joint line was then constructed and pre-tested. The next day the official 6 joint hydrotest was run and witnessed by Bechtel to meet the second objective.
DATE & LOCATION: 16 & 17 November 2004 at Stress Engineering Services, Houston, Texas. USA
TEST OBJECTIVES: To demonstrate and confirm that the Positive Seal Coupling (PSC) connections’actual axial tension strength meets or exceeds the designed, engineered, and calculated design axial tension strength.
Comparisons of the actual axial PSC connection strengths (failure loads) will be made to other relevant axial pipe loads Including the connectlon make-up (pipe-PSCinsertion) force, the axial pipe load at 72% pipeline design pressure and at 90% pipeline hydrotest pressure, and the aldal pipe load at the pipes' epecllledminimum yield strength (SMYS) to identify and confirm adequate PSC connection strength safety factors.
TEST SAMPLES SPECIFICATION & PREPARATIONS: Three 10-in and three 8-in PSC connections were made up 12 and 13 October 2004 using JU Model 10146.
The 10-in pipe was 10.750-in. 0.438-in (11.13-mm) wall thickness, API 5L PSL1 GradeX52, all from the same heat lot of pipe, joined with PSC Design Code Number (DCN)S1188C28C. The make-up (insertion) forces for the six 10-ln pipe ends ranged from 330.000-lbs to 380.000-lbs (Photograph 1).
The 8-ln pipe was 8.625-ln, 0.500-in (12.70-mm) wall thickness, API 5L PSL2 GradeX42. all from the same heat lot of pipe, joined with PSC DCN S1025C22A. The make-up (lnsertlon) forces for the slx 8-ln pipe ends ranged from 215,000-lbs to 245,000-lbs(Photograph 2).
PROCEDURES:End caps with test frame Installation threads were welded onto each pipe end (photographs 3 & 4). External, and some internal, strain gauges had been installed on each sample for strain data acquisition and subsequent PSC connection performance analysts by Jetair. Each test sample was loaded into the SES 2,000,000-lb tension test frame (Photographs 5 & 6). Then a longitudinal displacement gauge was installed across the entire length of each sample which. along with all of the strain gauges and the test frame load gauge, were wired to a SES data acquisition, monitoring. and plotting computer system.
Each sample was then loaded axially ln tension untll failure of the PSC-pipe connection which was when a pipe end pulled loose from the grip of the PSC and the axial load dropped. See attached SES 'T enslon to Failure Test Results - Axial Strains' plots for each test sample. These tests were performed at SES on 16 and 17 November 2004.
At Jetair International, we always strive to develop advanced and comprehensive technology in mechanical joint fittings. As a firm that specializes in international expertise in Positive Seal Coupling System, we regularly perform third party tests on pressure to failure, stress analysis, and thermal-cycling to offer our clients the best available solutions in the industry. We ensure maximum coating integration across all mechanical and pipe joints.
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