Possibility of using welded tees at OJSC "Gazprom"

The explanation of the possibility of using welded tees during construction of JSC "Gazprom". The possibility of applying the criterion is to satisfy the criteria of static and cyclic strength of the proposed tees.
Materials and methods
Software package TRIFLEX implements finite element calculation of thestress-strain state (SSS) spatial piping systems. ANSYS software system implements a finite element calculation of VAT derivatives structures.
Results
Local equivalent stresses in tees TC1020 (22K60) x720 (18K60)-9,8-0,6- CL does not exceed 426 MPa, while the average equivalent stress in the dangerous sections do not exceed237 MPa, which is 53.7% of the strains permitted by [1]. Tee for the specified allowable number of load cycles is equivalent to 2896, which correspond to the lifetime of the tee - 90 years. Local equivalent stresses in tees TC1420 (32K60) x1020 (22K60)-9,8-0,6- CL does not exceed 465MPa, whilethe average equivalent stress in the dangerous sections do not exceed245MPa, which is 55.6% of the strains allowed in [1]. Tee for the specified allowable number of load cycles is equivalent to 2850, which correspond to the lifetime of the tee - 89 years. Thus the basic technological pipelines, as well as tees TC 1020 (22K60) x720 (18K60)-9,8-0,6-CL and TC 1420 (32K60) x1020 (22K60)-9,8-0,6-CLas part of COP considered binding conditions satisfy the static strength. Level equivalent stresses in welded tees at operational mode and hydraulictesting does not exceed 62% of the maximum allowable in [1]. The service life of welded T-joints is not less than82 years. This period exceeds the expected life safe operation of process piping typical compressor stations -40 years.
Сonclusions
Thus, T-TC 1020 (22K60) x720 (18K60)-9,8-0,6-CL, TC 1420 (32K60) x1020 (22K60) -9,8-0,6-CL can be used instead of tees TSHS 1020 (22K60) h720 (18K60) -9,8-0,6-UHL, 1420(32K60) h1020 (22K60) -9,8-0,6-UHL as part of the piping under consideration compressor station, as well as other compressor stations OJSC "Gazprom" in the justification of sufficient strength.