ISO 15590-2-2021 pdf download.Petroleum and natural gas industries一Factory bends, fittings and flanges for pipeline transportation systems – Part 2: Fittings.
8.3.2 Welding
Welding operations shall be conducted in accordance with those elements of Iso 3834-2 decided by agreement and the requirements of this document.
Welding and repair welding shall be performed in accordance with procedures qualified in accordance with ASME BPVC Section IX or 1S015614-1.
Welders and welding operators shall be qualified in accordance with ASME BPVC Section IX or
ISO 9606-1.
Acceptance criteria for all tests shall be as specified in Clause 9.
Where practicable, longitudinal butt welds should be double-sided. Backing rings shall not be used. All welds shall have complete penetration and shall be finished in accordance with Clause 9.
Temporary weLded attachments shall be removed, where possible, before heat treatment and the weld area shall be treated in accordance with 9.5.3.4 and 9.5.3.5.
Fittings shall not contain girth welds.
All welds that will remain in the fitting shall be heat-treated in accordance with 8.3.3.
8.3.3 Heat treatment
All fittings shall be normalized, normalized and tempered, or quenched and tempered after welding and/or forming. The heat treatment shall be performed in accordance with a documented procedure. The procedure shall define the following parameters, where appropriate, for the type of heat treatment:
a) heating schedule;
b) soaking temperature;
c) soaking time;
d) cooling schedule;
e) quenching temperature;
1) quenching medium, including commencing and final medium temperature.
g) maximum transfer time to quench
A record shall be maintained of each heat treatment. Submission of heat treatment record shall be specified at P0 stage and it shall be included in the inspection document.
The tolerances on specified nominal values of soaking temperature and soaking time shall be ±15 °C and +20 %, respectively.
8.3.4 End preparation
Unless otherwise specified, the details of the welding end preparation shall be in accordance with Figures 1 and 2. The root face of the fittings shall be machined flat and shall not vary from the plane by more than 0,76 mm (0.03 in.) at any point. Where the body wall of the fittings exceeds that of matching pipe, the transition shall be in accordance with Figure 3.ISO 15590-2 pdf download.