APLICATIVO EN HOJA ELECTRÓNICA DE PROGRAMACIÓN PARA LOS PEDIDOS DE

12.1.1.1 NDE shall be performed in accordance with API 650, plus API 653 supplemental requirements.

12.1.1.2 Personnel performing NDE shall be qualified in accordance with API 650.

12.1.1.3 Acceptance criteria shall be in accordance with API 650.

NOTE: Appendix "F" is not mentioned.

12.1.1.5 Appendix G is mentioned fro qualifying personnel and procedures when using MFL.

12.1.2 Shell Penetrations

12.1.2.1 UT lamination check required for:

a. Adding reinforcement plate to an unreinforced penetration.

b. Installing a hot-tap connection.

12.1.2.2 Cavities from gouging or grinding to remove reinforcement pad welds require either a magnetic particle or liquid

penetrant test.

12.1.2.3 Completed welds attaching nozzle to shell or pad to shell and nozzle neck shall be examined by a magnetic particle or liquid penetrate test. Consideration should be given for extra NDE on hot taps.

12.1.2.4 Complete welds in stress relieved components require magnetic particle or liquid penetrate testing (after stress relief, but before hydrostatic test).

12.1.3 Repaired Weld Flaws

12.1.3.1 Cavities from gouging or grinding to remove weld defects shall be either a magnetic particle or liquid penetrate tested.

12.1.3.2 Completed repair of butt welds shall be examined over their full length by UT or radiographic methods.

12.1.4 Temporary and Permanent Attachments to Shell Plates

12.1.4.1 A ground area resulting from the removal of attachments requires a visual test.

12.1.4.2 Completed welds on permanent attachments shall be examined by MT or PT, groups IV-VI, excluding the shell to bottom weld.

12.1.5 Shell-to-Shell Plate Welds

New welds attaching shell plate to shell plate require visual and

radiographic examination. Additionally, plate greater than 1", the back-gouged surface of root pass and final pass (each side) shall be examined over its full length by a magnetic particle or liquid penetrate test.

12.1.5.2 New welds on new shell plate to new shell plate are to be examined and radiographed to API 650.

12.1.6 Shell-to Bottom

12.1.6.1 Joints shall be inspected over its entire length by a right angle vacuum box and a solution film, or by applying light diesel oil. (“Diesel” test technique).

12.1.6.2 An air pressure test may be used to check the shell-to-bottom weld.

12.1.8.2 (New Paragraph) deals with lap welded shell patches.

12.2 Radiographs

Number and location - Same as API-650, plus the following additional requirements:

12.2.1.1 Vertical Joints

a. New plate to new plate: Same as API 650.

b. New plate to existing plate: Same as API 650, plus one (1) additional radiograph.

c. Existing plate to existing plate: Same as API 650, plus one (1) additional radiograph.

12.2.1.2 Horizontal Joints

a. New plate to new plate: Same as API 650.

b. New plate to existing plate: Same as API 650, plus one (1) additional radiograph for each 50 feet of horizontal weld.

c. Existing plate to existing plate: Same as API 650, plus one (1) additional radiograph for each 50 of horizontal weld..

12.2.1.3 Intersections

a. New plate to new plate: Same as API 650.

b. New plate to existing plate: Shall be radiographed.

c. Existing plate to existing plate: Shall be radiographed.

12.2.1.4 Each butt-weld annular plate joint - Per API-650.

12.2.1.5 For reconstructed tanks 25 percent of all junctions shall be radiographed.

12.2.1.6 New and replaced shell plate or door sheet welds:

12.2.1.6.1 Circular - Minimum one (1) radiograph 12.2.1.6.2 Square or Rectangular:

One (1) in vertical, one (1) in horizontal, one (1) in each corner.

NOTE: All junctions between repair and existing weld shall be radiographed. If defects are found, 100% is required on weld repair area.

12.2.1.8 For penetrations installed using insert plates as described in 9.8.2, the completed butt welds between the insert plate and the shell plate shall be fully radiographed.

12.2.2 Criteria Acceptance

If a radiograph of an intersection between new and old weld detects unacceptable flaws (by current standards) the weld may be evaluated according to the original construction standard.

12.3 Hydrostatic Testing

12.3.1.1 A full hydrostatic test, held for 24 hours, is required on:

a. A reconstructed tank.

b. Any tank that has had major repairs or alterations (See 12.3.1.2.) unless exempted by 12.3.2 for the applicable combination of materials, design and construction features.

c. A tank where an engineering evaluation indicates the need for the hydrostatic test.

12.3.1.2 Major Repair/Alteration

Operations that require cutting, addition, removal and/or replacement of annular plate ring, shell to bottom weld or a sizable shell segment. Major would therefore include:

a. The installation of any shell penetration (beneath the design liquid level) larger than 12" or any bottom penetration within 12" of the shell.

b. Any shell plate (beneath design liquid level) or any annular plate where the longest dimension of plate exceeds 12".

c. The complete or partial ( more than "1/2 t" of the weld thickness) or more than 12" of vertical seams, or radial annular plate welds.

d. New bottom installation if the foundation under the new bottom is not disturbed.

1. The Annular ring remains intact

2. The welding repair does not result in welding on the existing bottom within the critical zone.

e. Partial of complete jacking of a tank shell.

12.3.2 Hydrostatic not Required Conditions

12.3.2.1 A full hydrostatic test of the tank is not required for major repairs and major alterations when:

a. The repair has been reviewed and approved by an engineer, in writing.

b. The tank owner or operator has authorized the exemption in writing.

12.3.2.2 Shell Repair

12.3.2.2.1 Weld procedures for shell repair must include impact testing.

12.3.2.2.3 New requirements, new shell materials must API 650 7th edition or later, must meet requirements for brittle fracture, stress must not be more than 7,000 psi as calculated from the new formula given in this paragraph.

S = 2.6 H D G t

S = shell stress in pounds per square foot H = tank fill height above the bottom of

repairs or alteration in feet

t = shell thickness at area of interest in inches

D = tank mean diameter in feet G = specific gravity of product

12.3.2.2.5 New radiography requirements, the finished weld in the shell plates shall be fully radiographed.

12.3.2.2.8 A big change in this section, door sheets shall comply with the requirements for shell plate installation, except they shall not extend to or intersect the bottom-to-shell joint.

12.3.2.3 Bottom Repair Within the Critical Zone

12.3.2.3.1 Now allows UT to be used on annular plate butt welds

12.5 Measured Settlement (During Hydro)

12.5.1.1 When settlement is anticipated, the tank being hydro-tested must have a settlement survey.

12.5.1.2 Initial Settlement Survey:

With tank empty, using the number of bottom plate projections as elevation measuring points (N), uniformly distributed around the circumference.

FORMULA: N=D/10