API 510 Preparatory Class
Lesson 1
Service Restrictions, Joint Efficiencies,
Radiography
, Lesson 1
Objectives
• Understand the service restrictions placed on weld joints
based on service conditions.
• Identify weld joints by Categories (location in vessel).
• Identify welds by Types. (how made, double welded etc.).
• Determine the accept/reject values for weld
imperfections located using radiography.
• Define the extent of radiography required by Code for a
desired joint efficiency.
, Lesson 1
Objectives
• Find weld joint efficiency (E) by using Table UW-12.
• Determine weld joint efficiencies based on RT markings.
• Determine the E to be used for calculating the required
thickness or allowed pressure for Seamless Shell
sections and Seamless heads.
• Understand the rules for using welded pipe and tubing.
, UW-2 Service Restrictions
Page 114 Section VIII
(a) When vessels are to contain lethal footnote 1 substances,
either liquid or gaseous, all butt welded joints shall be
fully radiographed, except under the provisions of
UW-2(a)(2) and UW-2(a)(3) below, and UW-11(a)(4).
When fabricated of carbon or low alloy steel, such vessels
shall be postweld heat treated.
footnote 1 1When a vessel is to contain fluids of such a
nature that a very small amount mixed or unmixed with
air is dangerous to life………..
Lesson 1
Service Restrictions, Joint Efficiencies,
Radiography
, Lesson 1
Objectives
• Understand the service restrictions placed on weld joints
based on service conditions.
• Identify weld joints by Categories (location in vessel).
• Identify welds by Types. (how made, double welded etc.).
• Determine the accept/reject values for weld
imperfections located using radiography.
• Define the extent of radiography required by Code for a
desired joint efficiency.
, Lesson 1
Objectives
• Find weld joint efficiency (E) by using Table UW-12.
• Determine weld joint efficiencies based on RT markings.
• Determine the E to be used for calculating the required
thickness or allowed pressure for Seamless Shell
sections and Seamless heads.
• Understand the rules for using welded pipe and tubing.
, UW-2 Service Restrictions
Page 114 Section VIII
(a) When vessels are to contain lethal footnote 1 substances,
either liquid or gaseous, all butt welded joints shall be
fully radiographed, except under the provisions of
UW-2(a)(2) and UW-2(a)(3) below, and UW-11(a)(4).
When fabricated of carbon or low alloy steel, such vessels
shall be postweld heat treated.
footnote 1 1When a vessel is to contain fluids of such a
nature that a very small amount mixed or unmixed with
air is dangerous to life………..
