API570 exams Flashcards
What is the min preheat temp when perform preheat in lieu of PWHT
The weld area shall be preheated and maintained at a minimum temperature of 300°F (150°C) during welding. The 300 °F (150 °C) temperature should be checked to assure that 4 in. (100 mm) of the material or four times the material thickness (whichever is greater) on each side of the groove is maintained at the minimum temperature during welding.
At what condition should you consult with a CS?
- temp > 750F
2. Temp below brittle
piping INTERNAL inspection should be conducted based on what code?
API510 / 572
what code provides guidance for welding on in service piping?
API 2201
what materials are subject to polytheonic acid SSC?
austenitic SS
Local PWHT may be substituted for 360° banding on local repairs on all materials, provided the following precautions and requirements are applied.
a) The application is reviewed, and a procedure is developed by the piping engineer.
c) A preheat of 300 °F (150 °C), or higher as specified by specific welding procedures, is maintained while welding.
d) The required PWHT temperature shall be maintained for a distance of not less than TWO times the base metal thickness measured from the weld. T
e) Controlled heat also shall be applied to any branch connection or other attachment within the PWHT area.
f) The PWHT is performed for code compliance and not for environmental cracking resistance
WHO will designate any inspection hold points
required during the repair or alteration sequence.
The inspector
Each owner/user organization _______be audited periodically to determine if they are meeting the requirements of an authorized inspection agency as defined in this inspection Code.
SHOULD
SHOULD =?
recommendations
the initial thickness measurement determinations shall be made after no more than ______ of service by using nondestructive thickness measurements of the piping system.
3 months
another term for pneumatic test?
hydropneumatics
Assessment of General Metal Loss Local Metal Loss Pitting Corrosion evaluate blisters and laminations, weld misalignment and piping distortions evaluate crack-like flaws, valuate the effects of fire damage can use what code?
API579
Threaded components and other flanged spool pieces that may be easily removed and reinstalled deserve particular attention because of their higher potential for installation
of incorrect materials of construction
When lifting piping that is in operation, extra care should be
exercised and consultation with an engineer may be necessary.
when is the approval of a piping engineer needed? (3
- assess crack like flaws
- review and/or approve RBI
- when performing a hydrotest to ensure that the piping will be suitable
who can determine whether a hydrotest is necessary after repair welding is complete?
inspector
New connections and replacements may installed on existing piping provided
they are designed and fabricated per the applicable code
use of NDE for substitute for pressure testing needs who approval?
inspector or engineer
extent of material verification used for repairs/alteration is determined by
owner/users
the period between thickness measurements for CMLs or circuits should not exceed (2)
one-half the remaining life or the maximum intervals recommended in Table 1,
what pipe material should be hydro with potable water or steam condensate? and what ppm of clorine?
SS , <50ppm
Acceptance of a welded repair or alteration shall include NDE in accordance with the
applicable code and the owner/user’s specification, unless otherwise specified in API 570.
If calculations indicate that an inaccurate rate of corrosion has been assumed, the rate to be used for the next period shall be adjusted
to agree with the actual rate found.
surveying the route of buried pipe is performend at what intervals?
6 months