·
Category
D:
|
Flammable, unstable or toxic fluids which are gases or a
mixture of gas and liquid with a TGLR>250 but H2S < 500 ppm
in the gas phase at prevailing ambient temperature and atmospheric pressure
plus 0.5 bar, i.e. the vapour pressure is higher than 1.5 bar (abs) at
ambient temperature. Example: natural gas, liquid petroleum gas, ammonia,
typical’ low risk sour facility’ or high GOR oil condensate and gas flowline
fluids.
|
Extent of Required
Examination
|
|||||||
Material
|
Fabrication
|
Fabrication of Longitudinal
Welds
|
Mechanical Joints
|
Erection
|
Complete system Meets
Design (2)
|
Other Examinations
|
|
Category D
|
Random
|
Random
|
Random
|
Random
|
Random
|
Random
|
Random (3)
|
Normal
|
Random
|
5%(5)
|
100%
|
Random(1)
|
Random
|
Random
|
5% Vol. (4)
|
Category M
|
Random
|
100%
|
100%
|
100%
|
Random
|
Random
|
20% Vol.
|
High Pressure
|
100%
|
100%
|
100%
|
100%
|
Random
|
Random
|
100% Rad.
|
Severe Cyclic
|
Random
|
100%
|
100%
|
100%
|
100%
|
Random
|
100% Vol.
|
Notes: (1) When pneumatic testing is to be used, 100% of
mechanical joints shall be examined. (2) Includes any additional examination
or testing required by engineering. (3) Category D Systems require welds to
be random visually examined.
|
(4) When brazed joints are
used, 5% in-process examination is performed. (5) Socket welds require 5%
visual examination of final weld. Note: Vol = Volumetric weld
examination such as a radiography or ultrasonic. Rad = Radiography
|
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Thanks & Regards
J.Gerald Jayakumar
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CANm_%2BDh045%2BW6%3DcSYgjUbTd-MSCv7%2BiymbnmtBitmTF2EeQ_ig%40mail.gmail.com.