D i s b o n d i n g A p p a r a t u s f o r A S T M G 1 4 6
Disbonding Apparatus for ASTM G146
Parr Instrument Company
has developed an automat-
ed reactor system capable
of attaining the conditions
necessary for treating
samples consisting of bime-
tallic plate typically used in
refinery high pressure/ high
temperature (HP/HT) hydro-
gen gas service.
The test temperature and
hydrogen gas pressure are
selected to simulate those
conditions found in refinery
hydrogen-containing envi-
ronments.These typically
range from 14 to 20 MPa
hydrogen gas pressure and
temperature from 300 to
500 °C depending on actual
refinery service conditions
under consideration.
The purpose of this test
scheme is to allow for com-
parison of data among test
laboratories on the resis-
tance of bimetallic stainless alloy/steels to hydro-
gen induced disbonding (HID).This test procedure
provides an indication of the resistance or suscep-
tibility, or both, to HID of a metallurgically bonded
stainless alloy surface layer on a steel substrate
due to exposure to hydrogen-containing gaseous
environments under HP/HT conditions.
This system can be used over a broad range of
pressures, temperatures, cooling rates, and gas-
eous hydrogen environments where HID could
be a significant problem.These tests can be used
to assess the effects of material composition,
processing methods, fabrication techniques, and
heat treatment as well as the effects of hydrogen
partial pressure, service temperature, and cooling
rate.This testing regime is fully described in ASTM
Standard Practice G146.
The apparatus developed by Parr consists of a
high pressure, high temperature test cell made
from Inconel 625.Two gas booster pumps, one for
nitrogen and the other for hydrogen, are used for
pressurizing the test cell.
Layout view of Parr’s newAutomated Apparatus for Performing Hydrogen Induced
DisbondingTests
Automated Apparatus for Performing Hydrogen Induced Disbonding Tests for ASTM G146
