Technical Comments to Draft 15 February 2011 SGS-12
Req
uest
or
JASI
C
Ref.
Clause
No./
Annex
B.5.1.1.2
Text
B.5.1.1.2
Cycle Life.
Baseline Initial Pressure
Three (3) randomly selected new
container shall be hydraulically pressure
cycled to 125% NWP without rupture for
22,000 cycles or until leak occurs
(B.6.2.2.2 test procedure). Leakage shall
not occur within the initial number of
cycles (#Cycles). For the 15 years
service life, the required #Cycles cannot
be greater than 11,000, and it could be set
by the Contracting Party at a lower
number but not lower than 5,500 cycles.
JASI
C
B.5.3.1.2
Proposed change by the
Requestor
Three (3) randomly selected new
container shall be hydraulically
pressure cycled to 125% NWP
without rupture for four times of
the initial number of cycles ( 4
X ( # Cycles) ) or until leak
occurs (B.6.2.2.2 test procedure).
B.5.3.1.2 Fueling port label: A label
shall be provided close to the receptacle, a) For gaseous hydrogen: Fuel
for example, inside a refilling hatch, type, NWP, date of removal from
service of containers.
showing the following information:
Contracting parties may specify
a) For gaseous hydrogen: Fuel type, additional labeling
NWP, date of removal from service requirements.
of containers.
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Comment (justification for change)
The design philosophy of LBB is to keep the
damages minimum when the container comes to
break down at worst case in the presence of flaw
or defect. Therefore, it is extremely important,
from the standpoint of safety, to verify that the
container begins to leak before burst.
Type 2 containers, in particular, may break
without LBB when circumferential wrap (hoop
wrap) is too tight.
The number of repeating until breaking has a
statistical distribution in containers or production
lots. If two times of the initial number of cycles
( 2 X ( # Cycles) ) is introduced, there is
possibility that some containers do not reach
LBB condition. These containers may bring
hazardous accident if they come to break down.
Four times of the initial number of cycles ( 4 X
( # Cycles) ) is used in Japanese standard and
others. It is necessary to have enough evidence
and experience If two times is introduced in gtr.
Our understanding was that the sentence
“Contracting parties may specify additional labeling
requirements” should be moved to Part A.
However, the draft is not modified accordingly.
On the other hand, the above sentence is
contained in B.5.1.5 (Labeling). We need to
harmonize the language about “additional labeling
requirements” between container label and
receptacle label.
Technical Comments to Draft 15 February 2011 SGS-12
B.5.1.3.5
B.6.2.5.2
JASI
C
B.5.1.3.5
Residual Strength Burst Test
(hydraulic).
The storage container will undergo a
hydraulic burst
test in accordance with test procedure
B.6.2.2.1 to
verify that the burst pressure is within
20% of the
baseline burst pressure determined in
B.5.1.1.1).
B.5.1.3.5
Residual Strength
Burst Test
(hydraulic).The storage container
will
undergo a hydraulic burst test in
accordance with test procedure
B.6.2.2.1 to verify that the burst
pressure is within 20% of the
baseline
burst
pressure
determined
inB.5.1.1.1).
B.5.1.3.5 The containers with
plastic liner shall be sectioned and
the liner and liner/end boss
interface inspected for evidence of
any deterioration, such as fatigue
cracking, disbonding of plastics,
deterioration of seal, or damage
from electrostatic discharge.
B.6.2.5.1 Fire Test (Pneumatic)
B.6.2.5.2 Engulfing fire test:
Please find attached file.
It is necessary to confirm no blister by this
inspection.
This test is same as ANSI/CSA NGV2-2000.
As Japan does not have any test criteria examples
(we only have the OK examples), we are currently
studying those criteria.
We believe it is necessary to clarify the definition of
test specimen.
Please see attached power point document.
※Japan will propose language to justify
the inclusion of Method 1, Method 2, and
the engulfing fire test, including definition
of bare container and shielding
components.
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Technical Comments to Draft 15 February 2011 SGS-12
B.6.2.1.5 Coating test. For containers
with external environmental coatings,
coatings shall be evaluated as follows:
a) adhesion strength based on ISO
4624; the coating shall exhibit
an adhesion rating of 4.
b) flexibility based on ASTM D522
Method B with a 12.7 mm
mandrel
at
the
specified
thickness at -20C; the coating
shall exhibit no apparent cracks
c) impact resistance in accordance
with ASTM D2792. The coating
at room temperature shall pass a
forward impact test of 18 J.
d) water exposure based on ASTM
G154 using an exposure of 1000
hours.
There shall be no
evidence of blistering.
The
adhesion shall meet a rating of 3
when tested in accordance with
ISO 4624.
e) salt spray exposure in accordance
with ASTM B117 using an
exposure of 500 hours. There
shall be no evidence of blistering.
The adhesion shall meet a rating
of 3 when tested in accordance
with ASTM D3359.
B.6.2.1.5
Coating test.
For It is necessary to define the applicable container.
seamless steel containers with This test is expected to be applied to seamless
external environmental coatings, steel containers.
coatings shall be evaluated as
follows:
B.6.1.XX
Post-Crash
Hydrogen Add the sentence in the current This language was accepted at Task Force
meeting in Berlin.
Container Installation Integrity
draft gtr text.
The container shall remain attached to
the vehicle at a minimum of one
attachment point.
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