[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR173.225]
[Page 533-545]
TITLE 49--TRANSPORTATION
CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF
TRANSPORTATION
PART 173_SHIPPERS_GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents
Subpart E_Non-bulk Packaging for Hazardous Materials Other Than Class 1
and Class 7
Sec. 173.225 Packaging requirements and other provisions for organic
peroxides.
(a) General. When the Sec. 172.101 table specifies that an organic
peroxide be packaged under this section, the organic peroxide must be
packaged and offered for transportation in accordance with the
provisions of this section. Each packaging must conform to the general
requirements of subpart B of part 173 and to the applicable requirements
of part 178 of this subchapter. Non-bulk packagings must meet Packing
Group II performance levels. To avoid unnecessary confinement, metallic
non-bulk packagings meeting Packing Group I are not authorized. No used
material, other than production residues or regrind from the same
production process, may be used in plastic packagings. Organic peroxides
which require temperature control are subject to the provisions of Sec.
173.21(f).
(b) Organic peroxides table. The following Organic Peroxides Table
specifies, by technical name, those organic peroxides that are
authorized for transportation and not subject to the approval provisions
of Sec. 173.128 of this part. An organic peroxide identified by
technical name in the following table is authorized for transportation
only if it conforms to all applicable provisions of the table. For an
organic peroxide not identified in the table by technical name or a
formulation of identified organic peroxides, the provisions of paragraph
(c) of Sec. 173.128 apply. The column headings of the Organic Peroxides
Table are as follows:
(1) Technical name. The first column specifies the technical name.
(2) ID number. The second column specifies the identification (ID)
number which is used to identify the proper shipping name in the Sec.
172.101 table. The word ``EXEMPT'' appearing in the column denotes that
the material is not regulated as an organic peroxide.
(3) Concentration of organic peroxide. The third column specifies
concentration (mass percent) limitations, if any, in mixtures or
solutions for the organic peroxide. Limitations are given as minimums,
maximums, or a range, as appropriate. A range includes the lower and
upper limits (i.e., ``53-100'' means from, and including, 53 percent to,
and including 100 percent). See introductory paragraph of Sec.
172.203(k) of this subchapter for additional description requirements
for an organic peroxide that may qualify for more than one generic
listing, depending on its concentration.
(4) Concentration of diluents. The fourth column specifies the type
and concentration (mass percent) of diluent or inert solid, when
required. Other types and concentrations of diluents may be authorized
if approved by the Associate Administrator.
(i) The required mass percent of ``Diluent type A'' is specified in
column 4a. A diluent type A is an organic liquid that does not
detrimentally affect the thermal stability or increase the hazard of the
organic peroxide and with a boiling point not less than 150 [deg]C at
atmospheric pressure. Type A diluents may be used for desensitizing all
organic peroxides.
(ii) The required mass percent of ``Diluent type B'' is specified in
column 4b. A diluent type B is an organic liquid which is compatible
with the organic peroxide and which has a boiling point, at atmospheric
pressure, of less than 150 [deg]C (302 [deg]F) but at least 60 [deg]C
(140 [deg]F), and a flash point greater than 5 [deg]C (41 [deg]F). Type
B diluents may be used for desensitizing all organic peroxides provided
that the boiling point is at least 60 [deg]C (140 [deg]F) above the SADT
of the peroxide in a 50 kg (110 lbs) package. A type A diluent may be
used to replace a type B diluent in equal concentration.
(iii) The required mass percent of ``Inert solid'' is specified in
column 4c. An inert solid is a solid that does not detrimentally affect
the thermal stability or increase the hazard of the organic peroxide.
[[Page 534]]
(5) Concentration of water. Column 5 specifies, in mass percent, the
minimum amount of water, if any, which must be in formulation.
(6) Packing method. Column 6 specifies the highest packing method
(largest packaging capacity) authorized for the organic peroxide. Lower
numbered packing methods (smaller packaging capacities) are also
authorized. For example, if OP3 is specified, then OP2 and OP1 are also
authorized. The designation ``IBC'' means Special Provision IB52 in
Sec. 172.102 of this subchapter applies. The designation ``Bulk'' means
paragraph (e) of this section applies. When an IBC or bulk packaging is
authorized and meets the requirements of paragraph (e) of this section,
lower control temperatures than those specified for non-bulk packagings
may be required. The Table of Packing Methods in paragraph (d) of this
section defines the non-bulk packing methods.
(7) Temperatures. Column 7a specifies the control temperature.
Column 7b specifies the emergency temperature. Temperatures are
specified only when temperature controls are required. (See Sec.
173.21(f)).
(8) Notes. Column 8 specifies other applicable provisions, as set
forth in notes following the table.
[[Page 535]]
Organic Peroxide Table
--------------------------------------------------------------------------------------------------------------------------------------------------------
Diluent (mass %) Temperature ([deg]C)
Technical name ID number Concentration --------------------------- Water (mass Packing ---------------------- Notes
(mass %) A B I %) method Control Emergency
(1) (2).......... (3)........... (4a)... (4b)... (4c)... (5)......... (6)......... (7a).... (7b)...... (8)
--------------------------------------------------------------------------------------------------------------------------------------------------------
Acetyl acetone peroxide....... UN3105....... <=42.......... = OP7......... ........ .......... 2
-=48. 8.
Acetyl acetone peroxide [as a UN3106....... <=32.......... ....... ....... ....... ............ OP7......... ........ .......... 21
paste].
Acetyl benzoyl peroxide....... UN3105....... <=45.......... = OP4......... -10..... 0
peroxide. 12.
Acetyl cyclohexanesulfonyl UN3115....... <=32.......... ....... = OP8
-=6. 6.
tert-Amyl peroxyacetate....... UN3107....... <=62.......... 42- ....... ....... ....... ............ OP7......... ........ .......... 1, 9
100.
tert-Butyl cumyl peroxide..... UN3106....... <=42.......... ....... ....... 52- ....... ....... ....... ............ OP5
butylperoxy)valerate. 100.
n-Butyl-4,4-di-(tert- UN3106....... <=52.......... ....... ....... 79- ....... ....... ....... = OP5......... ........ .......... 13
90. 10.
tert-Butyl hydroperoxide...... UN3105....... <=80.......... 1 OP8......... ........ .......... 13, 16
4.
tert-Butyl hydroperoxide...... UN3109....... <=72.......... ....... ....... ....... = OP8, IBC, ........ .......... 13, 14
28. Bulk.
tert-Butyl hydroperoxide [and] UN3103....... <82+= OP5......... ........ .......... 13
Di- tert-butylperoxide. >9. 7.
tert-Butyl monoperoxymaleate.. UN3102....... 52- ....... ....... ....... ............ OP5
100.
tert-Butyl monoperoxymaleate.. UN3103....... <=52.......... 32- 77- <=23... ....... ....... ............ OP5
100.
tert-Butyl peroxybenzoate..... UN3105....... 52- 52- ....... ....... ....... ............ OP6......... +20..... +25
ethylhexanoate. 100.
tert-Butyl peroxy-2- UN3117....... 32- ....... 52- ....... 67- 57- ....... ....... = OP7
-=6. 17.
3-Chloroperoxybenzoic acid.... UN3106....... <=57.......... ....... ....... = OP7
-=3. 40.
Cumyl hydroperoxide........... UN3107....... 90- <=10... ....... ....... ............ OP8......... ........ .......... 13
98.
Cumyl hydroperoxide........... UN3109....... <=90.......... = OP6......... ........ .......... 13
9.
Cyclohexanone peroxide(s). UN3105....... <=72.......... = OP7......... +40..... +45....... 5
-=26. 8.
Diacetyl peroxide............. UN3115....... <=27.......... ....... 51- ....... ....... <=48... OP2......... ........ .......... 3
100.
Dibenzoyl peroxide............ UN3102....... 77- ....... ....... ....... = OP4......... ........ .......... 3
94. 6
Dibenzoyl peroxide............ UN3104....... <=77.......... ....... ....... ....... = OP6
23
Dibenzoyl peroxide............ UN3106....... <=62.......... ....... ....... = OP7 ........
-=28. 10
Dibenzoyl peroxide [as a UN3106....... 52- ....... ....... ....... OP7......... ........ .......... 21
paste]. 62.
Dibenzoyl peroxide [as a UN3108....... <=56.5........ ....... ....... = OP8
paste]. 15
Dibenzoyl peroxide............ UN3106....... 35- ....... ....... 36- 36- = OP5......... +25..... +30
13.
Di-(4-tert- UN3114....... <=100......... ....... ....... ....... ............ OP6......... +30..... +35
butylcyclohexyl)peroxydicarbo
nate.
Di-(4-tert-butylcyclothexyl) UN3119....... <=42.......... ....... ....... ....... ............ OP8, IBC.... +30..... +35....... ............
peroxydicarbonate [as stable
dispersion in water].
Di-tert-butyl peroxide........ UN3107....... 32- ....... ....... ....... OP8
100.
Di-tert-butyl peroxide........ UN3109....... <=52.......... ....... 80- ....... ....... ....... OP5
butylperoxy)cyclohexane. 100.
1,1-Di-(tert- UN3103....... 52- 27- ....... 52- ....... ....... ....... ............ OP4......... -20..... -10....... 6
100.
Di-sec-butyl peroxydicarbonate UN3115....... <=52.......... ....... 42- ....... ....... <=57... ............ OP7......... ........ .......... 1, 9
butylperoxyisopropyl)benzene( 100.
s).
Di-(2-tert- Exempt....... <=42.......... ....... ....... 42- 90- ....... ....... ....... ............ OP5......... ........ .......... ............
3,3,5- 100.
trimethylcyclohexane.
1,1-Di-(tert-butylperoxy)- UN3103....... 57- = OP5
23
Di-4-chlorobenzoyl peroxide UN3106....... <=52.......... ....... ....... ....... ............ OP7......... ........ .......... 21
[as a paste].
Di-4-chlorobenzoyl peroxide... Exempt....... <=32.......... ....... ....... 52- ....... <=48... ....... ............ OP8, IBC, ........ .......... 9, 11, 14
100. Bulk.
Dicumyl peroxide.............. UN3110....... 52- ....... <=48... ....... ............ OP8, IBC, ........ .......... 9, 11, 14
100. Bulk.
Dicumyl peroxide.............. Exempt....... <=52.......... 91- ....... ....... ....... ............ OP3......... +5...... +10
100.
Dicyclohexyl peroxydicarbonate UN3114....... <=91.......... ....... ....... ....... = OP5......... +5...... +10.......
9.
Didecanoyl peroxide........... UN3114....... <=100......... ....... ....... ....... ............ OP6......... +30..... +35
2,2-Di-(4,4-di(tert- UN3106....... <=42.......... ....... ....... = OP5.........
peroxide. 23.
Di-2,4-dichlorobenzoyl UN3106....... <=52.......... ....... ....... ....... ............ OP7.........
peroxide [as a paste with
silicone oil].
Di-(2-ethylhexyl) UN3113....... 77- ....... ....... ....... ............ OP5......... -20..... -10.......
peroxydicarbonate. 100.
[[Page 539]]
2,2-Di-(4,4-di-(tert- UN3107....... <=22.......... ....... 32- ....... = OP7......... ........ .......... 17
dihydroperoxide. -=5. 5.
Diisopropyl peroxydicarbonate. UN3112....... 52- ....... ....... ....... ............ OP2......... -15..... -5
100.
Diisopropyl UN3115....... <=52.......... .......
stable dispersion in water].
Di-(2-methylbenzoyl)peroxide.. UN3112....... <=87.......... ....... ....... ....... = OP5......... +30..... +35.......
13.
Di-(3-methoxybutyl) UN3115....... <=52.......... ....... 82- ....... ....... ....... OP5
(benzoylperoxy)hexane. 100.
2,5-Dimethyl-2,5-di- UN3104....... <=82.......... ....... ....... ....... = OP5
(benzoylperoxy)hexane. 18.
2,5-Dimethyl-2,5-di- UN3106....... <=82.......... ....... ....... 52- ....... ....... ....... ............ OP7
butylperoxy)hexane. 100.
2,5-Dimethyl-2,5-di-(tert- UN3101....... 87- ....... ....... ....... ............ OP5
butylperoxy)hexyne-3. 100.
2,5-Dimethyl-2,5-di-(tert- UN3103....... 52- 86- ....... ....... ....... ............ OP5......... ........ .......... ............
butylperoxy)hexyne-3. 100.
2,5-Dimethyl-2,5- UN3104....... <=82.......... ....... ....... ....... = OP7
dihydroperoxyhexane. 18.
2,5-Dimethyl-2,5-di-(3,5,5- UN3105....... <=77.......... 13- ....... ....... 85- ....... ....... ....... ............ OP5
phenoxyethyl)peroxydicarbonat 100.
e.
Di-(2- UN3106....... <=85.......... ....... ....... ....... = OP7
phenoxyethyl)peroxydicarbonat 15.
e.
Dipropionyl peroxide.......... UN3117....... <=27.......... ....... 72- ....... ....... ....... ............ OP4......... ........ .......... 18
100.
Disuccinic acid peroxide...... UN3116....... <=72.......... ....... ....... ....... = OP7......... +10..... +15
28.
Di-(3,5,5-trimethyl-1,2- UN3116....... <=52.......... ....... ....... ....... ............ OP7......... +30..... +35....... 21
dioxolanyl- 3)peroxide [as a
paste].
Di-(3,5,5- UN3115....... 38- 77 - ....... ....... ....... ............ OP5
butylperoxy)butyrate. 100.
Ethyl 3,3-di-(tert- UN3105....... <=77.......... 52 - ....... ....... ....... ............ OP4
tetraoxacyclononane. 100.
3,3,6,6,9,9-Hexamethyl-1,2,4,5- UN3105....... <=52..........
p-Menthyl hydroperoxide....... UN3105....... 72 ....... ....... ....... ............ OP7......... ........ .......... 13
- 100.
p-Menthyl hydroperoxide....... UN3109....... <=72.......... = OP7......... ........ .......... 5
peroxide(s). -=55. 8.
Methyl ethyl ketone UN3107....... <=40.......... = OP8......... ........ .......... 13
than 26% hydrogen peroxide. 27.
Peroxyacetic acid with not Exempt....... <=6........... ....... ....... ....... = Exempt...... ........ .......... 28
more than 20% hydrogen 60.
peroxide.
Peroxyacetic acid with not UN3109....... <=17.......... ....... ....... ....... ............ OP8, IBC.... ........ .......... 13, 20, 28
more than 26% hydrogen
peroxide.
Peroxyacetic acid with 7% UN3107....... <=36.......... ....... ....... ....... = OP8......... ........ .......... 13, 20, 28
hydrogen peroxide. 15.
Peracetic acid with 7% UN3107....... <=36.......... ....... ....... ....... = OP8......... ........ .......... 13
hydrogen peroxide. 15.
Peroxyacetic acid, type D, UN3105....... <=43.......... ....... ....... ....... ............ OP7......... ........ .......... 13, 20
stabilized.
Peroxyacetic acid, type E, UN3107....... <=43.......... ....... ....... ....... ............ OP8......... ........ .......... 13, 20
stabilized.
Peroxyacetic acid, type F, UN3109....... <=43.......... ....... ....... ....... ............ OP8, IBC.... ........ .......... 13, 20, 28
stabilized.
Peroxyacetic acid, distilled, UN3119....... <=41.......... ....... ....... ....... ............ Bulk........ +30..... +35....... 14, 27, 28
Type F, stabilized.
Pinanyl hydroperoxide......... UN3105....... 56-100........ ....... ....... ....... ............ OP7......... ........ .......... 13
Pinanyl hydroperoxide......... UN3109....... <56........... =8% 1-isopropylhydroperoxy-4-isopropylhydroxybenzene.
18. Addition of water to this organic peroxide will decrease its thermal stability.
19. [Reserved]
20. Mixtures with hydrogen peroxide, water and acid(s).
21. With diluent type A, with or without water.
22. With 36 percent, by mass, ethylbenzene.
23. With 19 percent, by mass, methyl isobutyl ketone.
24. Diluent type b with boiling point 100 C.
25. No ``Corrosive'' subsidiary risk label is required for concentrations below 56%.
26. Available oxygen must be <= 7.6%.
27. Formulations derived from distillation of peroxyacetic acid originating from peroxyacetic acid in a concentration of not more than 41% with water,
total active oxygen less than or equal to 9.5% (peroxyacetic acid plus hydrogen peroxide).
28. For the purposes of this section, the names ``Peroxyacetic acid'' and ``Peracetic acid'' are synonymous.
[[Page 542]]
(c) New organic peroxides, formulations and samples. (1) Except as
provided for samples in paragraph (c)(2) of this section, no person may
offer for transportation an organic peroxide which is not identified by
technical name in the Organic Peroxides Table of this section, or a
formulation of one or more organic peroxides which are identified by
technical name in that table, unless the organic peroxide is assigned a
generic type and shipping description and is approved by the Associate
Administrator under the provisions of Sec. 173.128(c) of this
subchapter.
(2) Samples. Samples of new organic peroxides or new formulations of
organic peroxides identified in the Organic Peroxides Table in paragraph
(b) of this section, for which complete test data are not available, and
which are to be transported for further testing or product evaluation,
may be assigned an appropriate shipping description for organic peroxide
Type C, packaged and offered for transportation, under the following
conditions:
(i) Data available to the person offering the material for
transportation must indicate that the sample would pose a level of
hazard no greater than that of an organic peroxide Type B and that the
control temperature, if any, is sufficiently low to prevent any
dangerous decomposition and sufficiently high to prevent any dangerous
phase separation;
(ii) The sample must be packaged in accordance with packing method
OP2, for a liquid or solid, respectively;
(iii) Packages of the organic peroxide may be offered for
transportation and transported in a quantity not to exceed 10 kg (22
pounds) per transport vehicle; and
(iv) One of the following shipping descriptions must be assigned:
(A) Organic peroxide Type C, liquid, 5.2, UN 3103;
(B) Organic peroxide Type C, solid, 5.2, UN 3104;
(C) Organic peroxide Type C, liquid, temperature controlled, 5.2, UN
3113; or
(D) Organic peroxide Type C, solid, temperature controlled, 5.2, UN
3114.
(3) Mixtures. Mixtures of organic peroxides individually identified
in the Organic Peroxides Table in paragraph (b) of this section may be
classified as the same type of organic peroxide as that of the most
dangerous component and be transported under the conditions for
transportation given for this type. If the stable components form a
thermally less stable mixture, the SADT of the mixture must be
determined and the new control and emergency temperature derived under
the provisions of Sec. 173.21(f).
(d) Packing Method Table. Packagings for organic peroxides and self-
reactive substances are listed in the Maximum Quantity per Packing
Method Table. The packing methods are designated OP1 to OP8. The
quantities specified for each packing method represent the maximum that
is authorized.
(1) The following types of packagings are authorized:
(i) Drums: 1A1, 1A2, 1B1, 1B2, 1D, 1G, 1H1, 1H2;
(ii) Jerricans: 3A1, 3A2, 3B1, 3B2, 3H1, 3H2;
(iii) Boxes: 4C1, 4C2, 4D, 4F, 4G, 4H1, 4H2, 4A, 4B; or
(iv) Composite packagings with a plastic inner receptacle: 6HA1,
6HA2, 6HB1, 6HB2, 6HC, 6HD1, 6HD2, 6HG1, 6HG2, 6HH1, 6HH2.
(2) Metal packaging (including inner packagings of combination
packagings and outer packagings of combination or composite packagings)
are used only for packing methods OP7 and OP8.
(3) In combination packagings, glass receptacles are used only as
inner packagings with a maximum content of 0.5 kg or 0.5 L.
(4) The maximum quantity per packaging or package for Packing
Methods OP1-OP8 must be as follows:
Maximum Quantity Per Packaging/Package for Packing Methods OP1 to OP8
----------------------------------------------------------------------------------------------------------------
Packing method
Maximum quantity -----------------------------------------------------------------------
OP1 OP2\1\ OP3 OP4\1\ OP5 OP6 OP7 OP8
----------------------------------------------------------------------------------------------------------------
Solids and combination packagings 0.5 0.5/10 5 5/25 25 50 50 \2\200
(liquid and solid) (kg)................
[[Page 543]]
Liquids (L)............................. 0.5 ....... 5 ....... 30 60 60 \3\225
----------------------------------------------------------------------------------------------------------------
\1\ If two values are given, the first applies to the maximum net mass per inner packaging and the second to the
maximum net mass of the complete package.
\2\ 60 kg for jerricans and 100 kg for boxes.
\3\ 60 L for jerricans.
(e) Bulk packagings for organic peroxides. The following bulk
packagings are authorized:
(1) Rail cars. Class DOT 103, 104, 105, 109, 111, 112, 114, 115, or
120 fusion-weld tank car tank are authorized. DOT 103W, 111A60F1 and
111A60W1 tank car tanks must have bottom outlets effectively sealed from
inside. Gauging devices are required on DOT 103W tank car tanks. Riveted
tank car tanks are not authorized.
(2) Cargo tanks. Specification MC 307, MC 310, MC 311, MC 312, DOT
407, and DOT 412 cargo tank motor vehicles with a tank design pressure
of at least 172 kPa (25 psig) are authorized.
(3) Portable tanks. The following requirements apply to portable
tanks intended for the transport of Type F organic peroxides or Type F
self-reactive substances. DOT 51, 57, IM 101 portable tanks, and UN
portable tanks that conform to the requirements of T23 (see Sec.
172.102(c)(7) of this subchapter), when T23 is specified in Column (7)
of the Sec. 171.101 Table of this subchapter for the Type F organic
peroxide or Type F self-reactive substance. Type F organic peroxide or
self-reactive substance formulations other than those indicated in T23
may be transported in portable tanks if approved by the Associate
Administrator. The following conditions also apply:
(i) The portable tank must be designed for a test pressure of at
least 0.4 MPa (4 bar).
(ii) Portable tanks must be fitted with temperature-sensing devices.
(iii) Portable tanks must be fitted with pressure relief devices and
emergency-relief devices. Vacuum-relief devices may also be used.
Pressure relief devices must operate at pressures determined according
to both the properties of the hazardous material and the construction
characteristics of the portable tank. Fusible elements are not allowed
in the shell.
(iv) The pressure relief devices must consist of reclosing devices
fitted to prevent significant build-up within the portable tank of the
decomposition products and vapors released at a temperature of 50 [deg]C
(122 [deg]F). The capacity and start-to-discharge pressure of the relief
devices must be in accordance with the applicable requirements of this
subchapter specified for the portable tank. The start-to-discharge
pressure must in no case be such that liquid would escape from the
pressure relief devices if the portable tank were overturned.
(v)(A) The emergency-relief devices may be of the reclosing or
frangible types, or a combination of the two, designed to vent all the
decomposition products and vapors evolved during a period of not less
than one hour of complete fire engulfment as calculated by the following
formula:
[GRAPHIC] [TIFF OMITTED] TN21JN01.003
Where:
q = heat absorption (W)
A = wetted area (m\2\)
F = insulation factor (-)
(B) Insulation factor (F) in the formula in paragraph (e)(3)(v)(A)
of this section equals 1 for non-insulated vessels and for insulated
vessels F is calculated using the following formula:
[GRAPHIC] [TIFF OMITTED] TN21JN01.004
Where:
U = K/L = heat transfer coefficient of the insulation
(W[middot]m-\2\[middot]K-\1\); where K = heat
conductivity of insulation layer
(W[middot]m-\1\[middot]K-\1\), and L = thickness
of insulation layer (m).
TPO = temperature of material at relieving conditions (K).
[[Page 544]]
(vi) The start-to-discharge pressure of emergency-relief devices
must be higher than that specified for the pressure relief devices in
paragraph (e)(3)(iv) of this section. The emergency-relief devices must
be sized and designed in such a way that the maximum pressure in the
shell never exceeds the test pressure of the portable tank.
Note to Paragraph (e)(3)(vi):
An example of a method to determine the size of emergency-relief
devices is given in Appendix 5 of the UN Manual of Tests and Criteria
(incorporated by reference, see Sec. 171.7 of this subchapter).
(vii) For insulated portable tanks, the capacity and setting of
emergency-relief devices must be determined assuming a loss of
insulation from 1 percent of the surface area.
(viii) Vacuum-relief devices and reclosing devices on portable tanks
used for flammable hazardous materials must be provided with flame
arresters. Any reduction of the relief capacity caused by the flame
arrester must be taken into account and the appropriate relief capacity
must be provided.
(ix) Service equipment such as devices and external piping must be
designed and constructed so that no hazardous material remains in them
after filling the portable tank.
(x) Portable tanks may be either insulated or protected by a sun-
shield. If the SADT of the hazardous material in the portable tank is 55
[deg]C (131 [deg]F) or less, the portable tank must be completely
insulated. The outer surface must be finished in white or bright metal.
(xi) The degree of filling must not exceed 90% at 15 [deg]C (59
[deg]F).
(xii) DOT 57 metal portable tanks are authorized only for tert-butyl
cumyl peroxide, di-(2-tert-butylperoxyisopropyl-benzene(s), dicumyl
peroxide and mixtures of two or more of these peroxides. DOT 57 portable
tanks must conform to the venting requirements of paragraph (e)(5) of
this section. These portable tanks are not subject to any other
requirements of paragraph (e) of this section.
(4) For tertiary butyl hydroperoxide (TBHP), each tank car, cargo
tank or portable tank must contain 7.6 cm (3.0 inches) low density
polyethylene (PE) saddles having a melt index of at least 0.2 grams per
10 minutes (ASTM D1238, condition E) as part of the lading, with a ratio
of PE to TBHP over a range of 0.008 to 0.012 by mass. Alternatively,
plastic or metal containers equipped with fusible plugs having a melting
point between 69 [deg]C (156 [deg]F) and 71 [deg]C (160 [deg]F) and
filled with a sufficient quantity of water to dilute the TBHP to 65
percent or less by mass may be used. The PE saddles must be visually
inspected after each trip and, at a minimum, once every 12 months, and
replaced when discoloration, fracture, severe deformation, or other
indication of change is noted.
(5) IBCs. IBCs are authorized subject to the conditions and
limitations of this section if the IBC type is authorized according to
Special Provision IB52 (see Sec. 172.102(c)(4) of this subchapter), as
applicable, and the IBC conforms to the requirements in subpart O of
part 178 of this subchapter at the Packing Group II performance level.
The additional requirements in paragraphs (e)(5)(i) and (e)(5)(ii) of
this section also apply. Type F organic peroxides or self-reactive
substances that are not authorized for a specific IBC may be transported
in IBCs other than those specified in IB52 if approved by the Associate
Administrator.
(i) IBCs shall be provided with a device to allow venting during
transportation. The inlet to the pressure relief device shall be sited
in the vapor space of the IBC under maximum filling conditions during
transportation.
(ii) To prevent explosive rupture of metal IBCs or composite IBCs
with complete metal casing, the emergency-relief devices shall be
designed to vent all the decomposition products and vapors evolved
during self-accelerating decomposition or during a period of not less
than one hour of complete fire-engulfment as calculated by the formula
in paragraph (e)(3)(v) of this section. The control and emergency
temperatures specified in IB52 are based on a non-insulated IBC.
[Amdt. 173-224, 55 FR 52643, Dec. 21, 1990]
Editorial Note: For Federal Register citations affecting Sec.
173.225, see the List of CFR
[[Page 545]]
Sections Affected which appears in the Finding Aids section of the
printed volume and on GPO Access.