Annex II of NR-19 - Tables of Quantities-Distances

SUMMARY

Initial considerations
Tables

1. Initial considerations

1.1 In the organization of the presented tables, explosives and accessories whose trade is allowed have been grouped into classes so that those presenting similar risks belong to the same classification.

1.2 The distribution into classes does not imply storing the elements of the same class together. Compatibility between them must be observed.

1.3 The classification into classes is not only intended to establish the minimum permitted distances between warehouses or between warehouses, inhabited buildings, highways, and railways.

1.4 The distances and quantities provided in the tables aim to ensure personal and material protection in the vicinity of the warehouses and mitigate the damage caused by a possible accident.

1.5 The distances provided in the tables depend not only on the total quantity of the material stored but also on the range of the fragments.

1.6 For barricaded or entrenched warehouses or workshops, the provided distances can be reduced by half, all depending on the site inspection.

2. Tables

2.1 High Explosives

In general, they comprise materials that can be detonated by a common detonator when not confined, that is, they release their energy as rapidly as possible, exhibiting supersonic burn rates and producing the necessary destructive effects through the formation of shock waves and the expansion of high-temperature gases resulting from exothermic chemical decomposition reactions. They are intended to produce destructive work by the action of the gases and the shock wave produced when they transform by detonation. They are called secondary explosives because they require the detonation wave of another explosive to be initiated. For products classified as high explosives, the distances in Table 3 should be applied.

2.2 Low Explosives

In general, they comprise materials that produce hot gases without the formation of a shock wave and release energy through deflagration when confined, that is, they exhibit subsonic burn rates driven by the progressive heat transfer effect, so that this gas expansion exerts pressure that can be harnessed to generate controlled thrust, giving rise to ballistic propulsion effects. For products classified as low explosives, the distances in Table 1 should be applied.

2.2.1. Chemical Powders (single, double, and triple base)

These products deteriorate due to moisture, high temperature, and age; they burn producing intense heat without fragments or pressures capable of causing serious damage. Table 1 should be applied for their storage, except when classified as flammable solids as described in subitem 19.5.5 of this standard. In this case, the main risk is fire, and there is no need for a special distance table.

2.3. Explosive Initiators

In general, they comprise extremely sensitive energetic materials that can be initiated by friction, mechanical shock, heat, or electric spark, which decompose by detonation and are primarily intended to initiate less sensitive explosives. For products classified as explosive initiators, the distances in Table 2 should be applied.

2.4. Chemical products used as raw materials or intermediates in the manufacture of explosive mixtures.

This category includes potassium chlorate, dinitrotoluene, base emulsion or pre-emulsion, ammonium nitrate, ammonium perchlorate, potassium perchlorate, and others that only detonate under special conditions:

a) when the stored products present only the risk of fire, the distances in Table 1 should be applied; and

b) when the products are stored close to other materials with which they can form explosive mixtures, the distances between warehouses must comply with those in Table 3, while the other distances (habitations, highways, and railways) remain those in Table 1.

2.5. Pyrotechnic Devices

a) when they present a risk of mass explosion or projection, they should be stored applying Table 3;

b) when there is only a fire hazard with a small risk of explosion, Table 4 should be applied; and

c) when there is no significant risk and in the event of initiation their effects are confined predominantly to the packaging and do not project appreciable fragments over long distances, they should be stored according to Table 1.

Table 1

Net Weight (kg)		Minimum Distances (m)
From	To	Inhabited Buildings	Railways	Highways	Between Warehouses or Workshops
0	450	25	25	25	15
451	2,250	35	35	35	25
2,251	4,500	45	45	45	30
4,501	9,000	60	60	60	40
9,001	18,100	70	70	70	50
18,001	31,750	80	80	80	55
31,751	45,350	90	90	90	60
45,351	90,700	115	115	115	75
90,701	136,000	110	110	110	75
136,001	181,400	150	150	150	100
181,401	226,800	180	180	180	120

Notes:

1. The maximum permissible quantity in one location is 226,800 kg.

2. The maximum permissible quantity of agricultural grade ammonium nitrate in one location, intended for the manufacture of fertilizers, and the storage conditions will be established in supplementary legislation.

Table 2

Net Weight (kg)		Minimum Distances (m)
From	To	Inhabited Buildings	Railways	Highways	Between Warehouses or Workshops
0	20	75	45	22	20
21	100	140	90	43	30
101	200	220	135	70	45
201	500	260	160	80	65
501	900	300	180	95	90
901	2,200	370	220	110	90
2,201	4,500	460	280	140	90
4,501	6,800	500	300	150	90
6,801	9,000	530	320	160	90

Note: The maximum permissible quantity in one location is 9,000 kg.

Table 3

Net Weight of Material (kg)		Distances (m)
From	To	Inhabited Buildings	Highways	Railways	Between Warehouses or Workshops
0	20	90	15	30	20
21	50	120	25	45	30
51	90	145	35	70	30
91	140	170	50	100	30
141	170	180	60	115	40
171	230	200	70	135	40
231	270	210	75	145	40
271	320	220	80	160	40
321	360	230	85	165	40
361	410	240	90	180	44
411	460	250	95	185	50
461	680	285	100	195	60
681	910	310	110	220	60
911	1,350	355	120	235	70
1,351	1,720	385	130	255	70
1,721	2,270	420	135	270	80
2,271	2,720	445	145	285	80
2,721	3,180	470	150	295	90
3,181	3,630	490	150	300	90
3,631	4,090	510	155	310	100
4,091	4,540	530	160	315	100
4,541	6,810	545	160	325	110
6,811	9,080	595	175	355	120
9,081	11,350	610	190	385	130
11,351	13,620	610	205	410	140
13,621	15,890	610	220	435	150
15,891	18,160	610	230	460	160
18,161	20,430	610	240	485	160
20,431	22,700	610	255	505	170
22,701	24,970	610	265	525	180
24,971	27,240	610	275	550	180
27,241	29,510	610	285	565	190
29,511	30,780	610	295	585	190
31,781	34,050	610	300	600	200
34,051	36,320	610	310	615	210
36,321	38,590	610	315	625	210
38,591	40,860	610	320	640	220
40,861	43,130	610	325	645	220
43,131	45,400	610	330	655	230
45,401	56,750	610	330	660	260
56,751	68,100	610	345	685	290
68,101	79,450	610	355	710	320
79,451	90,800	620	370	735	350
90,801	102,150	640	380	760	380
102,151	113,500	660	390	780	410

Note: The maximum permissible quantity in one location is 113,500 kg.

Table 4

Net Weight of Material (kg)		Distances (m)
From	To	Inhabited Buildings	Railways	Highways	Between Warehouses or Workshops
0	180	61	61	31	21
181	270	64	61	31	21
271	360	77	61	31	21
361	450	89	61	31	24
451	900	140	71	36	30
901	1,360	181	91	46	30
1,361	1,810	215	108	54	36
1,811	2,260	244	122	61	43
2,261	2,720	269	135	66	45
2,721	3,620	311	156	78	82
3,621	4,530	345	173	87	58
4,531	6,800	407	204	102	68
6,801	9,070	455	228	114	76
9,071	13,600	526	264	132	88
13,601	18,140	581	291	146	97
18,141	22,670	628	314	157	105
22,671	27,210	668	334	167	111
27,211	36,280	735	368	184	123
36,281	45,350	793	397	198	132
45,351	68,020	907	454	227	151
68,021	90,700	999	500	250	167
90,701	113,370	1,076	538	269	179

Note: The maximum permissible quantity in one location is 113,370 kg.