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Quantity Distances

Quantity Distances. Definitions. Potential Explosive Site – PES Exposed Site – ES Separation Distance Quantity Distance – QD Inside Quantity Distance – IQD Outside Quantity Distance - OQD. MA04 Slide 2. Measurement of Quantity Distances. House 1. School 1. School 2. 220m. 380m.

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Quantity Distances

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  1. Quantity Distances

  2. Definitions • Potential Explosive Site – PES • Exposed Site – ES • Separation Distance • Quantity Distance – QD • Inside Quantity Distance – IQD • Outside Quantity Distance - OQD MA04 Slide 2

  3. Measurement of Quantity Distances House 1 School 1 School 2 220m 380m 100m PES 300m House 2 120m House 4 390m House 3

  4. Unitisation • Highly complex issue • Be aware of it though • Use of amended Quantity Distances possible • Seek specialist ammunition technical advice

  5. Aggregation of Net Explosive Quantity (NEQ)

  6. Aggregation of Hazard Divisions 1.4, 1.5 and 1.6 HD 1.4: Separation distances based on fire risks HD 1.5: Treat as 1.1 for flexibility HD 1.6: See NATO Publication AASPT-1

  7. Inside Quantity Distances Outside explosive facility Site perimeter Inside explosive facility PES Internal Quantity Distance (IQD) ES

  8. Outside Quantity Distances ES Outside explosive facility Outside Quantity Distance (OQD) Site perimeter Inside explosive facility PES ES

  9. Types of Outside Quantity Distances • Inhabited Building Distance (IBD): • PES to sites where the general public, or workers not directly associated with the explosives facility, live, work or congregate • Intended to prevent serious structural damage to ‘traditional’ types of building • No direct injury to people in the open from blast/heat • Some injury possible from fragmentation

  10. Types of Outside Quantity Distances • Vulnerable Building Distance (VBD): • Used for an inhabited building which is of ‘vulnerable construction’, such as a glass façade • A large facility of special importance, such as a school or hospital • Normally twice the distance of the IBD

  11. Types of Outside Quantity Distances • Public Traffic Route Distance (PTRD): • Roads and railways • Waterways, including rivers, canals and lakes • Airport buildings and facilities (unless ‘vulnerable’) • Public rights of way (e.g. footpaths)

  12. The Explosive Limit License (ELL) - Background • Each PES will be licensed-therefore each PES has an ELL • The ELL states maximum NEQ to be stored in a given PES • The ELL has a table to show how the limits were derived • The table uses ‘pictograms’ to denote different types of structure, and the Quantity Distance between each type

  13. Pictograms

  14. Worked Example (Top View) Quantity Distance APB IGLOO (Pictograms)

  15. Quantity Distances: Mini-Exercise Nearest residential house (Top View) Perimeter of site ESH 3 ESH 1 Traverse ESH 2

  16. Questions

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