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Started: 9/19/2019 11:31 AM
Picture Placeholder: JOSHUA WUSTNER
JOSHUA WUSTNER
How to address "Corner Clips" for Grandfathered Earth Covered Magazines - COAs

Background:   

Prior to 1967 the “front” sector of an Earth-Covered Magazines (ECM) was measured from the center of the headwall. Magazines were constructed based on this assumption.

Pre-1967.png

Now, the front exposure arc originates inside the magazine, intersecting at the Headwall & sidewall (the arc is widened).  Now the canted magazines have a Side to Front exposure by a thin margin.

Corner clips.png

This increases the inter-magazine (IMD) distance required, increases the required K factor, thus requiring drastically reduced storage limits in some cases.

 

COAs:

 

  1. Reduce the limits based on the Front to Side exposure.
  2. Modify criteria (DESR, OP 5, etc.) to allow for a small Front to Side clip to be considered a Side to Side exposure.  How small is small?  Less than 5% of the sidewall sees the front exposure arc?  Modify ESS programming?
  3. Deviations on a case by case basis, using submittal notes in ESS.

 

What are your thoughts?

Picture Placeholder: JOSHUA WUSTNER
  • JOSHUA WUSTNER
/_layouts/15/images/person.gif" alt="Picture Placeholder: JOSHUA WUSTNER" />
JOSHUA WUSTNER

Background:   

Prior to 1967 the “front” sector of an Earth-Covered Magazines (ECM) was measured from the center of the headwall. Magazines were constructed based on this assumption.

Pre-1967.png

Now, the front exposure arc originates inside the magazine, intersecting at the Headwall & sidewall (the arc is widened).  Now the canted magazines have a Side to Front exposure by a thin margin.

Corner clips.png

This increases the inter-magazine (IMD) distance required, increases the required K factor, thus requiring drastically reduced storage limits in some cases.

 

COAs:

 

  1. Reduce the limits based on the Front to Side exposure.
  2. Modify criteria (DESR, OP 5, etc.) to allow for a small Front to Side clip to be considered a Side to Side exposure.  How small is small?  Less than 5% of the sidewall sees the front exposure arc?  Modify ESS programming?
  3. Deviations on a case by case basis, using submittal notes in ESS.

 

What are your thoughts?

19/19/2019 11:31 AM9/19/2019 11:31 AMNoAsk the Community
50.8761702358175
9/19/2019 7:39 AM
Edited: 10/15/2019 9:55 AM
Picture Placeholder: JULIE PORTER
JULIE PORTER

​​​​​​​Mr. Wustner,

If you are hunting for an immediate solution, I believe you have two options. ​​ The first option is to reduce the net explosive weight limit in the magazine, which is the most correct.  The second option is to submit a deviation with the site plan. Often times, the magazine will cube out before the sited net explosive weight is achieved. 

 

Picture Placeholder: JULIE PORTER
  • JULIE PORTER
/_layouts/15/images/person.gif" alt="Picture Placeholder: JULIE PORTER" />
JULIE PORTER

​​​​​​​Mr. Wustner,

If you are hunting for an immediate solution, I believe you have two options. ​​ The first option is to reduce the net explosive weight limit in the magazine, which is the most correct.  The second option is to submit a deviation with the site plan. Often times, the magazine will cube out before the sited net explosive weight is achieved. 

 

JOSHUA WUSTNER77010/15/2019 9:54 AM10/15/2019 9:55 AM
2/2/2018 11:47 AM

 

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