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Transportation Safety Time

Gina Mastrosimone

A late delivery of one part number may not impact Production Schedule. Sometime it is possible to expedite receiving, inspection and line feeding operations to protect Production. However if a truck with a lot of part numbers is late, speeding-up all these operations for all parts could be a real challenge.

It means that a late arrival of an order can be a major factor of disruption.

2 solutions exist to protect Production:

The first one means that you accept the fact that the delivery can be delayed and you have a safety stock within your plant to protect the Production Schedule.
The second one means that you are slowing down your transportation and so increasing your transit-time to be sure that the delivery will be always on time.

DST and STT increase your inventory but in 2 different ways:

  • DST increases your in-house inventory;
  • STT increases your in-transit inventory, maybe transportation cost (you hold transportation resources for a longer period of time) but requires no extra storage space in your plant.

It is sometime possible to eliminate TST by choosing the right arrival time based on production or receiving hours. A transportation delays analysis is always necessary to define the right TST. The choice of using DST or STT is part of the transportation cost and inventory optimization.

TST calculation The best way to calculate a TST is to analyse the history of transportation arrival time.

Safety Transit Time (STT) Safety Transit Time impact the transportation route or/and its transit time.

Delivery Safety Time (DST) Delivery Safety Time has to cover the maximum delay of an order.

Learn more...

Optimizing TST of a 3740 km milkrun A real example showing how you can optimize the TST and its cost.

TST : Think globaly You may not need to secure your transportation if you are the only one to do it!

Eliminating TST based on receiving hours An analysis of truck arrivals and receiving schedule may help to optimize your TST.

Using TST for weather events A classical example used by a lot of companies during winter.

Eliminating TST based on production hours An analysis of truck arrivals and consumption schedule may help to optimize your TST.

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