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Warehouse and DC Retrofits: Wet Seal’s slick transformation

With a bit of creativity, a lot of planning, and the latest in automated sortation technology, the retailer’s impressive DC retrofit increased merchandise-processing speed to its stores, improved accuracy to 99.5 percent, and significantly reduced transportation costs.
By Maida Napolitano, Contributing Editor
March 01, 2012

Out with the old
In 2007, Wet Seal’s team started discussions with system integrators and vendors to see what options were available to them. Early on, they knew that an automated unit-sortation system would best fit their needs.

These systems are typically made up of individual trays that hold a unit of an item. The trays circulate over a horizontal plane and, depending on the tray mechanism, sort each unit to its proper destination. Most use a “bomb bay” tray mechanism where trays open in the middle—similar to airplane bomb bay doors—and drop each piece into outbound shipping cartons designated for a particular store.

In early 2008, after much due diligence, Wet Seal’s team decided on the SORTRAK—a flexible unit sortation system offered by the SDI Group USA, a California-based systems integrator. “We chose SDI because they had a split tray system,” says Torok. “It basically doubles the capacity of the bomb bay drop.” A unit placed on the front part of the tray can have a different destination from a unit placed on the back part of the tray. As a result, users can put one large item on both trays or two smaller items on a split tray, and it would drop with the same accuracy. 

The SORTRAK also had some unique properties that worked to Wet Seal’s advantage especially with the limited available space. “The typical bomb bay sorter can only go on one plane,” explains Mary Adams, SDI’s CEO and this project’s lead manager. “With this sorter, we are able to stack them and intertwine them and get more store sort destinations within a smaller footprint.”

By the fall of 2009, final plans were in place and both Wet Seal and SDI were ready to move.

Mechanical installation began in early 2010. The existing carousel system continued to operate, while the first two sorters were being installed adjacent to it. They then gradually moved one product category at a time to the new sorters, before the old carousel system was completely removed to make room for yet another sorter. 

Simultaneous to the mechanical install was the integration between Wet Seal’s order management system and the new sortation system. IT and operations personnel went offsite for about a week and trained and tested the new system, passing real files back and forth.

Because it had to install the sorters in phases, in limited space, on a mezzanine, and with no disruptions to existing operations, SDI’s Adams says the installation took about 7 months. “If it were a greenfield building, we probably could have had it done in three months.”

By July 2010, all three sorters were operational. “SDI was a great partner, and the system is now exceeding our expectations,” says Torok.

System in action

The majority of the product is received in standard vendor cartons on pallets. The pallets are vertically transported via lift truck to a pallet staging area on the mezzanine. Workers then take the cartons off the pallet onto processing lines to see if any value-added service will be required. 

Cartons are then transported to one of three sorters. Each carton that comes to the sorter is SKU specific—the same SKU is in that box. At each sorter, the units can be inducted in any one of six stations. At induction, a worker scans the first SKU, opening up a demand file. He puts one (or two units) on each tray as it goes by until the carton is empty. 

The system detects that a unit is on a tray, counts it, and transports it to the appropriate store destination where it drops the piece to a waiting outbound store carton. Once a store carton is full it’s pushed to a center conveyor and travels to taper and print-and-apply stations before being conveyed and sorted to shipping lanes at the dock.

Reaping benefits of a retrofit

With the implementation of the new system, Torok says that the benefits keep rolling in. The DC has been able to streamline both its receiving and shipping functions, while piece-counting inbound merchandise has been eliminated, as the system automatically counts each piece as it is inducted into the sorter. 

As a result, receiving went from a two-shift to a one-shift operation. The shipping shift has also been reduced from a 16-hour to a 12-hour total shift, and labor in each of these areas has been reduced by 25 percent.

In the old system, it used to take 4 days to 5 days for product to ship out from when it hits the DC. As a result, they needed to use expensive three-day air service to get merchandise to stores on time. But because most of the orders are now turned in less than 24 hours, all outbound cartons can now be shipped UPS ground at half the cost, with the exception of California and Arizona, where regional carriers are able to provide next day service at a very low cost. 

The new system is also able to track the contents in each shipping carton down to the SKU level. In the meantime, accuracy has improved from about 92 percent to over 99.5 percent. “We estimated an ROI of about 3.5 years. It’s turning into an ROI of 2.5 years,” says Torok.

Both Torok and Adams agree that the secret to the project’s success was planning.  “Planning and having redundancy is very important when adding any new technology and process,” says Torok. “We were able to continue fulfillment with our old systems right up to the day we turned on the new sortation system.”

“Plan, then plan again,” emphasizes Adams. “Throughout the whole retrofit design process you want to anticipate where the fail points could be and plan for them.” 


About the Author

Maida Napolitano
Contributing Editor

Maida Napolitano has worked as a Senior Engineer for various consulting companies specializing in supply chain, logistics, and physical distribution since 1990. She’s is the principal author for the following publications: Using Modeling to Solve Warehousing Problems (WERC); Making the Move to Cross Docking (WERC); The Time, Space & Cost Guide to Better Warehouse Design (Distribution Group); and Pick This! A Compendium of Piece-Pick Process Alternatives (WERC). She has worked for clients in the food, health care, retail, chemical, manufacturing and cosmetics industries, primarily in the field of facility layout and planning, simulation, ergonomics, and statistic analysis. She holds BS and MS degrees in Industrial Engineering from the University of the Philippines and the New Jersey Institute of Technology, respectively. She can be reached at .(JavaScript must be enabled to view this email address).

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