navicon

13 22 54

What is Double-Deep Racking - Warehouse Racking Guide: Part 3

Filed under: Warehouse Racking

What is Double-Deep Racking? Part 3 of this guide focuses on the basics of Double-Deep Racking. We will look at the key features of double deep racking & analyse the key advantages and disadvantages.

Remember before purchasing warehouse racking talk to your forklift provider. They will be able to provide you with expert knowledge on layout and what equipment and racking will suit your needs best.

pantograph reach truck

Double Deep is similar to selective racking; but pallets are now stored two rows deep instead of one. This type of racking therefore requires specialised pallet handling equipment using ether a specialised forklift or a standard unit a with double deep handling attachment.

The most common forklift used for double-deep handing is a reach truck. One key disadvantage with reach trucks is that they require a counterbalance for loading and unloading the pallet onto trucks, which can double capital investment requirements for your pallet handling equipment.

Another Option is articulated forklifts which are able to work in double deep narrow aisles while still doing the job of a counter balance.

Double Deep: Pallet Handling Options

Hydraulic/Telescopic Attachments:

Perfect for handling Double-deep racking; this attachment allows any non-pantograph forklifts to be used to handle double deep pallet racking. Hydraulic pumps move the forks/tynes in or out; controlled by the forklift operator, allowing stock to be placed into the second row of a double deep racking system.

Advantages

  • Lowers capital investment compared to scissor & pantograph masts.
  • Reduces required aisle width when compared to manual fork extensions
  • Increases handling of pallets and reduces stock damage compared to manual fork extensions.
  • Clear visibility, no extra obstructions because of all extra moving parts of the scissor reach system.

Disadvantages

  • Reduces forklift lifting capacity

hydraulic_fork_attachment_example

Pantograph/Scissor mast trucks:

Pantographic reach trucks are dedicated trucks designed for double deep pallet stacking. They ensure faster operating times compared to hydraulic fork attachments

Advantages

  • Reduced aisle-widths
  • Faster pallet handling times.
  • Reduces pallet damage, due to smoother operation

Disadvantages

  • Requires Counter-balance trucks for unloading and loading freight trucks.
  • Reduced visibility when compared to Hydraulic forks.
  • High capital investment

pantograph_sissor_mast

Layout

Double-Deep Racking is two pallet deep configuration pallet racking. This means a maximum of four rows can be placed back to back.

double deep racking diagram

(See Double-Deep Layout Diagram – Counter-Balance vs Reach Truck vs. Articulated)

Pallet Access (LIFO)

Double-Deep is Last In First Out (LIFO). This type of racking reduces the amount of accessible stock keeping units (SKU’s) due to 50% of SKU’s being behind pallets when storage locations are at full capacity. Can increase pallet storage by as much as 10-15% depending on racking layout.

Double-deep is better suited to stock that has a medium to long term shelf life. Highly perishable goods aren’t recommended for this style of racking due to LIFO racking type.


Douple-Deep Racking Advantages & Disadvantages

Advantages

  • Increased storage capacity compared with Selective Racking
  • Medium to low storage system.
  • Can increase pallet storage by as much as 10-15% depending on racking layout.

Disadvantages

  • Reduced SKU’s accessibility
  • LIFO inventory management.
  • Special trucks required.

Forklift Racking application guide:

Counter-Balance

  • Aisle widths – 3.8 to 5.5m (Wide aisles)
  • Storage area – 45%
  • Operating aisle area – 55%
  • Lift height – up to 8m

Reach Trucks

  • Aisle widths – 3.0 to 3.5m (medium aisles)
  • Storage area – 55%
  • Operating aisle area – 45%
  • Lift height – up to 11.4m

Articulated Forklifts

  • Aisle widths – 1.8-2.2m (narrow aisles)
  • Storage area – 65%
  • Operating aisle area – 34%
  • Lift height – up to 12m

Did you find this blog post useful?

Why not subscribe to our Blog? Don't forget to,
this article too so others can find it! Thanks for reading.

Next entry: Double Deep Racking - Layout Diagram Example

Previous entry: What is a Supply Chain Network?

6 comments

Hi, this blog is really instructive. I would like to know more about this.
Metalshelvings.com is a top supplier of pallet racks, industrial pallet racking, pallet storage racks, supermarket racks and heavy duty racks.

archipporizzo
January 14, 2012 - 2:37 pm

Thanks a lot for providing the nice info in this website.
   

Sylvia Wells
March 06, 2012 - 10:27 pm

Great info thanks for sharing it.

martinjhon
March 15, 2012 - 8:05 pm

Hi, I really appreciate your blog. Great!!!!!!!!!!

pallet rack
April 22, 2012 - 11:48 pm

Hi,

I don’t agree on the part about the Pantograph/Scissor mast trucks where you state they ensure faster operating times compared to hydraulic fork attachments. When it concerns warehouse applications e.g. double deep storage, a one-cylinder hydraulic fork is used and in that case the handling speed is the same!

Could you also explain to me why Pantograph/Scissor mast trucks should reduce pallet damage?

MSE-FORKS
January 30, 2013 - 12:10 am

It is really useful data . Thanks a lot

Priyesh Kuniyil
April 12, 2016 - 4:41 pm

Leave a comment