FAQs About Our Storage Materials and Installation Service
Frequently Asked Questions
What determines the amount that a braced column section will bend when a load is applied is called the moment of inertia. It is expressed with reference to the bending axis, and in forklift impact, deeper columns will have much greater bending resistance. Column depths more important than the material thickness or the column width, and as a result, if a structural and roll formed column of equivalent capacities have these loadings applied, the structural will temporarily bend, or deflect, up to seven times as much as would the roll formed section. In terms of failure caused by overload, this relationship holds. A roll formed column of an equivalent capacity is approximately four times as strong in failure as the structural section, meaning that the structural column will tolerate only one-quarter of the force of the roll formed column before the deflection above becomes permanent deformation. It is obvious that that the roll formed column dents more easily than the structural, it isn’t considered “damaged” until significant deformation of the material has occurred. Because of its inherent advantages over structural, it would take significant damage of the roll formed column before it would be brought to the same weakness level as the structural column. This is a huge surprise to many of our customers because they have experience with denting only, and have never really experienced rack failure. To sum it all up, Structural is designed to hold more weight, but is more likely to fail with permanent damage if hit. Racking failure should be of greater concern and the safety hazards it represents.
Closed sections have certain structural advantages, but not in the area of impact resistance. The moment of inertia about the bending axis in a frontal impact situation for a closed section column and an open section column are virtually identical, so their bending resistance levels are equivalent. In fact, if all else is equal, because of the structural advantages of closed sections, a closed section column of a given load-carrying ability will have a thinner wall than will an open column of the same load-carrying ability. This would decrease impact resistance. Only if the capacity of the closed section is greater (or thicker) would you gain any structural advantage - but this holds true when comparing almost any two columns. We don’t see many manufacturers produce this shape because of usability. Attachment of accessories is much more difficult with closed sections, because through-bolts would have to be used, and proper tightening without column crushing would be a problem without a special type of fastener. Also, accessories attached in opposition (on each side of the column) can create an attachment problem. Because of these problems and the fact that there are no real advantages, very few companies still offer closed roll formed column sections.
Rack Manufacturers Institute (RMI) A Firm put together in 1997 to assure customers that manufacturers or producing up to code materials.
The following clear aisles are required for the associated lift equipment. Keep in mind, this is WSN’s suggested aisle widths. Prior to purchasing any materials or lifts, confirm the data with your supplier.
Sit Down counterbalanced Lifts typically require a 12’ aisle. A Wave order picker is 3’ clear. Stand Up Single Reach Truck is 8’6”. Stand Up Double Reach Truck is 9’ spacing. (NAOP) Narrow aisle order pickers are 5’ clear. Turret Trucks are 5’6”.
Racks must be structurally attached to the following if the overall height from the floor to the top load beam exceeds six (6) times, but no more than eight (8) times the depth of the frame. Example: 42” deep frame with top load beam at 288” = 6.86 to
- Chose from the list below.
A. Replace standard frame footplates with oversized seismic footplates requiring two (2) anchors per footplate or four (4) anchors per frame.
B. Tie frames to a concrete wall using wall ties that do not exceed 10’-0” (vertically) from each other.
C. Tie frames to adjacent row frame using cross aisle ties.
D. Tie frames to another row (create back to back row) using row spacers that do not exceed 10’-0” (vertically) from each other.
Any System that is in Seismic Zones 2A, 2B, 3, or 4 with loads above 8’-0” must be designed to resist seismic forces. Special requirements will have to be met in order to achieve compliance in your local municipalities. Prior to designing a Seismic Zone System, an analysis must be performed by a seismic engineer to determine the exact materials that will be required in the System. You will need to fill out the engineering worksheet to get preliminary calculations from WSN.
PROCEDURE TO OBTAIN PALLET RACK PERMITS
HAVE LAYOUT AND MATERIAL DETAIL SHEET APPROVED BY CUSTOMER
WITH ENGINEERING WORKSHEET FILLED OUT
SUBMIT INFORMATION TO WASHINGTON STATE LISCENSED ENGINEER
TO HAVE STRUCTURAL CALCULATIONS PERFORMED
AFTER HAVING THE STAMPED CALCULATIONS, FLOOR PLANS AND DETAIL SHEET RETURNED FROM THE ENGINEER. THEY WILL BE SUBMITTED TO THE CITY FOR PERMIT.
THERE ARE TWO FACTIONS OF THE CITY THAT WILL BE REVIEWING THE PERMIT. ONE IS THE BUILDING DEPARTMENT. THEY WILL REVIEW THE SEISMIC CALCULATIONS AND ANY OTHER STRUCTURAL RELATED ISSUES.
THE OTHER IS THE FIRE DEPARTMENT, WHICH WILL REVIEW THE COMMOITY STORED IN RELATION TO THE STYLE AND DESIGN OF THE SPRINKLER SYSTEM. THEY WILL ALSO LOOK AT EGRESS PATHS OUT OF BUILDING, AND ANY OTHER LIFE/ SAFETY ISSUES.
AFTER WE RECEIVE THE APPROVED PERMIT BACK FROM THE CITY
WE ARE ABLE TO START THE BUILDING PROCESS. UPON COMPLETION OF
BUILDING THE RACK SYSTEM, THERE WILL BE A BUILDING INSPECTION, AND A FIRE INSPECTION WITH THE RACKS EMPTY, AND IN CERTAIN CIRCUMSTANCES THERE CAN BE A COMMONITY INSPECTION ALSO.
ONCE EVERBODY HAS SIGNED OFF, THE RACKS ARE APPROVED FOR LOADING.
THIS IS A VERY BRIEF DESCRIPTION ON THE PERMITTING PROCESS
After we have decided on a functional System, the local ordinances will require the following information at the time of plan review.
- The physical address of where the System is to be installed.
- The complete floor plan layout (preferably an AutoCAD file) of the entire facility that includes dimensions of aisle widths and distances from permanent structures.
- Pallet and load data that will be stored in the System:
- Pallet depth and width.
- Load depth, width, and overall height (including the pallet).
- Maximum and average weights.
- Maximum and average utilization of the pallets stored.
- Carton data that will be stored in the System:
- Carton depth, width, and height.
- Maximum and average utilization of the cartons stored.
- Maximum and average weights.
- Floor slab thickness and concrete strength in pounds per square inch (PSI).
- Soiling bearing pressure in pounds per square foot (PSF).
- Drawings that indicate the maximum and average weights to be stored in the Rack System, the model numbers for each segment of the Rack System, and an elevation view of each segment of the Rack system.
- Calculations noting the approved materials that are to be used in the Rack System.
- Attachment method details of the Rack System that indicate the anchor size, quantity, and embedment per frame.
- Drawings, calculations, and details that have a wet seal and signature accepting compliance by a registered Professional Engineer (normally from the state where the rack is to be installed).
The following budget prices include these following assumptions:
- Prices include Materials , Freight, plus Installation and Project Management Services. Note: Sales/Use Taxes are not included.
- Prices include floor positions for the Selective Rack and Drive-In Rack Systems.
- Pallets are to be 48” deep x 40” wide with a maximum load of 2,500 pounds.
- Cartons are to be 20” deep x 15” wide with a maximum load of 40 pounds.
- Prices for the Selective Rack, Drive-In Rack, Double Deep Rack, Push Back Rack, and Pallet Flow Rack assume 4 pallet levels high per bay.
- Prices for the Narrow Aisle Rack assume 8 levels high per bay with wire decks.
- Prices for the Carton Flow Rack assume 4 levels high with 4-6 lanes per bay.
Keep in mind, prices will very quite a bit depending on available new and used components. Also remember Seismic Zones will always cost more.
Static Rack Systems Price Per Pallet
Selective Rack System $30.00 - $45.00
Add for Cross Bars $10.00 - $14.00
Add for Wire Decks $16.00 - $22.00
Drive-In Rack System $60.00 - $85.00
Double Deep Rack System $60.00 - $90.00
Narrow Aisle Rack System $1,300.00 - $1,900.00 (Price Per Bay)
Cantilever Rack System (Single-Sided) $1,000.00 - $1,500.00 (Price Per Bay)
Cantilever Rack System (Double-Sided) $1,500.00 - $1,900.00 (Price Per Bay)
Dynamic (Flow) Rack Systems Price Per Pallet
Push Back Rack System $85.00 - $160.00
Pallet Flow Rack System $150.00 - $350.00
Carton Flow Rack System (Plastic Wheel) $1,050.00 - $1,500.00 (Price Per Bay)
Carton Flow Rack System (Span-Track) $1,500.00 - $2,000.00 (Price Per Bay)
Shelving Systems Price Per Bay
Shelving System (Open Type) $95.00 - $180.00
Shelving System (Closed Type) $150.00 - $260.00
Mezzanine Systems Price Per Sq. Foot
Mezzanine System $14.00 - $25.00
A starter bay is a full bay of pallet rack consisting of 2 frames (or uprights) and a chosen amount of beams and decks. An add on bay is the connecting bay to the starter with 1 frame and a chosen amount of beams and decks.