Update of quantity
Please note, the order volume has been updated. This is due to package and minimum order quantities.
Please note, the order volume has been updated to. This is due to package and minimum order quantities.
Please note, the order volume has been updated. This is due to package and minimum order quantities.
Please note, the order volume has been updated to. This is due to package and minimum order quantities.
Ideal for corrosive environments, such as the energy and industry sector.
When you think that your medium-to-large project may need as many as 100,000 fastenings to attach components to structural steel, a faster method for corrosion-resistant fastenings would seem long overdue.
With such volumes, design engineers and contractors working in corrosive environments – like oil & gas, petrochemical, and power & utilities projects – would welcome faster and more efficient ways of fastening components to structural steel. As an additional challenge, the components – such as grating, strut, conduit, cable trays, pipes, electrical boxes, supports for instrumentation panels, etc. – and the fasteners are often exposed to harsh weather, pollution and coastal environments, therefore requiring corrosion protection.
The structural steel may be hot-dip galvanized or coated with paint to help provide adequate corrosion protection depending on the specific environment. However, when fastening components, design engineers and contractors must ensure the corrosion protection of the structural steel is not compromised. The traditional fastening methods used under these conditions include welding, through-bolting and clamping. In this editorial we will compare these with the Hilti methods for fastening on steel and show how Hilti can help save you both time and money.
Corrosion is the physicochemical interaction between a metal and its environment, which results in changes in the metal’s properties and may lead to significant functional impairment of the metal, the environment, or the technical system of which they form a part (see ISO 8044:2010).
In construction and engineering corrosion may have a major impact on structures and fastenings made of metals such as carbon steel, stainless steel, zinc, copper and aluminum. It is estimated that roughly one fifth of the world’s annual steel production is to replace parts damaged by corrosion. While this amounts to a considerable economic loss, a greater concern is the safety risks, where corrosion may lead to failure in a fastening system.
Hilti offers a variety of methods customized to various corrosive environments that help reduce or eliminate the drawbacks of traditional methods. Depending on the corrosive environment and type and thickness of the base material, Hilti offers three different fastening options. These solutions help maintain the corrosion resistance of the structural steel and the connection to the non-structural components.
A fastening technology where a sharp tip stainless steel fastener is driven by a powder-actuated tool into the base material, creating a high-quality connection.
Stainless steel fasteners for mildly-corrosive environments where penetration through base steel is acceptable.
Watch the sharp tip videoA revolutionary fastening technology where a blunt-tip stainless steel fastener with a smooth cylindrical or conical shank is driven by a powder-actuated or battery-powered tool into a pre-drilled hole in the base material, creating a high-quality connection.
Duplex stainless steel fasteners for highly-corrosive environments. Fiber reinforced polymer (FRP) / duplex stainless steel fasteners for mildly-corrosive environments.
Watch the blunt tip videoA revolutionary fastening technology where a blunt-tip stainless steel fastener with a screw type shank is driven by a torque controlled screw driver into the pre-drilled hole in the base material creating a tapped connection.
Duplex stainless steel fasteners for highly-corrosive environments. Duplex coated carbon steel fasteners for mildly-corrosive environments.
Watch the blunt tip screw videoUnlike welding or through bolting, Hilti fastening solutions do not require preparation of base material and re-work after the fastening is made. This makes the overall installation much faster, while providing reliable corrosion protection.
Hilti blunt tip fastening on steel can be completed by any trained operator and do not require a certified welder. Therefore, contractors can deploy welders to other critical applications where welding is an absolute must.
Unlike through bolting or clamping, Hilti fastening solutions do not require access to both sides of the steel. This further improves operator safety as there is no need to get fingers into tight spaces.
Hilti sharp tip solutions are for powder-actuated nailers, so can be used under all weather conditions. Cordless drills used for blunt tip solutions are built for tough jobsite conditions, so can be used in nearly all weathers. In addition, the cordless tools are powered by 22V Li-ion batteries so do not require a mains power supply.
Hilti provides comprehensive technical data for different thicknesses and strengths of base steel. This data is backed by International Codes Council’s Evaluation Service (ICC-ES) as well as industry approvals including, but not limited to, the American Bureau of Shipping (ABS). In addition, Hilti blunt tip screw fastening technology has been tested, and is approved for use, in aluminum base material.
Both Hilti sharp tip and blunt tip fasteners are easy to inspect after installation using a visual check or a check gauge.
With Hilti blunt tip technology, fastenings can be completed without damaging the corrosion protection coating, making it ideal for highly-corrosive environments.
As shown in the chart below, Hilti blunt tip solutions can be 57-63% more cost effective compared to traditional methods in mildly corrosive environments. Using Hilti sharp tip solutions in mildly-corrosive environments can often provide even more cost benefits in terms of total installed cost per fastening.
For a project with 100,000 fastenings of strut/channel to coated steel, the benefits over welding can be ~ $1.9 M based on the assumptions below for material and labor costs.
Disclaimer
Cost / time are estimates, can vary significantly, and use the following assumptions:
– Number of strut: 1,000
– Type of fastening: strut to steel with 2 connections per strut
– Number of fastenings: 2,000
– Labor rate for skilled welder: $ 50/hour
– Labor rate for skilled tradesman other than welder: $ 40/hour
*While welds require electrode and energy, the example assumes that the material cost is negligible for welding
**Touch up time considered for through bolting and welding
Welding | Clamping | Through bolting | Blunt tip |
Sharp tip |
|
---|---|---|---|---|---|
Material cost per fastening | $0* | $10.50 | $2.40 | $3.60 | $1.00 |
Time per fastening | 30 minutes** | 2 minutes | 4 mins 30 seconds** | 1 minute 30 seconds | 1 minute |
Base material
Steel
Minimum thickness
6 mm
Through penetration
Yes
Tool required
DX 5 or DX 450 or DX 460
Available thread diameter
M8
Fastener material
SS A2 equivalent
Base material
Steel, stainless steel, cast iron
Minimum thickness
8 mm
Through penetration
No
Tool required
SF BT A22 and DX 351-BT(G)
Available thread diameter
M6, W6, M8, M10, W10
Fastener material
SS A4 equivalent and FRP (X-BT-MF)
Base material
Steel, aluminum
Minimum thickness
6 mm
Through penetration
No
Tool required
SBT 4-A22
Available thread diameter
M8, M10, W10
Fastener material
SS A4 equivalent and duplex coated carbon steel
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