MultiFunction Boom™ General Description
MultiFunction Booms™ (patent pending number 29,610,480) are designed to provide a low maintenance, high efficiency, 50-year service life. They are watertight & corrosion free, rot-resistant & UV-stable. They are capable of withstanding temperatures to 140 degrees below freezing. They have few, if any, moving parts and they are sized with a boom diameter and wall thickness to support your site’s specific loads and budget.
MultiFunction Booms™ are modular, delivered in sections of various lengths, with different methods of inter-connection to easily fit your site-specific requirements. Additional attachments allow your booms to be configured or customized to address unique debris, security, safety, operational or structural requirements.
Manufactured using custom extruded, high-density polyethylene PE4710 material, this material conforms to ASTM D3350 with the cell classification of 445574C/E. These booms can be filled with type 1, closed-cell, expanded polystyrene foam logs, conforming to ASTM C578, and sized to fit the I.D. of the boom.
During manufacture, MultiFunction Booms are formulated with minimum of 2% carbon black and/or ultraviolet stabilizer for maximum protection against UV rays for added assurance. When installed, the material is not vulnerable to biological attack and the smooth, non-stick surface results in low friction factors with exceptional resistance to fouling. And to meet the unique requirements of many applications, these booms offer the capacity for high deformation without fracture (strain-ability) and are suitable for grounding on a regular basis.
Warranty: Insdustry leading 10 year watertight warranty on parts and materials.
Types of Boom Sections and Connections:
Flange Bolted Sections:
When boom sections can be flange bolted together, the entire boom become the structural load member, with no moving parts between boom sections. In addition to providing strength, this methodology is ideal for applications where debris exclusion or guidance is necessary; the resulting uniform boom surface, without gaps between sections, prevents debris from becoming impinged on the boom and when positioned properly, prevailing winds and current can assist in guiding floating debris toward a collection point.
Section lengths are usually 40 to 50 feet, however can be any size required. Sections are bolted together using A325 galvanized steel backer rings and galvanized hardware. The image to the right shows the debris skirt (in black) below the boom (light blue). Below right is a typical flange bolted connection and below is an installation where debris exclusion and guidance reduce the O&M cost of the facility.
To accommodate pool fluctuation, provide roll prevention between sections and shore connections, or to reduce installation expense, MultiFunction Booms are fitted with pad-eye, or universal joint connections which are sized to match the safe working load of the boom. These boom sections are generally shorter and in the case of a shore sections, the boom lengths are designed to fit a sites unique bathymetry.
The image on right shows the standard pad end, built with A572 high-strength low alloy steel plate fitted with galvanized finish pad eye and domestic safety anchor shackles. A galvanized A36 backing plate is installed behind the HDPE end flange. The entire assembly is bolted together in a sandwich fashion. With the pad eye fitting, shackles and chain can be attached to connect to shore side anchors.
The image left shows a universal joint connection which allows full movement at the joints without rotation for maximum flexibility of a boom section. When completed, boom sections with different types of fittings can be connected for site specific solutions.
Connections: To enhance safety, efficiency and reduce operations and maintenance, standard MultiFunction Booms Sections have no wear or maintenance connections located below the waterline. In addition, all connections between booms (including boat gates) are designed and rated to match boom breaking strengths, except in the case of safety connections designed to part at a predetermined load.
Debris Skirt: At some sites, MultiFunction Booms are installed with a continuous length, heavy duty, 4-ply poly-nylon debris guidance skirt. Built generally with a depth of 48 inches, the skirt is permanently attached to the boom keel to allow debris to easily move along face of boom, rather than getting entrained in porous, steel screens. This design allows debris to be guided with the assistance of wind and current to a point on shore for removal. The skirt is resistant to impacts, tearing, and abrasion. It is flexible and weighted with galvanized chain in areas where the skirt may be in contact with the pool bottom at low pool and in all other
areas, weighted with steel weight bars.
Debris Overtopping Guard (DoG):
To assist in prevention of debris from splashing over the top of the boom a debris overtopping guard runs the entire length of each boom section on the upstream side of the boom. Working like the bow of a boat, its flare prevents waves and debris from to rolling over the top of the boom and provides the boom additional freeboard. This is ideal for sites where increased debris deflection or wave attenuation is required, such as fish collection facilities.
Customization: MultiFunction Booms™ are modular and can be customized to fit a variety of strength, security or operational requirements. Fittings for walkways, structures for ice booms, methods for wave attenuation, or designs for ballasted portions of booms or turning points can be produced using our patent-pending design. A double boom might provide improved operational success on steep shorelines where grounding is expected or a more stable platform for lights and signs. Booms can allow for fitting of signs, navigation lights, security fences,
safety or other attachments as required by the owner’s site-specific needs.
Boat Gates: To prevent passage of unauthorized vessels and allow vessels operated by project staff access to restricted areas, the heavy duty PNP Boat Gate is designed so a single boatman can easily open or close the gate from either side of the boom using a safe gate latch with a long surface mounted gate
bar. Built with a rigid, heavy-duty A36 galvanized steel in a box frame construction the gate becomes an integral part of the debris boom. The gate can be locked in an open or closed position. Rubber skirting is placed between boom and boat gate (drawings available) to prevent debris from passing through gaps.
Color: MultiFunction Booms can be delivered with standard black or HDPE color (RAL 2009 orange) or (RAL 1021 yellow) to meet regulatory requirements. Custom colors are available.
Warranty: PNP provides an industry leading 10-year watertight warranty, details on request.
• Modular. Length, diameter, wall thickness and inter-connection to fit your site-specific
• Strong, heavy duty, almost bullet proof, the boom is the strength member, no wire, chains or
• Cost effective: Long installed life expected, little maintenance required. Often the lowest
• Flexible: Attachments allow the booms to be configured or customized to address unique
debris, security, safety, operational or structural requirements.
Notes on Boom Comparison:
Today, operators have a choice between booms constructed of wood, steel, aluminum, rotational molded plastic and MultiFunction Booms. The operational life of a booms is affected by the rate ofdecay of construction material, corrosion of metallic parts, ultraviolet damage, loss of watertight integrity due to puncture, rupture, stress, or the failure of boom connections between sections and the tensions, stress and loads placed on the boom when in service. Different materials and design provide different operational boom life. These are often a known quantity.Booms are often evaluated based on their initial cost and their ability to meet compliance standards.
However, when considering the long life of hydroelectric projects, understanding the dramatic difference in the levelized ownership cost which includes O&M costs can be an effective tool in boom evaluation. When revenue gains from generation can be found (due to increased efficiency, reduced
head loss) the expense of boom ownership can now be seen as an investment and measured in terms of
ROI and other financial metrics.
See a simplified boom cost analysis which can be used to provide an efficient method of initial evaluation of offerings. This analysis does not include a business as usual scenario, a detailed cash flow analysis with expenses projected over the 50-year life of a project considering the investment in relation to inflation and the weighted cost of capital, effect or salvage value, or removal and disposal cost.
However, this simplified analysis can very quickly give an evaluator an important insight on boom costs or benefits.
Downloads from our Library
MultiFunction Booms™ Product Description
Determining Return on Investment for Debris, Safety and Demarcation Barriers