U.S. Navy Ship Salvage Manual Volume 6 - Oil Spill Response

S0300-A6-MAN-060the boom configuration desired and above all, the availability of suitable anchors. Holding power,as a multiple of the anchors weight, for various anchor types can be estimated from Table E-1.Table E-1. Anchor Holding Power.Anchor type1,000-lb anchors:Danforth/LWTSTATO/NAVMOORNavy StocklessHolding power as a multiple of dry weightSoft soils(soft clays and slits)10.5242.9Hard soils(sands and stiff clays)2022-297500-lb anchorsDanforth/LWTSTATO/NAVMOORNavy Stockless100-lb anchorsDanforth/LWTSTATO/NAVMOORNavy Stockless1125312.627.73.52323-30831.625-3311E-3 SECURING BOOMS TO PIERS AND OTHER STRUCTURESIn addition to the end connections described in Paragraph 4-2.3, it is often necessary to secureboom along its length to maintain a desired configuration or provide additional restraint againstwind and current force. Near piers or other manmade structures, it may be more convenient orworkable to secure boom to the structure than to lay anchors. If the boom is fitted with mooringleg attachment points along its length, guy lines can be run from these points to cleats, bollards orsimilar fittings on the pier. If there are no mooring leg attachments on the boom, weighted guylines can be thrown over the boom as shown in Figure E-3. The boom is pulled into the desiredposition and the guy lines secured to cleats or other fittings on the pier.The end connections described in Paragraph 4-2.3 provide an oil-tight connection to a seawall orship’s hull, but may not have sufficient strength to withstand the tension resulting from wind,wave or current forces. Stress on the end connector can be alleviated by rigging guy ropes asshown in Figure E-4.E-4