D-13 



TM III* 



Function : Pipe trenching. Maximiom pipe diameter - 1.6m (5-2 ft) O.D. 

 concrete. Trench depth - 1.6m (5.2 ft), width - 6.5m (21 ft) 

 Operating Depth : T5m (2^6 ft). Minimum depth - 3m ( 10 ft) 

 Dimensions (LxWxH) : T.5m x 8.5m x 6.5m (2^.6 ft x 27.9 ft x 21.3 ft) 

 Weight (Dry) : 95t" (l05 tons) 

 Speed : Fine sand: 120m/hr (39^ ft) 



Sand and silts: lOOm/hr (328 ft) 

 Power: Two 1300hp diesel generators (96O KVA 230 V) , two 100 KVA 

 !4l40/300 V auxiliary generators, one 1200 CFM, 10.5 bar (152 psi) air 

 compressor. One power cable reel. 



Propulsion : Towed by surface barges. A pipe frame fits over the pipeline 

 and rests on four coated rollers which permit the machine to run over 

 the pipeline with minimal friction. Coated rollers are also located 

 beneath the pipe to stop the machine from being pulled off the pipe as 

 it is towed along by a surface barge. 



Tools/Instrumentation : The vehicle has four electrically driven pumps 

 capable of handling 12,000 gals, of water /minute. These are connected 

 into a common manifold which direct the flow to main fluidizing jets 

 on both ends of the vehicle. Two sand pumps transport the fluidized 

 material from beneath the pipeline to jet discharges which blow the spoil 

 away to the side of the trench. 



Navigation : By surface means. The pipeline serves as guidance for the 

 vehicle. 



Shipboard Components : See "Power" 



Support Ship Requirements : A specially designed pulling/jetting barge, 

 L.M. BLADER, supports the vehicle, characteristics of this barge are as 

 follows : 



Length: llOra (36l ft). Beam: 30m (98 ft). Draft: T-Tm (25-2 ft) 



DWT: 15,000 



Anchorage System: Four double drum Skaggit winches with T50m 

 (2,U60 ft) of 50mm (2 in.) wire rope (8Tt max. pull) and eight 

 T.5t anchors. 



Storm Anchor: One electrically-driven windless with chain and 5t 

 anchor. 



Accommodations: 80 berthing and full messing 



Craneage: One Crawler Crane with 25m (82 ft) boom with maximum 

 lift of 136t (150 tons). One Crawler Crane (deck travelling) 

 of 60 ton maximum lift. 



Navigational Equipment: Radar, Hi-Fix, Trisponder, Tellurometer 



Status : Operational 



Builder/Operator : Land and Marine Engineering Ltd. 



Merseyside, England 



*A smaller device, TM IV, is also operational and can trench pipe of 

 1.1m (3.6 ft) diameter in water depths of 50m (16U ft). TM IV is 

 operationally similar to TM III, construction details are not available. 



