Product data sheet Revision Date: 24 May 2010 12:49 Page 1 of 1
TKF LIGNOFOAM “London Formula” Specialized foam conditioner for very high speed EPB advance in dense clay soil Background
TKF LIGNOFOAM “London Formula”, an evolution of TKF EXPORT FOAM, was originally designed to meet the requirements of high speed EPB tunnelling in London, and is strongly recommended for use in any clay-rich face. (For clay-poor, sandy/gravelly/abrasive soil, switch to the sister TKF product POLYRICH FOAM. These products are compatible and do not have to be purged on changeover.) TKF LIGNOFOAM “London Formula” has been specifically refined and concentrated to ease muck flow from the cutterhead to the screw, thus allowing faster advance.
25 litre kegs; 200 litre drums; 1000 litre IBC’s; ISO/Tanker Bulk: On-site volume storage available on request.
Specific benefits Easy plasticity of the clay with minimum water addition Reduced torque, rapid advance Inhibits re-adhesion of clay cuttings within the head by neutralising clay surface chemistry Safe in use Benign environmental profile
Specifying, set-up and use Your spoil conditioning system must be correctly ranged and specified, to ensure that it can deliver the required formula and quantity of foam, and therefore the correct muck consistency, in all scenarios that you anticipate. This is essential to proper performance and smooth, rapid advance. Please contact Morrison Mud as early as possible for advice and assistance.
Consumption per m³ spoil Our general recommendations are as follows. Treatment Lower Higher intensity: Face Granular Clayey Advance rate Slower Faster SOLUTION: 1.5% to 3.0% in water ADMIX WATER solution per m³ spoil: 9% to 12% (90 to 120 litres) Actual Chemical Consumption: 1.35 kg to 3.6 kg per m³ spoil AIR requirement: (Solution addition, litres) x (Injection pressure, bar) x (1.5 to 2.5)
Example in use The relevant specifications for a 7100 mm cut diameter EPB TBM advancing at 100 mm/min in pure clay face at 3 bar face pressure would be (injection rate per minute): (Muck per min, m³) Water requirement Product consumption Air injection
39.57 4750 litres 142 litres 28,500 litres (1006 cf) of normal (atmospheric) air
Health, Safety, Environment CONSULT MSDS SHEET and assess safe use policy before use. TKF LIGNOFOAM is a low toxicity product. Biodegradable. WGK class (as delivered): 2 WGK class (as injected to face): 1
For further guidance, and specific recommendations and costings for your project, kindly contact your Supplier or: Mudtech Ltd - Morrison Mud Division, Wyburn House, 1 Crab Lane STAFFORD ST16 1SB United Kingdom Tech contact Ian Morrison 0780 117 9929 firstname.lastname@example.org www.mudtech.co.uk Tel: 44 1929 551 245 Fax: 44 1929 554 361