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Scope
Reference documents Safety
Method Equipment Attachment
Scope
The statement is aimed to propose the procedures to be adopted to carry out the directional boring under the road to facilitate to lay the sleeves for pipe lines 1 # each 20” Raw Ethane and 6” Propane at location identified on the attached drawing to the following reference
Drawing reference –Piping Interconnections First Street:
Safety
Prior to the commencement of any activity the labour force shall receive a / STARRT card / Toolbox talk. Any process involving a particular safety risk shall be assessed and adopted measures addressed to raise to a minimum standard
In this case the excavation has to be carried out on the Operating Authority area, therefore all the regulated precautions shall be strictly adhered to effect a full safety standard.
Excavation Work Permit-
A copy of the work permit shall be posted on a mini board installed on site at the location shown on the sketch to be noticeable to all the persons involved
A copy shall also be transmitted to EPC Contractor
Barricades, cones, markers, the night-lights, and floodlights etc. shall be installed as required at the pits for a complete safety.
Method
The necessary permit to work shall be obtained from the Plant Refinery Division.
The record drawings regarding the existing services shall be obtained
2 # trial pits shall be made manually on both ends of the proposed boring to ascertain the availability of the existing services and protect these from any damage and shall also be used for the bentonite trial at the receiving end
On site, sufficient excavated space is available to lower the sleeve in to pull into the bore On Eastern end, some electric cable is existing
2 # 24” pipe lines are also existing adjacent to the proposed route Minor trees on both ends may be effected in the roots
The excavated trench does not show any sign of water therefore, no de watering shall be carried out
Excavation shall be carried out according to the requirement
On East End missing the berm, boring machine shall be positioned in the trench at about 3 m from the berm
The boring shall be carried out in stages.
First
stage-The sleeve is in the trench on the West end and the reamer fully underground.
Second
stage-The sleeve is partly pulled in and the reamer partly withdrawn Third stage-
The sleeve further pulled and the reamer withdrawn accordingly Fourth
stage-Full portion of the sleeve is underground in the bore and the reamer out
The excavated trenches on both ends shall be backfilled by Civil Contractor according to the specification requirement and the required tests carried out
The reinstatement of the effected services shall be carried out after the directional boring is completed
Directional Boring – A non- excavation Method which does not allow collapsing of the ground surface
M / S Ditch Witch shall carry out the Directional Boring employing Jet Trac Directional Boring equipment according to their method statement attached.
Refer to the attached sketches based on the Ditch Witch guidelines
Bentonite is pure clay to be used as a fluid / slurry formed by mixing water. It shall be used to cool the drill bit and to lubricate the drill area
The material displaced by the head / sleeves shall be discharged at the receiving end in the receiving pit and removed from the site
All fully trained operators shall be used on the job
Major Equipment
Jet Track Unit (complete package), Crane, Compactor
Attachment
Plan of the area indicating trial pits etc Ditch Witch Method Statement
Cross-Section Sketches showing the indicative procedures
#67
Statements were written by Professional Eng Suraj Singh Project Manager as well as Senior Project Engineer. Most of these were approved by EPC Contractor & Company (no sketches
Top
Index
Scope
Reference documents Safety
Method Equipment Attachment
Scope
The statement is aimed to propose the procedures to be adopted to carry out the thrust boring under the road to facilitate to lay the pipe lines 1 # each 20” Raw Ethane and 6” Propane at location identified on the attached drawing to the following reference
Drawing reference –Piping Interconnections First Street
Safety
Prior to the commencement of any activity the labour force shall receive a / STARRT card / Toolbox talk. Any process involving a particular safety risk shall be assessed and adopted measures addressed to raise to a minimum standard
In this case the excavation has to be carried out on the Operating Authority area, therefore all the regulated precautions shall be strictly adhered to effect a full safety standard.
Excavation Work Permit- A copy of the work permit shall be posted on a mini board installed on site to be noticeable to all the persons involved
Barricades, cones, markers, the night-lights, and floodlights etc. shall be installed as required at the pits for a complete safety.
Traffic Signs- Necessary traffic signs at the pits shall be provided
Hand Excavation- Excavation to ascertain the routes of the existing services encountered during Thrust Boring in case not shown on the record drawings shall be carried out manually.
Method
The necessary permit to work shall be obtained from the Plant Refinery Division.
The record drawings regarding the existing services shall be obtained.
Non Excavation Method
Necessary drive and receiving pits shall be excavated by Civil Contractor according the approved procedures
M / S Ditch Witch shall carry out the Thrust Boring employing Jet Trac Directional Boring according to the brief procedures given below
The Jet Track unit shall be anchored to the ground surface using hydraulically operated anchor stakes
The directional boring / Angled bit shall be drilled into the ground using fluid assistance to operate.
Bentonite and water shall be used to form a fluid to be sprayed at low pressure ejected out of the drill head to lubricate the drill procedure as well as to cool electronic tracking components in the drill head
An electronic receiver shall be used to track the head from the ground surface and when the directional control is required, the head shall be pushed by the drill unit without rotation until the drill head angle is reached
Head shall be steered to the ground surface when it reaches the destination end
Then Drill head shall be removed from the drill pipe and a backreamer with a pipe puller attached alongwith the pipe / s to be installed underground
During backreaming, the drill fluid shall assist the backreamer lubricate and form slurried area for the installable pipe
Backreaming and pipe pulling simultaneously shall allow the pipe to be installed underground without excavation and continue until the backreamer and pipe reach the launch end of the Directional bore accomplishing boring complete
Necessary tests shall be carried out by EPC Contractor
Major Equipment
Jet Track Unit complete package
Attachment
Ditch Witch Method Statement
Sketches showing the indicative procedures
#68