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Contributors

Filtering by Category: Vol 13

Record Drilling Research Wells in the Karoo Basin

Drill Safe

 
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Compiled by:
Lauferts, H. - Shell International E&P, The Hague, The Netherlands.
Homrighausen, R. - Akademie der Geowissenschaften, Hannover, Germany
Crous, E. - Geoserve Drilling South Africa, Johannesburg, South Africa


 The year 2015 has seen scientific drilling activities in the Karoo Basin. With funding from South Africa’s Centre of Excellence for Integrated Mineral and Energy Resource Analysis (CIMERA) and multiple international industry sponsors, the Karoo Research Initiative (KARIN) operated and delivered successfully two fully cored research wells near the towns of Ceres (drilled to 670 meters) and Willowvale (drilled to 2380 meters). The main purpose of drilling these wells was to demonstrate world class drilling safety and to provide geoscience researchers in South Africa with fresh rock samples for investigation. The secondary objective of the campaign was to prove technical capabilities of South African drilling contractors. These capabilities were known for decades in igneous and hard rock geology of the Witwatersrand. However, in the sedimentary sections of the Karoo Basin very important choices had to be made in terms of well design, drilling and completion hardware selection, mud system type, and safe and environmentally sound operational procedures.

Figure 1: A well site near Ceres, South Africa

Figure 1: A well site near Ceres, South Africa

Figure 2: Site rehabilitation post project, Ceres

Figure 2: Site rehabilitation post project, Ceres

 As with any technically complex activity, appropriate and timely planning helps to insure that set objectives can be safely achieved. This is particularly important in the sensitive Karoo Basin, where many eyes are focussing on a spotless environmental performance. The paper describes the project steps from well design, tender exercise to the actual drilling and data logging operations. 

The drilling operations at the Ceres site took place in July and August 2015, while the Willowvale well was drilled between September and December 2015. The combined core lengths of almost 3000 meters make these wells record breakers in the Karoo Basin. While successfully delivering the wells, Geoserve Drilling SA demonstrated that safe and cost effective drilling can be done by South African contractors. The drilled cores will help South African geoscientists understand the Karoo geology better and provide a sound foundation for future decision making.

Figure 3: Willowvale Project - site layout

Figure 3: Willowvale Project - site layout

Figure 4: Contained Sump System and Solids Removal Unit

Figure 4: Contained Sump System and Solids Removal Unit

Our products and some interesting mining facts!

Drill Safe

 
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Did you know that you can download our full product catalogue from our website? Feel free to reach out if you need more information. 

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The mining industry is a crucial part of the economy, not only in Canada, but in many other countries as well! “Dig in” to the industry with this infographic from @Visual Capitalist. 

Our sites continue to achieve impressive safety milestones

Drill Safe

 
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By T.C.P. Booysen

Master Drilling’s Exploration division achieved 5 years without Lost Time Injuries (LTIs) at its underground operations near Bethal, Mpumalanga and 3 LTI-free years at its surface operations near Rustenburg.

The overall LTI frequency rate for 2018 is currently at 0.00 which is a remarkable achievement.

No LTIs were recorded for 2018 on any of the Exploration division’s drill sites. Master Drilling’s safety management team would like to congratulate these sites on their excellent safety performance thus far for 2018. These safety achievements are a testament to the effective safety management systems, continuous improvement, measuring and monitoring of any non-compliance to health, safety and legal requirements and reflect a good health and safety culture within the company.

Our innovations and case studies

Drill Safe

 
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Increased safety built into modern wireline coring tool design DiscovOre & Arrow 3S

Drill Safe

 
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The design of the traditional wireline core drilling system had in large part remained unchanged since its introduction to the exploration industry. A number of safety issues associated with the traditional wireline coring system have been addressed by manufacturers over the years. Most of the focus has been on mitigating risk of injury associated with failures of the roll pin and the spearhead associated with traditional wireline coring assembly designs.

Failures of the roll pin and spearhead are not limited to worn or damaged tools but have occurred even with new tooling. They include loss or failure of the roll pin, catastrophic failure of the lifting dogs and failure of the spearhead to connect. Methods used by manufacturers to address these failures have primarily involved incorporating twist-lock overshot locks into the traditional assembly design and the use of retaining lanyards.

Both of these strategies, however, rely on the wireline coring driller’s conscious, correct and consistent use of the safety feature. Yet they allow drillers to elect when they will or will not use the safety feature. That these safety devices result in increased cycle time by adding and additional manual step presents production-focused drillers an incentive to forego their use. The safety that these features offer can also become compromised through driller error during careless moments induced by fatigue or distraction. In actual practice, then, the safety features are not utilized by the wireline coring drillers, or are not utilized correctly, 100 percent of the time.

Furthermore, these devices are themselves subject to failure. The twist-lock overshot lock’s small parts and tight clearances can lead to jamming. Retaining lanyards can fail. When these features fail, they provide no additional measure of safety against over a traditional assembly design’s risk of injury.

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These inherent limitations have focused manufacturer efforts on incorporating safety enhancements into the design of the wireline coring system itself that do not rely on a driller’s conscious, consistent and correct use.

The DiscovOre & Arrow 3S wireline core tooling concept featured in this presentation shows how one manufacturer improvements upon common failure points of the traditional overshot and head assembly concept increase safety by making it an intrinsic part of how the components connect. The design employs automatically locking lifting dogs. It eliminates the roll pin altogether, and it eliminates failures associated with the traditional spearhead design, which the lanyard system was designed to protect against in other wireline coring systems.

 
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Most importantly, the additional measure of safety it provides is automatic. It’s not subject to human error or deliberate neglect. It reduces the driller’s hands-on interaction with the tooling. Furthermore, it does not add time to the coring cycle, preserving productivity, since its built-in safety is automatically engaged during connection, not as an extra, manual step. 

 
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The biggest advantage for more efficient (time related) function is in the overshot design. Drillers report that the N system is approximately 15-20% quicker going down the hole, 20-25% quicker when using H size system and 30-35% quicker when using P size. Note that the H system uses the regular N size overshot for recovery and P size ads only cross centralizer, so the displacement area of the larger H or P drill rod will facilitate increase in descent speed.

Of course, the speed and efficiency of the wireline cable as it spools off of the winch drum will have a big effect on the drop speed. Some drillers have reported that the Discovore surface overshot would go down faster than the cable will let it when in “free spool” mode, and most comment on how quickly the overshot drops.

There are many other positives to consider when using the Discovore system:

  • The head assembly is much more rigid due to larger spindle diameters and threaded connections.

  • The latches are much larger and stronger than Excore ( and most others in the industry) which makes them more resistant to breakage and general wear. In surface configuration, the latches are free floating and do not require “lock and load” procedure. This also allows the latches to wear evenly and last longer. The natural wear is compensated for by the floating style spring loaded latch.

  • The latches are better supported by the latch housing by more than 6x the contact area. This stabilization reduces latch wear and allows for much improved driving support for the latch when rotating the drill string”. Damage to the latch housing is also dramatically reduced.

  • Water flow through the head is unrestricted due to maximized porting up to the landing indicator bushing ( the landing indicator bushing is the smallest restriction in the flow system), we use the same indicator bushing that is currently in the Excore system.

  • The overall rigid assembly functions much more smoothly in drilling mode providing balance and low vibration which improves core recovery.

  • The Discovore uses solid assembly pins which have eliminated spring pins/split pins that were typically used to assemble head assemblies (latches, latch case, spearheads etc.) This improvement not only makes the system more rigid and reliable but reduces the need for hammer and punch for removal/replacement. Hammer and punch is not only inefficient but can also cause damage to the system, reducing life and affecting function of the system.

  • There is no pivot spearhead on the Discovore head, the recovery “point” is on the overshot. This eliminates concerns over weak or damaged spearheads malfunctioning down the hole making recovery impossible, also Damaged or Weakened spearhead pivot points presented dangerous conditions during lifting and lowering which could harm operators if such failures occurred out of the hole.

The overshot design features have addressed some of the underlying issues with “traditional” overshot designs:

  • Pivoting overshot design provides flexibility during connect and disconnect of inner tube assembly while out of the hole

  • Much more robust design of the pivot point provides a stronger and more reliable connection providing better safety and simplicity of function. Redundancy safety pins are still available for this design.

  • Lifting dogs are protected to a higher degree and are less subject to wear during lifting/lowering process ( currently we have reported life/wear measured in meters drilled being 3 times longer than traditional overshot design)

Some other features such as more common components between surface and underground heads are noted as well as simplicity to convert surface to UG.

  • The underground head assembly is the same overall length as the surface system so no need for special adapter couplings.

  • The drive key design for more efficient and reliable underground function over traditional systems.

  • New drive coupling design for transfer of rotation to upper head (incorporating drive key mentioned above)

  • A loading tool for underground use makes “lock and load” process a simple task, a one handed operation. Provides safe handling and guaranteed proper installation of the tube assembly.

  • Improved propulsion seal system provides more efficient pump-in of both head and overshot assemblies.

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THE INNER TUBE PULLER: A SAFE, PROFITABLE, WELL-DESIGNED INNOVATION

Drill Safe

 
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In March 2018, VersaDrill Canada, a specialist in manufacturing multipurpose diamond drills and innovative products for the mining industry, launched its latest creation: the inner tube puller. MBI Drilling Products is now a proud authorised distributor of this product which, it’s safe to say, is a major step forward for drillers and assistant drillers.

Core extraction
Drillers’ health and safety is becoming a growing concern. Not only are more businesses working on prevention, they’re also aiming to improve their processes to avoid accidents. Core extraction is one such process in need of improvement.

Before, workers needed to force the inner tube out of a borehole. In underground operations or tight spaces, workers may have also needed to work in awkward positions. An inner tube full of rocks weighs approximately 75 lbs over 3 m, meaning that a 6 m tube can weigh 150 lbs!

Naturally, this puts constant strain on workers’ backs, making it one of the leading causes of absenteeism. What’s more, most workplace accidents are caused by excessive effort. That’s why it’s important to find a solution to make workers’ duties easier.

How it works
The patented rollers, the primary component of the inner tube puller, have been thoroughly studied to maximise grip and avoid slippage and drill rod deformation. It’s crucial that the inner tubes don’t slide back into the hole. That’s why a diamond coating was developed. Each diamond tip gently grips the inner tube to create optimal traction with minimal axial force.

The radius of the rollers was specifically designed to avoid deforming the tube. Additionally, a special diamond layer eliminates excessive friction between the tube and the rollers.

 

Watch the below video to see how the inner tube puller works.


Improve safety and productivity - online training 2019

Drill Safe

 
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Online learning programs

Different job roles on a drilling operation require very specific knowledge and skill sets. With this in mind, we have developed certificate programs, packaged as various combinations of our 17 courses, to meet the requirements of these specific roles. Our four main certificate programs are:

  1. Drilling Skills for Geologists:This program includes the technical and safety knowledge and skills required to enable the geologist to better assist in effectively managing an exploration drilling operation.

  2. Safety Officer:This program is designed so that the fundamental technical andsafetyprinciples learned can be applied to any drilling method or operation. The safety officer will be able to identify hazards more effectively and therefore be more effective in managing safety on an exploration drilling operation.

  3. Exploration Supervisor: The supervisor is undoubtedly the most important person in the chain of command in a drilling operation. This program will enable the supervisor to better manage production and the safety aspects of a drilling operation.

  4. Drill Rig Inspector:It is essential that the person conducting pre-deployment inspections is competent to do so. This program is designed to enable the drill rig inspector to conduct a comprehensive pre-deployment safety audit on a drill rig and ancillary equipment .

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We offer 17 stand alone courses. If you have a specific area of interest, register for one or more of the below courses:

  1. Drilling fundamentals

  2. Introduction to drilling methods

  3. Common drilling calculations

  4. The use of drilling fluids in exploration drilling

  5. Fundamentals of borehole surveying

  6. Economic aspects of exploration drilling

  7. Fundamentals of hazard identification

  8. Fundamentals of risk assessment

  9. Legal aspects of exploration drilling (SA Law)

  10. Drilling engineering

  11. Dual-tube reverse circulation drilling techniques

  12. Diamond core drilling techniques

  13. Pre-deployment inspection procedures

  14. Practical hazard identification

  15. Fundamentals of directional drilling

  16. Directional drilling equipment

  17. Planning a directional borehole

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Reduce strain with our logging solution

Drill Safe

 
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Without fail the geologist or driller ends up bending, kneeling, squatting on the core or core box to mark, log and arrange core in the field or at the drill site.

Geo-Explore Store offers a small fold up stool with a zippered pouch that takes some of the strain from this activity. Fold up and leave behind seat or in load bay, ideal for field crews.

We also supply sun flaps for hard hats to keep the sun off the back of the neck when logging or around the rig.

 
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Please do not hesitate to contact us for more information or quotes should you have a need.

Denis Blewett
Cell: +27 (0) 82 744 7594
Tel: +27 (0) 11 392 5324
Fax:+27 (0) 086 580 7392
Email: denis@geoexplorestore.co.za

Gloves: what capabilities matter?

Drill Safe

 
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In the last ten years the mining industry has become very diligent about requiring gloves for tasks. In most cases, staff can choose from a wide variety of glove options, all providing good to excellent cut and puncture resistance for the most common hazards. The industry has seen a commensurate reduction in minor hand injuries as a result.

But what of heavier hazards? Especially around reverse-circulation and rotary-type drills, suspended loads are heavy and often must be maneuvered in close quarters. There are "driller's gloves" that claim to be suited for these tasks and some are.

Specialty driller's gloves were produced, promising fewer injuries and better grip. They certainly looked formidable, but how much protection did they offer and at what cost to manual dexterity? In many cases we found that heavy gloves were necessary only for limited tasks and those limited tasks did not require great dexterity. This allowed us to mandate the use of heavy gloves as appropriate without engaging on the dexterity issues. Crews are encouraged to change gloves for more dexterous tasks.

Any discussion of PPE must start with a task risk assessment or observation, followed by application of the hierarchy of controls for each step. Many of the conditions we once accepted as the way things were done have disappeared as guarding, communications and system checks have been added to the process.

The hierarchy of controls must include strong procedural and administrative controls for those tasks that cannot be eliminated. Your workers must know the requirements and the reasons for those requirements. The use of mandated safety gear must be supported and enforced by every worker, with audits and support from the safety group to ensure compliance. This article will describe desirable glove qualities for remaining hazards.

So, what qualities and capabilities matter to your users?

  • Colour: high-visibility colors are the only logical choice for heavy gloves. Gloves are being used as a last line of defense in a critical task. Awareness is the basis for physical protection. Give your users a chance to build awareness around where hands and fingers are in a given task. In addition to high visibilty colors, we trained that in a two-man team, each worker watched the hands of the other. The person with hands in the danger zone was watching the operator's hands to make sure no controls were in operation. The operator watched the worker's hands to make sure they were clear before operating. High visibility colors made this awareness easier.

  • Grip: Most heavy gloves are available with a variety of grip material from heavy cotton to leather. Including your workers in your risk assessment will point to the type of grip material best for the task you are evaluating. Remember to ask about grip conditions several hours into a shift. How does a material stand up to exposure to water, oil, grease or mud? How often should gloves be changed?

  • Padding: Padding choices in heavy gloves seem weighted toward knuckle-skinning hazards. While this is a reasonable protection for mechanic gloves, where there is a crushing hazard look for wrap-around padding that can distribute the force around the fingers. One manufacturer demonstrates this by encouraging customers to put their hand inside a glove then strike it with a mallet. Do not try this with knuckle-guard-only gloves! Where a large pad on the back of the hand may distribute force across the back of the hand to reduce injury, knuckle guards are too small to effectively distribute force across a larger area.

    Again, return to your risk assessment. If the hazard is skinned knuckles, guard against that. If the hazard is a crushing injury, make sure the glove pads can distribute the force.

  • Fit: every glove is most effective when it fits best and most likely to be used when that fit is comfortable. Involve your users in determining the range of sizes to stock and don't be afraid to give those with much larger or much smaller hands their own supply of appropriately-sized gloves. A glove left on the workbench helps no one.

  • Insulation: If a worker is wearing gloves to keep his hands warm, it will be hard to ask him to don cold heavy gloves for a task in cold weather or wet gloves. Change gloves with the seasons to assure use and keep enough on hand that employees can change them out when saturated.

Gloves are not cheap and heavy gloves are amongst the more expensive gloves. They are worth the expense when you are confident they provide the protection you want your workers to have. Training employees to use them appropriately will provide better protection for workers.
Keeping a bucket of soapy water available for saturated gloves provides a place to put dirty gloves during the shift. During cleanup, the gloves and water can be agitated to clean them then the gloves can be laid out to dry for use the next day.

Like all PPE, gloves are a last line of defense. Though we invest in gloves, we should all be spending much more time evaluating tasks and applying the hierarchy of controls to ensure we don't need that last line of defense for any of our PPE.

Kolomela Projects Proudly Achieves 4 Years with no Lost Time Injuries

Drill Safe

 
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By T.C.P. Booysen and W.C. Olivier

On Sunday, 29 July 2018 Master Drilling Exploration’s (MDX) Kolomela project achieved 4 years without Lost Time Injury (LTI) or nearly 1 million LTI free man-hours. This is truly a remarkable feat considering the project employs over 100 people operating 15 drill rigs with supporting logistics at any given time.  This achievement reflects the strong safety awareness and culture of not only the MDX SHEQ department but every employee on the site. This milestone could also not have been achieved without the close collaboration of our client, Kumba Iron Ore and, more specifically, the Kolomela safety and leadership teams to whom MDX would also like to give credit.

 
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“Safety must come first, and I believe there is no reason we can’t have an injury-free workplace. Our team have really embraced this approach, understanding incidents not only impact our work, but importantly, family and home life too”, TCP Booysen, MDX senior safety officer. 

On the 15th of August 2018, the General Manager of Kolomela Mine, Mr. Masala Mutangwa and some members of his Kolomela Leadership Team (KLT), presented MDX with a certificate for this milestone safety achievement.

 
Left to right: Mr. Eddie Dixon (COO -– MDX); Mr. Trevor Booysen (Senior SHERQ – MDX); Mr. Macdonald Modise (Full-time SHE rep – Kolomela); Mr. Masala Mutangwa (GM – Kolomela); Ms. Refilwe Legotlo (Acting MTS – Manager); Mr. Jackie Lourence (Section Manager – SHE Kolomela); Mr. Jasper Coetzee (Operations Manager – MDX) and Mr. Puso Galehole (Safety Officer – MDX).

Left to right: Mr. Eddie Dixon (COO -– MDX); Mr. Trevor Booysen (Senior SHERQ – MDX); Mr. Macdonald Modise (Full-time SHE rep – Kolomela); Mr. Masala Mutangwa (GM – Kolomela); Ms. Refilwe Legotlo (Acting MTS – Manager); Mr. Jackie Lourence (Section Manager – SHE Kolomela); Mr. Jasper Coetzee (Operations Manager – MDX) and Mr. Puso Galehole (Safety Officer – MDX).

 

The COO of MDX commended the team for this remarkable achievement but emphasised that they should not become complacent and should remain vigilant and innovative in the ways they approach safety, always advocating “safety as a culture” on site.

 
Mr. Eddie Dixon, Chief Operating Officer – MDX, congratulating the Kolomela team on their excellent achievement, but warning to not be complacent, to remain vigilant and do everything possible to maintain good safety performance.

Mr. Eddie Dixon, Chief Operating Officer – MDX, congratulating the Kolomela team on their excellent achievement, but warning to not be complacent, to remain vigilant and do everything possible to maintain good safety performance.

 

The Kolomela Project has implemented several initiatives which contributed to achieving this excellent safety milestone, including but not limited to the following:

  • Ensuring that the site has the correct skills and competent persons for each job;

  • Strong safety processes which encourage pro-active safety behaviour;

  • Encouraging a culture of safety – both as a collective and as an individual;

  • Active participation in the client’s initiatives, safety strategies and safety management plans;

  • Planned Task Observation (PTO), Visible Felt Leadership (VFL), on-the-job coaching by management and leadership teams;

  • Planned audits, inspections, reporting and monitoring;

  • Learning from incidents,; through dynamic SHEQ communication across the business;

  • Embracing the “STOP & FIX” culture for unsafe conditions and/or behaviours;

  • Monthly, daily and weekly meetings and safety forums;

  • Quarterly participative forum meetings;

  • An effective safety incentive scheme.

Proud MDX employees celebrating 4 years without any LTIs with a well-deserved braai.

Proud MDX employees celebrating 4 years without any LTIs with a well-deserved braai.

MDX’s SHEQ management system and process approach proved to be fundamental contributing factors to ensuring a safe workplace at Kolomela.  Utilizing innovations such as electronic checklists, daily inspections and other paperless technologies to not only gather data on possible future areas of risk, but also communicate safety related content to employees on site rapidly and effectively, bolstering safety awareness and culture daily.
This way of doing things differently compared to traditional methods fits into Master Drilling’s vision of, “We challenge the status quo to provide our clients with specialised, adaptive one-stop drilling solutions”.  It is within the framework of this vision that MDX, in collaboration with clients, strives to accomplish even greater safety achievements with zero-harm always being the ultimate goal in the workplace.   

 

Robust, rugged, no nonsense rigs

Drill Safe

 
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DrillSafe welcomes Thor Drill Rig to the DrillSafe Community as a Contributor!

Thor drill rigs are known to be robust, rugged and no nonsense rigs. We have built over 400 drilling rigs that are operating successfully throughout South Africa, Botswana, Mozambique. Zambia, Namibia, DRC, Cameroon. Swaziland, Brazil, Europe, Australia etc.

Having built up considerable experience and success over 20 years, our drill rigs has become second to none. We are proud to supply well priced rugged, low maintenance and easy to repair products. 
We carry large quantities of spares to ensure minimum down time in case of a break down. All the spares are made in-house on CNC machines to ensure the highest quality. We also cater for the individual in the sense that we can customise a drill rig to the customer's needs and drilling conditions.

Please feel free to contact us for any information regarding the specs on drill rigs.

Sourced from https://www.thordrill.co.za/about.html

A wide variety of drilling products

Drill Safe

 
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DrillSafe welcomes Rodtek Engineering to the DrillSafe Community as a Contributor!

Rodtek Engineering has grown exponentially since its start in 2007 to becoming a market leader in Africa and the rest of the world, offering a wide variety of drilling products to our customers to ensure they have what they need to get the job done.

Because of our strategic location and size we are ideally situated to compete with international companies supplying the mining industry in Africa and worldwide. We manufacture premium equipment at competitive prices with very short lead times to maximize your company’s profitability.

For us it’s about customer service, offering premium drilling equipment with expert knowledge and design capabilities to keep you drilling for longer with minimal down time and maximum production.

We offer more than good quality and service, we offer a partnership. We supply some of the biggest drilling companies in the word as they have come to rely on the quality, consistency, and availability of our products to keep them competitive on any drilling site.

Together with our sister company Thor Drill Rig we provide a turn-key operation providing Drilling machines and equipment of the highest quality to customers globally.

Sourced from http://rodtekengineering.co.za.

Our safety mantra

Drill Safe

 
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DrillSafe welcomes Hall Core Drilling to the DrillSafe Community as a Contributor!

"The safety of our employees and those impacted by our operations are non-negotiable. The company's mantra, HARM FREE encompasses safety, health and the environment in which Hall Core operates and takes priority in every aspect of the business. We believe there is no monetary or other gain that can ever justify or remediate the loss of life or limb. It is for this very reason that Hall Core Drilling embraces only one universal and overriding principal, HARM FREE.

HARM FREE not only extends to our employees but to those with whom we interact in our day-to-day activities, including the communities and environment in which we work.

The company follows a risk-based approach in which every potential risk is listed, rated and mitigations implemented. The mitigation of risks is an all encompassing approach that includes our employees, equipment and behaviour on site. Our Fatal Risk Control Protocol is designed and implemented to address the underlying issues that heighten the risk of fatalities in our day-to-day conduct and forms the foundation of our HARM FREE approach."

Sourced from http://www.hallcoredrilling.co.za

How to Safely Assemble an RC Hammer

Drill Safe

 
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By Luke Byrne

The history of pneumatic hammers is thought to date back to 1844 when they were originally designed for hard rock drilling in quarry environments. The hammer remained at the surface of the hole whereby more drill pipe was added once the head reached the table. At this time the systems used were inefficient and resulted in inaccuracies of the borehole which in turn resulted in inaccurate control of the blasting process. Once the DTH system was engineered by Andre Stenuik from Belgium in 1954 it was quickly implemented and then soared to the top as the premier method for hard rock drilling diameters of 5” and above.

While significant product developments have been made over the years to the DTH hammer category the hazards involved within assembly and disassembly of the product largely remain the same. Mincon Rockdrill’s take its responsibility seriously in all HSE matters and strictly adheres to the following controls measures when assembling our DTH hammers in our manufacturing environment. All employees prescribe to the safe work practices, manual handling techniques, correct use of tooling, lifting aids, housekeeping and personal protective equipment appropriate for the task as highlighted from the relevant risk assessment.

Safe Assembly of a Reverse Circulation Hammer

Ensure all components, except for the sample tube, are liberally coated with good quality rock drill oil and threads with thread grease. Check the condition of all O rings and the check valve seal before assembly. Assembly of all hammers should be completed with the following PPE steel cap boots, gloves and safety glasses. Tooling such as dolly’s and hammers should be inspected and dressed as appropriate before use.

  • Identify the chuck end of the hammer and stand the wear sleeve with the chuck end facing up (ensure the wear sleeve is on even ground and the area is free of spill hazards). Insert the piston retaining ring in to the groove provided. Ensure the extraction groove on the retaining ring is facing the chuck end of the hammer.

  • Insert the Aligner (with the smaller outside diameter facing the piston retaining ring) in to the wear sleeve. Using a soft steel drift, tap the aligner in to place against the piston retaining ring.

  • Place the bit retaining rings on top of the aligner.

  • Grease the chuck then screw (with the chuck sleeve assembled on it) in to the wear sleeve.

  • Seal up the chuck end of the hammer as to reduce the likelihood of rock oil running from the bottom end producing slip hazards.

  • Lay the hammer horizontally then lubricate the piston and feed into the wear sleeve (as the piston is heavy and lubricated be careful for the pinch point between the two parts)

  • Stand the hammer with the back head end facing up (Be sure the environment is clean so the hammer will not slip thereby generating a crush point)

Note: This is one type of injury that can be sustained.

Note: This is one type of injury that can be sustained.

 
  • Insert the Sample tube mount in to the inner cylinder and fit the seating rings around the round holes on the inner cylinder.

  • Insert the Inner cylinder assembly in to the wear sleeve. Tap the assembly in to place using a soft steel drift (inspect the drift before use as metal fragments can lodge in the skin at velocity).

  • Place the lock ring on top of the sample tube mount.

  • Fit the spacer on to the sample tube with the flat face facing down to the drill bit end of the sample tube. Place the check valve spring on to the locating recess on the spacer and fit the check valve in to place.

  • Spray the area under the rings of the sample tube with penetrating oil (e.g. CRC / WD40). If hammer oil is used then the sample tube will not go in to place properly because a hydraulic lock will occur between the sample tube shoulder and the sample tube mount.

  • Insert the sample tube assembly in to the hammer.

  • Pour hammer oil in to the hammer.

  • Fit the screen to the adaptor tube and insert the assembly in to the back head. Insert the circlip in to the back head to lock the assembly in to place.

  • Screw the back head assembly in to the wear sleeve. There should be a standoff gap of between 0.5mm - 1mm (0.020” – 0.040”) between the back head and wear sleeve shoulders. If the shoulders meet up then the lock ring needs to be replaced so that all internal parts are properly locked in place.
    Seal up the top of the hammer.

  • Store the hammer on its side and rotate it periodically if it is being stored for an extended period of time. If a hammer is to be stored for a long period of time, we would recommend that the hammer be disassembled, oiled up, and stored in a clean, dry environment.

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Complete your projects on time with high-quality drill rods and casings

Drill Safe

 
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Premier Drilling Equipment is a well-established core & diamond drilling product supplier to the mining and exploration industry in Africa. We pride ourselves on the fact that we only source the best quality drilling products from the world’s leading suppliers.

This helps our happy customers minimise the amount of downtime on their projects as a result of faulty or low-quality drilling equipment.

Our range of Core Drilling Products include:

– Drill Rods & Casing
– Core Barrels
– Diamond Drilling
– Grease & Polymers
– Instruments
– Versadrill Diamond Drilling Products