run mud pump with one geneator and old scr house pricelist

ENSCO 71 is a Jack-Up drilling rig which was originally constructed at the Hitachi Zosen shipyard in 1982.  The original GE motor controls comprised five 1163 KVA generators and four 1800 ADC SCR units with associated auxiliary transformer feeders and jacking units. The SCRs were assignable to two 1600 HP twin-motor Mud Pumps, a twin motor 2000 HP Drawworks and a 1000 HP Rotary Table. A separate feeder drives a 1110 HP Top Drive. A fifth SCR was added by Hill Graham Controls in 1985 to power a third 1600 HP Mud Pump, which was cabled to the main busbars.

In early 2012, a decision was made to add a fifth 2500 KVA generator and an additional auxiliary transformer, to close-couple these to the main switchboard via a bus tie circuit breaker, and to include a dedicated feeder for the fifth SCR. A sixth SCR was also included in the switchboard extension to provide an alternative drive source for the third Mud Pump, effectively removing this load from the main switchboard. The switchboard extension, including full integration with the existing GE and Hill Graham equipment, was engineered and built by Zeefax.

As well as providing an extension to the main 600 V switchboard, Zeefax also designed, built and commissioned an accompanying 480 V switchboard comprising of an incoming circuit breaker and a number of small moulded case distribution circuit breakers.

The design and engineering process involved completing a detailed Power Studyto examine the consequences, in terms of fault rating, of adding the new equipment. Various scenarios were considered, and the financial impact was assessed to determine the most cost effective interconnection configuration. As a result of the study the amount of upgrade work required on the existing equipment was minimised.

The Power System Study was completed by gathering data about the existing switchboard arrangement and comparing this to the original, hand written, fault level calculations. The new calculations were performed using software modelling and verified to IEC 61363. The IEC 61363 Short Circuit study represents conditions that may affect typical marine or offshore installations more significantly than land-based systems, including more emphasis on generator and motor decay. This confirmed the original calculations were accurate.

As well as considering the effects of fault currents, Zeefax also completed a complete protective device co-ordination study to confirm and ensure that proper co-ordination was established for all operating scenarios. This included the existing equipment as well as the components in the switchboard extension, and the new 480 V switchboard and transformer.

Finally, the study also included calculating the strength and current-carrying capacity of the busbars under normal and fault conditions to establish the correct busbar sizes and bracing.

Zeefax has developed a program to mitigate against unscheduled stoppages and breakdowns. It is a complete and holistic approach which aims to avoid stoppages but if they do occur, ensure that the resources are on hand to minimise the damage caused. This is the Total Rig Audit (TRA) by Zeefax and is carried out by our very specialised and highly experienced Field Service Engineers.

The Zeefax Total Rig Auditavoids downtime and ensures rig systems remain operational and reliable. Many Drilling Companies will invest in a completeRig Auditin the knowledge that it offers a comprehensive overview of the state of their rig, which can also be submitted for compliance and due diligence purposes.SCR Training Simulator

Every Drilling Rig must have a Power Control Room – sometimes also known as an SCR (standing for Silicon Controlled Rectifier) System – which forms the functional heart of the power control of the drilling operations. Typically, SCR systems comprise a large steel room, inside of which will be a range of Motor Control Centres, Engine & Generator Controls, SCR Control cubicles, and other instruments and systems used for drilling purposes.

SCR Systems usually operate at 600V, and clearly, these systems can be extremely dangerous if not operated correctly and carefully by suitably trained operators. It is therefore vital that drilling engineers and operators are well trained using a combination of class room tuition and on-the-job training.

In response to this need, Zeefax have created the world’s first full size SCR Training Simulator, which accurately mimics the a real SCR; it looks and feels like the real thing, providing a realistic experience of live field operations – but without the dangerous high voltage. This system was created specifically for Naftogaz – for more details, click here.

A key feature of the simulator is the addition of the on-board computer system, which mimics all of the signals that would normally come into this SCR system from the live engines and generators, including the motors running the mud pumps, the rotary table or the Drawworks, etc. and can also simulate a wide range of known faults, allowing trainees to experience first hand problem solving in the safety of the simulator, before they experience the live system.GE Legacy Drive Systems

Used the same type SCR bridge as the Generation III, but rated at only 1200-1500 amp since the heat sink assembly is of a slightly different design. This system uses the GE generator GEM modules controls.

1980’s, 900amp. SCR bridges using the GE GEM Generator Control. As the bridges are small it requires two SCR bays to run a two-motor Mud Pump or Drawworks.

This module features digital circuitry providing enhanced control accuracy for speed and voltage, and also provides tools for system diagnostics, including “first fault” and multiple fault storage and annunciation. A fully featured internal diagnostic self-test on power up is provided, and available outputs include system KVA and kW limit protection.

The EGR is a direct replacement for the GEM Module and protects the engine through tachometer loss sensing, over speed detection, and reverse power protection with adjust-able time delay.Test and Calibration Engineer – IMP products

If you are interested in applying for this position, then please send us your latest CV and a covering letter toTest and Calibration Engineer – SCR products

Zeefax is the value source for parts and services for your legacy GE Drive and Generator Control Systems. We hold an inventory of critical spare parts and can provide comprehensive service solutions including Repair and Return of Modules and PCBs.

Zeefax operates a comprehensive repair and return service for all legacy GE Drive and Generator Control Systems. which includes cleaning, testing, repairing or replacement of defective components and a full system load test. This service includes a 6-month limited warranty.

Zeefax understands that replacement of a complete SCR Control System is often not viable due to the large cost and loss of production due to system downtime. At Zeefax we can offer a comprehensive service to support your legacy GE Drives and give it a renewed lease of life. That not only includes supply of spare parts and a repair/calibration service; qualified service engineers with years of experience with these Drives are available for regular Health Checks, fault-finding and general support purposes.Careers

Zeefax Limited has been made aware that unauthorised individuals have masqueraded as Zeefax Limited, promising job opportunities in our name and requesting payments to cover processing fees, visas, work permits or other formalities. The job offers are typically supported by forged documents, giving the appearance of an official communication, including the use of the Zeefax Limited logo and links to the Zeefax Limited website.

Zeefax Limited (nor any of the placement firms that recruit on our behalf) will NEVER require potential candidates to make any form of advance payment as part of the hiring process.

These communications are fraudulent (usually from @worker.com or @126.com) and do not originate from Zeefax Limited (@zeefax.com), nor are they associated with the Zeefax Limited recruiting process. The individuals who are sending these communications are doing so in an attempt to solicit money from potential job seekers. Be cautious of any unsolicited offers of employment particularly if you are requested to supply personal banking information or provide any form of advance payment.

If you suspect fraud, we would urge you NOT to respond to these unsolicited offers of employment, and to report such activity to your local law enforcement agency immediately!

Should you have any concerns over the validity of any correspondence received in respect of employment with Zeefax Limited, contact us directly atPLC Programming

We have expertise in many of the commonly used devices, including Siemens, Allen-Bradley, GE Fanuc and Mitsubishi, and we have the operational experience and knowledge to provide completely new applications or modify existing ones. We are also able to help and advise on strategy and implementation, as well as with start-up and commissioning.

Not only can we provide a comprehensive programming resource to help with your programming needs, we also can provide a series of PLC programming training courses. The comprehensive training experience is intended for those who wish to expand their skills and knowledge of PLC programming, fault finding and maintenance, and include modules for both novice and advanced users.

Course materials include information and techniques for a range of manufacturers including Siemens, Allen-Bradley, GE Fanucand Mitsubishi, and the curriculum may be tailored for specific requirements and needs, but will typically focus on the more practical aspects of Programmable Logic Controller applications.

All of Zeefax’s training courses are held in our design and manufacturing facility, located near London, England. To find out more about our training courses, pleaseDigital AutoSync Module

In response to many customer requests, we have designed our own version of the legacy Ross Hill Controls AutoSync AC generator control module; the new module has been completely re-designed and incorporates all new digital circuitry as well as optional expansion capability to future proof the module.

The use of modern digital circuitry and components has resulted in much improved parameter control over the previous legacy module without compromising operational reliability, and the ultra-stable frequency control system ensures safe and accurate control of generation systems.

The new front panel includes the familiar controls, but has been enhanced with the inclusion of an LCD display for module set-up and parameter display purposes; front panel controls include the manual circuit breaker and engine controls, with the addition of digital menu navigation buttons for module set-up and display options.

An important feature of the new modules is that they have exactly the same footprint and connection geometry as the old style legacy modules, making installation and upgrading of the new modules simple and quick.

Wire loom connections and attachment points are identical, meaning that no extra wiring or hardware is required in order to facilitate installation, and the new digital circuitry uses the latest available components and techniques, yielding enhanced reliability and performance over older legacy modules.

Our Research & Development department is currently working on new versions of the traditional AC and DC modules which will be available soon to add to the already released DDC and the Digital AutoSync.

These new modules will provide existing system users with a quick and cost effective upgrade path, maintaining the continuity and availability of well established installations.

Zeefax is an established global supplier of high-quality and reliable electrical and mechanical engineering services. As part of the complete service we provide to the industry, we carry out repair and maintenance of all GE752 Motors, including:

Advancements in technology mean that many of the power semiconductors which were built into SCR systems 30 or more years ago have been superseded by new devices, often with improved specifications.

Our engineers are able to ensure that, when the original component is not available, a suitable replacement can be found. If the replacement is not an exact fit, we can engineer an adaptation to ensure continued serviceability of legacy equipment.Hill Graham Controls (HGC)

Following our acquisition of Hill Graham Controls (HGC), Zeefaxis in a unique position to offer total support for all legacy Hill Graham and Ross Hill Controls (RHC) systems both in the UK and throughout the world.

Zeefax’s unique experience and expertise has allowed the company to design, manufacture, supply, repair and calibrate many of the control modules used within older Hill Graham installations, as well as other manufacturer’s systems, including Ross Hill Controls (RHC) type systems.

In recent times,Zeefax has developed and brought to market a new digital AutoSync module, with an improved contemporary design and operation. This advanced module occupies the exact same footprint and has pin-for-pin connection compatibility with the now obsolete Ross Hill module, thereby providing a simple and cost effective upgrade path for existing users of the AutoSync module.

These services mean that equipment manufactured up to 30 years ago, is still fully supported by Zeefax, and can continue to provide return on investment far beyond the normal life expectancy.Troubleshooting & Maintenance

Zeefax has the experience to assist and provide engineers to troubleshoot issues, help during downtime, and establish a program of scheduled maintenance, targeted and customised for your individual requirements.

As part of our maintenance and service offerings for SCR systems, Zeefax is able to mobilise support and engineers to provide technical assistance during emergency shutdowns and downtime periods.

It is well established that a program of planned maintenance and support can and will ease pressure on people and systems, and can result in increased reliability, uptime and ultimately profitability of the system.

By predicting issues, and by scheduling maintenance, spare parts and manpower can be correctly scheduled, minimising downtime, keeping spare part inventory under control and avoiding unwanted breakdowns.

At Zeefax, we recognise that high-quality and experienced technical resources are required during major works, such as emergency breakdown repairs or un-scheduled downtime.

Given our years of experience and unique position to offer total support for all legacy Hill Graham Controls (HGC), and other manufacturer’s systems including Ross Hill Controls (RHC), IPS, and GE Micro Drill SCR systems, Zeefax can provide a full range of technical services for installation, commissioning, and ongoing operational support.SCR System Health Checks

The time to find out if your system is reliable is when operations are quiet – not during critical well operations – so the Zeefax SCR System Health Check is designed to identify potential weaknesses and either repair or replace immediately, or mitigate against these until a repair or replacement can be effected – usually at a quite time.

Zeefax can help you to perform a comprehensive health check, and propose a detailed scope of work designed to compliment and conform to your operation schedule; this means that any potential disruption is absolutely minimised.

Zeefax understands that each rig or vessel has different circumstances and different requirements. Our engineers are able to tailor a maintenance schedule to suit any installation or operational constraints. Where special equipment is required, such as secondary injection test equipment for testing circuit breakers, Zeefax will arrange to have the equipment on site, and our technician will be competent in its use.

For reliable operation, the contact between the SCR devices and the heatsinks must be as good as possible but over time, and especially in offshore installations, corrosion may attack the interface between the SCR device plating and the aluminium heatsink. If corrosion is present it takes an expert to decide if refurbishment is required because as long as the damage is minimal and the two elements remain undisturbed, the mutual corrosion may still maintain a good contact.

As part of the health check our engineer will do a sample inspection of the heatsinks and recommend a course of action based on experience and knowledge.Repair & Calibration

Since our acquisition of Hill Graham Controls (HGC), our module repair facility and engineers, have been able to test and calibrate modules sent to us for repair within a quick turnaround period. In an important development, Zeefax has designed and built a new AC and DC Module simulator, to provide an improved testing platform for Hill Graham and Ross Hill type AC and DC modules. In particular, the AC module simulator is much improved over the older unit, and provides a greatly enhanced engine control and start-up simulation.

These improvements have been made based on our experience with testing and repairing the modules over many years, and our customers can be confident that any module returned to us for repair will receive the most comprehensive bench test possible.

In addition, we are able to repair and re-calibrate most Hill Graham and Ross Hill type printed circuit boards (PCBs), including Power Limit, Field Supply Regulator, Sprocket Slip, Drillers Console, DC Auxiliary, SCR Auxiliary and Generator Exciter PCBs. Furthermore if following evaluation, repair is not possible, in many cases we can supply new manufactured boards using the original designs, but enhanced by us using modern components and manufacturing techniques. In this way, we can help to ensure that legacy systems remain operational and continue to provide reliable and trouble free service beyond their expected life.Motors & Generators

Even given the relatively controlled working environment of typical SCR pods, the conditions can often cause deterioration to both electrical and mechanical performance, requiring removal of the unit from the system, followed by refurbishment and renovation.

During refurbishment, the pods are disassembled, checked and thoroughly cleaned; resistors and capacitors are replaced, and fuses, actuators and switches are checked and tested for operation, and replaced where necessary, and the pod is fully re-wired.

The heat sinks are inspected and if required, will be re-machined to ensure excellent electrical contact is maintained. Importantly, the SCR Thyristor ‘puck’ is replaced, and very special attention is given to the clamping torque and orientation.

When complete, a full quality inspection and electrical test is performed to ensure that the refurbished cell is in perfect working order prior to dispatch back to the owner.

The severe environment on rigs often leads to a deterioration of both electrical and mechanical performance of Foot Throttles, requiring removal of the unit followed by factory refurbishment and renovation.

Typically, units arrive in poor condition – totally seized and unusable; they are then completely disassembled, thoroughly cleaned and de-scaled, and are fitted with new bearings, bearing blocks, hardware and seals, prior to re-wiring and calibration.

Zeefax is able to provide both factory refurbishment of existing Foot Throttles and in cases where the deterioration is too severe for refurbishment, we can supply a brand new replacement to meet specific requirements.

If you would like to know more about the range of available Driller’s Foot Throttles, please call or email us, and we will be pleased to assist.SCR Blower Assemblies

An important part of every system is the forced air cooling, which is vital to ensure continuity and reliability of operation of the SCR stacks. It is essential that the heat generated during operation is reliably carried away, and Zeefax now produce a series of SCR Blower Assemblies which are compatible with the those used in legacy Hill Graham and Ross Hill type systems.

The Zeefax SCR Blowers are designed to operate with voltages up to 600 V @ 50 or 60 Hz; the operating voltage needs to be specified at the time of purchase (see the details and specification form below) and the blower may be configured with either Single or Duplex impellers and with or without base frames.

In order to aid potential users with the selection of replacement blowers, we have created a simple form which can be used to provide the few technical details we require. In this way, we can ensure that any SCR Blower supplied by us is fully compatible with existing assemblies, and will then install directly into the available location with minimal re-work required. You can download this form from this site; please fill it in and return it to us to receive a quotation.

If you would like to know more about the range of available blowers, please call or email us, and we will be pleased to assist.Printed Circuit Boards (PCBs)

Through our in-house R&D, we are developing improved specification products as replacements for legacy Hill Graham Controls or Ross Hill Controls boards; we can provide original replacements for many of the PCBs used on these systems, and by using modern techniques and components, we can even improve on some of the design features of the original products to enhance reliability and functionality.

This means that equipment manufactured up to 30 years ago is still fully supported by Zeefax, and can continue to provide a return on investment well beyond the normal life expectancy.PLC Training Course Program

During the course, we aim to provide students with an advanced training experience, enhancing the already popular series of PLC training courses provided by Zeefax.

This training course includes modules for both novice and advanced users of PLCs, and includes information and techniques for manufacturers including AB, GE Fanuc, Mitsubishi and Siemens. Courses are intended for both technicians and engineers who wish to expand their skills and knowledge of PLC programming, fault finding and maintenance.

Course programs and content may be tailored for specific requirements and needs, but will typically focus on the more practical aspects of Programmable Logic Controller applications.

At the end of the course, engineers and technicians will be familiar with the program modules and functions, and will be able to fault-find on PLC controlled plants.

The SCR Drive Assignment Contactors are fitted in the armature and are actuated by Allen Bradley PLC logic; through Allen Bradley flex I/O located in the SCR drive bay. The flex I/O communicates through a dual loop Profibus configuration to a processor for the first five SCR bays and a second matching configures for the next five SCR bays. The assignment configuration is such that any motor is assignable in three locations with any motor capable of assigning to the first five SCR bay or the second set of five SCR bays.

Each drive can support 4 different motor parameter sets. All the SCR Drives on the Frontier Driller shall be configured accordingly to the motors that they will support.

This architecture offers flexibility and reliability through redundancy in case of SCR drive failure. Should such an event occur the operator simply turns off the motor on the faulted SCR drive and turns back on allowing the PLC to assign to the next available SCR drive. Each motor is assignable to three different SCR drives with a total of twenty (20) SCR drives in the system.

The SCR Drives are controlled from consoles via profibus loop circuit to the dual redundant Logix 5561 CPU Allen Bradley PLC system. Overview of the SCR distribution with SCR PLC.

By use of the dual 5561 Allen Bradley processor (CPU) in the PLC system either processor can fail with no loss of operation. Communications to the drives is done by Profibus loop directly to the Siemens 6RA70 and flex I/0 locate each SCR bay. The flex I/O receives input and from devices outside the drive such as armature contactor feedback, drive cooling fan overload, circuit breaker status and the OFF/DRILL/MARINE selector switch. The flex I/0 receives output commands outside of the 6RA70 control for contactor assignments. The Siemens 6RA70 SCR drive sends and receives data as per the supplied manual, which controls operation of the motor and gathers operating information for logic control. All control signals from SCR to PLC shall be communicated through PROFIBUS DP field bus protocol, with the exception of the Emergency Stops, which shall be hardwired directly to the SCR Drive breaker for safety.

Signals exchanged between an SCR and its respective PLC are the same for each SCR. Apart from standard control/status signals, signals related to assignment and power management need to be exchanged.

This architecture offers flexibility and reliability through redundancy in case of PLC or communication failure. Should such an event occur, the communication cable could with stand one break in any loop and complete failure of either PLC1-A or PLC1-B with no loss of operation.

There is a PROFIBUS DP communication network for each SCR drive to the two PLC racks located in the generator cubicles. Each network is completely independent from the other with communications that are loop and able to be controlled by either CPU. The PLC racks located in the Driller’s Console and in the Mud Pump Console are networked by Ethernet Fiber optic loop to a MOXA module to convert the fiber signal. The two screens in the driller’s console are networked on this same loop with both screens able to display the same screens and status. There are two more MOXA modules connected in the same loop to supply data to the two workstations to enable data collection and trouble shooting of the complete system. There are two more MOXA modules on the same loop connected to PLC3A and PLC3B in the field supply cabinets, which in turn are connected to all the MCC, by Profibus fiber optic loop for control and status of all the required motor starters. Overview of the SCR PLC PROFIBUS DP and Ethernet communication network.

The PROFIBUS DP network in this application is based on 3 different mediums and topologies. A standard bus or line topology network with standard PROFIBUS DP RS-485 cable is established between an SCR PLC and its respective SCR drives. Each SCR is fitted with a CBP2 PROFIBUS communication board. Each one has its own address to differentiate between the various SCR Drives on the network. A redundant optical ring topology is established between all PLC racks via MOXA hub modules to form the Ethernet network. The third communication loop is Profibus fiber optic to all the Hirschmann Hub modules in the MCCs and the same type loop collecting data from the generator controls. MOXA modules and Hirschmann hub modules convert electrical signals to optical signals.

As of July 2007 we have completed the manufacturing portion of this project and have started testing the communications of the 5 remaining SCR Drive bays along with the Generator bays, Driller’s Console, Mud Pump Console & SCADA System. We have already shiped 5 DC drive bays and 1 of the 2 Isolation Switch bays and will ship the remaining equipment after completion of testing and DNV approvals.

Modern drilling techniques require additional equipment not found on older drilling rigs.  Existing power systems can be modified by Advanced Control Systems in the field to accommodate the addition of Top Drives, Generators, Mud Pumps, and Independent Rotary Tables.

Obsolete SCR / Engine-Generator Control Systems can be economically retrofitted, refurbished or replaced altogether to increase dependability and decrease downtime.

SMEC has been instrumental in giving support for new built/retrofit/replacement of SCR House/SCR System for various customers in Oil & gas sectors. Our acquired technical expertise and extended & solution specific manufacturing facilities are used in providing complete turnkey SCR packages and solutions for drilling rigs and platforms. State-of-the-art control systems developed by us are based on the established and well proven technology and designs with respect to modern hybrid / digital technology

Manasquan and St. Rose are each a win away from setting up the Shore Conference Tournament final that has been expected from the beginning. Ranney and Raritan are hoping to break up those plans Tuesday night.