Sunday 11 December 2011

Iran-Pakistan gas pipeline traversing history


With the current power predicament, and the relentless bursts of load shedding, there is a dire need to enhance our repertoire to meet the growing energy requirements. Both industry and indeed the masses are bearing the brunt of the dearth of electricity on a daily basis, and hence, the clamour to ameliorate matters has been growing more vociferous day by day. Amidst such state of affairs, the Iran-Pakistan gas pipeline promises to be a knight in shining armor, as far as the prospect of bolstering our gas shortage is concerned. Initially, India was very much a part of the project, but our eastern neighbours have absconded; citing security related concerns. The pipeline has been a massive undertaking, and with its initiation a long way down the memory lane, the project has come a long way. And after various brands of antagonisms, it seems to be on the brink of completion.


Origin

Pakistani civil engineer, Malik Aftab Ahmed Khan, conjured up the idea to reinforce Pakistan’s gas reserves and gave a design proposal of the potential project. In his article titled “Persian Pipeline” published in mid 1950s by the Military College of Risalpur, Aftab Ahmed highlighted the blueprint of the entire proposal and also outlined the means for its protection. The need for it to be protected arose because the drafted out pathway overlapped with many antagonistic regions, that were hell bent upon ensuring that the project was not initiated. Aftab Ahmed suggested small battalion-size cantonments should be set up along the pipeline’s proposed route through Baluchistan and Sind, which would keep the hostility in check.


Conceptualisation

While Malik Aftab Ahmed Khan’s idea was constructively intriguing, it did have its creases that needed to be ironed out. Hence after being intermittently shelved, the groundbreaking idea was conceptualised in 1989 by Rajendra K Pachauri along with Ali Shams Ardekani, former Deputy Foreign Minister of Iran. The concept of an Iran-Pakistan pipeline was further extended to include India, and this mammoth project was being touted as the ‘Iran-Pakistan-India Pipeline’ – IPI pipeline or the Peace pipeline. Dr Pachauri expounded the design to both the Iranian and the Indian governments and received a positive riposte from the Iranian hierarchy. During the annual conference of IAEE (International Association of Energy Economics) in 1990 Dr Ardekani also backed the idea.

Route

The South Pars field is the origin of this historical pipeline project and the proposed length of the pipeline is 2,775 kilometers. Starting off from Asalouyeh in Bushehr province in Iran, 1,172 kilometers of the aforementioned 2,775 kilometers of the pipeline (around 42 per cent) extends within the domain of Iran. From Asalouyeh the route is traced towards Iranshahr; the distance covered in this segment is 902 kilometers. From Iranshahr to the Iran-Pakistan border, the pipeline runs for a further 270 kilometers before it enters Pakistan. After entering Pakistan, the pipeline’s proposed path is via Baluchistan into Sindh and Punjab. From Khuzdar, there would be a tributary en route to Karachi and the main pipeline would progress till Multan. From Multan, the pipeline can be extended to Dehli. Nonetheless, if China were to show interest in the project, the route could be modified accordingly to accommodate the South-East Asian giant. Owing to concerns regarding Baluchi insurgents, an alternative pathway from Iran to the maritime boundary between India and Pakistan off Kutch has also been proposed. If this idea is to be pursued, one branch would then run into Pakistan, while another one would branch off to Kutch.

Prospects

The Iran-Pakistan pipeline project promises to bear enough fruits to drag Pakistan out of the current energy quagmire. The initial capacity of the project was touted as 22 billion cubic meters of natural gas per annum, which was going to gradually evolve towards 55 billion cubic meters per year. Nevertheless, after the project has been restricted to the stature of a bilateral matter between Pakistan and Iran, the numbers being prognosticated are 8.7 billion cubic meters of annual gas supply as the contracted numbers, and up to 40 billion cubic meters of maximum gas supply has been promised. The radius of the pipeline is 28 inches, making its diameter 56 inches and circumference approximately, 176 inches. The cost surrounding the project is said to be $7.5 billion. And while it is clear that the pipeline alone cannot act as our saviour and we would have to explore our reserves as well, it is unambiguous that it would go a long way in aiding our cause.


1990s

Deliberations over the pipeline project between Iran and Pakistan began in 1994, which was followed by the preliminary agreement in 1995. It was decided that the pipeline was going to trace its starting point in the South Pars gas field and would run all the way to Karachi. As further plans unravelled under the political hangover, Iran further proposed to extend the pipeline to India and hence in February 1999, the initial agreement was signed between Iran and India. With Iran, Pakistan and India being an enigmatic triangle of prospect, cooperation, scepticism and tension, the pipeline has been a ropy affair going to and fro and fluctuating in synchrony with the political turmoil that epitomises the region. Such a trend was at its apogee as the world moved into the new millennium.


2000s

Post 9/11, when American influence was reigning supreme in the region, the project was duly affected. United States being fiercely antagonistic towards Iran, and the Indo-Pak relationships oscillating with the tide; the aforementioned triangle then became an inscrutable quadrilateral. It was all quiet on the pipeline’s front in the first half of the previous decade, after developments began to resurface from 2007 onwards. In February 2007, Pakistan and India agreed to pay Iran $4.93 per million British thermal units ($4.67/GJ); however, some of the clauses of the agreement were still up for negotiation. In August 2008, Iran iterated its desire to see China enter the project that would make it a gargantuan South Asian project that could rewrite all history books. 2009 saw India abandon the project, owing to the proclaimed security concerns; the fact that India had signed a civilian nuclear deal with US in 2008 also triggered the decision. Even so in 2010, India reiterated its desire to be a part of the project and invited Pakistan and Iran for trilateral talks. However, like in most global matters, the most daunting influence was that of the United States of America. In January 2010, US called on Pakistan to completely abandon the project, with Iranian hostility towards the US rising and Pakistan being flaunted as a pivotal ally in America’s War on Terror. US vowed to provide assistance for a liquefied natural gas terminal and also promised to aid the import of electricity from Tajkistan through Afghanistan’s Wakhan Corridor, if Pakistan were to leave the project. Nevertheless, on 16th March 2010, Iran and Pakistan signed an agreement on the pipeline which has been followed by Iranian announcement in July 2011 that it had completed the construction of its section.

Recent menace

Target killings in Hazara are escalating and ostensibly as a warning to the Pakistani hierarchy, who plan on undertaking the construction work now that Iran has nearly completed its side of the project. Jundallah is said to be involved in attacks in Sistan-Baluchistan and Lashkar-e-Jhangvi is the principal antagonist in Baluchistan that is threatening to upset the applecart of not only the Iran-Pakistan pipeline, but the recently signed TAPI deal as well. These attempts are under the hangover of the US-Pakistan energy dialogue and Pakistan-Iran Joint Economic Commission (JEC) and are intended to ward off potential investors in the projects.

Baluchistan’s cooperation

Balochi hostility regarding the project – while indubitably veritable – has quite often been over exaggerated as well. The province is now making all the right noises as far as a positive outlook and approach towards the project are concerned. Chief Minister Baluchistan, Nawab Mohammad Aslam Raisani has been buoyant about the project and recently announced that the government of Baluchistan has agreed to give land for the project. The land to be allocated is in the districts of Gwadar and Lasbella, which is an integral route, as far as the pipeline’s passage through Baluchistan is concerned. The chief minister however, expressed his desire to see the contract of the proposed work on the pipeline through Baluchistan be given to local contractors, which would in turn bolster the economy of a province that has unfortunately lagged behind the rest as far as economic prosperity is concerned.



Negotiating price formula

Pakistan has recently articulated its desire to negotiate over the gas price formula with Iran, in accordance with the price mechanism that has been settled under TAPI (Turkmenistan Afghanistan Pakistan India) gas pipeline project with Turkmen government. According to the initial agreement between Tehran and Islamabad, Pakistan was to pay 78 per cent of crude oil parity price to Iran after a mutual consensus was reached from both sides. However, after the TAPI project has been signed, Pakistan wants to revisit the numbers with Iran. According to reports, the new numbers could save up to $100 million from the $1.25 billion that were going to cost in the construction of the Iran-Pakistan gas pipeline
.

Approaching completion

Petroleum minister Dr Asim Hussain, recently proclaimed that the pipeline project would be culminated by the end of 2013, asserting that “first gas flow is targeted by the end of 2014”. This comes after the Iranian hierarchy is on the verge of completing their side of the deal by constructing the pipeline up till the Iran-Pakistan border. Dr Asim Hussain also exclaimed that the government was pursuing a new petroleum exploration and production policy that would bolster the prospects of investment within the realms of oil and gas exploration in the country. Such incentives when coupled with the IP and TAPI projects bode well for the revolution in the energy sector in our part of the world.


Epilogue

As things stand in Pakistan, we are in dire need to an inkling of inspiration to improve our multi-pronged crises. We need to tap into our own reserves and further pursue projects along the lines of the Iran-Pakistan pipeline, and the TAPI project is another major step in the right direction. The Iran-Pakistan pipeline project has stood the test of time and has proven itself to be a steadfast quest towards the enhancement of bilateral ties and trade between two forthcoming nations and towards the amelioration of power shortages. Despite a plethora of opposition and animosity, the project continues to surge towards its desired goal. The project has weathered all storms and hopefully, we shall soon see it being proved as one of the most lucrative deals in the history of the region.

Posted by:
                     Muhammad Asif Munir
                     Mehmood-ul-Hassan

Wednesday 30 November 2011

Electrical Power Distribution and Control

Electrical power is controlled and distributed by assemblies. Each assembly-main distribution assembly, power controller assembly, load controller assembly and motor controller assembly-is an electrical equipment container or box.
Circuit breakers
A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
 Low voltage circuit breakers for control supply












Low voltage (less than 1000 VAC) types are common in domestic, commercial and industrial application, include:
MCB (Miniature Circuit Breaker)—rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.
MCCB (Molded Case Circuit Breaker)—rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.
• Low voltage power circuit breakers can be mounted in multi-tiers in LV switchboards or switchgear cabinets.




Medium-voltage circuit breakers for Generator output

 Front panel of a 1250 A air circuit breaker
manufactured by ABB. This low voltage power circuit
breaker can be withdrawn from its housing for
servicing. Trip characteristics are configurable via DIP
switches on the front panel.




Medium-voltage circuit breakers rated between 1 and 72 kV may be assembled into metal-enclosed switchgear line ups for indoor use, or may be individual components installed outdoors in a substation. Air-break circuit breakers replaced oil-filled units for indoor applications, but are now themselves being replaced by vacuum circuit breakers (up to about 35 kV). Like the high voltage circuit breakers described below, these are also operated by current sensing protective relays operated through current transformers. The characteristics of MV breakers are given by international standards such as IEC 62271. Medium-voltage circuit breakers nearly always use separate current sensors and protection relays, instead of relying on built-in thermal or magnetic overcurrent sensors.
Medium-voltage circuit breakers can be classified by the medium used to extinguish the arc:
Vacuum circuit breaker—with rated current up to 3000 A, these breakers interrupts the current by creating and extinguishing the arc in a vacuum container. These are generally applied for voltages up to about 35,000 V, which corresponds roughly to the medium-voltage range of power systems. Vacuum circuit breakers tend to have longer life expectancies between overhaul than do air circuit breakers.
Air circuit breaker—rated current up to 10,000 A. Trip characteristics are often fully adjustable including configurable trip thresholds and delays. Usually electronically controlled, though some models are microprocessor controlled via an integral electronic trip unit. Often used for main power distribution in large industrial plant, where the breakers are arranged in draw-out enclosures for ease of maintenance.
SF6 circuit breakers extinguish the arc in a chamber filled with sulfur hexafluoride gas. Medium-voltage circuit breakers may be connected into the circuit by bolted connections to bus bars or wires, especially in outdoor switchyards. Medium-voltage circuit breakers in switchgear line-ups are often built with draw-out construction, allowing the breaker to be removed without disturbing the power circuit connections, using a motor-operated or hand-cranked mechanism to separate the breaker from its enclosure.
Control Relays
                                                     AC coil control relay
Relays are used in control panels to control a circuit by a low-power signal, or where several circuits must be controlled by one signal. A type of relay that can handle the high power required to directly drive an electric motor is called a contactor.
Latching relay & Reed relays
 
Types of control relays used in a power plant.
1.     Latching Relay
2.     Reed Relay
3.     Contactor Relay
4.     Solid-State Relay
5.     Solid State Contactor Relay
6.     Mercury-watted relay
7.     Polarized relay
                                                               Solid state relay
 Protection Relays
Protection relays used to protect equipments (Alternator, Transformer, and Engine) and power supply related issues.
Types of protection relays.
1.     Over current relay
2.     Earth fault relay
3.     Reverse power relay
4.     Under voltage and over voltage relay
5.     Multifunctional relay
6.     Differential relay
7.     Over frequency and under frequency  relay
8.     Buchholz relay


 
ALARMS AND WARNINGS
Shut-down functions with display:

• Low lube oil pressure

• Low lube oil level

• High lube oil level
• High lube oil temperature
• Low jacket water pressure

• High jacket water pressure

• High jacket water temperature

• Over speed

• Emergency stop/safety loop

• Gas train failure

• Start failure

• Stop failure

• Engine start blocked

• Engine operation blocked

• Misfiring

• High mixture temperature

• Measuring signal failure

• Overload/output signal failure

• Generator overload/short circuit

• Generator over/Undervoltage

• Generator over/Underfrequency

• Generator asymmetric voltage

• Generator unbalanced load

• Generator reverse power

• High generator winding temperature

• Synchronizing failure

• Knocking failure
Specifications

 A- Open Cooling System For J/W & A/C Circuits’ Specifications

 Cooling Tower For J/W +A/C Combined Circuit
. Cooling capacity                            877500/HR        
. Flow rate                                       2925 LPM.
. Fan motor HP                               7.5 hp (approx)            
. Range                                             08°C
. Approach                                       3°C
. Wet bulb temp.                             30°C
. Water Outlet Temperature           33 °C (From the Cooling Tower)
. Water Inlet Temperature              41°C (To the Cooling Tower)
. Qty                                                  1 No. / Genset (Total 5 Nos.)


 Pumps For J/W+A/C Combined Circuit
. Type:                                               Centrifugal 100 m3 / hr.
. Flow rate:                                      2.5 bar (approx.) it may vary w.r.t. piping route 15 kW
. Head:                                             (may be revised w.r.t. supplier)
. Motor Power:                                15 kW
. Qty:                                                          7 Nos. (Two for standby)

 Ventilation Fan Specifications

nduced Draught Fan
• Flow:                                             30,000 CFM (cubic ft / minute)
• Static Pressure                                       01 inch of Water
• Motor Hp:                                    5.5
• Fan Rpm:                                     960
• Qty:                                               02 Nos. / Genset

 Exhaust Fan
• Flow:                                             20,000 CFM
• Static Pressure                                       01 inch of Water
• Motor Hp:                                    5.5
• Fan Rpm:                                     960
• Qty:                                               1 No. / Genset

 Lube Oil Tank

Lube Oil Tank have a volume of 220 Liters

 Lube Oil Pumps Specification

-Pumps For Lube Oil
• Type:                                             Gear type
• Flow rate:                                     20-30 lit. /min.
• Motor Power:                              01 eKW
• Qty:                                               1 Nos./ Power House


 Motor Control Center Specification
1- Feeder For Combined (Ht & Lt) Coolong Tower Circuit Pump

Motor Power: 15 HP (approx.)
It consist of Star Delta Starting System, having
1 - Motor Breaker
2 - Fault Contact
3 - Mains Contactor
4 - Timer
5 - Relays
6 - M-O-A. Selector Switch
7 - Auxiliary Contact for Breaker
8 - Control Fuse
9 - Indications (On-off-trip)

2- Feeder For Cooling Tower Fan Motor

Motor Power: 7.5 HP (approx)
It consist of DOL Starting Circuit having
1 - Motor Breaker
2 - Fault Contact
3 - Mains Contactor
4 - M-O-A Selector Switch
5 - Control Fuse
6 - Auxiliary Contact for Breaker
7- Indications (On – Off-Trip)

3-  Feeder For Induced Draught Fan Motor

Motor Power: 2 x (Power ratting of each motor corresponding to 15000 CFM to be checked from the supplier)
It consist of 2 x DOL Starting Circuits, each having
1 - Motor Breaker
2 - Fault Contact
3 - Mains Contactor
4 - M-O-A Selector Switch
5 - Control Fuse
6 - Auxiliary Contact for Breaker
7- Indications (On – Off-Trip)

4- Feeder for Exhaust Fan Motor

Motor Power:     7.5 Kw
It consist of DOL Starting Circuit having
1 - Motor Breaker
2 - Fault Contact
3 - Mains Contactor
4 - M-O-A Selector Switch
5 - Control Fuse
6 - Auxiliary Contact for Breaker
7- Indications (On – Off-Trip)

5- Feeder For Lube Oil Pumps’ Motor

Motor Power: 2 X 1 eKW (approx.) It
Consist of 2 x DOL Starting circuit, each having
1 - Motor Breaker
2 - Fault Contact
3 - Mains Contactor
4 - M-O-A Selector Switch
5 - Control Fuse
6 - Auxiliary Contact for Breaker
7- Indications (On – Off-Trip)

6- Circuit Breaker For Genset Control Panels

5 X 50 Amps (3 X 400 / 213V) MCB circuit breaker / engine with thermal protection.
10 x 20 Amps (231 V) MCB Circuit Breaker for Air-Conditioning & Lighting

7- Incoming circuit breaker with change over system for
mcc panel

3 X 400V, MCB with thermal protection. Its capacity is as per above various circuit breaker’s Amps.

 Optional Contacts:
1- Load Shedding Contact: (Optional)

Normally Open Contact of a breaker which customer wants to cut off for Load Shedding Purpose

2- Collective Trouble Contact: (Optional)

Normally Open Contact of a breaker which customer wants to be cut off at the time of unexpected failure of any unit. (Thus over load shut down may be prevented at that situation)




 Power Cables

• 5 x 300 mm2 / phase + 3 x 300 mm2 for neutral conductor from alternator to the bus bar. (Size of power cable may vary with respect to the site conditions)

  Warning/ Shut Down Indicators (Optional)

Horn 24 V dc
Rotation Lamp 24 V dc

The above specification for MCC is for reference purpose and this is the minimum Specification for any MCC panel.
The various motors rating may vary from suppliers to suppliers
Design MCC panel after having rating of each motors from supplier.
For all motors with capacity greater than or equal to 10 HP Star-Delta starting will be used for all motors with capacity less than 10 HP DOL starting will be used.
Customer Scope of Supply

 Self-excited self-regulated three phase generator

The generator consists of the main generator (built as rotating field machine), the exciter machine (built as rotating armature machine) and the voltage regulator with cos. phi-regulator, which is powered by a permanent magnet pilot exciter.

 Main components

• Main stator with frame
• Main stator with 2/3 pitch winding to eliminate neutral currents of 3rd order
• Terminal box includes main terminals plus auxiliary terminals for thermistors connection and control of Regulator
• Main rotor with sufficiently sized shaft dynamically balanced as per VDI 2060, Grade Q1
• Drive end bracket with bearing
• Non-drive end bracket with bearing
• Exciter unit with permanent pilot exciter
• Power factor controller
• Voltage regulator
 Electrical data and features

• Voltage adjustment: +/- 5% rated voltage (+/- 10% short-time for synchronizing)
• Static voltage accuracy: +/- 1% at no load to full load and power factor 0.8-1
• Speed variation +/- 3%, cold and hot machine
• Maximum deviation of wave form according to VDE is 5% phase to phase at open circuit
• Generator suitable for parallel operating with mains and other generators
• Sustained short circuit current at 3-pole terminal short circuit: minimum 3 times rated current for 5 Seconds.
• Overload capacity according. To IEC 34 - I/VDE 0530
• According to VDE 0530 the overspeed test ensues with 1.2 times of rated speed for 2 minutes.

Additional components:

• Electronic voltage regulator
• Electronic power factor regulator
• 3 thermistors for winding temperature monitoring
The following alternator supervisions are integrated with the multi-transducer (max. 8 functions Simultaneous):
• Overload/short-circuit [51], [50]
• Over voltage [27]
• Under voltage [59]
• Asymmetric voltage [64], [59N]
• Unbalance current [46]
• Failure Excitation [40]
• Over frequency [81>]
• Under frequency [81<]
• Lockable operation mode selector switches positions:
• "OFF"
No operation is possible, running set will shut down;