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804 Natural Gas & CO > Selected Salient Points > Flashcards

Selected Salient Points Flashcards

1
Q

WHAT DOES ‘NTS’ STAND FOR?

A

NATIONAL TRANSMISSION SYSTEM

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2
Q

WHAT PRESSURE DOES THE NTS OPERATE AT?

A

85bar

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3
Q

WHAT DOES LDZ STAND FOR?

A

LOCAL DISTRIBUTION ZONE(s)

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4
Q

WHAT PRESSURE DOES THE ‘MEDIUM PRESSURE SYSTEM’ OPERATE AT?

A

25bar

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5
Q

WHAT TWO PROCESSES OCCUR AT LOCAL DISTRIBUTION SITES?

A
  1. PRESSURE STAGED DOWN TO APPROXIMATELY 1 BAR

2. STENCHING AGENT ADDED

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6
Q

WHAT MAY IDENTIFY A LOCAL DISTRIBUTION SITE?

A

GAS HOLDERS (modern sites may not have them)

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7
Q

WHAT MECHANISM IS USED TO STAGE PRESSURE DOWN?

A

A SYSTEM OF VALVES

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8
Q

HOW LONG DOES IT TAKE TO TURN OFF SUPPLY FROM THE HIGH PRESSURE NTS?

A

UP TO 1 HOUR (supply pressure must be staged down to prevent rupture from shock to system of valves being closed)

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9
Q

IS NATURAL GAS HEAVIER OR LIGHTER THAN AIR?

A

CONSIDERABLY LIGHTER

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10
Q

A JET OF GAS AT 25-85 BAR

  1. WILL CAUSE?
  2. WILL GENERATE?
A
  1. PHYSICAL MECHANICAL DAMAGE TO ITS SURROUNDINGS

2. A LOUD, JET LIKE NOISE

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11
Q

IGNITION OF NATURAL GAS BETWEEN 25-85 BAR:

  1. WILL RESULT IN?
  2. WILL CAUSE?
  3. WILL GENERATE?
A
  1. A LARGE FIRE BALL AND JET FLAME
  2. LOCALISED OXYGEN STARVATION
  3. SIGNIFICANT RADIATED HEAT
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12
Q

WHERE IT IS CONFINED OR CONGESTED, A LARGE UN-IGNITED RELEASE OF NATURAL GAS PRESENTS A RISK OF?

A

DETONATION (in exceptional circumstances these processes may lead to detonation in open air)

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13
Q

ETHYL MERCAPTAN IS ADDED TO NATURAL GAS AT WHICH STAGE OF THE SUPPLY CHAIN?

A

LOCAL DISTRIBUTION CENTRES

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14
Q

ETHYL MERCAPTAN IS CONSIDERABLY HEAVIER THAN NATURAL GAS AND WILL THEREFORE?

A

DROP WHILE THE GAS RISES

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15
Q

WHAT COLOUR IS ETHYL MERCAPTAN?

A

COLOURLESS TO YELLOW (but may be dyed by manufacturers)

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16
Q

THOUGH NATURALLY A LIQUID AT ROOM TEMPERATURE, THE VAPOUR OF ETHYL MERCAPTAN HAS AN EXPLOSIVE RANGE OF?

A

2.8-18.2%

17
Q

THE ONLY TRUE INDICATOR OF THE PRESENCE OF NATURAL GAS IS BY USE OF DIM EQUIPMENT. WHAT DOES DIM STAND FOR?

A

DETECTION, IDENTIFICATION AND MONITORING

18
Q

WHAT DOES ‘COMAH’ STAND FOR?

A

CONTROL OF MAJOR ACCIDENT HAZARDS

19
Q

PDA TO A REPORT OF A NATURAL GAS LEAK?

A

ONE PUMP

20
Q

WHAT IS THE MINIMUM DISTANCE APPLIANCES SHOULD BE POSITIONED FROM A SUSPECTED LEAK?

A

25m

21
Q

CREWS AND EQUIPMENT MUST NOT BE POSITIONED IN DIRECT LINE OF SIGHT OF A BUILDING SUSPECTED OF HAVING A GAS LEAK. CREWS MUST BE POSITIONED AT AN ANGLE GREATER THAN ??? TO THE FRONT AND REAR OF THE BUILDING

A

45 DEGREES

22
Q

MINIMUM HAZARD ZONE FOR HIGH PRESSURE GAS LEAK?

A

200m

23
Q

IF HIGH PRESSURE GAS LEAK IS CONGESTED, MINIMUM HAZARD ZONE INCREASES TO?

A

600m

24
Q

SHOULD CREWS ATTEMPT TO CONTROL A HIGH PRESSURE GAS LEAK?

A

NO

25
Q

SHOULD CREWS ATTEMPT TO EXTINGUISH THE FIRE WHEN A HIGH PRESSURE GAS LEAK IS IGNITED?

A

NO

26
Q

WHERE THERE IS AN UNCONTROLLED LEAK FROM A MASS STORAGE SITE, MINIMUM HAZARD ZONE IS?

A

1000m

27
Q

WHAT DOES HMEPO STAND FOR?

A

HAZARDOUS MATERIALS AND ENVIRONMENTAL PROTECTION OFFICER

28
Q

3 THINGS FOR ICs TO CONSIDER IN CASES OF NTS, LDZ AND LOCAL DISTRIBUTION CENTRE GAS LEAKS?

A
  1. MAJOR INCIDENT PROCEDURE?
  2. RVPs/MARSHALLING AREAS
  3. EVACUATION OR SHELTER IN PLACE?
29
Q

SAFETY CORDON FOR A LOW PRESSURE GAS LEAK IN THE DOMESTIC NETWORK?

A

25m

30
Q

RESPONSIBILITY FOR THE SAFETY OF THE GAS SUPPLY RESTS WITH THE GA. CREWS MAY BE COMMITTED TO SHUT OFF THE GAS SUPPLY ONLY WHEN:

  1. ?
  2. ?
  3. ?
A
  1. THERE IS A RISK TO LIFE IN SURROUNDING BUILDINGS OR CRITICAL INFRASTRUCTURE
  2. THEY ARE NOT PUT AT RISK OF A GAS EXPLOSION
  3. THEY ARE IN FULL PPE AND BA
31
Q

7 CONSIDERATIONS BEFORE ENTERING A BUILDING SUSPECTED OF HAVING A NATURAL GAS LEAK?

A
  1. REMOVAL OF IGNITION SOURCES eg electricity supply isolated externally
  2. SHUTTING OFF THE GAS SUPPLY FROM OUTSIDE
  3. VENTILATING PRIOR TO ENTRY
  4. FULL PPE AND BA
  5. DIM EQUIPMENT CARRIED ON FRUs, RRTs AND FITs
  6. INTRINSICALLY SAFE EQUIPMENT
  7. BARIE COMS (handhelds are not intrinsically safe)
32
Q

DOES THE FIRE SERVICE HAVE POWERS OF ENTRY AT GAS LEAK INCIDENTS FOR THE PURPOSES OF SECURING THE SUPPLY?

A

NO. THE GA DOES. CREWS SHOULD NOT MAKE ENTRY ON BEHALF OF THE GA UNLESS THERE IS AN EXCEPTIONAL PUBLIC SAFETY ISSUE.

33
Q

FOLLOWING A FIRE, WHAT MUST THE IC CONSIDER IN RESPECT OF GAS APPARATUS?

A

HIGH TEMPERATURES MAY DAMAGE SEALANTS WITHIN THE APPARATUS AND CAUSE LEAKS. IF SUSPECTED, REQUEST ATTENDANCE OF GA.

34
Q

ICs TO CONSIDER THE FOLLOWING 6 POINTS BEFORE COMMITTING A BA CREW TO VENTILATE FOLLOWING A CALL TO A DOMESTIC CO ALARM ACTUATING:

A
  1. GA MUST BE REQUESTED AS PART OF LEVEL 1 HAZMAT
  2. ALL ROOMS MUST BE VENTILATED, NOT JUST THE COMPARTMENT OF ORIGIN
  3. TURN OFF AND ISOLATE SUPPLY TO ALL GAS APPLIANCES IN THE PREMISES
  4. DUTY TO BE LEFT WITH THE GA
  5. BA MUST BE WORN (repeated small doses accumulate)
  6. ONE PUMPING APPLIANCE SUFFICIENT FOR BA TO PROTECT FROM SMALL DOSES. IF HIGHER CONCENTRATIONS PRESENT, CONSIDER ADDITIONAL RESOURCES.
35
Q

WHERE CALLS TO CO INCIDENTS INDICATE THERE IS A SUSPECTED LARGE RELEASE OR IF PERSONS ARE TRAPPED, WHAT IS THE MINIMUM ATTENDANCE REQUIRED?

A

LEVEL 2 HAZMAT (if persons are involved, rescue should be the ICs prime objective).

36
Q

DIM EQUIPMENT IS CARRIED BY

  1. ?
  2. ?
  3. ?
A
  1. FRU
  2. RRT
  3. FIT
37
Q

MAY AN IC RELY ON THE DIM EQUIPMENT OF THE GA OR OTHER AGENCIES IF CREWS ARE TO BE COMMITTED TO A RISK AREA?

A

NO

38
Q

CREWS SHOULD ONLY REMAIN AT GAS LEAK INCIDENTS TO ENSURE PUBLIC SAFETY. A REQUEST TO REMAIN IN ATTENDANCE TO PROVIDE COVER FOR THE GA WORKFORCE SHOULD BE AUTHORISED BY?

A

THE DUTY DAC (and may be a chargeable special service).

804 Natural Gas & CO (1 decks)

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