Pretect Pipeline Intervention. Hot Tapping

Transcription

1 Hot Tapping

2 Pretect Pipeline Intervention. Hot Tapping

3 What is Hot Tapping Definition What is it used for? What advantages are there? Hot Tapping is a method of making a connection into an existing pipe or vessel which is still under pressure or live. Additional branches allowing supply to and from other areas of plant etc. Monitoring points for temperature probes etc. Entry points for isolation equipment (Stopples) Can be performed with out the need to shut down the plant. No need for loss of production or supply to other areas

4 Where can it be Used? Petrochemical Industry v Hydrocarbons crude & heavy oils v Light oils, diesel, kerosene, petroleum, motor oils v Various chemicals Power Generating Industry v Steam & Water Pharmaceutical & Food Industry: v Compressed air v Food products Water Industry: v Potable Water & Sewerage

5 Step 1 Mount the hot tapping machine to the tapping valve.

6 Step 2 Advance cutter/pilot assembly until it touches the parent pipe, then start the hot tap.

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17 Step 3 When pilot breaks through product fills the void, air is expelled through the tapping machine purge valve and valve is then closed to retain the pressure.

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19 Step 4 When pilot is completely through stop rotation & advance to allow u-wires to drop.

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23 Step 5 When cutter touches top of pipe restart machine to complete the cut.

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28 Step 6 When the cut is complete the machine should be stopped and cutter advanced to confirm tap complete.

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31 Step 7 Coupon and cutter are withdrawn with the coupon or cut out retained by the u-wires.

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51 Step 8 The tapping valve is then closed and the machine can be removed.

52 Typical Hot Tapping Assembly.

53 How do we retain the Coupon? Standard Option - U-wires Pilot drill has u-wires which prevent the coupon from falling into the line. This method is suitable for the vast majority of hot taps. Ø Limits are:- Ø gas velocities of up to 10 m/s (20 mph) Ø liquid velocities of up to 5 m/s (10 mph)

54 Coupon Catcher in Operation

55 Coupon Catcher in Operation

56 Coupon Catcher in Operation

57 Coupon Catcher in Operation

58 Coupon Catcher in Operation

59 Coupon Catcher in Operation

60 Coupon Catcher in Operation

61 Coupon Catcher in Operation

62 Coupon Catcher in Operation

63 Coupon Catcher in Operation

64 Coupon Catcher in Operation

65 Coupon Catcher in Operation

66 Coupon Catcher in Operation

67 Coupon Catcher in Operation

68 Coupon Catcher in Operation

69 Coupon Catcher in Operation

70 Coupon Catcher in Operation

71 Coupon Catcher in Operation

72 Coupon Catcher in Operation

73 Standard cutter with pilot drill and coupon.

74 Standard vertical tap - no unusual problems Angled vertical tap - no problems for angles less than 45 degrees As the angle of tap rotates around there becomes more chance of the swarf from the tap coming back towards the valve and the tapping machine adapter resulting in problems closing the valve and with drawing the cutter fully. The measuring rod will tend to fall out. It is also considerably harder to install the drilling machine into position.

75 Non- standard Hot Taps Tank Tops

76 Non- standard Hot Taps Lateral or Angled Taps

77 Non- standard Hot Taps Hillside Taps

78 Elbow Taps Non- standard Hot Taps

79 Limita<ons Maximum Pressure v Equipment is rated to 1440 PSI ( F (38 C) v Pressures above this can be hot tapped, specialist procedures & equipment required (Refer to Kendal Office) Maximum Temperature v Equipment is rated to 700 F ( PSI (48 Bar)

80 What informa<on is required? Line Details v Nominal size v Wall thickness v Design parameters contents, pressure & temperature v Operating conditions - if different Branch Details v Nominal size v Wall thickness v Length v Flange/interface specification v Clearance space for hot tapping machine Valve Details v Valve type - e.g. ball, gate. v Valve bore v Overall length

81 What informa<on is Required?

82 Equipment Prepara<on Machine Selection v Size of branch to be hot tapped & cutter to be used v Size of parent pipe (type of cutter) v Wall thickness of parent pipe (power required) v Material of parent pipe (cutting material & form) v Total combined length of valve & branch (travel) v Contents, pressure & temperature (seal suitability) v Clearance space for machine Machine Preparation v Valve Adapter v Cutter type v Pilot drill v Cutter Holder

83 Clearance Required for Hot Tap Machines X Y NOTE: Not just X and Y but how to get the machine into position

84 The End