Burner Heat Radiation

7/28/2019 Burner Heat Radiation

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SCHLUMBERGER WIRELINE AND TESTING

COMPUTATION OF INCIDENT HEAT RADIATIONfor

SSB

St Joseph UBD

SJ?

Submitted By : DJS

Keeping personnel and equipment safe during burner operation is a point of concern for both ourselves

and our customers.

We would recall the following order of magni tudes:

330 BTU / hr / sqft Greatest solar radiated heat at soil level (sunbathing radiation).

440 BTU / hr / sq ft Upper limit for harmless exposure of bare human skin.

1300 BTU / hr / sqft Exposure which can heat a piece of wood up to 500 deg F and dehydrate it.

1500 BTU / hr / sq ft The API-RP-521 recommended upper limit for an oilman wearing work

clothes intermittently sheltered or sprayed with water.

UPPER LIMIT GENERALLY ADMITTED DURING TESTING IN OIL INDUSTRY.

2000 BTU / hr / sqft Reaches a pain threshold on bare human skin after 8 seconds exposure.

The skin blisters after 20 seconds.

3000 BTU / hr / sqft Upper limit for structures and equipment which are not specially

protected. Pieces of wood are heated up to 700 deg F and decompose.

A man surprised by this radiation can still escape by running away immediately.

4000 BTU / hr / sq ft Pieces of wood are heated up to 800 deg F and ignite.

5000 BTU / hr / sqft Maximum upper limit on structures.

5300 BTU / hr / sq ft Bare human skin blisters after 5 seconds.

The following method gives the heat level radiated at any point where the flame is in sight.

Incident Radiant Heat = H x G x I

Where: H = Radiant Heat released,G = Geometric Factor for specific points, and

I = Interception Factor for water screen effect.

Knowing that: 1000 BOPD radiates 93 MMBTU / hr

1 MMSCFD radiates 13 MMBTU / hr

1000 BWPD absorbs 6 MMBTU / hr

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SSB

St Joseph UBD

SJ?

Submitted By : DJS

Find H: First compute the radiant heat released H:

H = H(o) + H(g) + ( - H(w) )

Where: H(o) = Q(o) (MBOPD) x 93 = H(o) MMBTU / hr

H(g) = Q(g) (MMSCFD) x 13 = H(g) MMBTU / hr

H(w) = Q(w) (MBOPD) x 6 = H(w) MMBTU / hr

Find G: On the transparent chart, pick the point E where the heat radiated has to be computed.

Make point B on the geometrical chart coincide with the boom length used.

If the flame is deviated with respect to the boom axis, rotate the transparent chart

according to deviation. Deviation angles are represented to help you.

Read the geometrical factor G below point E.

Find I: From the target point E, the bright yellow part of the flame may be totally visible or not.

Appreciate an interception factor (I) of 0.01 (flame totally visible) to 0.00 (flame totally

hidden) to rate flame radiating ability towards the target E.

If water screens are provided, take an interception factor I as follows:

Interception Factor - I

Water Screens

0 1 2

Bright part of flame totally visible 0.0100 0.0050 0.003020" of flame hidden 0.0080 0.0040 0.0025

40" of flame hidden 0.0060 0.0030 0.0020

60" of flame hidden 0.0020 0.0010 0.0005

NOTE: The rating of water screen efficiency is purely an estimate and still

lacks experimental support.

Solving for the radiant heat released H:

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SSB

St Joseph UBD

SJ?

Submitted By : DJS

Incident Radiant Heat = H x G x I

Where: H(o) = 0 BOPD

H(g) = 65 MMSCFD

H(w) = 0 BWPD

So: H = 65

If: The 85' boom is at a 90 degree angle. The flame is at a 45 degree angle from the burner boom.

G = 650 worst case along the handrail.

If: 1 water screens are used, and 0 water screens are used, and

60 percent of flame hidden. 0 percent of flame hidden.

I = 0.001 I = 0.01 orst case

Therefore: Incident Radiant Heat = H x G x I

= 42 BTU / hr / sqft 423 BTU / hr / sqft

worst case with no water screens

RECOMMENDATION:

1 Water Screen is neccessary, hiding 60% of the flame

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COMPUTATION OF INCIDENT HEAT RADIATION

Company Name: SSB Submitted By:

Location: St Joseph UBD DJS

Well #: SJ?

EXPECTED RATES

Q(o) = 0 Q(g) = 5 Q(w) =

BOPD MMSCFD BWPD

H(o) = 0 H(g) = 65 H(w) = 0

MMBTU/hr MMBTU/hr MMBTU/hr

H = 65

GEOMETRICAL FACTOR

Angle of Burner to Rig (deg): 90 Acceptable Values

Horizontal angle measured from side of rig, 45, 60, 75 or 90

90 degrees is perpendicular to rig.

Angle of flame (deg) : 45 15, 30, 45, 60, 75 or 90

Angle measured from burner extension, Worst case is when flame is parallel to the rig, the

and using worst case along the handrail. angle of the Burner is equal to the Angle of the Flame

Length of boom (ft) : 85 65 or 85

Boom Offset (ft): 10 0, 5, 10, 15, or 20

Measured in from Handrail to Base of Boom.

Are there any protrusions from the side of the rig to be considered in the Heat Calcs? no

If Yes, Input the G Factor for a Non-Uniform Rig Layout.

If No, the Uniform Rig Layout G Factor will be used as determined from the chart.

Point of consideration: X 20 (Max value normally at 20') Y = 0 (Normally 0')

Along Handrail Towards Flame

Non-Uniform Rig Layout Uniform Rig Layout

Input G = 1286 G = 650

INTERCEPTION FACTOR

I = 0.0010 Water Screens

0 1 2

No. Screens Bright part of flame totally visible 0.0100 0.0050 0.0030

1 20% of flame hidden 0.0080 0.0040 0.0025

% Hidden 40% of flame hidden 0.0060 0.0030 0.0020

60 60% of flame hidden 0.0020 0.0010 0.0005

NOTE: The rating of water screen efficiency is purely an estimate and still lacks experimental

support. The shaded values are not realistically attainable, so DO NOT USE THEM.

Max Incident Radiant Heat along handrail with no water screens = 422.50 BTU / hr / sqft

RESULTS

The 85' boom is at a 90 degree angle. The flame is at a 45 degree angle from the burner boom.

The base of the boom is offset 10' in from the handrail.

Max Incident Radiant Heat = 42.25 BTU / hr / sqft MUST BE < 1500

Recommendation: 1 Water Screen is neccessary, hiding 60% of the flame

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CLIENT: SSB PROJECT: St Joseph UBD

AUTHOR: DJS LOCATION: St. J ?

DATE: 10-Mar-02

OIL FLOW RATE : 0 BOPD

GAS FLOW RATE : 5 MMSCFD

DISTANCE NOISE NOISE NOISE

FROM LEVEL LEVEL LEVEL

FLARE FOR OIL FOR GAS TOTAL

10 ft 116.43 dBa 116.43 dBa

20 ft 110.41 dBa 110.41 dBa

30 ft 106.88 dBa 106.88 dBa

40 ft 104.39 dBa 104.39 dBa

50 ft 102.45 dBa 102.45 dBa

60 ft 100.86 dBa 100.86 dBa

70 ft 99.52 dBa 99.52 dBa

80 ft 98.36 dBa 98.36 dBa

90 ft 97.34 dBa 97.34 dBa100 ft 96.43 dBa 96.43 dBa

110 ft 95.60 dBa 95.60 dBa

120 ft 94.84 dBa 94.84 dBa

130 ft 94.15 dBa 94.15 dBa

140 ft 93.50 dBa 93.50 dBa

150 ft 92.90 dBa 92.90 dBa

160 ft 92.34 dBa 92.34 dBa

170 ft 91.82 dBa 91.82 dBa

180 ft 91.32 dBa 91.32 dBa

190 ft 90.85 dBa 90.85 dBa

200 ft 90.41 dBa 90.41 dBa

ISO ( International Standard Organization )

permissible noise exposure for human beings :

90 dBa. for 8 hr/day




110 dBa. for 1/2 hr/day

115 dBa. for 10 mn/day

Remember that unendurable pain limit is 130 dBa.

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Burner Heat Radiation