Soak Pit Design Calculation

Project

Subject

IOCL / BHEL PANIPAT

DESIGN CALCULATION

4xFr. – 6B GT COGEN PLANT

FOR

Doc. No.

Rev

4-38121-****

A

SOAK PIT

Sheet No. 1

TABLE OF CONTENTS

1.0.0PROBLEM STATEMENT.............................................................................................................2 2.0.0CONSIDERATIONS.......................................................................................................................2 3.0.0DESIGN DATA................................................................................................................................2 4.0.0DESIGN CRITERIA.......................................................................................................................2 5.0.0 CALCULATION.............................................................................................................................3 6.0.0SUMMARY......................................................................................................................................4

/var/www/apps/conversion/tmp/scratch_3/160221435.doc 23/12/03

Section

UR / EL

Project

Subject

IOCL / BHEL PANIPAT

DESIGN CALCULATION

4xFr. – 6B GT COGEN PLANT

FOR

Doc. No.

Rev

4-38121-****

A

SOAK PIT

1.0.0

1. To size 1 no. Soak pit for 4 nos. GTs of capacity 50 MVA each. 2. To size one no. Soak pit for 1 GT of capacity 50 MVA and 2 Power Transformers of capacity 31 MVA each.

2.0.0

To size one no. Soak pit for 2 Tie Transformers of capacity 37.5MVA each.

CONSIDERATIONS 3 nos. soak pits have been considered in the transformer yard. The capacity of each soak pit is calculated taking the largest transformer oil capacity.

3.0.0

DESIGN DATA Soak pit 1 (Located on the western side of s/s28 Building): Rating of Generator transformer is assumed as follows: •

Rating : 50 MVA

•

Oil capacity: 18000 litres….( As per BHEL Recommendation )

Soak pit 2 (Located on the Eastern side of s/s28 Building): Rating of Generator transformer is assumed as follows: •

Rating : 50 MVA

•

Oil capacity : 18000 litres….( As per BHEL Recommendation )

Rating of Power Transformer is assumed as follows: •

Rating : 31 MVA

•

Oil capacity: 12500 litres ….( As per BHEL Recommendation )

Soak pit 3 (to be located near the tie Tie Trafo yard suitably): Rating of Tie transformer is assumed as follows:

4.0.0

•

Rating : 37.5 MVA

•

Oil capacity : 29000 litres….( As per BHEL Recommendation )

DESIGN CRITERIA •

Soak pit volume shall be 125 % of the oil volume of the largest transformer.

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Sheet No. 2

PROBLEM STATEMENT

3.

Section

UR / EL

Project

Subject

IOCL / BHEL PANIPAT

DESIGN CALCULATION

4xFr. – 6B GT COGEN PLANT

FOR

Doc. No.

Rev

Section -

4-38121-****

A

Sheet No.

SOAK PIT

5.0.0

3

CALCULATION H1 1

Soak pit 1: Soak pit volume

= 1.25 * 18000

H2

= 22500 litres If the drain pipe (150-mm dia.) from the transformer’s individual oil pits are to be connected to the soak pit with a slope of 1 in 100. H1

= 0.15 + (1/100)*50, where 50 is the distance of soak pit from the transformer oil pit = 0.65 metre

For a volume of 22.5 cubic meter, assuming length as 4.5 m and breadth as 3.5 m H2

= 22.5/(4.5 *3.5) = 1.43 metre.

Total height of soak pit

= H 1 + H2 = 0.65 + 1.43 = 2.08 metre

Dimension of Soak pit 1 (L * B * H) is 4.5m * 3.5m * 2.08 m Soak pit 2: Soak pit volume

= 1.25 * 18000

H2

= 22500 litres If the drain pipe (150-mm dia.) from the transformer’s individual oil pits are to be connected to the soak pit with a slope of 1 in 100. H1

= 0.15 + (1/100)*50, where 50 is the distance of soak pit from the transformer oil pit

/var/www/apps/conversion/tmp/scratch_3/160221435.doc 23/12/03

UR / EL

Project

Subject

IOCL / BHEL PANIPAT

DESIGN CALCULATION

4xFr. – 6B GT COGEN PLANT

FOR

Doc. No.

Rev

4-38121-****

A

SOAK PIT

For a volume of 22.5 cubic meter, assuming length as 4.5 m and breadth as 3.5 m = 22.5/(4.5 *3.5) = 1.43 metre. Total height of soak pit

= H 1 + H2 = 0.65 + 1.43 = 2.08 metre

Dimension of Soak pit 1 (L * B * H) is 4.5m * 3.5m * 2.08 m

Soak pit 3: Soak pit volume

= 1.25 * 29000 = 36,250 litres

If the drain pipe (150-mm dia.) from the transformer’s individual oil pits are to be connected to the soak pit with a slope of 1 in 100. H1

= 0.15 + (1/100)*8, where 8 is the distance of soak pit from the transformer oil pit = 0.23 metre

For a volume of 36,250 cubic meter, assuming length as 5 m and breadth as 4.75 m H2

= 36.250/(5x4.75) = 1.53 metre.

Total height of soak pit

= H 1 + H2 = 0.23 + 1.53 = 1.76 metre

Dimension of Soak pit 2 (L * B * H) is 5m * 4.75m * 1.76m 6.0.0

SUMMARY Soak pit sizes are thus calculated.

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Sheet No. 4

= 0.65 metre

H2

Section

UR / EL