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PTTACMMA PROJECTDOCUMENT NO. Page 1 of 5

PROJECT COORDIATION PROCEDURE

CALCULATION091135-PVG-EC-004PAGE: COVER

TITLE : UPS SYSTEM CALCULATION

PROJECT NAME: LPG REFRIGERATED STORAGE

CLIENT

: PETROVIETNAM GAS CORPORATION

DEC PROJECT NO.: 090366

REV. NO.DATEDESCRIPTIONPREP'NREVIEWDEC APPROVALPVGAS APPROVAL

REV. NO.PREPARATION DEPT.PREPARATIONREVIEWDEC APPROVALPVGAS APPROVAL

APVE-ELNGOC N.T

30 Oct 2010

This document is the property of Daewoo Engineering Company. Therefore, it shall not be released to any third party without permission of authorized person of Daewoo Engineering Company.

CONTENTS

31PURPOSE

32STANDARDS AND CODES

32.1.Standard and code

32.2.Calculation condition

32.3.Calculation data

32.4.Abbreviations

43CALCULATION

43.1.Calculation due to normal loads (P0)

43.2.UPS capacity selected (P)

43.3.Capacity of Battery (AH/4HR)

1 PURPOSEThis calculation is provided to determine the rating of the UPS to supply the critical loads for electrical system for the LPG REFRIGERATED STORAGE PROJECT at BA RIA VUNG TAU, VIETNAM.2 STANDARDS AND CODES2.1. Standard and code IEEE 485 - 1997, Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications IEC60896: Stationary lead-acid batteries. Other relevant standards.

2.2. Calculation condition

Input & Output of UPS shall be as follows.

AC input

: 3 ph, 4 wires, 50 Hz, 400 VAC

DC Input

: supplied from Batteries with Back-up time: 4 hour

AC output: 1 ph, 3 wires (2 + E), 50 Hz, 110 VAC

2.3. Calculation data

UPS loads, Refer tothe following documents:

Appendix 1 Instrument loads Estimation

Attachment - UPS load analysis

2.4. AbbreviationsUPS Uninterruptable Power Supply

ACAlternative Current

DCDirect Current

VACVoltage of Alternative Current

kVAKilo-Volt-Ampere

3 CALCULATION

3.1. Calculation due to normal loads (P0)

UPS capacity P P0Normal loads:

P0 = 15.09 kVA Q0 = 9.35 kVAr

(Refer to Attachment - UPS load Analysis, this value considered to the efficiency of loads.) 3.2. UPS capacity selected (P)

Current wave height is higher than normal wave height because of the harmonic currents generated by rectifier loads

Therefore:

Design contingency Capacity allowance of 10 % is considered.

UPS Capacity P = 15.09 kW x 1.1 = 16.6 kW Q = 9.35kVAr x 1.1 = 10.29kVAr

S = 19.53kVA

From the above calculation, 20 kVA of UPS would be selected

3.3. Capacity of Battery (AH/4HR)Capacity of Battery Bank required:

C = Idc x K x L

Where:

Idc: Discharge current of Battery bank in ( A )

I DC [A] = 1.2 x (S [kVA] x 1000) / UDC [V]

S: Load demand in KVA (S = 20 kVA)

UDC: Average discharge voltage of battery bank in (V)

UDC = 0.86 x Ubat = 0.86 x 110 = 95 V DC

Value 1.2 expressed 20% margin

IDC= 1.2 x (20 x 1000) / 95 = 252.6 A

K: Battery back-up time required (HR), (4 HR )

L: Aging factor, ( 1.25 ) C = 252.6 x 4 x 1.25 = 1263 AH / 4HR

Capacity of Battery bank shall be 1263 AH / 4 HRService DescriptionRated voltagePower cons.Power factor running EfLoad typeDutyAbsor. PowerLoad factorC (Continuous)

PQ

V(KW)(cos)C/I/SkWkWkVAr

High voltage switchgear (Control circuit No.1)2300.500.850.90FC0.480.950.530.33

High voltage switchgear (Control circuit No.2)2300.500.850.90FC0.480.950.530.33

Low voltage switchboard (Control circuit No.1)2301.100.850.90FC1.050.951.160.72

Low voltage switchboard (Control circuit No.2)2301.100.850.90FC1.050.951.160.72

GCB2300.100.850.90FC0.100.950.110.07

Lighting Panel for Flare2301.600.850.90FC1.520.951.691.05

230-

- DCS2301.300.850.90FC1.240.951.370.85

- F & G2301.100.850.90FC1.050.951.160.72

- Operation 2301.700.850.90FC1.620.951.791.11

- Printers (2 units)2301.600.850.90FC1.520.951.691.05

- Telecommunication system2300.200.850.90FC0.190.950.210.13

- Paging system2300.600.850.90FC0.570.950.630.39

- LAN network2300.300.850.90FC0.290.950.320.20

- CCTV system2301.100.850.90FC1.050.951.160.72

- Tank gauging Control Panel 1 (Computer).2300.300.850.90FC0.290.950.320.20

- Tank gauging Control Panel 2 (Computer).2300.300.850.90FC0.290.950.320.20

- Flow computer control panel No.12300.300.850.90FC0.290.950.320.20

- Flow computer control panel No.22300.300.850.90FC0.290.950.320.20

- Analyser2300.300.850.90FC0.290.950.320.20

TOTAL LOAD14.3015.099.35

DAEWOO ENGINERING COMPANY