Common use of SEGMENT INFORMATION Clause in Contracts

SEGMENT INFORMATION. Operating segment information is reported in a manner consistent with the internal reports that are regularly reviewed by the chief operating decision maker in order to make decisions about the allocation of resources to the segment and assess its performance. For management purposes, the Group are organized into business units based on its products and services and have four reportable segments as follows: • Pipeline system construction segment • Engineering system installation and factory construction for energy and petrochemical business segment • Civil work construction segment • Sales and other services No operating segments have been aggregated to form the above reportable operating segments. The chief operating decision maker monitors the operating results of the business units separately for the purpose of making decisions about resource allocation and assessing performance. Segment performance is measured based on operating profit or loss and total assets and on a basis consistent with that used to measure operating profit or loss and total assets in the financial statements. The basis of accounting for any transactions between reportable segments is consistent with that for third party transactions. The following tables present revenue and profit information regarding the Group’ operating segments for the year ended December 31, 2023 and 2022, respectively. In Thousand Baht For the year ended December 31, 2023 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition - Point in time - - - 446 446 (446) - - Over time 472,511 - 1,359,407 309,349 2,141,267 - 2,141,267 Revenue from sales and services 472,511 - 1,359,407 309,795 2,141,713 (446) 2,141,267 Depreciation (26,379) - (18,703) (20,389) (65,471) 1,454 (64,017) Administrative expense (65,865) - (111,054) (49,653) (226,572) 20,208 (206,364) Segment profit (loss) (63,359) - (252,292) (110,318) (425,969) 46,903 (379,066) Other income 51,497 Interest revenue 1,115 Financial cost (68,126) Share of profit (loss) from investments in associated (119,194) Share of profit (loss) from investments in joint ventures (14,101) Profit (loss) before income tax expense (527,875) Income tax income (expense) (12,440) Profit (loss) for the year (540,315) In Thousand Baht For the year ended December 31, 2022 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition - Point in time - - - 27,038 27,038 (25,438) 1,600 - Over time 724,846 - 2,256,144 360,700 3,341,690 - 3,341,690 Revenue from sales and services 724,846 - 2,256,144 387,738 3,368,728 (25,438) 3,343,290 Depreciation (31,405) - (19,366) (18,030) (68,801) 1,454 (67,347) Administrative expense (104,365) - (92,659) (61,647) (258,671) 350 (258,321) Segment profit (loss) (54,736) - (14,468) 13,161 (56,043) 20,282 (35,761) Other income 28,519 Interest revenue 1,212 Loss from business dissolution in the subsidiary (36,846) Financial cost (42,550) Share of profit (loss) from investments in joint ventures (21,037) Profit (loss) before income tax expense (106,463) Income tax income (expense) (6,091) Profit (loss) for the year (112,554) Geographic information The Group operated in Thailand only. As a result, all the revenues and assets as reflected in these financial statements pertain exclusively to this geographical reportable segment. Major customers For the year 2023, the Group have revenue from two major customers in amount of Baht 276 million and Baht 218 million, respectively arising from pipeline system segment and other services segment (2022 : Baht 726 million and Baht 550 million, two major customers from pipeline system segments).

SEGMENT INFORMATION. Operating segment information is reported in a manner consistent with the internal reports that are regularly reviewed by the chief operating decision maker in order to make decisions about the allocation of resources to the segment and assess its performance. For management purposes, the Group are organized into business units based on its products and services and have four reportable segments as follows: • Pipeline system construction segment • Engineering system installation and factory construction for energy and petrochemical business segment • Civil work construction segment • Sales and other services No operating segments have been aggregated to form the above reportable operating segments. The chief operating decision maker monitors the operating results of the business units separately for the purpose of making decisions about resource allocation and assessing performance. Segment performance is measured based on operating profit or loss and total assets and on a basis consistent with that used to measure operating profit or loss and total assets in the financial statements. The basis of accounting for any transactions between reportable segments is consistent with that for third party transactions. The following tables present revenue and profit information regarding the Group’ operating segments for the year ended December 31, 2023 2022 and 20222021, respectively. In Thousand Baht For the year ended December 31, 2023 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition - Point in time - - - 446 446 (446) - - Over time 472,511 - 1,359,407 309,349 2,141,267 - 2,141,267 Revenue from sales and services 472,511 - 1,359,407 309,795 2,141,713 (446) 2,141,267 Depreciation (26,379) - (18,703) (20,389) (65,471) 1,454 (64,017) Administrative expense (65,865) - (111,054) (49,653) (226,572) 20,208 (206,364) Segment profit (loss) (63,359) - (252,292) (110,318) (425,969) 46,903 (379,066) Other income 51,497 Interest revenue 1,115 Financial cost (68,126) Share of profit (loss) from investments in associated (119,194) Share of profit (loss) from investments in joint ventures (14,101) Profit (loss) before income tax expense (527,875) Income tax income (expense) (12,440) Profit (loss) for the year (540,315) In Thousand Baht For the year ended December 31, 2022 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition - Point in time - - - 27,038 27,038 (25,438) 1,600 - Over time 724,846 - 2,256,144 360,700 3,341,690 - 3,341,690 Revenue Revenues from sales and services external customers 724,846 - 2,256,144 387,738 3,368,728 (25,438) 3,343,290 Revenues from subsidiary - - - - - - - Revenues from associate - - - - - - - Depreciation (31,405) - (19,366) (18,030) (68,801) 1,454 (67,347) Administrative expense (104,365) - (92,659) (61,647) (258,671) 350 (258,321) Segment profit (loss) (54,736) - (14,468) 13,161 (56,043) 20,282 (35,761) Other income 28,519 Interest revenue 1,212 Loss from business dissolution in the subsidiary (36,846) Financial cost (42,550) Share of profit (loss) from investments in joint ventures (21,037) Profit (loss) before income tax expense (106,463) Income tax income (expense) (6,091) Profit (loss) for the year (112,554) In Thousand Baht For the year ended December 31, 2021 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Revenues from external customers 1,569,575 (27,390) 2,204,953 100,915 3,848,053 (2,703) 3,845,350 Revenues from subsidiary - - - - - - - Revenues from associate - - - - - - - Depreciation (46,912) 819 (18,701) (5,203) (69,997) 1,481 (68,516) Administrative expense (122,302) 2,130 (82,251) (10,002) (212,425) (28) (212,453) Segment profit (loss) (52,626) (69,530) 41,186 2,392 (78,578) 19,559 (59,019) Other income 42,424 Interest revenue 487 Financial cost (35,060) Share of profit (loss) from investments in joint ventures 2,562 Profit (loss) before income tax expense (48,606) Income tax income (expense) (10,693) Profit (loss) for the year (59,299) Geographic information The Group operated in Thailand only. As a result, all the revenues and assets as reflected in these financial statements pertain exclusively to this geographical reportable segment. Major customers For the year 20232022, the Group have revenue from two major customers in amount of Baht 276 726 million and Baht 218 550 million, respectively arising from pipeline system segment and other services engineering system segment (2022 2021 : Baht 726 842 million and Baht 550 793 million, two major customers from pipeline system segment and civil work segments).

SEGMENT INFORMATION. Operating segment information is reported in a manner consistent with the internal reports that are regularly reviewed by the chief operating decision maker in order to make decisions about the allocation of resources to the segment and assess its performance. For management purposes, the Group Company and its subsidiaries are organized into business units based on its products and services and have four reportable segments as follows: • Pipeline system construction segment • Engineering system installation and factory construction for energy and petrochemical business segment • Civil work construction segment • Sales and other services No operating segments have been aggregated to form the above reportable operating segments. The chief operating decision maker monitors the operating results of the business units separately for the purpose of making decisions about resource allocation and assessing performance. Segment performance is measured based on operating profit or loss and total assets and on a basis consistent with that used to measure operating profit or loss and total assets in the financial statements. The basis of accounting for any transactions between reportable segments is consistent with that for third party transactions. The following tables present revenue and profit information regarding the GroupCompany’s and its subsidiaries’ operating segments for the year ended December 31, 2023 2019 and 20222018, respectively. In Thousand Baht For the year ended December 31, 2023 2019 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition Revenues from external customers 958,599 388,572 2,017,505 13,783 3,378,459 - Point in time 3,378,459 Revenues from subsidiary - - - 446 446 (446) - - Over time 472,511 - 1,359,407 309,349 2,141,267 - 2,141,267 Revenue Revenues from sales and services 472,511 associate - 1,359,407 309,795 2,141,713 (446) 2,141,267 - - - - - - Depreciation (26,379) - (18,70372,043) (20,38929,203) (65,4719,135) 1,454 (64,0174,393) (114,774) 1,423 (113,351) Administrative expense (65,865) - (111,054191,854) (49,65377,769) (226,57253,138) 20,208 (206,3641,079) (323,840) 3,551 (320,289) Segment profit (loss) (63,359) - (252,292145,031) (110,318139,238) (425,96951,411) 46,903 2,891 (379,066332,789) 13,824 (318,965) Other income 51,497 46,487 Interest revenue 1,115 Financial cost 1,664 Interest expense (68,12631,562) Bad debt and doubtful debt (433) Share of profit (loss) from investments in associated (119,194) Share of profit (loss) from investments in joint ventures (14,101) Profit (loss) 1,615 Loss before income tax expense (527,875301,194) Income tax income (expense) (12,440) Profit (loss) expense 6,107 Loss for the year (540,315295,087) In Thousand Baht For the year ended December 31, 2022 2018 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition Revenues from external customers 1,007,816 420,157 812,256 5,725 2,245,954 - Point in time 2,245,954 Revenues from subsidiary - - - 27,038 27,038 370 370 (25,438370) 1,600 - Over time 724,846 Revenues from associate - 2,256,144 360,700 3,341,690 - 3,341,690 Revenue from sales and services 724,846 16,420 - 2,256,144 387,738 3,368,728 (25,438) 3,343,290 16,420 - 16,420 Depreciation (31,405) - (19,36668,686) (18,03029,179) (68,80110,775) 1,454 (67,3473,404) (112,044) 1,491 (110,553) Administrative expense (104,365) - (92,659164,768) (61,64770,155) (258,67137,115) 350 (258,3215,448) (277,486) 3,372 (274,114) Segment profit (loss) 82,554 (54,73686,700) - (14,468411,417) 13,161 (56,0436,102) 20,282 (35,761421,665) 14,521 (407,144) Other income 28,519 41,312 Interest revenue 1,212 837 Interest expense (21,289) Bad debt and doubtful debt (365,689) Loss from business dissolution impairment on investment in the subsidiary associate (36,8461,212,731) Financial cost Share of loss from investment in associate (42,55047,389) Share of profit (loss) from investments in joint ventures (21,037) Profit (loss) 1,963 Loss before income tax expense (106,4632,010,130) Income tax income expense (expense32,299) (6,091) Profit (loss) Loss for the year (112,5542,042,429) Geographic information The Group Company and its subsidiaries operated in Thailand only. As a result, all the revenues and assets as reflected in these financial statements pertain exclusively to this geographical reportable segment. Major customers For the year 20232019, the Group Company and its subsidiaries have revenue from two major customers in amount of Baht 276 665 million and Baht 218 676 million, respectively arising from pipeline system segment and other services engineering system segment (2022 2018 : Baht 726 863 million and Baht 550 256 million, two major customers from pipeline system segment and civil work segments).

SEGMENT INFORMATION. Operating segment information is reported in a manner consistent with the internal reports that are regularly reviewed by the chief operating decision maker in order to make decisions about the allocation of resources to the segment and assess its performance. For management purposes, the Group Company and its subsidiaries are organized into business units based on its products and services and have four reportable segments as follows: • Pipeline system construction segment • Engineering system installation and factory construction for energy and petrochemical business segment • Civil work construction segment • Sales and other services No operating segments have been aggregated to form the above reportable operating segments. The chief operating decision maker monitors the operating results of the business units separately for the purpose of making decisions about resource allocation and assessing performance. Segment performance is measured based on operating profit or loss and total assets and on a basis consistent with that used to measure operating profit or loss and total assets in the financial statements. The basis of accounting for any transactions between reportable segments is consistent with that for third party transactions. The following tables present revenue and profit information regarding the GroupCompany’s and its subsidiaries’ operating segments for the year ended December 31, 2023 2020 and 20222019, respectively. In Thousand Baht For the year ended December 31, 2023 2020 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition Revenues from external customers 911,649 240,994 1,962,719 30,572 3,145,934 - Point in time 3,145,934 Revenues from subsidiary - - - 446 446 (446) - - Over time 472,511 - 1,359,407 309,349 2,141,267 - 2,141,267 Revenue Revenues from sales and services 472,511 associate - 1,359,407 309,795 2,141,713 (446) 2,141,267 - - - - - - Depreciation (26,379) - (18,70355,913) (20,38914,780) (65,47113,583) 1,454 (64,0175,308) (89,584) 1,435 (88,149) Administrative expense (65,865) - (111,054137,068) (49,65336,234) (226,57277,092) 20,208 (206,3642,923) (253,317) 4,300 (249,017) Segment profit (loss) (63,359) - (252,292206,610) (110,31820,923) (425,969295,983) 46,903 6,474 (379,066517,042) 25,426 (491,616) Other income 51,497 49,223 Interest revenue 1,115 886 Financial cost (68,126) Share of profit (loss) from investments in associated (119,19423,482) Share of profit (loss) from investments in joint ventures (14,1012,855) Profit (loss) before income tax expense (527,875467,844) Income tax income expense (expense) (12,440) 20,731 Profit (loss) for the year (540,315447,113) In Thousand Baht For the year ended December 31, 2022 2019 Pipeline system Engineering system Civil work Sales and other services Total Segments Adjustments and eliminations Consolidated Timing of revenue recognition Revenues from external customers 958,599 388,572 2,017,505 13,783 3,378,459 - Point in time 3,378,459 Revenues from subsidiary - - - 27,038 27,038 (25,438) 1,600 - Over time 724,846 - 2,256,144 360,700 3,341,690 - 3,341,690 Revenue - Revenues from sales and services 724,846 associate - 2,256,144 387,738 3,368,728 (25,438) 3,343,290 - - - - - - Depreciation (31,405) - (19,36672,043) (18,03029,203) (68,8019,135) 1,454 (67,3474,393) (114,774) 1,423 (113,351) Administrative expense (104,365) - (92,659191,854) (61,64777,769) (258,67153,138) 350 (258,3211,079) (323,840) 3,551 (320,289) Segment profit (loss) (54,736145,031) - (14,468139,238) 13,161 (56,04351,411) 20,282 2,891 (35,761332,789) 13,824 (318,965) Other income 28,519 46,487 Interest revenue 1,212 Loss from business dissolution in the subsidiary (36,846) 1,664 Financial cost (42,55031,562) Bad debt and doubtful debt (433) Share of profit (loss) from investments in joint ventures (21,037) 1,615 Profit (loss) before income tax expense (106,463301,194) Income tax income expense (expense) (6,091) 6,107 Profit (loss) for the year (112,554295,087) Geographic information The Group Company and its subsidiaries operated in Thailand only. As a result, all the revenues and assets as reflected in these financial statements pertain exclusively to this geographical reportable segment. Major customers For the year 20232020, the Group Company and its subsidiaries have revenue from two major customers in amount of Baht 276 827 million and Baht 218 1,075 million, respectively arising from pipeline system segment and other services engineering system segment (2022 2019 : Baht 726 665 million and Baht 550 676 million, two major customers from pipeline system segment and civil work segments).