1. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 1 Details of Project: Coverage Area: Approximately total area round 600sq.mtr for 2 units 70 Tonne Boiler Superheater Tubing Mitsuibishi MY-N100 Duration: 13 th – 19 th September 2012 (2 units Boiler) Standard Surface Preparation: <6 microns Abrasive: 80/60 White Glass Bead Scope of Work: To blast & clean-up to SA2.5 averagely, and target to achieve ∆T from 4 0 to 10 0 using Sponge Jet Blasting System for 2 units boiler which the total area is calculated around 600sq.mtr.

2. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 2 General Arrangement of Mitsuibishi MY-N100 Boiler

3. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 3 Condition of superheated tubing before blasting & cleaning

4. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 4 Dry Ice CleaningSponge Jet Cleaning Considered as wet system and leaves watermark and need to be blow with dry air for complete cleaning. Not suitable for usage in confine space as the system could increase CO2 level in-situ (hazardous to blaster). Media need special storage facility otherwise it could easily evaporate (thus caused extra cost for storage). Slow in productivity and suitable only for small area. Dry cleaning system. Non-poisonous and Non-hazardous system for confine space. Normal storage facility for the media.  Higher productivity. Advantages of Sponge Jet Blasting compare to conventional blasting

5. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 5 Dry Ice CleaningSponge Jet Cleaning Complicated system - media need to be produce using special machine from raw CO2 and need to be use immediately after being produce (thus caused extra cost for the equipment). Inspection only comes after blasting completed - due to watermark effect and safety due to high CO2 level in confine space.  User friendly system.  Allow inspection during blasting

6. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 6 White Sponge Media TypeProfileCleaning Agent White Glass Bead Sponge Media <6 micron (<.25 mil)60/80 Mesh, Glass Bead Sponge Jet ® Media used: Table 1: White Glass Bead Sponge Media Properties Figure 1: White Glass Bead Sponge Media 60/80 Mesh

7. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 7 DescriptionSponge Jet Quantity of Media (kg)200 kg (1 st boiler) 200 kg (2 nd boiler) Recycle Factor6 Times Number of days4 Days (1 st boiler) 3 Days (2 nd boiler) * No Hiccups ManpowerSupervisor = 1 pax Blaster = 4 Pax Equipment Blasting Port / SJ Feed unit2 units Recycler2 units Compressor1 unit of 375 cfm Continuous Vacuum Recycler 1 unit Dust EmissionVery low, allow other trade e.g. welder, painter and etc to work nearby

8. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 8 Plan vs Actual Progress at Boiler A

9. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 9 Plan vs Actual Progress at Boiler B

10. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 10 Special design of extension nozzle used for blasting & cleaning

11. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 11 Special design of extension nozzle used for blasting & cleaning

12. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 12 Before After

13. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 13 Before After

14. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 14 Before After

15. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 15 Before After

16. ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER Design Temperature : 530 DegC Operating Temperature Before Cleaning : 420 DegC Operating Temperature After Cleaning : 500 DegC 16 Achievement: The Boiler ∆T achieve above target which is ∆T=50 0