Download ppt - ©2008 Sponge-Jet Inc. All rights reserved. SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER 1 Details of Project: Coverage Area: Approximately

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SPONGE JET BLASTING & CLEANING AT SUPERHEATED TUBING BOILER

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Details of Project:Coverage Area: Approximately total area round 600sq.mtr for 2 units 70 Tonne Boiler Superheater Tubing Mitsuibishi MY-N100

Duration: 13th – 19th 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 40 to 100 using Sponge Jet Blasting System for 2 units boiler which the total area is calculated around 600sq.mtr.

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General Arrangement of Mitsuibishi MY-N100 Boiler

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Condition of superheated tubing before blasting & cleaning

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Dry Ice Cleaning Sponge 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

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Dry Ice Cleaning Sponge 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

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White Sponge Media Type Profile Cleaning 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

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Description Sponge JetQuantity of Media (kg) 200 kg (1st boiler)

200 kg (2nd boiler)

Recycle Factor 6 Times Number of days 4 Days (1st boiler)

3 Days (2nd boiler)* No Hiccups

Manpower Supervisor = 1 paxBlaster = 4 Pax

Equipment Blasting Port / SJ Feed unit 2 units Recycler 2 unitsCompressor 1 unit of 375 cfmContinuous Vacuum Recycler

1 unit

Dust Emission Very low, allow other trade e.g. welder, painter and etc to work nearby

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Plan vs Actual Progress at Boiler A

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Plan vs Actual Progress at Boiler B

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Special design of extension nozzle used for blasting & cleaning

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Special design of extension nozzle used for blasting & cleaning

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Before After

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Before After

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Before After

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Before After

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•Design Temperature : 530 DegC

•Operating Temperature Before Cleaning : 420 DegC

•Operating Temperature After Cleaning : 500 DegC

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Achievement: The Boiler ∆T achieve above target which is ∆T=500