Control and Disposal of Waste Water in HP and UHPWJ Operations

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Control and Disposal of Waste Water in HP and UHPWJ Operations Richard A. Burgess KTA-Tator, Inc.

Containment and Disposal of Waste Water in HP and UHPWJ Operations Overview of HPWJ & UHPWJ Surface Preparation Waste Generation Issues Unique to HPWJ & UHPWJ General Containment Design Considerations-Guide 6 Management of Wastes Generated Disposal Options

Overview of HPWJ & UHPWJ Surface Preparation Equipment Definitions and Terminology Cleanliness Standards

HPWJ Ship's Hull with Lances

Jetting Lance Rotating Barrel and 5 Jet Tips

Remotely Operated Unit-Ship

Different Design of Remotely Operated Waterjetting Unit

Hand Held Shrouded WJ Unit

Definitions and Terminology Waterjetting (WJ): Use of standard flying water released from a spout at weights of 70 MPa (10,000 psig) or more noteworthy to set up a surface for covering or examination. Water Cleaning (WC): Use of pressurized water released from a spout to expel undesirable matter from a surface.

Definitions and Terminology Low-Pressure Water Cleaning (LP WC): Water cleaning performed at weights under 34 MPa (5,000 psig). This is additionally called "control washing" or "weight washing." High-Pressure Water Cleaning (HP WC): Water cleaning performed at weights from 34 to 70 MPa (5,000 to 10,000 psig).

Definitions and Terminology High-Pressure Waterjetting (HP WJ): Waterjetting performed at weights from 70 to 210 Mpa (10,000 to 30,000 psig). Ultrahigh-Pressure Waterjetting (UHP WJ): Waterjetting performed at weights over 210 Mpa (30,000 psig).

Cleanliness Standards Joint Surface Preparation Standard SSPC-SP 12/NACE No. 5 Surface Preparation and Cleaning of Metals by Waterjetting Prior to Recoating Revised July 2002 Approved 1995

Cleanliness Standards WJ-1 Clean to Bare Substrate: A WJ-1 surface should be cleaned to a complete which, when seen without amplification , is free of all noticeable rust, earth, past coatings, process scale, and outside matter. Staining of the surface might be available.

Cleanliness Standards WJ-2 Very Thorough or Substantial Cleaning: A WJ-2 surface should be cleaned to a matte (dull, mottled) complete which, when seen without amplification , is free of all noticeable oil, oil, soil, and rust aside from arbitrarily scattered stains of rust, firmly follower thin coatings, and other firmly disciple outside matter. The recoloring or firmly disciple matter is restricted to a most extreme of 5% of the surface.

Cleanliness Standards WJ-3 Thorough Cleaning : A WJ-3 surface should be cleaned to a matte (dull, mottled) complete which, when seen without amplification , is free of all noticeable oil, oil, earth, and rust aside from haphazardly scattered stains of rust, firmly disciple thin coatings, and other firmly follower remote matter. The recoloring or firmly follower matter is restricted to a greatest of 33% of the surface.

Cleanliness Standards WJ-4 Light Cleaning : A WJ-4 surface should be cleaned to a complete which, when seen without amplification , is free of all obvious oil, oil, soil, tidy, free plant scale, free rust, and free covering. Any lingering material should be firmly disciple. (Dull Putty Knife Test)

Cleaning a Tank Interior

1.4 Visual Reference Photographs: SSPC-VIS 4/NACE VIS 7, "Guide and Reference Photographs for Steel Surfaces Prepared by Waterjetting," gives shading photos to the different evaluations of surface planning as an element of the underlying state of the steel. The most recent issue of the reference photos ought to be utilized.

Initial Condition H Deteriorated fragile multi-coat painting framework

Pressure and Flow Rate Pressure at Nozzle 70 MPa (10,000 psig) Flow 12.9 L/min (3.42 gpm) Pressure at Nozzle 140 MPa (20,000 psig) Flow 8.3 L/min (2.2 gpm) Pressure at Nozzle 280 MPa (40,000 psig) Flow 2.0 L/min (0.52 gpm)

Energy 70-MPa (10,000-psig) Jets may not fundamentally disintegrate the coatings-they are regularly utilized for fractional expulsion or for cleaning free debris

Energy 140-MPa (20,000-psig) Jets dissolve the coatings decently quickly commonly utilized for incomplete evacuation.

Energy 280-MPa (40,000-psig) Jets disintegrate and decimate coatings quick - ordinarily utilized when most or the greater part of the covering is to be evacuated

Quantity of Waste Water PSI GPM Lbs/Hr a Ft 3/Hr 10,000 3.4 1700 27.4 20,000 2.2 1102 17.6 40,000 b 2 260 4.2 an A gallon of water weighs 8.34 lbs. b-At this level of vitality surfaces dry rapidly because of warmth

Production Rates Selective stripping of external structure coatings open-cycle, hand held spear 39 ft 2/hr/weapon - 89 ft 2/hr/firearm. Breadth and spot "water-impact" within tanks with hand-held spears 157 ft 2/hr/weapon - 171 ft 2/hr/firearm

Production Rates Sweep and spot "water-impact" of external body coatings with hand-held spears – Average, 198 ft 2/hr/weapon Complete expulsion of seriously harmed external body coatings with hand-held spears Average, 152 ft 2/hr/weapon

Production Rates Automated Complete evacuation of non-slip flight deck to exposed metal shut circle machine-Average, 134 ft 2/hr/unit. Finish expulsion of external structure coatings to uncovered metal open-cycle machine-Average, 471 ft 2/hr/unit.

Waste Stream Characteristics Influenced by The state of the current covering Pressures utilized Volume of water utilized

Waste Generation Issues Unique to HPWJ & UHPWJ Mists and Gravity Quantity-Flow Rate and Volume Energy-Fluids Slurries Sludges Solids

Mists and Gravity Mists, beads of water suspended noticeable all around that can contain little particulates including colors and particles of covering Water streams because of gravity, much the same as abrasives-however water will discover and gather in the most minimal point-looks for it possess level.

Fluids Slurries Sludges Solids Fluid, fluid water where the solids content does not impact the stream or development Slurry, fluid water with suspended insoluble solids being conveyed and affecting stream Sludge, wet or wet solids that settle and oppose stream Solids, for the most part built up particles with little dampness content

General Containment Design Considerations, SSPC-Guide 6

Containment Classes Materials, Penetrability and Permeability

Containment Classes Ventilation

Table W Containment Notes Note 1: When planning a ventilation framework, mind must be taken to adjust the static weight with the info wind stream to abstain from breaking down the control or ventilation work because of high negative weight. Note 2: The table every so often distinguishes two choices for a given part. For instance, control materials (5.3.1) are appeared as being either unbending or adaptable. On the off chance that the specifier requires the utilization of inflexible materials just, this limitation must be indicated independently . Note 3: Class 4W will catch removed paint chips and garbage, yet won't contain the water utilized for cleaning. * When vacuum covered waterjetting is utilized, ground covers or free-hanging canvases may give controls proportionate to Class 1W.

Management of Wastes Generated What are the attributes of the Coating (brittle, delicate, free, thick or thin, layers) Constituents of Coating (lead, no-Lead, other metals, asbestos, and so forth ) Service Environment (urban, watershed, public utilize, modern utilize, and so forth.) Waste stream qualities (fluid, slurry, sludge, solids)

Total and Dissolved Heavy Metals Separating Lead in Wash Water by Physical Means Example-All Lead 100 grams in Wash Water 100% 80 grams in Screened Wash Water 80% 18 grams in Filtered (5µ) Wash Water 18% 0.24 grams are broken down metal 0.24% Dissolved Metals, 0.45µ channel

Full Containment and Collection Designed to keep water from tempest depletes and running off site-versatile control pools or pits Manufactured wastewater gathering frameworks pits to close-circle independent units Wet/dry vacuums, sump pumps, stomach pumps

Collection and Handling Options No accumulation required, partition of solids from the fluid by screen or geo-material. Maintenance prerequisite for solids. Gathering required, detachment of huge solids, channel to evacuate little solids. Test and open release. Accumulation required, partition of expansive solids, channel to expel little solids. Test and controlled release.

NON-LEAD BASED PAINT REMOVAL PROJECTS (Example) Water washing of the extension with the end goal of expelling chalk, soil, oil, oil, winged animal homes, and other surface flotsam and jetsam can be performed without extra regulation gave paint chips and evacuated garbage are evacuated and gathered preceding washing or are cleaned from the site subsequent to cleaning is finished every day. At the Contractor's alternative, SSPC Class 4W penetrable regulation materials portrayed above under "Water Jetting or Wet Abrasive Blast Cleaning for the Removal of Paint" can be utilized to gather the flotsam and jetsam while the washing is in progress .

LEAD BASED PAINT REMOVAL PROJECTS (Example) Water washing of the extension with the end goal of expelling chalk, soil, oil, oil, flying creature homes, and other surface flotsam and jetsam, and water streaming or wet grating impact cleaning with the end goal of evacuating paint and surface trash might be led inside a control composed, introduced, and kept up so as to catch and contain all water and waste materials. (SSPC Class 2W-3W) When water is utilized for surface cleaning, the gather