PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our Free Top Contractors e-Resource Guide.

Problem Solving Forum

| More

October 15 - October 21, 2012

What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?



More items for Surface Preparation


Selected Answers

From Chuck Pease of MMI Tank on October 16, 2012:
     Friction between the blast media and the structure being blasted is the cause. The risk is, as the accumulation of suspended blast fines accumulates in the atmosphere, the potential for explosion increases. Control is typically achieved by having both the blast hose and equipment grounded, as well as the structure being blasted. A good dust collection system to help control the accumulation of blast fines helps also. Use of the required blast/spark-proof lighting is also essential.

From Dan Ruark of IDS Blast on October 16, 2012:
     Static electricity while blasting stems from the part being blasted not being grounded. (Don't use rubber mats in blast cabinets and try to keep part always in contact with the blast cabinet floor.)

From Richard McLaughlin of Marco Group International on October 18, 2012:
     What causes static electricity during blast is an effect known as “triboelectric generation” or “tribocharging." You can see a small scale demonstration of the effect when you balloon on a sweater and hold it near your hair. Common static electricity is a form of triboelectric charge. It occurs when certain materials come in contract through extended friction and each picks up an electric charge. The polarity and strength vary greatly due to factors such as duration of contact, speed of contact, material making contact, surface roughness, humidity, and the list goes on, so the potential charge is not very predictable. Ironically, the use of smooth-bore, semi-conductive hose, high velocity fluidizing with dry air, and metallic or metallic base fine granular particles flowing in that air stream, which are all desired conditions for abrasive blasting with compressed air, create a near perfect condition to create large potential charges. The only solution is as Dan mentioned, making sure your system is entirely bonded and grounded. This includes the use of blast hose with a significant amount of carbon black to make it semi-conductive, metal hose couplings,  a good connection to your blast pot and a grounding object. If you use nylon hose couplings, you will have to employ a set of jumper wires to complete the ground circuit.

Please sign in to submit your answer this question    

Tagged categories: Abrasive blasting; Static control


Current PSF Question | Submit a PSF Question | Full PSF Archive

NLB Corporation
NLB Sure Shroud: Greater Protection and Flexibility

NLB’s Sure Shroud’s lighter weight and flexibility reduces operator fatigue and offers unmatched protection against high pressure hose ruptures. 10k to 40k psi rated.


Advanced Recycling Systems
ADVANCED RECYCLING SYSTEMS (ARS)

Recycling Machines, Dust Collectors, Rapid Deployment units are time-tested and approved for the rugged industrial environment. Contact ARS today!
(330)536-8210


Monti Tools, Inc.
BRISTLE BLASTER® - THE ORIGINAL ONE

Surface cleanliness of SSPC-10 | Anchor profile
up to 4.7 mils | Removes corrosion & coatings |
ATEX approved for zone 1
| www.monti.com | 832-623-7970


Axxiom Manufacturing
Revolutionary Units

By integrating Schmidt's Aftercoolers with our blast pots, these systems remove moisture from air and minimize equipment footprint on jobsite.
Call 1-800-231-2085


Graco Inc.
Saves up to 80% of energy costs

• Smooth, low pulsation
  spraying
• No air motor = no more icing
  issues
• First of its kind approved for
  hazardous locations
e-Xtreme™ Electric Airless Sprayer Learn more


Atlantic Design, Inc.
CLICK HERE

to see what we did to this dust collector! ADI can increase the efficiency and life of your equipment! Any brand, for less than new! 866.Call.ADI


Abrasives Inc.
Check our Prices for Blast Abrasives

Faced with higher abrasive costs? We invite you to call & check our rates on Black Magic® coal slag and other quality blast materials. Abrasives Inc. 800-584-7524


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com


BASF
New resins from BASF will have metals loving water:

Excellent corrosion resistance, low VOC, high gloss, thin films basf.us/industrialcoatings
polyorders@basf.com
800-231-7868


Safway Services
Your Access Advantage. QUIKDECK®

Provides safe, factory-floor-like working conditions. Can be engineered to fit almost any shape, structure or size. Modular platform easily assembled from just a few basic components. Excellent containment. Applications include vessels, offshore rigs and bridges.

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2016, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com