T&D’s online library of Drum, IBC & Tank Heating applications is now updated to include the following : heating product to allow it to be transferred to production.

Visit Silicone Heating Products for details of electric surface heating solutions – flexible silicone heaters can be applied to heat the most complex shapes, geometries, curves and pipes.

Specified Product Solution : Drum Heaters

HeatING JACKET Type

• Drum ✓
• IBC
• Bespoke

area Classification

• Safe Area ✓
• Hazardous Area (Zone 1 & Zone 2)

HEATING FLUID, MEDIUM, CONTENTS

• Water
• Oil
• Wax
• Chemicals
• Petrochemicals (Solvents, Detergents, Adhesives, Other)
• Food Ingredients (Liquid, Powdered, Granulated)
• Other ✓ Cosmetics

Chemical HEATING APPLICATION

• Frost Protection
• Reduce Viscosity
• Temperature Maintenance
• Low Temperature Heating (0-20 degrees Celsius)
• Medium Temperature Heating (21-50 degrees Celsius)
• High Temperature Heating (50 degrees Celsius+) ✓
• Other Heat Up

 

HEATING JACKET VOLTAGE

• 110 Volt
• 230 Volt ✓
• Low Voltage

HEATING APPLICATION : DRUM, IBC, TANK OR VESSEL

• 25 Litres
• 50 Litres
• 105 Litres
• 205 Litres ✓
• 1000 Litres
• Other

VESSEL MATERIAL

• Steel ✓
• Stainless Steel
• Plastic
• Cardboard
• Other

HEAT UP TEMPERATURE

• 0-5 degrees Celsius
• 5-20 degrees Celsius
• 20-50 degrees Celsius
• 50-70 degrees Celsius
• 70+ degrees Celsius ✓
• N/A (Frost Protection)

HEAT UP TIME REQUIREMENT

• 0-4 Hours
• 4-12 Hours ✓
• 12-24 Hours
• 24-48 Hours
• N/A

Contact T&D for specification, support and sales of Electrical Heating Equipment for safe, industrial and hazardous area plant and equipment – we provide process temperature heating and pipework frost protection (Winterisation) products for pipework, valves, IBC’s, drums and tanks. Complete range of heating cables and trace heating cables are available for process temperature maintenance.

T&D – Largest UK Stockist of Heat Tracing Cables. UK & International Delivery.

EXPERTS IN EQUIPMENT FOR EXPLOSIVE ATMOSPHERES

T&D are your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to your UK and international projects.

Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control 

Fans

Woodcock & Wilson are specialist manufacturers of independently certified fans – this includes portable ATEX & IECEx certified ventilation fans and high performance industrial versions for onshore and offshore applications.

In this series of 6 Articles we look to understand more about centrifugal, industrial, axial and 3rd Party Certified ATEX and IECEx fans for hazardous areas and explosive atmospheres

• Part 1 – What is a Fan?
• Part 2 – Fan Laws
• Part 3 – Fan System Problems
• Part 4 – Fan Performance Troubleshooting
• Part 5 – Troubleshooting – Balance & Vibration
• Part 6 – Fan Starting Issues
• Whitepaper – Hazardex 2020 Conference Paper – Non-Electrical (Mechanical) Equipment Compliance With IECEX Certification

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LEADERS IN ATEX INNOVATION

T&D are your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to your UK and international projects.

Key Product Groups

Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control 

 

• Article Written By Woodcock & Wilson | 6 of 6 Articles
  

Woodcock & Wilson are specialist manufacturers of independently certified ATEX fans and IECEx industrial fans for the ventilation of hazardous area locations and potentially explosive atmospheres.

Below is Part 6 in a series of 6 Articles by Woodcock & Wilson discussing fans, the laws, common problems, troubleshooting the main performance issues and getting your fan started again if you encounter any issues.

Electrical :-

• Motor wired incorrectly. Check fan wiring diagram
• Incorrect starter overloads or fuses. Check requirement with supplier
• Problems with electrical supply (possible low voltage due to cable length)
• Undersize motor. Check with supplier

Fan Mechanical or System :-

• Incorrect fan rotation
• Mechanical contact within fan (shaft rubbing on seal or impeller rubbing on inlet cone)
• Wrongly installed v -belt drive (loose pulleys or mis-aligned pulleys
• Impeller inertia too large for the motor stating torque
• Attempting to start the fan cold when it is only designed to run in its hot condition (Any dampers in the system can be closed to reduce the fan power absorbed)

LEADERS IN ATEX INNOVATION

T&D are your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to your UK and international projects.

Key Product Groups

Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control 

• Article Written By Woodcock & Wilson | 5 of 6 Articles
  

Woodcock & Wilson are specialist manufacturers of independently certified ATEX fans and IECEx industrial fans for the ventilation of hazardous area locations and potentially explosive atmospheres.

Below is Part 5 in a series of 6 Articles by Woodcock & Wilson discussing fans, the laws, common problems, troubleshooting the main performance issues and getting your fan started again if you encounter any issues.

Fan Mechanical, Balance & Vibration

A) Balance Grades & Categories
B) Possible reasons for excessive vibration during commissioning
C) Possible reasons for vibration experienced after successful commissioning

A) Balance Grades & Categories

Fan balancing and vibration is in accordance with BS848-7 BS ISO 14694. Woodcock & Wilson Ltd have selected “Fan application category: BV-3 for fans ≤ 37KW & BV-4 for fans > 37 kW.

The balance quality grade for these categories are G 6.3 & G 2.5 respectively. The tables below are taken from the above standard. They give vibration limits for tests in manufacturers workshop & recommended vibration limits for fans operating in situ.

Maximum Vibration Levels Limits for Factory Tested Fan

Fan Category Application Category	Rigidly Mounted mm/s		Flexibly Mounted (AV Mounts) mm/s
	Peak	r.m.s	Peak	r.m.s
BV-3	3.8	2.8	5.1	3.5
BV-4	2.5	1.8	3.8	2.8

Fan Vibration Limits For Fans Operating In Situ

Condition	Fan Application Category	Rigidly Mounted mm/s		Flexibly Mounted mm/s
		Peak	r.m.s	Peak	r.m.s
Start-up	BV-3	6.4	4.5	8.8	6.3
	BV-4	4.1	2.8	6.4	4.5
Alarm	BV-3	10.2	7.1	16.5	11.8
	BV-4	6.4	4.5	10.2	7.1
Shut-down	BV-3	12.7	9	17.8	12.5
	BV-4	10.2	7.1	15.2	11.2

The vibration levels on the table before are guidelines for acceptable operation of fans. The vibration level of newly commissioned fans should be at or below the “start up” level.

Historical data is an important factor when considering vibration severity. A sudden & maintained change in the vibration level may indicate the need for prompt inspection or maintenance.

B) Possible Reasons for Vibration Experienced During Commissioning

Fans test run and balanced in the manufacturers works and delivered as a complete, fully assembled fan.

Mechanical Problems

• Damage to fan during transport causing out of balance or misalignment problems
• Foreign bodies on impeller causing out of balance
• Fan pedestal distorted during installation causing drive chain misalignment
• Incorrect selection or fitting of anti-vibration mounts
• Loose holding down bolts
• Defective foundations

II) System or System Effect Problems:-

• The system has greater resistance to flow than anticipated resulting in the fan operating further up the characteristic in a stalled section. Depending on fan type, vibration may be experienced when operating in the stalled area
• On fans fitted with inlet vanes or inlet louvers on an inlet box, vibration may be experienced at lower vane angles due to a condition known as inlet cone vortex
• Bands or other obstacles fitted to the fan inlets may cause airborne instabilities resulting in vibration (see “V fan systems” in “underperforming” section

Fans not previously run:

All previous possible reasons + the following:-

• Impeller out of balance
• Faulty or wrongly fitted bearings
• Motor out of balance
• Shaft misalignment in bearings
• Coupling misalignment (on direct coupled fan)
• Pulley misalignment or loose belts (on v belt driven fan)
• Bent shaft
• Components Looseness (impellers, pulleys, couplings etc.)
• Failed impeller
• Shaft flexural critical speed
• Shaft torsion critical speed

C) Possible reasons for increased vibration levels after successful commissioning:

• Dust of product build up on the impeller
• Impeller deterioration due to wear or corrosion
• Fan bearing deterioration
• Components looseness (impellers, couplings, pulleys, etc.)

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LEADERS IN ATEX INNOVATION

T&D are your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to your UK and international projects.

Key Product Groups

Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control 

• Article Written By Woodcock & Wilson | 4 of 6 Articles
  

Woodcock & Wilson are specialist manufacturers of independently certified ATEX fans and IECEx industrial fans for the ventilation of hazardous area locations and potentially explosive atmospheres.

Below is Part 4 in a series of 6 Articles by Woodcock & Wilson discussing fans, the laws, common problems, troubleshooting the main performance issues and getting your fan started again if you encounter any issues.

Fan Performance Troubleshoot

Reasons For Fans Underperforming

• Fan running in the wrong direction
• Fan running at the wrong speed
• Fan incorrectly manufactured
• Fan wrongly selected
• Fan system problems

Fan Running in the Wrong Direction

While the fan is running up or coasting to a stop, check that the rotation is correct relative to fan type and discharge orientation. Check that the impeller handling is correct for the selected rotation. Examples for centrifugal and axial fans are shown below.

Fan Running at the Wrong Speed

• Check the required running speed with the supplier. (Note: If the fan is v belt drive the final running speed may be different from the original selected speed due to the use of standard pulley diameters
• Measure actual fan speed with tachometer or other instrumentation
• If the fan is operated via an inverter, the fan may be designed to run at specific speed (motor frequency) other than 50 or 60 Hz. If the fan is v belt drive the motor frequency will probably not be the fan speed

Fan Incorrectly Manufactured

This will be unusual but must be considered as part of a fault diagnosis.

• Wrong impeller handing in fan case (see above)
• Wrong pulleys fitted, giving wrong speed
• V belt drive wrongly tensioned causing slip & resulting in wrong speed
• Wrong internal clearance between impeller & inlet cone or wrong tip clearance between blades & fan case on an axial fan

Fan Wrongly Selected

Again this will be usual but must be considered as part of a fault diagnosis.

Check that the fan has been selected in accordance with the specification and requirements.

This may include the following:

• Selection pressure not referred to the correct section ie -ve on inlet +ve on discharge or a combination of both
• Selection pressure not referred to the correct temperature or altitude
• Selected fan not taking account of existing or required inlet & discharge duct sizes
• Selected fan oversized relative to available space constraints (this may lead to bad inlet & discharge conditions).
• Wrong running speed selected ie 50Hz instead of 60hz & vice versa on direct driven fans

System Problems

• Fans will only meet the duty point shown on the performance curve under ‘ideal’ installation conditions
• Ideal conditions are seldom obtainable in practice consequently there will always be some ‘SYSTEM EFFECT‘

Factors That Influence System Effect

• Elbow or bend too close to fan inlet or outlet
• Abrupt duct transition
• Pre swirl of the incoming air due to duct design (swirl in same direction as rotation
• Dampers not fully open
• Damper location
• Poorly designed fan drives – large drive pulley – solid rather than spoked
• Fan inlet box design
• Bend orientations at discharge
• Free discharge – abrupt expansion
• Weather cowls and hoods

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LEADERS IN ATEX INNOVATION

T&D are your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to your UK and international projects.

Key Product Groups

Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control