Rowan House Ltd: Engineering and Process Safety Consultants
Rowan House Ltd, 32 Raddle Wharf, Ellesmere Port CH65 4FY, Cheshire
Tel: +44 (0) 151 355 3588 • Email:

Hazard and Risk Assessments

As part of managing the health and safety of your business you must control the risks in the workplace. To do this you need to understand the risks present in your workplace, decide what might cause harm to people and decide whether you are taking reasonable steps to prevent that harm.

The potential risks present in the work place are often impacted by the process, the equipment, operating conditions, human factors, and the maintenance regime of the facility.

Rowan House Ltd has extensive experience of using risk identification methodologies for managing risk across different industries. Our consultants have the requisite expertise needed to effectively deliver projects using the following risk identification methodologies: HAZID, HAZOP, ALARP, SIL and COSHH. Our consultants include IChemE registered Professional Process Safety Engineers.

Definitions of methodologies:

HAZID: A HAZID study is used early in the design stage as soon as process flow diagrams, draft heat & mass balances, and plot layouts are available. A HAZID allows identification of any potential deviations from the intended design at an early stage, therefore preventing expensive corrections in the future.

Rowan House Ltd can provide an Independent HAZID Chair, a meeting Secretary, Specialist Recording Software and all administration leading to the final HAZID report.

HAZOP: A HAZOP study is carried out once the detailed design is complete and before the final placement of orders. It is a well proven structured team based risk assessment method that makes detailed examination of the process and engineering intention of new or existing facilities. The HAZOP is a vital tool in the identification process for the need for Safety Instrumented Function, (SIF) and with suitable guide words can meet the requirements of the DSEAR/ATEX 137 risk assessment.

Rowan House Ltd offers a complete HAZOP service providing an Independent HAZOP Chair, a HAZOP Secretary, Specialist HAZOP Recording Software and all administration leading to the final HAZOP report.

Rowan House Ltd also offers experienced engineers for design review / client project meetings ensuring that an overview of all health and safety issues is available at these meetings.

SIL Assessments: Failure of Safety Instrumented Systems (SIS) could harm people or the environment and a SIS is often the last layer of defense against critical safety, environmental and economic losses.

Rowan House Ltd staff have the skills and experience needed to ensure full compliance to IEC61508 & IEC61511 for your Safety Instrumented Systems (SIS), covering all aspects of SIS design, installation, operation, maintenance and de-commissioning.

Rowan House Ltd can assist with the full safety lifecycle of functional safety requirements including:

  • Calibrated Risk Graph Development
  • Hazard and risk assessments to identify requirements for risk reduction;
  • Safety Integrity Level (SIL) Assignments to assign a target SIL for each Hazard using Layer of Protection Analysis (LOPA), and a calibrated risk graph;
  • Development of a Safety Requirements Specification, defining all of the requirements and special considerations for each Safety Instrumented Function (SIF).

CHAZOP: Control HAZOP (or Computer HAZOP both shortened to CHAZOP) is the same process as process HAZOP with the specific task of assessing the risks involved in control systems deviating from their intended function. It will cover hardware - from field to control room including networking; software - from operating systems on the DCS/PLC/Operator Workstations to application programs; power supplies and environmental effects on the whole system. It can also include an alarm review - though this can also be carried out as a separate exercise.

Rowan House Ltd provides this service for small, medium and large projects. Our extensive experience of complex control strategies as well as control system security all bring benefits, meaning and value to the control system that you finally receive.

Rowan House Ltd also brings accident investigation knowledge to the control system design that raises the quality and integrity of the system architecture and software design of the delivered system. This results in ease of use, clarity of information presentation and good performance for your process plant.

DSEAR Assessments: Rowan House Ltd has used their considerable experience in safety to develop a range of customer support packages to enable your company to understand, apply and meet the requirements of UK Health and Safety Legislation, in particular DSEAR.

Under the DSEAR, employers must:

  • find out what dangerous substances are in their workplace and what the risks are;
  • put control measures in place to either remove those risks or, where this is not possible, control them;
  • put controls in place to reduce the effects of any incidents involving dangerous substances;
  • prepare plans and procedures to deal with accidents, incidents and emergencies involving dangerous substances;
  • make sure employees are properly informed about and trained to control or deal with the risks from the dangerous substances;
  • identify and classify areas of the workplace where explosive atmospheres may occur and avoid ignition sources (from unprotected equipment, for example) in those areas.

Rowan House Ltd can provide the support you need to ensure that you comply with DSEAR and offer DSEAR Training, DSEAR Studies, ATEX Zoning (Hazardous Area Classification) and DSEAR Audits.

Dust Explosions and Dust Fire Hazards: Rowan House Ltd has been closely involved in the UK with writing the guidelines for dust explosions in drying applications in the Water Industry as well as being involved in the revised HSE guidance "Safe Handling of Combustible Dusts".

We can support your company by minimising your exposure to dust explosions risks through counter measures, process design, operations, advice, risk assessments and hazardous area zoning.

Rowan House Ltd can provide extensive experience in assisting clients with the prevention of dust explosions and the choice and installation of systems for the prevention of such dust explosions. There is also considerable experience of investigating dust explosions and identifying how these could and should have been prevented.

Rowan House Ltd can support your business by minimising your exposure to dust explosions risks through counter measures, process design, operations, advice, risk assessments and hazardous area zoning.

COSHH Assessments: COSHH is the Control of Substances Hazardous to Health Regulations and these regulations are related to the EU’s Chemical handling directives. The main requirement is to catalogue all chemicals that are being handled, minimise their impact by practical means wherever possible and to maintain comprehensive safety information. It is therefore sensible to build up a library of chemical suppliers' material safety data sheets (sometimes referred to as MSDS) which are readily available from all suppliers of chemicals.

Rowan House Ltd is well positioned to help you gather the chemical safety data that is needed and make the appropriate risk assessments for developing a strategy to optimise safety in the workplace.

For more information on our Hazard & Risk Assessments, please contact us.

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