Training and Safety

Question Checklist for Hazards

  • How is the task going to be performed?

    Please refer to the Method Statement for Pipe Cleaning page.

  • What skills are required to perform the job; is additional training or supervision required?

    Trained personnel from VELTRUP Technik Philippines, Inc. will perform the job. VELTRUP personnel must attend safety training by the Customer to ensure knowledge and awareness of safety rules and precautions, including general safety and operating procedures as well as safety rules specific to customer. A Technical Support Manager from abroad will join for difficult applications.

    VELTRUP Supervisors are all licensed Mechanical Engineers must brief supervising representatives from Customer on specific hazards introduced by the VELTRUP Roto-Fan® System. Appropriate safety precautions to minimize risks must be implemented with the agreement and consent of Customer before proceeding with the job.

  • When is the task to be performed, could it be carried out at a more appropriate time (e.g. shutdown)?

    Pipe cleaning jobs are usually performed at shutdown since pipes have to taken out of operation. One of the advantages of the VELTRUP Roto-Fan® System is in-situ cleaning with minimal need for dismantling of pipes.

    If pipes are dismantled, then pipes may be moved to a proper cleaning area. In this case, pipe cleaning may be performed at any time.

  • Where is the task to be performed, could it be carried out in a safer location?

    Usually, pipe-cleaning jobs are performed in-situ. In most cases, cost savings result from minimizing the need for dismantling pipes.

    Hazards from the high-pressure water used are at the point of entry and the point of exit. Once the nozzle and high-pressure hose is traversing the inside of the pipe, the high-pressure water is confined within the pipe and there is no hazards introduced.

    The discharge water will carry debris from the pipe-cleaning operation. It is important to ensure that no chemical, physical or biological hazards are introduced by the mixing of water with the debris. Appropriate measures to handle the discharge water must be implemented in consultation with the Customer. It is advisable that the Customer provides according collection units (e.g.container in case of large volumes of incrustations). Alternatively, VELTRUP Technik Ltd. can also provide.

  • Are there any simultaneous operations, which have a significant safety impact on the task (e.g. other tasks occurring as part of the same work scope, or other work in the adjacent area)?

    High-pressure water will disperse into a fine spray beyond a distance of three (3) meters. No electrical or hot work should be carried out within a distance of ten (10) meters from the point of entry and point of exit of the high-pressure nozzle and hoses.

    A safe distance of three (3) meters from the VELTRUP Pump Unit will ensure safety for other workers. Prevailing wind directions should be taken into account when deciding if water spray will affect electrical and hot work.

    For operations on upper floors, there will be some spillage of water onto lower floors. Electrical and hot work should not be carried directly below the pipe to be washed.

  • What hazards materials are involved (e.g. chemicals, combustibles – the materials within the system being worked should be taken into account)?

    Only water from the hydrant supply is used whenever possible. There is no chemical added to the water. In case hydrant systems cannot be used or are not available, then supply from water tank shall be arranged. Other sources of water supply shall be discussed in detail with the Customer's representative.

    In water pipes, the discharge water will carry debris from the cleaning operation. This mixture will not present any chemical hazards. Depending on the pipe size, the debris will be discharged at a speed that may result in solid debris flying about. This risk is minimized by ensuring the points of entry and exit of the water is cordoned off and shielded. Any personnel approaching the points of entry and exit must have proper PPE attire, especially eye goggles, ear protection and clothing.

    For pipes conveying other materials, it must be determined that the mixture of water with the materials involved does not result in a mixture that presents chemical, physical and/or biological risks. This must be done in consultation with the Customer’s technical representatives. Appropriate procedures for handling and collection of the debris must be implemented before proceeding with the cleaning operations.

    The VELTRUP high-pressure pump unit has engines that are diesel driven. A fire extinguisher is located in the unit. Additional fire extinguishers can be placed around the unit if the risk of a fire is perceived to be high. Normal precautions with diesel engines will be sufficient in most locations.

  • What hazards are introduced by tools and equipment to be used?

    Hazards introduced are:

    • High pressure water
    • Flying solid debris
    • High noise level
    • Rotating hoses and machinery
    • Possible spark emission from diesel engines.
  • What hazards are introduced by the circumstances of the job to be performed (e.g. day/night, exposure to weather, in a shutdown, simultaneous operations, etc.)?

    On night operation, proper lighting has to be provided so that leakage from hoses can be easily detected.

    During heavy rain, it will be difficult to detect leaks from hoses, the Engineer may decide in this case to temporarily suspend operations. The VELTRUP Roto-Fan® System can operate normally in adverse weather conditions.

    Under very hot conditions with the use of a spark arrestor fitted to the exhaust, it is possible for the diesel engine to operate at much higher temperature than normal.

    In case the water supply is taken from a shallow pond, it is possible for water supply temperature to exceed 350 Celsius. The VELTRUP Roto-Fan® System incorporates a temperature sensor that does not allow operation where intake water temperature exceeds 350 Celsius. The pressurization of the water results in an increase in temperature of about 200 Celsius. This is to prevent the possibility of scalding from the discharge water as well as to protect the pump mechanism and transmission. During a shutdown, simultaneous operations by many contractors may be carried out in the same location. There is a possibility of non-relevant workers wandering into the high-pressure jetting work area for whatever reasons. The VELTRUP work area must be clearly marked and cordoned off to avoid this possibility. The VELTRUP supervisor will position himself so that he is able to observe the work area at all times. The high-pressure water can be terminated within one second upon operation of the remote control held at all times by the VELTRUP Supervisor.

  • Are there any location related hazards (e.g. working at height, in confined spaces, below ground, etc.)?

    Yes. When working at height, in confined spaces and below ground, the VELTRUP work area must be cordoned off to ensure controlled and restricted access. High-pressure water should be turned off before inspection or working in such locations. The VELTRUP Supervisor must be in control of the remote control at all times or for prolonged stoppages, the VELTRUP high-pressure pump should be switched off.

  • Are there any installation related hazards (e.g. pressurized systems, extreme temperatures, etc.)?

    Yes. Water with pressure up to 1,000 bars are in use.

    Pressurized water will have a temperature of about 500 Celsius. While this will not cause scalding, it can be unpleasant. The VELTRUP high-pressure pump unit has built-in safety sensors to prevent the generation of pressurized water exceeding a temperature of 550 Celsius.

    Rotating high-pressure hoses are used. All personnel must keep a distance of at least three (3) meters from rotating hoses. Rotating hoses must be free of frayed or broken armor strands. Rotating hoses should be placed so that in normal operation, it does not rub against one spot continuously. The hose are designed to wear uniformly. Improper setup may result in a hose rubbing continuously at one spot. This can accelerate wear at the spot and result in a high-pressure water leak.

  • Are there any adjacent areas (e.g. below, above, to the side) on which the task may have an impact?

    Water may spill onto lower areas. Electrical and hot work should not be carried out in such areas. The equipment should be set-up so that discharge water can be directed to the drainage system and/or collected.

  • Are there any safety systems involved whose function/availability may be impaired?

    Possible. If any electrical control panels are within three (3) meters of the work area, wetting from the cleaning operation may result. The electrical control panel should be adequately covered or switched off. Consultation and advice from Customer is necessary to ensure adequate safety procedures are implemented before proceeding with the cleaning operation.

    Water supply is normally taken from the hydrant system. The Customer’s Control Room personnel must be informed of the use of hydrant supply so that safety alarms are not triggered unnecessarily. The VELTRUP high-pressure pump unit requires a water flow rate of 200 liters per minute. In most cases, this will not affect the operation of the hydrant system adversely.

  • Does the task affect emergency contingency plans (e.g. restricting emergency exits, etc.)?

    Possible. Water supply of 200 liters per minute is obtained from the hydrant system. Customer’s consent is required before tapping this water supply to ensure no undue risk from using the hydrant water.

    Rotating hoses and stationary hoses may be laid through doorways and access routes. VELTRUP personnel must be thoroughly aware of emergency signals and evacuation procedures. In an emergency, VELTRUP personnel must turned off the VELTRUP high-pressure pump unit before evacuation.