Where possible from a Health & Safety perspective, we will seek to avoid man entry into confined spaces. For those instances, where no safe alternative exists, we have developed a safe and efficient process for managing man entry surveys and the subsequent schedule of work. The objectives and outputs of the investigation are similar to CCTV surveys, however we find that the human eye is more accomplished in identifying and investigating defects than cameras.
What it involves?
Flow monitoring, weather monitoring and gas detection systems are established before and throughout the schedule of works. A safe system of work is set out to enable the survey to be completed and to allow the surveyors to perform their work including creating a quick and safe evacuation procedure; this is supported by PPE including breathing apparatus where necessary. The survey is itself thereafter is relatively straightforward.
- Strict compliance to national, customer and site-specific protocols is critical for all man entry work
- All relevant parties must be informed of the team’s arrival and agreed timetable for work
- Emergency service communication lines must be confirmed
- The access and egress areas must be appropriately secured and guarded
- Pre-entry checks should be made, including checking functionality and certification of rescue equipment
- Entry checks should be made, including gas and air tests, effluent depths, flow rates and communication channel effectiveness
- Survey and exit.
- Minimum 1200mm diameter pipe
- Safe chamber access/entry and exit in relation to size of pipe, chamber and equipment being used
- Known flow rates and depths in different weather conditions
- Over-pumping / tankering for high flows
What You Gain from a Man Entry Survey
It is rare for very large sewers and tunnels to be effectively surveyed by CCTV, so it is necessary to a team of specialists to complete the survey supported by a team that will manage their safety during the operation. The key to a successful pipe problem investigation and resolution is the initial investigation works which necessitates a detailed and quality inspection is vital. In contrast the subsequent report, plans, photos and video files are relatively straightforward to produce. The outputs are very similar to CCTV surveys; however, they are strengthened with a better perspective from the human eye.
On larger pipes diameter variations are more common and the nature of debris and deposits needs to be understood to facilitate their removal. Brick built pipes are commonly used and brick related defects like drop outs and mortar degradation require particular attention. Care has to be taken to identify defects in the bottom of the pipe which can be obscured by effluent / water and can include significant voids.
Why Choose McAllister Group for Man Entry Surveys
Approach – Safety is paramount. We do not take shortcuts or risks when working in confined spaces. We adhere to the industry standards but will attempt to comprehensively address what are clients need from the survey. Consequently, we will find out what the client wants/expects before presenting it in the format or formats that best suit that purpose.
People – Our site teams are highly experienced and qualified to Industry standards relating to working in Confined Spaces; they possess the expertise of deploying different entry types and have also received additional training and certification in the use of Breathing Apparatus (B.A.).
Partners – We work with mining and tunnelling partners where appropriate to provide additional equipment and skilled personnel where appropriate.