Safety at gas receiving station
As a connected party and owner of the connection building, you are responsible for safety. The safety regulations in the European Directive on safety in potentially explosive atmospheres (ATEX) apply to the installation in the gas receiving station as well as the space in which the installation is installed.
In the interests of safe working practices, you should always inform Gasunie of works within the zone. You can contact our operational work preparation personnel for that. For the telephone numbers, see “Safety Contact”.
Classification of the building and consequences for electrical equipment
The safety classification for indoor spaces and the associated standards depends on the ventilation factor of these spaces (the number of times per hour that the content of the space is ventilated). Almost all gas receiving stations are ventilated less than five times per hour. Consequently the gas pressure regulation space is classified as zone 1. The space within a one metre radius of the ventilation openings and door openings on the outside of the gas pressure regulation space also comes within zone 1.
Gasunie has produced drawings of the zones at the station, on which gas pressure regulation space and the outside up to one metre away are classified as zone 1. This has consequences for the equipment used in this zone. Gasunie ensures that its installation complies with these regulations. It is your responsibility to ensure that the part of the installation that you own complies with the regulations.
Gasunie has the complete electrical installation at the station tested once every 8 years. Gasunie will inform you of any defects in your installation and will ask you to rectify them.
An overview of the applicable standards is given in "Normen industriële installaties" and the "Overview of European standards and developments in standards which have been harmonised with the Pressure Equipment Directive".
All Dutch standards can be ordered from the website of the Netherlands Standardisation Institute NEN www.nen.nl. On www.euronorm.net there is a great deal of information about legislation and standardisation.
It provides an excellent summary of the European standards applicable to industrial gas installations.
On the website of the "Raad voor Accreditatie"* (www.rva.nl) you will find the organisations which are accredited for the relevant area.
Search on the scopes:
- Organisation country = Nederland
- Search in contents of scopes = Drukapparatuur
Note that not all organisations shown here perform inspections.
* The "Raad voor Accreditatie" has been assigned under the "Wet aanwijzing nationale accreditatie-instantie (Wanai)" as national accreditation authority.
Your gas installation connection and gas installation must not constitute a hazard that could disrupt the operation of the national gas transmission network. To comply with section 2.9 of the Connection Conditions for Gas - NNO, you must take the following measures in your own gas installation connection. Failure to comply with this condition means that section 2.10 of the Connection Conditions for Gas - NNO apply. Protective measures are taken in the gas receiving station to protect the connected party's gas installation from too high gas pressure.
The design pressure must always be higher than the pressure of the gas supplied to you by Gas Transport Services. This is necessary because the regulated pressure is protected in the gas receiving station by a blow-off safety feature and 1 or 2 cut-out safety features. A margin is necessary to ensure that this is set up to operate safely.
The table below gives the relation between supply and design pressure (MOP; maximum operating pressure and the maximum outlet pressure (MIP; maximum incidental pressure) of the GOS.
Gas receiving station - Gasunie Possible highest setting of safety features in the GOS Outlet pressure (Pu) Normal supply pressure MIP (max. incidental pressure outlet side) bar bar 0,5 t/m2,0 4,4 > 2,0 t/m4,0 6,6 > 4,0 t/m8,0 11,0 > 8,0 t/m13,6 17,6 > 13,6 t/m15,0 22 > 15,0 t/m17,0 22 > 17,0 t/m22,5 27,5 > 22,5 t/m38,0 44 40 (open pijp) 46 (1.15 X MOP) 80 (open pijp) 92 (1.15 X MOP)
The minimum design pressure of your gas system depends on the highest setting (MIP) of the safety features in the gas receiving station and on the chosen design code/standard for your system. Based on these data, a notified body (NoBo) must determine what the design pressure of your gas system should be.
A supply pressure as shown in the first column is agreed with you (see table under; How high should the design pressure of the gas installation connection and the gas installation after the gas receiving station be?.
The table shows the maximum pressure allowed in the pipeline in the event of an incident.
You must ensure that the design pressure of your pipeline system is suitable for this MIP. If appliances are connected to this system which do not normally work if the gas pressure approaches the MIP (see 2nd column), then these appliances must be protected against this. This can be done by means of electric or mechanical safeguards against overpressure.