BS 6891:2005 pdf download

5 Design and planning

5.1 Exchange of information and time schedule

5.1.1 At the initial stages of building design and planning the designer/installer shall verify that the

installation pipes will be adequate for both immediate and probable future requirements. A time schedulefor fixing the installation pipes shall be agreed as early as possible and any subsequent changes notified tointerested parties at the earliest opportunity.

5.1.2 All necessary information regarding the routing of installation pipes and positions of valves andtermination points to serve the appliances shall be made available to those concerned as early as possibleby means of drawings,specifications and consultations,as appropriate.

COMMENTARY AND RECOMMENDATIONS ON 5.1.2

Any drawings should also include:

a) the position of voids, shafts, ducts, and channels when installation pipes are to be concealed;
b) special requirements of a precautionary nature, e.g.limitations on proximity to other services;
c) sizes, and materials and position of all installation pipes and fittings.

5.1.3 Any installation pipe fitted as construction of a building progresses,and which will subsequently beinaccessible, shall be tested for gas tightness in accordance with Clause 10 before being buried, covered orwrapped.

5.1.4 Any work to be done by the gas installer and which could be damaged or impaired by other tradesshall be clearly identified.

5.2 Pipe sizing

5.2.1 When designing an installation, the sizes of all installation pipes shall be determined from themaximum gas rate of the appliances to be connected.