Gas Pipework Installation Quiz no4

The maximum interval between horizontal pipework supports for 15 mm copper gas pipework installed between solid timber joists is:

• 1.0 m.

• 1.5 m.

• 2.5 m.

• 3.5 m.

The minimum size solid timber joist that can be notched for a gas pipe is:

• 50 mm.

• 75 mm.

• 100 mm.

• 150 mm.

Where gas pipework is buried in a floor screed, what is the minimum cover above the pipe?

• 5 mm.

• 10 mm.

• 25 mm.

• 100 mm.

Gas pipework installed behind dry lining shall:

• Be made of steel only.

• Need no additional protection.

• Be suitably wrapped in tape only.

• Be suitably encased by building material.

Gas pipework installed within walls of timber frame and light steel-framed construction shall:

• Be made of steel only.

• Have only welded joints.

• Be left unsupported to allow for movement.

• Be run within purpose-designed channels or ducts.

Above ground external gas pipework shall be protected against:

• Painting

• The weather

• The risk of mechanical damage

• The risk of unauthorised alterations

Polyethylene (PE) gas pipework in private gardens, with no vehicular traffic, shall have a MINIMUM depth of cover of:

• 375 mm with marker tape between 75 mm above the pipework

• 450 mm with marker tape between 75 mm above the pipework

• 375 mm with marker tape between 100 mm and 300 mm above the pipework

• 450 mm with marker tape between 100 mm and 300 mm above the pipework

Gas pipework shall not be installed under the foundations of a building unless:

• Steel pipework is used

• Buried 40 mm below the base concrete

• Adequate steps are taken to prevent damage to the pipework

• Polyethylene (PE) pipework is used and wrapped in corrosion resistant tape

For buildings containing flats and/or maisonettes gas pipework shall be fire stopped as it passes from one floor to another:

• Unless constructed from welded steel

• Only for buildings with three or more storeys

• Only when they are in excess of 15 mm copper or ½” steel

• Unless installed in its own protected shaft that is ventilated top & bottom to outside air

Gas pipework passing through a protected area shall NOT be of what type of material?

• Continuous length of copper

• Copper containing only mechanical joints

• Steel pipework with screwed or welded joints

• Continuous length of pliable corrugated (stainless steel) tubing (manufactured to withstand fire test A of BS EN 1775)