Distinguish ownership, tightness and remaining life, then check route protection and the entry into the building.
The service pipe carries LPG vapour from the storage vessel towards the building. Its condition matters even when the connected appliances work normally. These examples use small bulk installations; identify the actual supply and work within the competence needed for the equipment and task.
Establish ownership before arranging maintenance
A supplier commonly owns the tank while the property owner owns the connecting pipe. The supplier having installed it does not decide who owns it. Read the supply agreement and confirm the arrangement with the supplier and, for rented premises, the landlord.
The pipe owner must arrange suitable inspection and maintenance. A competent person sets the next inspection interval from the condition found, previous findings, time since inspection and work already carried out. A refill schedule or boiler guarantee is not a maintenance plan for the service pipe.
Separate tightness from remaining life
A leak test checks whether gas escapes under the conditions of that test. It does not measure the wall thickness left in a buried steel pipe, or tell you how long the pipe will stay sound. A pipe can be gas-tight today while corrosion is advancing below ground.
Old protective wrapping is not permanent. Damaged or deteriorating protection can leave the buried metal exposed to the soil. Arrange assessment and replacement with a suitable non-corroding material, such as polyethylene, where the replacement route remains underground. Renewing tape at the visible ends leaves the hidden length unresolved.
An effective condition examination of buried metal requires careful exposure and assessment by people competent in pipe corrosion. Plan excavation safely so the pipe and its protection are not damaged. Good-looking ends, burner readings and checks at the tank cannot tell you the condition along the buried length. This note is not an instruction to dig beside a live service without the right planning and precautions.
Protect the route
A route above ground can make inspection easier, provided it avoids foreseeable damage and excessive temperatures. Provide barriers where vehicles could strike exposed pipework.
For an underground run:
- Keep a reliable record of its position and mark the route where possible.
- Before groundworks, locate the service and communicate its position to the work team. Use appropriate service-location and safe excavation methods rather than relying on a plan alone.
- Assess any proposed crossing by vehicles or other heavy loads. Suitable load-bearing slabs or covers protect against weight; warning tape and painted marks do not carry that load.
Inspect the change from ground to building
A polyethylene riser needs suitable protection against impact and sunlight. The glass-reinforced plastic sleeve described for this arrangement shields the emerging pipe from physical damage and ultraviolet exposure, which can make polyethylene brittle.
The small bulk arrangement takes the service into the building above ground, with a transition from polyethylene to steel or copper before entry. The wall penetration needs suitable sleeving and sealing to the structure; cavity walls need protection against gas reaching the cavity. This is the bulk-service arrangement being described, not a statement that every non-metallic entry permitted under other provisions uses the same detail.
Recheck the entry if paving, a garden or a yard level has been raised. An opening that was originally visible can become buried. Have the changed arrangement assessed and corrected; satisfactory burner operation does not prove that the new ground level is acceptable.
Recognise the pressure boundary
An intermediate-pressure run between two regulators differs from the final low-pressure supply to the appliances. For a comparable leak opening, a higher driving pressure can release more gas. The quantity also depends on the opening and supply conditions; a low-pressure escape remains dangerous.
Identify both regulation stages, the operating pressures and the section involved before selecting a test method or doing work. The separate regulation note shows how moving the final stage changes which pressure the service pipe carries.