Unsuitable
Type

Occurrences

Causes and Countermeasures

Leakages

Leakage occurs due to scratches on the surface of the pipe.(Small amount of leakage occurs, leakage and stoppage are repeated)

• O-rings fail to maintain airtightness due to rough handling or foreign objects (sands, etc.) stuck on the surfaces.

- Attention should be paid not to cause damages to pipes while handling.

Foreign objects are stuck between the O-ring and the surface of the pipe.

• With lubricants applied on the O-ring, leakages occur due to foreign objects like a hair stuck on the surfaces

- Clean the surrounding areas and check for any foreign objects before starting working.

O-ring is torn.

• Using saws or any other tools than exclusive cutters to cut pipes can result in sharp edges of pipes, leading to damages to the O-ring.

- The exclusive cutter should be used while cutting the pipe.

• O-ring can be heavily pressed and torn during the de-plumbing works of connections.

- Attention should be paid during reassembly.

The pipe joined to the fitting is bent at a sharp angle.

• Leakages can occur in the O-ring when the pipe is directly bent from the fitting.

- Avoid bending of pipe during piping work.

Separation of
the Pipe

Eccentricity generated in the grab ring.

• The grab ring comes off due to reuses.

- Once used, a grab ring should not be reused.

• Coming off when unscrewing the cap and inserting the pipe.

- The cap should be manually screwed to insert the pipe.

• Separation due to de-plumbing

- Connect the cap after driving in the parts first

No trace of the insertion of the grab ring

• Short of a 2-step insertion, the pipe is inserted to the O-ring only.

- Take advantage of the insertion mark.

Insertion of the support sleeve failed

• It failed to support the pipe and came off.

- Ensure it is properly inserted.

Bursting or
Rupture of
the pipe

White stretched marks are seen on the ruptured area

• Steam generated by the overheating of the boiler causes rupture.(melting point- 126℃)

- Check the boiler and instant heater.(Without clearing the root causes, it can reoccur.)

A lengthy rupture occurred on the pipe as if it were cut by a knife.

• It occurs due to the water pressure, when a shock is given to the pipe pressed by water.

- Pay close attention to the external shocks when conducting water pressure examination after plumbing.

• Pipes can be ruptured by shocks and excessive pressure during the winter season.(Check on freezing and bursting.)

- Handle pipes with caution as they become vulnerable to shocks in low temperatures.

Pipes are melted and ruptured

• Pipes can be melted and ruptured by arc welding sparks or cigarettes.

- Made of chemicals, pipes are very weak to direct heat, calling for special attention during conducting other works.

Pipes are swollen and ruptured

• Pipes are ruptured due to water hammering generated by hurried handling at the water pressure motor and the malfunctioning of the gauge.

- Please ensure the gauge is exactly at 0 point, and refrain from using those motors that can momentarily generate water hammering.(use high-capacity pressure gauge.)

• When contacted with petrochemical materials(gasoline, kerosene), the PB pipes can get hardened(physical property changed) or corroded(ruptured).

- Please ensure no petrochemical materials get in touch with pipes before/after plumbing work.

Cracks generated in and out of the pipes

• When contacted with iron rust, the PB pipes can get cracked due to radicals of the metal materials.

- Please make sure the PB plumbing materials do not directly contact with the rust generating materials.(ex: binding wire) during plumbing works.

Erosion of pipes and fittings

• PB piping material erosion occurs when it comes into contact with salt(NaCl).

- Be careful not to come into direct contact with water containing salt. (eg sea water)