P91 Pipe Failures (Brand -> Made in China)

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P91 Pipe Failures in China

(04-Jan-2007) - Please be

aware that failures of P91 (high strength 9 Chromium - 1 Molybdenum) piping

material have been reported in China. According to the sources,

these failures have resulted in 6 fatalities

the manufacturing quality of the pipework is suspect and

the failures occurred within 8 weeks of being placed in to service

the P91 pipe is being referred to as " fake

pipe "

the failures have occurred only in China

the pipe was manufactured in China

some of it was marked as having been manufactured in Houston, Texas, but it was not

the pipe was hot expanded, which caused cracking, and

failed after 6 to 8 weeks of service

some of this pipe may have been shipped to the US and elsewhere

Attached below are photos.

There is not much more detail on the problem at this time.

The purpose of this news story is to raise awareness of the potential for

counterfeit P91 material in our global market. This material is typically

used in power plants and power facilities. It is suggested that anyone

purchasing this piping material for their project validate its source.

Perform Positive Material Identification (PMI) and contact your supplier

and the mill or manufacturer and ask for validation by markings, heat number,

size and quantity. Do not trust Material Test Report (MTR) documentation

only.

Update (08-Jan-2007) - Additional information about this alert is as follows:

The failure occurred in ASTM A335 P91 - 18 " OD,

1.693 wall seamless pipe (that is believed to be counterfeit).

The pipe was operating at 2538 psig and 1006°F.

The failure occurred in a vertical section and was

86 " from the nearest weld. The longitudinal rupture was

35 " by 1.5 " to 2 " .

It is believed that pipe was billeted by mill in China who sold to Chinese firm that extruded and heat treated

the pipe. The pipe was then sold again to another firm who polished

the OD and sized the ends.

A formal investigation is being conducted by the Chinese

government.

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