Fracture Arrest Conditions in Polyethylene (PE) Gas Pipes [PE]
# 1985 York
As polyethylene pipes increase in size above 250 mm, the
avoidance of high-speed brittle fracture propagation becomes
of overriding importance. More stringent operating and test
pressures have had to be introduced. A full scale test
programme on a variety of pipe sizes is being conducted by
British Gas. In this paper, the results on several 250 mm
SDR17.6 pipes are presented and in order to study the
phenomenon more closely, the fracture speeds and initial
decompression speed of the internal air pressure have been
measured. It was concluded that fracture propagation will
not occur in these British Gas pipes during pressure testing
at 3 bar and that, as expected, the strain energy theory is
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Author(s) : Ian Aldridge, Declan Robinson, Dave Smart, Chris Reed, Martyn, Greig, Trevor Stafford, David Christie-Lowe, Alec Erskine
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One of the main design criteria for limiting the operational pressures of polyethylene (PE) gas pipes is its resistance to rapid crack propagation (RCP). Below a critical pressure the crack arrests but above the whole pipeline may be fractured. The paper discusses the critical pressures measured during European and...
Operation of high density polyethylene (HDPE)
pipes at 7 bar has been very successful in
British Gas over the last few years. Using HDPE
pipes at higher pressures requires a high level
and correct balance of pipe properties of
strength, stress crack and rapid crack
Raised levels of jointing...
A novel die-drawing process has been developed at Leeds
University. By incorporating a mandrel, pipes may be expanded
hoopwise whilst being drawn axially. Such biaxially-oriented
pipes have properties better suited to the transmission of gases
and liquids than either isotropic or longitudinally-drawn pipes.
The catastrophic phenomenon of rapid crack propagation in 250 mm diameter polyethylene pipes has been investigated at a full scale test facility. Tests at +3°C were conducted with pipes, either completely fully of water or containing a small percentage of air. The safe, maximum pressures were measured.
gas pipe currently
its good stress