About: http://webisa.webdatacommons.org/285111498

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Additional water is added until the hydrostatic pressure reaches a predetermined amount, such as about 4500 psi, at which pressure, the material 50 is blown out of the cement ports 48.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es