A threaded pipe connection comprising: a tubular coupling with first and second female threaded zones (110a, 110b) formed in opposing sections; and first and second pipes, each comprising a male threaded zone and a shoulder surface at its terminal end, wherein each female threaded zone: extends from an inner end (115a, 115b) to an outer end (116a, 116b), wherein the inner end (115a, 115b) of each threaded zone (110a, 110b) is the end nearest the centre of the tubular coupling; and includes a female thread that tapers radially within the female threaded zone (110a, 110b) from a maximum diameter at the outer end (116a, 116b) of the female threaded zone (110a, 110b), wherein each male threaded zone includes a male thread that tapers radially so as to reduce in diameter towards the terminal end of the pipe, wherein the threaded pipe connection is configured to enable the first and second pipes to be engaged with the tubular coupling in a made-up configuration in which: the shoulder surfaces of the first and second pipes abut; the entire male threaded zone of the first pipe engages the entire first female threaded zone; the entire male threaded zone of the second pipe engages the entire second female threaded zone; and for each of the first and second female threaded zones (110a, 110b): the crest (154, 254) of one of the male and female threads radially interferes with the root (251, 151) of the other of the male and female threads in a first portion of the female threaded zone (110a, 110b) and does not interfere or interferes by a smaller amount in a second portion of the female threaded zone (110a, 110b); and the second portion is located at the inner end (115a, 115b) of the female threaded zone (110a, 110b). a tubular coupling with first and second female threaded zones (110a, 110b) formed in opposing sections; and first and second pipes, each comprising a male threaded zone and a shoulder surface at its terminal end, extends from an inner end (115a, 115b) to an outer end (116a, 116b), wherein the inner end (115a, 115b) of each threaded zone (110a, 110b) is the end nearest the centre of the tubular coupling; and includes a female thread that tapers radially within the female threaded zone (110a, 110b) from a maximum diameter at the outer end (116a, 116b) of the female threaded zone (110a, 110b), wherein each male threaded zone includes a male thread that tapers radially so as to reduce in diameter towards the terminal end of the pipe, wherein the threaded pipe connection is configured to enable the first and second pipes to be engaged with the tubular coupling in a made-up configuration in which: the shoulder surfaces of the first and second pipes abut; the entire male threaded zone of the first pipe engages the entire first female threaded zone; the entire male threaded zone of the second pipe engages the entire second female threaded zone; and for each of the first and second female threaded zones (110a, 110b): the crest (154, 254) of one of the male and female threads radially interferes with the root (251, 151) of the other of the male and female threads in a first portion of the female threaded zone (110a, 110b) and does not interfere or interferes by a smaller amount in a second portion of the female threaded zone (110a, 110b); and the second portion is located at the inner end (115a, 115b) of the female threaded zone (110a, 110b). the shoulder surfaces of the first and second pipes abut; the entire male threaded zone of the first pipe engages the entire first female threaded zone; the entire male threaded zone of the second pipe engages the entire second female threaded zone; and for each of the first and second female threaded zones (110a, 110b): the crest (154, 254) of one of the male and female threads radially interferes with the root (251, 151) of the other of the male and female threads in a first portion of the female threaded zone (110a, 110b) and does not interfere or interferes by a smaller amount in a second portion of the female threaded zone (110a, 110b); and the second portion is located at the inner end (115a, 115b) of the female threaded zone (110a, 110b). the crest (154, 254) of one of the male and female threads radially interferes with the root (251, 151) of the other of the male and female threads in a first portion of the female threaded zone (110a, 110b) and does not interfere or interferes by a smaller amount in a second portion of the female threaded zone (110a, 110b); and the second portion is located at the inner end (115a, 115b) of the female threaded zone (110a, 110b).