A native of Pamplona, Navarre, Tirapu began his career in his hometown at CD Oberena, from where he was signed by CA Osasuna in 1970, aged 19. At that time the latter club competed in Tercera División, but it was promoted at the end of his second season; by now a regular at the El Sadar Stadium, he made his debut in the professional leagues on 3 September 1972 in a 0–1 home defeat to Racing de Santander, under manager Moruca. He scored his first goal a few weeks later against Pontevedra CF (2–1 away win), as his team went on to be relegated from Segunda División in 1974.
However, rather than moving down a level, Tirapu moved up when he joined La Liga side Valencia CF that summer. His first game in the competition took place on 7 September 1974, in a 1–2 home loss to Real Madrid.[1] In his first year, he made a major contribution in nullifying the attacking threat of Johan Cruijff as Los Che battled to a 1–0 victory over FC Barcelona.[2] After playing regularly for three seasons at the Mestalla Stadium, during which the side did not challenge for major honours, he transferred to Athletic Bilbao in 1977 for a fee of around 23 million pesetas.[3]
In 1983, Tirapu followed a route taken by several players when he moved back to Osasuna (who by now had returned to the top flight).[8] Two years later, he finished his career at the age of 34.
Tirapu's younger brother, Mariano, was also a footballer. A goalkeeper, he also played for Osasuna among other clubs.[9] Both were related to Ainhoa Tirapu, goalkeeper for Athletic Bilbao's women's team and the daughter of their cousin.[10]
Tirapu died on 28 July 2018 at the age of 66, in his hometown of Pamplona.[11]