The part of the sentence "when necessary for" is correct and usable in written English.
It can be used when something needs to be done because of a current requirement or situation. Example sentence: Employees must submit their work assignments by the end of the day when necessary for their projects to stay on schedule.
Ministers have to obey... and must sacrifice themselves when necessary for the greater good.
Mr. Sowore is happy to publish them, shielding the reporters' names when necessary for their protection.
A vibrant economy needs a flexible and adaptable workforce, able to move as and when necessary for their careers.
This is, after all, a system that Mr. Milosevic, a master technician, has manipulated when necessary for the last 12 years.
The report said public officials should consider the vulnerability of coastal areas and take action when necessary, for example, by limiting development in vulnerable areas.
That "natsch", a spindly thistle, is used by Israeli lawyers to mean waste ground – "more easily requisitioned when necessary for Israeli purposes," Macfarlane notes.
That doesn't mean that these Texans don't have long memories, which are used when necessary for social one-upsmanship and emotional blackmail.
"Control and monitoring of access to the data will be taken very seriously so we can assure patients that their information is only viewed when necessary for medical care.
He flouts some rules here — for example, publishing a perfume formula (33 materials, including grapefruit) — though he goes off the record when necessary (for example, discussing politics with Parker, who is, she says, "soooo intimidated!" by him).
Collaboration between regular and special education teachers, a classroom aide to assist differently able children, special adapted equipment when necessary for the child's maximum participation in this "mainstreamed" environment.
She spoke of her older sister as the leader of their doubles team, a type-A personality willing to cede that role when necessary, for "the best chemistry," Serena said.
