user: Article: The Unite, GMB and RMT unions have raised concerns about the Bilfinger Salamis decision.
The fears are about future plans for pay, jobs and working conditions.
Bilfinger Salamis said leaving the Offshore Contractors Association allowed it closer dialogue with staff.
The OCA collectively agrees pay and conditions with workers on behalf of its member companies.
The Unite, GMB and RMT unions said Bilfinger Salamis's decision to leave had left its members effectively without trade union representation.
They have written to the company asking for voluntary recognition of their rights to represent workers, and that they would seek statutory recognition if necessary.
A joint union spokesman said: "Bilfinger's actions are causing massive concern among workers, who now have justified concerns about their future with the company.
"Trade unions are the way that workers come together to support each other, and it is completely unacceptable for Bilfinger Salamis offshore workers to be left without trade union recognition for collective bargaining."
A spokesman from Bilfinger Salamis said: "Since announcing our withdrawal from the OCA in December 2015, we have been in continual dialogue with the unions and will remain so through our employee representative committee.
"Both Unite and GMB have seats on this committee alongside the offshore workers that have volunteered to take part, with more joining since it was founded in May.
"We are proud of this initiative which enables closer engagement with both our workforce and the unions than was possible within the OCA."
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Summarize: Unions claim workers at an Aberdeen-based oil services firm are without proper representation after it withdrew from a collective bargaining agreement over pay and conditions.


Problem: Ofcom found "serious weaknesses" in the Hull-based firm's emergency call service which meant people in the area could not make calls to 999 or 112.
The regulator found it had broken rules to ensure people can contact emergency services at all times.
KCOM operates the main telephone and broadband network in Hull.
It is the only UK city not served by BT's Openreach, which controls the telecoms network.
Read more about this and other stories from across Yorkshire
Ofcom said KCOM notified the regulator on 28 December 2015 that its emergency call service for the Hull area had failed for around four hours.
It said the failure was because of flooding at one of the BT's telephone exchanges in York in the wake of Storm Eva.
However, Ofcom found that all emergency calls from customers in that area relied on the flooded telephone exchange in York.
Under Ofcom rules, the telephone and broadband operator should have been able to automatically divert emergency calls via back-up routes.
The investigation found that although the firm did have back-up routes in place, these also relied on the flooded telephone exchange in York.
Ofcom said KCOM created an alternative route to carry emergency calls that bypassed the flooded telephone exchange in York within two hours of identifying the problem.
The regulator said it expected telephone companies' services to be resilient enough "to the greatest extent possible" to connect emergency calls at all times, even in challenging circumstances.
What was that article about?

A: Communications provider KCOM has been fined £900,000 after flooding caused by Storm Eva led to the failure of 74 emergency calls.


It all started when the head of Israel's association of tour operators posted a photo of the bill, suggesting the visitors may have been "suckered".
But the restaurant's owners contest this, and give a different version of how the meal unfolded.
They say the group had a gourmet meal and the venue was closed to host them.
The bill, from the popular Abu Ghosh restaurant on the outskirts of West Jerusalem, allegedly included 5,900 shekels in alcohol, 4,000 shekels for the use of the private room and 3,150 shekels for the main course.
On top of what was consumed by the group, there was a service charge of 1,500 shekels.
In a post on Facebook (in Hebrew) with a picture of the bill, Yossi Fatael, chairman of the Israel Incoming Tour Operators Association, said the group's tourist agent confirmed they had paid the bill.
"There may be a billion Chinese, but they may not all be suckers," he said.
"This is how we are destroying our own budding potential of the Chinese market in Israel."
But Jawdat Ibrahim, one of Abu Ghosh's owners, disputed this.
He said, also on Facebook (in Hebrew), the group had a gourmet meal that lasted for eight hours, with special desserts, specially ordered alcoholic drinks and artists - and that the restaurant was closed to the public to host them.
He also said the eight had insisted on paying the service charge. The post had pictures of what he said was the specially produced decoration to host the group.
The Chinese visitors have not been identified.
Some 6,900 Chinese tourists visited Israel in July, according to the Central Bureau of Statistics.  In the same month, there were 57,000 tourists from the US and 31,600 from France.

Sum: A bill of 16,500 shekels ($4,393; Â£3,285) handed to a group of eight Chinese tourists in a restaurant near Jerusalem has sparked an online row.


Q: The move followed calls for further consideration of the regulations after women carrying babies with fatal foetal abnormalities told their stories.
Foetal abnormality is not a reason for abortion under Northern Ireland law.
Health Minister Edwin Poots has said he would meet the Public Prosecution Service over potential prosecution of staff involved in an abortion.
In a statement on Wednesday, a Department of Health spokesperson said consultation on the draft guidelines, issued in March, had now closed.
"A number of submissions highlighted the issue of lethal foetal abnormality and incompatibility with life," the statement said.
"Full consideration is currently been given to all the consultation submissions and the minister intends to bring a final version to the executive for its consideration at an early stage, ideally within a number of weeks".
Meanwhile, a retired senior obstetrician has told the BBC that the draft abortion guidelines have caused a "mood of fear" among medical staff since their publication in March.
Prof Jim Dornan, who was involved in drawing up the previous guidelines, said high-profile foetal abnormality cases were emerging now because of the new measures included in the six-month old draft guidelines.
He said those measures included a warning that staff could face ten years in jail if they failed to report their suspicions of unlawful terminations to police.
Prof Dornan has welcomed the health minister's decision to meet the Public Prosecution Service, to clarify the legal implications for health care staff.
Last week, the BBC's Nolan Show highlighted the cases of two women who were refused terminations in Northern Ireland.
Sarah Ewart travelled to England for an abortion because her baby was diagnosed with anencephaly, a severe brain abnormality.
She said the baby had no skull formed and it was brain dead.
Another woman, Laura, who is 22 weeks pregnant with twins who are suffering from the same condition, appealed to Mr Poots to allow her to have an abortion in Northern Ireland.
Justice Minister David Ford has previously said he was committed to bringing a paper to the Northern Ireland Executive looking at issues around the termination of pregnancy.
The justice minister said the women's circumstances had highlighted whether adjustments were needed in the current legislation.

A: Revised guidelines on abortion in Northern Ireland are to be brought before the Stormont Executive in weeks.


Problem: Peter Hedley, 49, from Bedlington, Northumberland, was found dead in undergrowth at Newburn Riverside Park in November.
Newcastle Crown Court heard Clare Humble, 50, also from Bedlington, beat and stabbed him and buried the body with the help of a former boyfriend.
She was told she must serve a minimum of 20 years.
The jury was told Humble persuaded her former partner Lee Nicholson, 39, to help dispose of Mr Hedley's body.
Nicholson, from Newcastle, admitted perverting the course of justice and will be sentenced later.
Humble told police that she and Mr Hedley had fought at the house they shared, but denied murder.
Mr Justice Laing said she had taken advantage of a "trusting man."
What was that article about?

A:

assistant: A woman has been jailed for life for the murder of her partner, whose body was found in a Newcastle park.