* Receives a number of preliminary bid approaches
* Shares jump 30 percent
* Says no certainty acceptable offer will come
* Saipem declines comment
(Adds shares, background, analyst and Saipem comment)
By Tom Bergin and Rhys Jones
LONDON, Sept 21 (Reuters) - British oilfield services group Wellstream Holdings said it had received several bid approaches, lifting its shares 30 percent and valuing the company at over 700 million pounds ($1.09 billion).
Wellstream, which was floated on the stockmarket in 2007 by British private equity firm Candover, makes flexible pipes used by oil companies in deep water, an area set for strong growth due to major finds in Brazil and the Gulf of Mexico in recent years.
The company said on Tuesday it had "received a number of preliminary approaches regarding a possible offer for the company" but there was "no certainty that an acceptable offer will ultimately be made".
The statement follows a 5 percent rise in Wellstream shares on Monday, when the stock hit a four month high of 616 pence.
Wellstream is a frequent subject of takeover rumours, with market chatter often linking it to Europe's largest oil services company, Saipem, despite the Italian company saying last year it had no plans for acquisitions in the flexible tubes sector.
A spokeswoman for ENI, which controls Saipem, declined to comment.
Wellstream's manufacturing facility in Brazil, which is keen for locally-produced materials to be used in extracting its billions of barrels of oil finds, is seen as a key attraction for potential buyers.
National Oilwell Varco and Aker Solutions are also potential acquirers, RBC Capital markets analyst Todd Scholl said last month in a research note.
Scholl said Wellstream was at a competitive disadvantage to rivals such as France's Technip and Acergy in that it does not own a fleet of installation ships.
Wellstream shares traded up 30.4 percent at 792 pence at 0735 GMT.
Before being acquired by Candover in 2003, Wellstream was part of U.S. oil services giant Halliburton in 2003. Candover no longer retains an interest in the company, a Wellstream spokesman said. (Additional reporting by Danilo Masoni in Milan and Sarah Young in London; Editing by Mike Nesbit) ($1=.6403 Pound)