A Tory MP has demanded to see safety reports for a barge that the government plans to use to house asylum seekers.

The Bibby Stockholm – which will accommodate 500 people waiting for decisions on their applications – departed from Cornwall on Monday to head to its new dock at Portland Port in Dorset.

But Chris Loder, who represents West Dorset, claimed the figure was double the capacity the barge had been designed to hold.

Mr Loder has called on the home secretary to “stop” the vessel or provide the assessments that show it is “safe to cope with double the weight that it was designed to bear”.

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The government has been seeking out new accommodation for asylum seekers, including those who cross the Channel in small boats, claiming the hotel bill to house them has hit £6m a day.

As well as the barge, it has taken over former military bases, and reports have even suggested large marquees could be used.

But ministers have faced a backlash from local residents, councils and MPs if their areas have been chosen for the new sites.

Previously Richard Drax MP, a Conservative who represents South Dorset (including Portland), threatened the government with legal action over the barge.

Mr Loder, who has also spoken out against the Bibby Stockholm coming to his county, has now put pen to paper, writing to Home Secretary Suella Braverman and transport minister Baroness Vere with his concerns over the safety of the barge.

“For months, I have been asking for sight of the safety risk assessments that should have been done to allow the Bibby Stockholm to be used in Portland Harbour with 500 people on board whilst it was designed for 250,” he wrote.

“The Bibby Stockholm has now left Falmouth Dock. But visibility or assurances that adequate safety risk assessments have been completed have not been received.”

The MP also claimed that following a call with the Maritime and Coastguard Agency, it was “clear they have also not undertaken that work, which we would typically expect them to do for a flagged vessel on water – which is what the Bibby Stockholm is”.

Mr Loder added: “I am writing to you this evening to ask that you either stop the Bibby Stockholm or that you provide the necessary safety risk assessments that confirm this vessel is safe to cope with double the weight that it was designed to bear.”

The move of the three-storey vessel is already a month behind schedule, after Ms Braverman told MPs it would be in Portland within a fortnight on 5 June.

The 222-bedroom vessel contains “basic” accommodation, with healthcare provision, catering facilities and 24/7 security, at a reported cost of £20,000 a day, the Home Office said back in May.

Dorset Council has been given £2m in a funding package to meet the cost of providing services to residents.

In a statement in response to Mr Loder’s concerns, the Home Office said: “We can confirm that Bibby Stockholm is now on its way to Portland Port.

“Using vessels as alternative accommodation, like our European neighbours are already doing, will be better value for British taxpayers and more manageable for communities than costly hotels.

“We continue to work extremely closely with local councils and key partners to prepare for arrival of asylum seekers later this month and minimise disruption for local residents including through substantial financial support.”