Pembrokeshire residents living near the South Hook LNG site have been assured that noise coming from recently berthed LNG super tanker, the Tembek is a temporary problem.
The Tembek arrived in Milford Haven on Friday afternoon, carrying the first shipment of LNG into Pembrokeshire.
Since then a noise, described as sounding like a droning helicopter, has emanated from the vessel.
Pembrokeshire County Council confirmed that they have received two complaints about the noise. Residents of Haven Drive in Gelliswick are said to be particularly affected.
The sound is caused by the reliquefaction plant compressors on the Tembek as she is waiting to offload her cargo of liqified natural gas.
A spokesman from South Hook LNG said: "South Hook would like to apologise for any inconvenience caused by the sound local residents may have heard coming from the LNG Carrier the Tembek since its berthing on Friday 20th March.
"This is due only to this particular phase of the initial commissioning as she is keeping her cargo in a liquefied state.
"In the meantime, the Master of the Tembek will do everything he can to minimise the impact of the sound on local residents."
If you have any concerns you are asked to contact South Hook on 01437 782000 or the PR Manager on 07778 807820.
Have you been affected by the noise? Leave your comments below.