Section one: Contracting authority
one.1) Name and addresses
The Coal Authority
200 Lichfield Lane
MANSFIELD
NG184RG
Contact
Rebecca Vines
Telephone
+44 1623637351
Country
United Kingdom
NUTS code
UKF15 - North Nottinghamshire
Internet address(es)
Main address
https://www.gov.uk/government/organisations/the-coal-authority
one.3) Communication
The procurement documents are available for unrestricted and full direct access, free of charge, at
https://inbye.coal.gov.uk/s2c/
Additional information can be obtained from the above-mentioned address
Tenders or requests to participate must be submitted electronically via
https://inbye.coal.gov.uk/s2c/
one.4) Type of the contracting authority
Body governed by public law
one.5) Main activity
Public order and safety
Section two: Object
two.1) Scope of the procurement
two.1.1) Title
Dawdon Short Sea Outfall Repair Works
Reference number
CA18/2/1/27
two.1.2) Main CPV code
- 45231100 - General construction work for pipelines
two.1.3) Type of contract
Works
two.1.4) Short description
The Coal Authority is looking for a specialist contractor to undertake the refurbishment of existing sea outfall structure at Dawdon Mine Water Treatment Scheme, located approximately 1km south of Dawdon, County Durham. Please see II.2.4 for further details and full description of the works.
The works will be undertaken in accordance with the NEC4 Engineering and Construction Contract - Option B Priced Contract with Bill of Quantities and further details can be found at www.neccontract.com.
For further details and full description of the works, please also visit the Contracts Finder Notice published for this opportunity. Here you will find the Scope and instructions on how to register for the event and gain access to the full tender documentation, available within the link below.
https://www.gov.uk/contracts-finder
two.1.6) Information about lots
This contract is divided into lots: No
two.2) Description
two.2.2) Additional CPV code(s)
- 44161400 - Underwater pipeline
- 44161410 - Subsea pipelines
- 44162000 - Piping
two.2.3) Place of performance
NUTS codes
- UKC - North East (England)
Main site or place of performance
Dawdon SSO is located in County Durham approximately 1km south of Dawdon. The nearest address and grid reference is:
Noses Point car park
East Cliff Road
Seaham
Post Code SR7 7PS
54.82365, -1.32215
two.2.4) Description of the procurement
The Dawdon short sea outfall consists of two parallel 200mm pipes with a gravity flow approximately 350m to the discharge point 140m metres from the shore. The pipes were installed through directional drilling and emerge from under the sea bed at the discharge point. Each pipe comes to a T piece with duck bill diffuser elements fitted to each end of the T section.
The base of the discharge arrangement was not sufficiently supported and this has allowed the pipework to rotate impacting discharge flows.
This needs to be repaired and returned to the correct position with improvements to the support of the diffusers from a pre cast concrete base. The diffusers also had a protective structure that has been dislodged and this needs to be replaced by a new protective sleeve and cap. The protective sleeve can either be a pre-cast concrete pipe or an HDPE pipe section which will be capped by a pre-cast concrete or GRP lid.
The replacement duckbills will have to be fitted after the sleeve is placed. Alternatively, arch shaped cut-outs could be implemented, to fit over the duckbills. The "duckbill" check valves will protrude slightly through holes/ windows prepared for purpose and will discharge normally.
Construction
Due to operational requirements shut down of the pipelines must be well planned and durations kept to a minimum. Based on our feasibility studies the shutdowns are estimated to be no longer than 3 hours per pipeline. All the rehabilitation operations that require no flow through the pipe must be programmed to take place at the same time so that only one shut-down period is required.
The following tasks will need to be completed under shutdown:
• Disconnection of the flange adapter and replace.
• Align the diffuser to vertical and temporarily secure.
• Remove the diffuser Tideflex Check Valves.
• Drop the protection sleeve into position.
• Replacing the diffuser Tideflex Check Valves
Divers to conduct the following site preparation activities.
• Clearing loose rubble around the flange adapter and concrete base footprint.
• Rock drilling may be required to level concrete base footprint.
After Pipeline Shutdown
• Replace/ rehabilitate and install:
• Blank flange o Sacrificial break away spool piece (optional)
• Flange Adapter - and right the diffuser to vertical alignment.
• Remove the diffuser Tideflex Check Valves.
• Place and secure precast concrete base
• Drop the protection sleeve into position.
• Replace the diffuser Tideflex Check Valves
After Resume Pipeline Flow
• Grout fill around flange adapter.
• Place and secure protective sleeve cap.
• A marker buoy with independent anchorage is also to be installed.
Evidence of quality control measures and that the installation is as per design are required.
two.2.5) Award criteria
Price is not the only award criterion and all criteria are stated only in the procurement documents
two.2.7) Duration of the contract, framework agreement or dynamic purchasing system
Duration in months
3
This contract is subject to renewal
No
two.2.10) Information about variants
Variants will be accepted: No
two.2.11) Information about options
Options: No
Section three. Legal, economic, financial and technical information
three.1) Conditions for participation
three.1.2) Economic and financial standing
Selection criteria as stated in the procurement documents
three.1.3) Technical and professional ability
Selection criteria as stated in the procurement documents
Section four. Procedure
four.1) Description
four.1.1) Type of procedure
Open procedure
four.1.8) Information about the Government Procurement Agreement (GPA)
The procurement is covered by the Government Procurement Agreement: No
four.2) Administrative information
four.2.1) Previous publication concerning this procedure
Notice number: 2022/S 000-001876
four.2.2) Time limit for receipt of tenders or requests to participate
Date
6 May 2022
Local time
4:00pm
four.2.4) Languages in which tenders or requests to participate may be submitted
English
four.2.6) Minimum time frame during which the tenderer must maintain the tender
Duration in months: 6 (from the date stated for receipt of tender)
four.2.7) Conditions for opening of tenders
Date
6 May 2022
Local time
4:05pm
Section six. Complementary information
six.1) Information about recurrence
This is a recurrent procurement: No
six.2) Information about electronic workflows
Electronic ordering will be used
Electronic invoicing will be accepted
Electronic payment will be used
six.4) Procedures for review
six.4.1) Review body
The Coal Authority
200 Lichfield Lane Mansfield
Mnasfield
NG184RG
Country
United Kingdom
Internet address
https://www.gov.uk/government/organisations/the-coal-authority