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A
VK
UK,
8
Rushmills,
Northampton,
England,
UK,
NN4
7YB,
T
:
+
44
(0)
1604
601188.
[email protected] www
.avkuk.co.uk
COPYRIGHT©AVK GROUP A/S 2018
The designs, materials and specifications shown are subject to change without notice due to our continuing programme of product development.
O&M 090618
OPERATION AND MAINTENANCE INSTRUCTIONS
AVK FABRICATED COUPLINGS FOR WATER AND WASTEWATER
Series 258/30 and 259/30
2. HEALTH AND SAFETY PRECAUTIONS
Make sure all relevant Health and Safety issues and regulations are adhered to prior to and during installation or maintenance
work carried out on this product. It is the end user’s responsibility to ensure that safe working practices are followed at all times.
Whenever AVK’s products are installed, operated or maintained the inherent dangers of pressurised liquids and gasses must be
addressed. Before work on a valve or other piping component is undertaken, that may involve the release of internal pressure, the
valve or line must be fully isolated, depressurised and drained prior to commencing the work. FAILURE TO COMPLY WITH THIS
MAY RESULT IN SEVERE INJURY OR DEATH.
All workers handling the product must be aware of the weight of the components or assemblies to be handled and manipulated
during installation and maintenance.
It is essential that staff undertaking these operations are adequately trained and it is the responsibility of the end user that only
trained and competent staff undertake these duties.
This manual has been designed to assist, but it cannot replace quality training in the workplace. However, the AVK technical staff
is always available and ready to answer questions relating to specific problems that may not be covered by this manual.
AVK’s products are designed to be fit for purpose and to a high reliability standard. This provides a safe, low risk product when
used correctly for the purpose for which it was designed. However, this assumes that the equipment is used and maintained in
accordance with this manual, and the user is advised to study it and to make it available to all staff that may need to refer to it.
AVK cannot be held responsible for incidents arising from incorrect installation, operation or maintenance. The responsibility for
this rests wholly with the end user.
3. INSTALLATION
Checks to be made prior to installation:
1. Confirm the actual outside Diameter of pipe ends to which the fitting is to be assembled.
2. Check that the pipe ends are smooth (free from dents, weld seams and score marks etc....)
3. Ensure that the sealing areas on the pipe ends are cleaned by wire brushing removing all scale, rust, protective coating and
general debris etc...
4. Confirm that fitting to be assembled is fit for purpose with regard to type, pressure rating, sealing range, flange ratings and
medium conveyed etc...
5. Ensure that working area is sufficient to allow comfortable access and installation.
6. Check that all necessary tooling is readily available, including torque wrench, box spanners, WRc approved lubricant etc...
7. Check that fitting has not been damaged during transit / storage.
Installation:
1. Position pipe ends to be coupled, checking the level and concentricity to each other, adjust trench bed or pipe supports as
required. In the event of a spool piece being assembled it is important that independent permanent support is provided to
ensure that no external forces are imposed onto the coupling assemblies.
NOTE: In the event of backfilling the trench, adequate permanent support must be provided to the spool piece in-line with
standard working practices, taking into account nature of subsoil etc...
2. To assist centering of coupling over pipe gap, mark pipe an equal distance from each end, approx. half the fitting length plus
25mm.
3. Dismantle the fitting, ensuring that all the components are kept clean throughout installation.
4. Slide gland ring over each pipe end, with seal housing facing pipe end.
5. Lubricate sealing area on each pipe end thoroughly with an approved lubricant, then slide the sealing ring over each pipe end,
ensuring that the thick end is housed in the gland ring.
6. Position centre sleeve over pipe ends, adjusting free pipe to provide correct setting gap as listed below :
Series 258 Straight Coupling
DN 350 - DN 900 SETTING GAP = 25mm
DN1000 - DN1630 SETTING GAP = 36mm
Series 259 Stepped Coupling
DN 350 - DN 900 SETTING GAP = 25mm
DN1000 - DN1200 SETTING GAP = 36mm
NOTE: AVK couplings must be restrained properly before any end loads are applied
either longitudinally or laterally. Failure to do so will result in “pipe pull-out”.
