Appendix F Pipework fabrication methods
with 26.4.2 and Figure 6
For terminal ends the dimensions for method 2 are to be used.
NOTE This procedure is commonly known as the “thin skin technique”
whereby a sub-assembly is generally produced from pre-formed thin shells which are integrally laminated together to produce the final sub-assembly.
Erection/assembly of the
sub-assemblies to form pipework systems. Flanged joints and butt joints to be made where
appropriate.
2 Minimum dimensions for but jointed pipes and fittings.
Manufacture of pipe lengths and pipe fittings (including flanges) which have ends suitable for butt jointing after preparation on site to the requirements of 26.4.1 and Figure 11 or the requirements of 26.4.2 and Figure 6.
The minimum dimensions of the pipe fittings are given by the equation in Table 7 using the values in Table 8.
Erection/assembly of the pipe lengths and pipe fittings to form pipework systems. Flanged joints and butt joints to be made where required.
3 Minimum dimensions for flanged pipes and fittings.
Manufacture of pipe lengths and pipe fittings complete with flanged ends.
The minimum dimensions of the pipe fittings are given by the equations in Table 7 using the values in Table 8.
Erection/assembly of the pipe lengths and pipe fittings to form pipework systems. Flanged joints to be made where required.
B S 6 46 4:1 98
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4
© BSI 03-1999 Figure 2 — Relationship between thickness and glass content for laminates with resin of relative density, (+), 1.1 to 1.3
Figure 3 — Relationship of unit modulus to winding angle
Figure 4 — Factor related to temperature
Licensed copy: Mr. National University Singapore, National University of Singapore, Version correct as of 19/11/2012 08:31, (c) The British Standards Institution 2012
Figure 5 — Factor related to cyclic loading
Figure 6 — Butt joint build-up for lined pipe
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Figure 7 — Pipework shapes for fabrication methods 1 and 2 (see Appendix F)
Figure 8 — Flanged pipe fittings for method 3 (see Appendix F)
Licensed copy: Mr. National University Singapore, National University of Singapore, Version correct as of 19/11/2012 08:31, (c) The British Standards Institution 2012
Figure 9 — Typical stub flanges (type A)
Figure 10 — Typical full faced flanges (types B and C)
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NOTE Amount of overlay, t2 ’ is a laminate having 1.2 times the UTUS of pipe wall liminate, t1. All dimensions in millimetres.
Figure 11 — Butt joint build-up for unlined pipe
Figure 12 — Test piece for the determination of shear strength of bond between thermoplastics lining and laminate
Figure 13 — Test piece for the determination of lap shear strength of laminate
Licensed copy: Mr. National University Singapore, National University of Singapore, Version correct as of 19/11/2012 08:31, (c) The British Standards Institution 2012
Figure 14 — Test for determination of peel strength of bond between thermoplastics liner and laminate
Figure 15 — Test piece for tensile strength of thermoplastics sheet and welds
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Figure 16 — Typical examples of laminate construction
Figure 17 — Biaxial failure envelope
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BS 476, Fire tests on building materials and structures.
BS 476-7, Surface spread of flame tests for materials.
BS 1560, Steel pipe flanges and flanged fittings (nominal size 1/2 in to 24 in) for the petroleum industry.
BS 1560-2, Metric dimensions.
BS 1610, Method for the load verification of testing machines.
BS 1755, Glossary of terms used in the plastics industry.
BS 1755-1, Polymerization and plastics technology.
BS 2044, Laboratory tests for resistivity of conducting and antistatic rubbers.
BS 2494, Materials for elastomeric joint rings for pipework and pipelines.
BS 2782, Methods of testing plastics.
BS 2782-Method 121A, Determination of temperature of deflection under a bending stress of 1.8 MPa of plastics and ebonite.
BS 2782-Method 320A to F, Determination of tensile strength, elongation and elastic modulus.
BS 2782-Method 345A, Determination of compressive properties by deformation at constant rate.
BS 2782-Method 430B, Determination of water absorption at 23 °C with allowance for water-soluble matter.
BS 2782-Method 1001, Measurement of hardness by means of a Barcol impressor.
BS 2782-Method 1002, Determination of loss on ignition.
BS 2782-Method 1003, Determination of tensile properties.
BS 3293, Carbon steel pipe flanges (over 24 in nominal size) for the petroleum industry.
BS 3396, Woven glass fibre fabrics for plastics reinforcement.
BS 3496, E glass fibre chopped strand mat for the reinforcement of polyester resin systems.
BS 3505, Unplasticized PVC pipe for cold water services.
BS 3506, Unplasticized PVC pipe for industrial purposes.
BS 3532, Unsaturated polyester resin systems for low pressure fibre reinforced plastics.
BS 3534, Epoxide resin systems for glass fibre reinforced plastics.
BS 3691, Glass fibre rovings for the reinforcement of polyester and of epoxide resin systems.
BS 3749, Woven roving fabrics of E glass fibre for the reinforcement of polyester resin.
BS 3757, Specification for rigid PVC sheet.
BS 3846, Methods for the calibration and grading of extensometers for testing of metals.
BS 4346, Joints and fittings for use with unplasticized PVC pressure pipes.
BS 4346-1, Injection moulded unplasticized PVC fittings for solvent welding for use with pressure pipes, including potable water supply.
BS 4346-3, Specification for solvent cement.
BS 4504, Flanges and bolting for pipes, valves and fittings. Metric series.
BS 4504-1, Ferrous.
BS 5350, Methods of test for adhesives.
BS 5350-C5, Determination of bond strength in longitudinal shear.
BS 5350-C6, Determination of bond strength in direct tension in sandwich panels.
BS 5480, Specification for glass reinforced plastics (GRP) pipes and fittings for use for water supply or sewerage5).
BS 5955, Code of practice for plastics pipework (thermoplastics materials).
BS 5955-7, Recommended methods for thermal fusion jointing.
5) Referred to in the foreword only.
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