1. PURPOSE
1.1 This specification defines the minimum requirements for the quality of materials, workmanship, and inspection for structural steelwork.
2. SCOPE
2.1 This specification applies to all steelwork structures designed by Air Products Europe (AP-E).
2.2 All equipment shall be in accordance with the following: Purchase order Project specification Drawings andadata sheets This specification Other related documents listed
Note: Deviations are not permitted without the prior written approval of Air Products.
2.3 The British Standards listed in paragraph 3.2 shall apply, in addition to the requirements of this specification.
Note: For work outside the UK, all materials, workmanship, and fabrication shall be in accordance with the national and local regulations and standards of the country where final erection of steelwork is done (see Clause 8).
3. RELATED DOCUMENTS
3.1 Air Products Engineering Documents 4WEQ-6804 Painting and Corrosion Protection for Operating Temperatures up to 427oC
3.2 British Standards Institute (BSI) BS EN 287-1 Qualification test of welders-Fusion welding. Part 1: Steels BS EN 499 Welding consumables. Covered electrodes for manual metal arc welding of non alloy and fine grain steels. Classification BS EN 10025 Hot-rolled products of non-alloy structural steels and their technical delivery conditions BS 970: Part 1 Specification for wrought steels for mechanical and allied engineering purposes. General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels BS EN 1011-2 Welding. Recommendations for welding of metallic materials. Arc welding of ferritic steels BSEN 1011-3 Welding. Recommendations for welding of metallic materials. Arc welding of stainless steels BS EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles-pecifications and test methods BS EN 1600 Welding consumables. Covered electrodes for manual metal arc welding of stainless and heat resisting steels. BS EN ISO 3506-1 Mechanical properties of corrosion resistant stainless-steel fasteners. Bolts, screws and studs BS EN ISO 3506-2 Mechanical properties of corrosion-resistant stainless-steel fasteners. Nuts BS 4190 Specification for ISO metric black hexagon bolts, screws and nuts BS 4320 Specification for metal washers for general engineering purposes. Metric series BS 4395: Part 1 Specification for high strength friction grip bolts and associated nuts and washers for structural engineering. General grade BS 5950:1 Structural use of steelwork in building. Part 1: Code of practice for design—Rolled and welded sections BS 5950:2 Structural use of steelwork in building. Specification for materials, fabrication and erection. Rolled and welded sections BS 5950:5 Structural use of steelwork in building. Code of practice for design of cold formed thin gauge sections BS 5950:6 Structural use of steelwork in building. Code of practice for design of light gauge profiled steel sheeting BS EN 10204 Metallic products. Types of inspection documents BS EN 10025 Hot rolled products of structural steels. General technical delivery conditions. BS EN 10051 Specification for continuously hot-rolled uncoated plate, sheet and strip of non-alloy and alloy steels. Tolerances on dimensions and shape BS EN 12072 Welding consumables. Wire electrodes, wires and rods for arc welding of stainless and heat-resisting steels. BS EN ISO 12944-1 Paints and varnishes. Corrosion protection of steel structures by protective paint systems. General introduction BS EN ISO 15607 Specification and qualification of welding procedures for metallic materials. General rules BS EN ISO 15609-1 Specification and qualification of welding procedures for metallic materials. Welding procedure specification. Arc welding BS EN ISO 15614-1 Specification and qualification of welding procedures for metallic materials. Welding procedure test. Arc and gas welding of steels and arc welding of nickel and nickel alloys
3.3 International Organization for Standardization (ISO) ISO 3506 Corrosion-resistant stainless steel fasteners – Specifications
3.4 Standardiseringskommissionen i Sverige [Standards Institute of Sweden (SIS)] SIS 05 59 00 Swedish Standards, Pictoral Surface Preparation Standards for Painting Steel Surfaces
4. MATERIALS
4.1 All materials shall be of first-class quality, free from all defects and imperfections, of recent manufacture, unused, and of the classification and grade specified. When painting is specified, the surface condition shall comply with SIS 05 59 00 grade A, B, or C.
4.2 Sections, shapes, sizes and weights shall be as shown on the drawings unless substitutions have been approved in writing.
4.3 Unless otherwise specified on the drawings, all mild steel such as rolled sections and angles shall conform to BS EN 10025 grade S275JO or its equivalent in Annex C of BS EN 10025. The supplier shall provide a certificate of compliance for the material specified. The certificate shall be a type 2.3 in accordance with BS EN 10204.
4.4 Unless otherwise specified on the drawings, mild steel bolts and nuts shall conform to BS 4190, and washers shall conform to BS 4320. The finish of the bolts and nuts shall be either spun-galvanized or cadmium-plated. High strength friction-grip bolts, nuts, and washers shall conform to BS 4395: Part 1.
4.5 Unless otherwise specified on the drawings, stainless steel sections shall conform to BS EN 10051 grades 304 S11 or 316 S11 for structural members and pipe supports.
4.6 Stainless steel bolts shall conform to ISO 3506/BS EN ISO 3506-1, Grade A2, Class 70.
4.7 Open-type flooring shall be hot-dip galvanized. Open-type floor panels shall have all edges, including internal cut-outs, protected by banding. Unless otherwise specified, flooring shall be capable of supporting a live load of 5 kN/m2.
4.8 Galvanized parts shall conform to BS EN ISO 1461.
4.9 Welding electrodes shall conform to the following specifications: Mild steel BS 639 Stainless steel Matching filler wire/electrodes from BS EN 12072 or BS EN 1600
4.9.1 The supplier shall make test certificates available for inspection on all filler wire/electrodes used in fabrication.
5. WORKMANSHIP
5.1 Fabrication and workmanship shall conform in all respects to BS 5950: Parts 1 and 2.
5.2 Variation from specified length shall not exceed the following: Up to 10 m in length 2 mm Over 10 m in length 3 mm
Note: Equipment supports shall be within ± 10 mm of the specified location.
5.3 Welding operators shall be qualified in accordance with BS EN 287: Part 1 for the type of work being performed. Welding shall be done to approved welding procedure specifications in accordance with BS EN ISO 15607. Approval of welding procedures shall be in accordance with any of the methods in clause 5 of BS EN ISO 15607. Welder’s approval certificates, weld procedure specifications (WPSs) and weld procedure approval records (WPARs) must be available for Air Products inspection. Valid welder approvals and WPARs obtained in accordance with former British Standards are acceptable (see clause 0 in BS EN 287: Part 1 and BS EN ISO 15607) provided that these are deemed acceptable by Air Products.
5.4 All exposed welded joints shall be clean of slag and left flush and smooth. The use of any antiweld-spatter coating during construction is expressly forbidden. It is extremely difficult to remove and is incompatible with Air Products’ painting systems.
5.5 All holes shall be drilled or punched, and shall be free from burrs.
5.6 Bolts shall have unthreaded shanks long enough for the pieces held together not to bear on the threads.
5.7 Painting shall be in accordance with 4WEQ-6804.
5.8 The supplier shall not subcontract any part of the works without the prior written consent of Air Products.
5.9 When steel members are fabricated from plate material, the weld to splice each length of plate shall be staggered. The distance between any splice welds shall not be less than the total depth of the completed member.
6. REPAIR OF DAMAGED GALVANISED SURFACES
6.1 Not withstanding the requirements of BS EN ISO 1461, damaged or cut galvanised surfaces shall be repaired in accordance with the following procedure (the use of Galvafroid or similar treatments is not permitted):
6.1.1 The affected areas shall be power wire brushed or manually prepared to a minimum of SIS 05 59 00 St. 3 standard ensuring that the damaged galvanised area is feathered back to a sound edge. The prepared area shall then be painted with 75-100 m of two-pack zinc rich organic primer.
7. INSPECTION
7.1 Unless otherwise specified on the purchase order, the whole of the material is subject to inspection before despatch. All work shall be laid out, assembled, or trial-erected as required by the purchase order to facilitate inspection. The supplier shall provide measuring devices, a free area for laying out sections, and labour to assist with handling members.
7.2 The Air Products Inspection Department might be required to witness the loading of the steel work on to the transport, and to check the supplier’s packing of the works. The supplier will be notified whether or not the inspection is required.
7.3 The Air Products Expediting Department must be given a minimum of seven days notice prior to availability of inspection.
8. PACKING AND DESPATCH
8.1 Each item shall be distinctly marked in a standard position to facilitate its identification at the delivery point. All marks shall be applied with weld metal.
8.2 Small items shall be bagged in securely tied bags. All loose items shall be wired together.
8.3 Panels shall be despatched in bundles, with a timber frame around the perimeter of each bundle, and banded with metal strips 25 mm wide and 1 mm thick. Other effective methods of packing may be used, subject to the prior approval of Air Products.
8.4 Bolts, nuts, and washers shall be supplied either in a double fabric bag or in one or more fabric bags within a box. 10% of extra bolts, nuts, and washers (excluding anchor bolts) shall be supplied. All bags shall be securely tied and tagged to show their contents and the Air Products purchase order number.
8.5 When a number of pieces (marked in accordance with paragraph 8.1) are packed in bundles or crates, each package shall be given an identifying mark or number. Packages with weight exceeding three tonnes shall be marked with their total weights.
8.6 The supplier shall provide a detailed list of all items, quoting their marks and weights, and a detailed list of bolts, showing the location of each bolt and their diameters and lengths. Apart from their individual marks, items that are packed in bundles or boxes shall also have shown against them the identifying number or mark of the package to which they belong (see paragraph 8.5). The total weight of each package shall be indicated on the lists. Two copies of the lists shall be enclosed with the consignment, and two additional copies shall be forwarded to Air Products’ chief expeditor at Hersham.
8.7 When materials destined for overseas sites are being delivered by the supplier FOB UK port, the supplier shall obtain shipping instructions from the Air Products shipping officer.
9. ALTERNATIVES
9.1 For structural steelwork destined for erection outside the United Kingdom, the applicable codes and standards of the country of final erection of the steelwork shall be substituted for those listed in Section 3.
9.2 All stainless steel and mild steel destined for erection outside the European community shall have properties and qualities that are at least equal to those of the specified steel.
9.3 Mild steel destined for erection inside the European Community shall be an equivalent grade taken from Annex C of BS EN 10025. In all cases, steel shall be suitable for use in, and in accordance with, the national standards of the country of final erection.
9.4 No substitution of materials shall be made without the prior consent of Air Products.
1O. DRAWINGS
10.1 Electronic renditions in either .tif or .pdf format of all fabrication details shall be sent to Air Products for review prior to fabrication. The supplier shall also supply Air Products with one reproducible copy of all drawings before the despatch of materials.
10.2 The supplier shall complete a “supplier drawing register,” listing all detail drawings with their numbers and titles, and shall forward it to Air Products by the date specified on the purchase order.