Scope
- Covers pipe fittings, valves, specials, and other components associated with pipe systems.
- Applies to both above-ground and below-ground pipework.
- Complements Class I (Pipes).
- Excludes:
- Pipe lengths themselves → Class I
- Pipe supports, hangers, and brackets → Class K
- Chambers, manholes → Class E (Earthworks) or Class G (Concrete Ancillaries)
1. General Principles
- Ancillaries = components required to complete the pipeline other than straight pipe lengths.
- Always measured by number (No.), unless otherwise specified.
- Rate includes:
- Supply, delivery, unloading.
- Fixing to pipes.
- Jointing, welding, bolting, or mechanical fixing.
- Testing and commissioning (where applicable).
2. Sub-classifications under Class J
J1 – Bends, Junctions, Specials
- Bends (11.25°, 22.5°, 45°, 90°).
- Tees, Y-junctions, Crosses.
- Reducers, increasers.
- Special fabricated sections (spools).
- Measured by number (No.).
- Must state material, diameter, angle, pressure class.
J2 – Valves
- Gate valves, sluice valves, butterfly valves, non-return valves, air valves, scour valves, ball valves.
- Must state:
- Type (e.g., gate, butterfly).
- Diameter (ID).
- Pressure class (PN rating).
- Operation (manual, geared, electric, pneumatic).
- Location (in chamber, above ground).
- Measured by number (No.).
J3 – Hydrants, Standpipes, Taps
- Fire hydrants (single/double outlet).
- Washout hydrants, standposts, water draw-off points.
- Taps, bibcocks for service connections.
- Measured by number (No.).
J4 – Chambers for Valves/Hydrants
- Chambers (valve chambers, hydrant chambers, meter chambers) often measured separately in Class E (earthworks) or Class G (concrete).
- But ancillaries (covers, frames, mechanical housing) may be included here.
J5 – Couplings, Flanges, Joints
- Flexible couplings, flange adaptors, mechanical joints, expansion joints, puddle flanges.
- Must specify: material, diameter, rating.
- Measured by number (No.).
J6 – Meters and Instruments
- Flow meters, pressure gauges, control instruments, regulators.
- Must specify:
- Type (electromagnetic, ultrasonic, turbine, etc.).
- Range/size.
- Measured by number (No.).
J7 – Miscellaneous Ancillaries
- Vents, strainers, filters, arrestors, inspection eyes, stop ends.
- Measured by number (No.).
3. Measurement Rules
- Unit of measurement = number (No.).
- Description must include:
- Type (bend, valve, hydrant, etc.).
- Material (DI, CI, steel, plastic, GRP, brass).
- Size (diameter, PN pressure class).
- Location (buried, above ground, chamber).
- Method of operation (for valves, e.g., handwheel, geared, actuated).
4. Information to State in BOQ Description
Each ancillary description must specify:
- Material & standard (DI to ISO 2531, CI to BS EN, steel to API, etc.).
- Diameter/nominal bore.
- Pressure class/PN rating.
- Joint type (flanged, welded, push-fit, mechanical).
- Coatings/lining (bitumen, epoxy, cement).
- Testing requirements.
5. Example BOQ Items (Class J)
- Supply and install ductile iron bend, 45°, 200 mm dia, PN16, with push-fit socket joints, per number.
- Supply and install sluice valve, 250 mm dia, PN16, manual handwheel operated, complete with cast iron chamber cover, per number.
- Supply and install double air release valve, 80 mm dia, flanged, with epoxy coating, per number.
- Supply and install hydrant, single outlet, 100 mm dia, with valve chamber and cover, per number.
- Supply and install mechanical flexible coupling, 300 mm dia, epoxy coated, per number.
- Supply and install electromagnetic flow meter, 200 mm dia, with flanged ends and transmitter, per number.
✅ Summary of Class J: Pipework — Ancillaries
- Covers fittings, valves, specials, hydrants, meters, couplings.
- Measured by number (No.).
- Must state type, material, size, pressure class, jointing, location.
- Complements Class I (Pipes).
- Supports/anchors go to Class K.
