BS 759-1:1984

Foreword
Committees responsible
Specification
Section one. General
1 Scope
2 Definitions
3 Applicability of other valve standards
Section two. Material requirements and limitations
4 Pressure containing components
5 Body seat faces and valve disk faces
6 Fusible plugs
Section three. Design and construction requirements
7 Locking devices
8 Scantlings
9 Castings and forgings
10 Body to bonnet/cover connection for all valves and
    fittings
11 Stems
12 Direction of operation
13 Indicators
14 Moving parts
15 Body seats
16 Body end connections
17 Cocks
18 Water level alarms
19 Water level gauges
20 Bolting for pressure containing joints
21 Pressure gauges
22 Fusible plugs
Section four. Production testing, inspection and marking
23 General
24 Safety precautions
25 Test media
26 Hydraulic test
27 Marking
Section five. Additional requirements for automatically
              controlled steam and hot water boilers
28 Automatic water level controls
29 Water level controls housed in chambers external to
    the boiler
Section six. Installation requirements
30 Boiler main stop valves
31 Boiler feedwater valves
32 Water level gauges
33 Stuffing boxes and glands
34 Fusible plugs
Appendix
A Inspection and testing facilities
Tables
1 Minimum duration of hydraulic shell test
2 Minimum duration of hydraulic seat test
Figure
1 Pressure gauge dial markings

Specifies requirements for safety fittings excluding safety valves for boiler installations where the steam pressure exceeds 1 bar gauge or, in the case of hot water boilers, the rating is 44 kW and above.

This Part of this British Standard specifies requirements for steam and water fittings excluding safety valves for boiler installations where the steam pressure exceeds 1 bar gauge or, in the case of hot water boilers, the rating is 44 kW and above. It also specifies requirements for fittings for boilers used exclusively for the following: low pressure steam heating in which the whole of the condensate is returned to the boiler on a closed circuit; hot water central heating; hot water supply. It deals with valves, boiler blowdown mountings, water level gauges, high and low water level alarms, pressure gauges, test connections and fusible plugs. Where appropriate, general recommendations relating to the installation of fittings are included for the guidance of users. Additional requirements specific to steam and hot water boilers, arranged for automatic working, are given in section 5. This Part does not cover fittings for boilers used in open vented hot water systems working at temperatures not exceeding 100 °C nor for storage water heaters of the unvented type which normally operate at temperatures not exceeding 82 °C and at pressures not exceeding 10 bar1). For such boilers within the scope of BS 779 and BS 855 the requirements are incorporated in those standards. NOTE The titles of the publications referred to in this standard are listed on the inside back cover.