Ball joint compensator for district heating system
1 Scope
This standard specifies the terms and definitions, classification and designation, general requirements, inspection requirements, inspection methods, inspection rules, drying and painting, as well as marking, packaging, transportation and storage of the ball joint compensator for district heating system.
This standard is applicable to the manufacture and inspection of ball joint compensators with design pressure not greater than 2.5 MPa, design temperature of hot water medium not greater than 200°C, design temperature of steam medium not greater than 350°C and nominal diameter of piping not greater than 1600 mm, which are used to absorb angular movement in any plane.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 150.2 Pressure vessels - Part 2: Materials
GB/T 150.3 Pressure vessels - Part 3: Design
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 699 Quality carbon structure steels
GB/T 711 Hot-rolled quality carbon structural steel plates sheets and strips
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 985.1 Recommended joint preparation for gas welding manual metal arc welding gas-shield arc welding and beam welding
GB/T 985.2 Recommended joint preparation for submerged arc welding
GB/T 1348 Spheroidal graphite iron castings
GB/T 1804-2000 General tolerances－Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3077 Alloy structural steels
GB/T 3274 Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural steels
GB/T 3420 Gray iron castings for pipe fittings
GB/T 8163 Seamless steel pipes for liquid service
GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1:Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous
GB/T 9119 Slip-on-welding plate steel pipe flanges
GB/T 9124 Specification for steel pipe flanges
GB/T 9125 Fasteners for pipe flange joints
GB/T 11379 Metallic coatings - Electroplated coatings of chromium for engineering purposes
GB/T 30583 Specification for post weld heat treatment of pressure equipment
JB/T 4711 Coating and packing for pressure vessels transport
JB/T 6617 Specification of flexible graphite ring
JB/T 7370 Flexible graphite braided packing
JB/T 7758.2 Specifications of flexible graphite sheets
NB/T 47013.2-2015 Nondestructive testing of pressure equipments - Part 2: Radiographic testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47014 Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ball joint compensator
device that absorbs piping movement by flexural motion and rotation of the ball relative to the housing
3.2
ball
spherical element that can be freely flexed and rotated within the maximum angular flex, with one end connected with a piping
3.3
housing
element accommodating a ball, a ball bushing, a sealing ring and a sealing packing, with one end connected with a piping
3.4
ball bushing
element that is used to bear the internal pressure thrust of the heating network and can form a seal box with the ball and the housing
3.5
injection nozzle
device for filling a seal box with sealing packing, which is classified into ordinary one and rotary-valve one. Ordinary injection nozzle only fills the seal box with sealing packing when the heating network stops running, while the rotary-valve injection nozzle can fill the seal box with sealing packing when the heating network runs/stops running
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 General requirements
6 Inspection requirements
7 Inspection methods
8 Inspection rules
9 Drying and painting
10 Marking, packaging, transportation and storage
Annex A (Normative) Inspection methods of rotating torque
