Ring joint gaskets manufacturing process

ring joint gaskets manufacturing process:

raw metal purchase, ring rolling, heat-treatment, machining, identification marking, storage, packing, delivery

Manufacturing process-raw material purchase

Wrought materials shall be formed using hot working practices that produce a wrought structure throughout.
All heat-treatment operations shall be performed using equipment qualified in accordance with the requirements specified by the manufacturer.
Time at temperature and thermal cycles shall conform to the manufacturer’s heat-treatment specifications.
At least one Rockwell or Brinell hardness test shall be performed on the QTC after the final heat-treatment cycle.

Manufacturing process-product inspection

Personnel performing visual inspection for acceptance shall take and pass an annual vision examination in accordance with the manufacturer’s documented procedures that meet the applicable requirements of the following:
ISO 9712, or ASNT SNT SNT-TC-1A, or a national or international standard that is equivalent to ISO 9712 or ASNT SNT-TC-1A.
All other peronnel performing measurements, inspections, or tests for acceptance shall be qualified in accordance with the manufacturer’s documented procedures and requirements.
Dimensipal inspection shall be performed on ring joint gasket according to API 6A specification.
Sampling shall be in accordance with the manufacturer’s documented requirement.
The manufacturer’s documented procedures shall be followed.
As a minimum, sampleing shall be performed on completed ring joint gaskets in accordance with ISO2859-1:1999,level 2,1.5AQL

Design Tolerance:

Unless otherwie specified in the appropriate table or figure, the tolerances in the Table 1 shall apply to dimensions included in this specification.
Table 1- Tolerances, Unlesss Otherwise Stated

SI		USC
Dimension	Telerance(mm)	Dimension	Telerance(in.)
x.x	±0.5	x.xx	±0.02
x.xx	±0.13	x.xxx	±0.005