Quality control
Calibration Intervals
• Calibration intervals shall be established for calibrations based on
repeatability and degree of usage.
• Calibration intervals shall be a maximum of three (3) months until
recorded calibration history can be established by the manufacturer.
• Intervals shall be shortened and may be lengthened based on review of
the calibration history and determination of interval adjustments as
defined in the manufacturer’s written procedure. Increments to establish
longer intervals shall be limited to three (3) months maximum.
• The maximum calibration period shall not exceed one (1) calendar year.
• Personnel performing visual inspections of welding operations and
completed welds shall be qualified and certified as either:
• AWS QC1 or equivalent certified welding inspector or;
• AWS QC1 or equivalent senior certified welding inspector or;
• AWS QC1 or equivalent certified associated welding inspector, or;
• welding inspector certified by the manufacturer’s documented
training program
Testing
• Test fluid shall be fresh water, shall contain a corrosion inhibitor. Based on
the end location of the valve the test fluid shall have, antifreeze (glycol)
unless otherwise agreed.
The water temperature shall not be no greater
than 100 F (38 C) during the testing period.
• All hydrostatic and pneumatic shell tests specified shall be performed with
the valve unseated and partially open and may also be performed with the
valve fully open, provided the body cavity is simultaneously filled and
pressurized through a cavity connection.
• Supply pressure shall be isolated from the valve being tested and shall be
stabilized prior to the start of pressure testing duration.
The pressure
measuring device shall be installed in the test apparatus in such a manner
that the device continuously monitors/records the test pressure of the valve
assembly.
The pressure test shall be held for the minimum test durations
listed in Tables 4, 5, and 6 after stabilization as determined by the
manufacturer.
Coating
• All non-corrosion-resistant valves shall be coated externally in accordance
with the manufacturer’s standards, unless otherwise agreed. If external
coating operations are performed by the manufacturer or their coating
contractor, preventative measures shall be taken to assure that no foreign
material enters the internal cavity of the valve that may impact the valve
function.
• Flange faces sealing surfaces, weld bevel ends and exposed stems shall
not be external coated. See Annex M to provided details on where coat is
not allowed.
• Corrosion protection shall be provided using the manufacturer’s
documented requirements for flange faces, weld bevel ends, exposed
stems and internal surfaces of the valve.
Marking
• If a product or component is marked in accordance with the product
specification and the API monogram is applied (i.e., monogrammed
equipment), and it is subsequently determined that the product fails
to satisfy any applicable requirements of this specification, the
nonconformance(s) should be reported to the API Monogram
Program per the Monogram Program Annex (see Annex A.6).
• Each valve shall be provided with an austenitic stainless steel
nameplate securely affixed and so located that it is easily
accessible.
The nameplate shall be attached to the valve body,
however based on valve design the nameplate maybe attached the
bonnet/cover or closure /end-connector at the option of the
manufacture.
• The marking on the body, end connector and bonnet/cover and
nameplate shall be visually legible.
• The body marking shall be minimum letter size shall be 0.25 in.
• The nameplate minimum letter size shall be .125 in (3 mm) on valves
sizes NPS 2 (DN 50) and larger. All valves NPS 1.5in (DN 38) and
smaller, the nameplate letter size shall be per the manufactures standard.
• On valves whose size or shape limits the body markings, they may be
omitted in the following order:
a) manufacturer’s name or trademark;
b) material;
c) rating;
d) size