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Valve Inspection and Testing API STANDARD 598 (1-4)

Author: Date: 2023/9/27 15:40:07

API STANDARD 598

ELEVENTH EDITION, FEBRUARY 2023

Scope

1.1This standard covers inspection, examination, supplementary examinations, and pressure test requirements for resilient-seated, nonmetallic-seated (e.g., ceramic), and metal-to-metal-seated valves of the gate, globe, plug, ball, check, and butterfly types. Resilient seats are considered to be:

a)Soft seats, both solid and semisolid grease type (e.g., lubricated plug);

b)Combination soft and metal seats (e.g., laminated seat rings);

c)Any other type of seat material designed to meet resilient seat leakage rates as specified in Table 5.

This standard supplements the API standards that reference it, but it may also be applied to other types of valves by agreement between the purchaser and the valve manufacture. See Annex A for information to be specified by the purchaser.

1.2The inspection requirements pertain to examinations and testing by the valve manufacture and any supplementary examinations that the purchaser may require at the valve manufacture’s plant. The test requirements cover both required and optional pressure tests at the valve manufacturer’s plant or at a facility mutually agreeable to both the manufacturer and the purchaser.

1.3The following tests and examinations are specified in this standard:

a)Shell test;

b)Backseat test;

c)Low-pressure closure test;

d)High-pressure closure test;

e)Double block and bleed high-pressure closure test;

f)Visual examination of castings;

g)High-pressure pneumatic shell test.

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.

API Standard 594, Check Valves: Flanged, Lug, Wafer and Butt-welding

API Standard 602, Gate, Globe, and check valves for sizes DN100 (NPS 4) and smaller for the petroleum and Natural Gas Industries.

API Standard 609, Butterfly Valves: Double-flanged, Lug-and Wafter-type

ASME B16.11, Forged Fittings, Socket-Welding and Threaded.

ASME B16.34, Valves-Flanged, Threaded, and Welding End

MSS SP-45, Bypass and Drain Connections

MSS SP-55, Quality Standard for Steel Castings for Valevs, Flanges and fittings and other piping components visual method for evaluation of surface irregularities

MSS-SP-91, Guidelines for manual operation of valves

3 Terms and Definitions

For the purposes of this document, the following terms and definitions apply.

3.1 backseat test

A pressure test used to verify leakage past the stem or shaft to bonnet seal (backseat)

3.2 class

A dimensionless number used to designate the pressure-temperature rating of a valve or piping component.

3.3 closure test

A pressure test used to confirm leakage past or through a valve’s closure mechanism.

3.4 cold working pressure CWP

Rated pressure at ambient temperature.

3.5 Diameter nominal DN

An alphanumeric designation of size that is common for components used in a piping system, and that is used for reference purposes. It comprises the letters DN followed by a dimensionless number indirectly related to the physical size of the bore or outside diameter of the end connection as appropriate. The dimensionless number following DN does not represent a measurable value and is not used for calculation purposes, except where specified in ASME B16.34.

3.6 double block and bleed valve DBB

A single valve with two seating surfaces that in the closed position, provide a seal against pressure from both ends of the valve with a means of venting/bleeding the cavity between the seating surfaces.

3.7 nominal pipe size NPS

An alphanumeric designation of size that is common for components used in a piping system, and that is used for reference purposes. It comprises the letters NPS followed by a dimensionless number indirectly related to the physical size of the bore or outside diameter of the end connection as appropriate. The dimensionless size identification number following NPS does not represent a measurable value and is not used for calculation purposes, except where a specified in ASME B16.34. Prefix NPS usage is applicable to valves bearing class designations.

3.8 shell test

A pressure test in excess of the cold working pressure (CWP) rating of the valve for the purpose of validating the soundness and strength of the valve pressure-containing structures.

3.9 visually detectable leakage

Leakage during a valve pressure test, either through or past a pressure boundary or closure member that is validated by normal vision.

4 Inspection, Examination, and Supplementary Examination

The purchaser shall specify in the purchase order intention to inspect valves and witness tests and examinations at the valve manufacturer's plant. With proper notification per 4.3, the purchaser's inspector shall have access to any part of the plant concerned with manufacture of the valves whenever work on the order is under way. Witnessing may be performed by remote means (video).

4.1 Inspection at the Valve Manufacturer's Plant

4.2 Inspection Outside the Valve Manufacturer's Plant

When the purchaser specifies that the inspection will include pressure-containing parts or components manufactured at locations other than the valve manufacturer's plant, these parts and components shall be subject to the valve purchaser's inspection at the location where they are manufactured. Witnessing may be performed by remote means (video).

When inspection by the purchaser is specified, the valve manufacturer shall notify the purchaser prior to the required valve testing and any specified supplementary inspections or examinations, addressing the notice as stated in the purchase order or as mutually agreed with the purchaser.

The extent of inspection may be specified in the purchase order and, unless otherwise indicated, will be limited to the following:

a) inspection of the valve during assembly to ensure-compliance with the specifications of the purchase order;

b) witnessing of the required and specified optional pressure tests and examinations;

4.3 Inspection Notice

4.4 Extent of Inspection

The extent of inspection may be specified in the purchase order and, unless otherwise indicated, will be limited to the following:

a) inspection of the valve during assembly to ensure compliance with the specifications of the purchase order;

b) witnessing of the required and specified optional pressure tests and examinations;

c) witnessing of any supplementary examinations (see 4.6);

d)review of mill records and nondestructive examination records (including specified radiography).

4.5 Examination

4.5.1 A visual examination shall be performed by the valve manufacturer on all castings of bodies, bonnets, covers, and closure elements to ensure conformance with MSS SP-55.

4.5.2 Each valve shall be examined to ensure compliance with this standard, purchase order requirements, and the referenced product standard (e--, API Standard 599).

4.4 Extent of Inspection

4.5.3 All examinations shall be performed in accordance with written procedures that comply with the applicable standards.

4.6 Supplementary Examination

Products Catagories

Flange End Valve Test Bench (9)

Horizontal Valve Test Bench (8)

Vertical Valve Test Bench (5)

Butterfly Valve Test Bench (7)

6A Valves Test Bench (4)

H.P Safety Valve Test Bench (11)

Fluid and Gas Booster Unit (4)

Breathing valve test bench (1)

Planet Lapping Machine (1)

Ball Lapping Machine (1)

Seat Ring Lap Machine (0)

Portable Valve Grinder (5)

Valve Life and Torque Test Machine (0)

Container within Test Machine (0)

Contact Information

Shanghai Zengxin Machine Electron Technology Co.,Ltd
Add: No.165 Hengfei Road, Jiading District, Shanghai China
Tel.: 0086-137 0588 0773
Fax: 0086-21-59586599
Email: info@valvestest.com
Msn: Wechat: benqpan
Skype: benqpan
Web: http://www.valvestest.com