Title:

Piping and Valves

Doc. No.

L-001

Annex

F

VSK

Project: NORSOK

Company:

Rev.Date:

 20.09.99

Rev:

3

ID

DATE

VSK. TEXTS

109

20.06.94

All valves:

All components not specified in the VDS shall have equivalent to or better corrosion resistance than the component they are coupled to. Asbestos containing material is not permitted.

15.12.97

Carbon steel valves and gearboxes shall as a minimum be primed according to NORSOK standard M-501; "Surface protection and protective coating".

20.09.99

Externally exposed components in austenitic stainless steel shall minimum be of type 316 (L) SS.

20.09.99

Fabrication welding of pressure retaining components and attachments welded onto those components shall be carried out according to NORSOK Standard M 601, "Welding and Inspection of Piping Systems". Welding of other valve components shall be carried out according to welding procedure specifications to ASME IX.

20.09.99

Assembly drawing of the valve shall be supplied with the bid, and shall at least show:

• All parts of the valve with material standard and grade, MDS when specified in the VDS and manufacturers part number.
• All welds including hard facing and overlay with reference to applicable welding procedure.
• Overall dimensions.
• Weight.
• Manufacturers name and grade of soft material.

20.09.99

All valves with graphite stem packing, desity of graphite to be 1.3 to 1.7 g/cm3.

110

20.06.94

All valves exept check valves:

The stem or other sliding elements and plugs shall have a hardness and surface finish in order to avoid galling.

112

20.06.94

Ball and gate valve:

The following valves shall be equipped with a drain plug in bottom of the valve body:

113

20.06.94

Ball valves > = 4":

Valves shall have a stem lubrication fitting for lubrication of stem.

116

20.09.99

All Ball/Butterfly:

Valve shall be inherently antistatic or fitted with an antistatic device. An internally screwed stuffing box is not permitted. The gland packing and gland shall be compressed independently of the stem nut such that rotation of the stem shall not impart forces into the gland or gland packing.

20.09.99

All valves

ENP is only accepted used on stainless steel substrates to reduce friction, in cases were this problem can not be solved in an optimal manner by other solutions e.g.: material selection, hard facing or thermal spraying. ENP shall not be used in valves for sea water or other corrosive services.

15.12.97

All valves:

In case where referenced end to end dimension is different to referenced design code, the referenced end to end dimension shall be used.