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This Month's FEATURED PRODUCTS
from Associated Valve

Product Manufacturer: Douglas Barwick

Douglas Barwick Stainless Steel Elbows Douglas Barwick logo

Douglas Barwick Inc. is Canada's largest manufacturer of light wall stainless steel pipe and fittings. With the experience and expertise developed from more than a century of growth in the fabrication of metal products, we stand at the forefront in terms of quality, standards diversity, product and materials range and customer satisfaction.

Douglas Barwick Inc.'s stainless steel piping products can be found in service around the world. With our product warehouses in strategically positioned locations in Canada, we can deliver your stainless steel pipe and fittings needs quickly and efficiently.

The main pipe manufacturing operation is located in Brockville (Ontario). It produces light wall stainless steel pipe and fittings in accordance with the FPAC (Forest Products Association of Canada, formerly known as CPPA - Canadian Pulp and Paper Association), TAPPI (Technical Association of the Pulp & Paper Institute) and ASTM / ASME specifications. The diameters range from ¾ inch IPS up to 96 inches, with pipe wall thicknesses ranging from 14 ga (0.083") to 0.375 inch.

 

 
Douglas Barwick logo

Douglas Barwick: Featured Product #1

IPS A312 Pipe (ASME SA312)

This specification covers seamless and straight-seam welded stainless pipe intended for high temperature and general corrosion service.

The A312 manufacturing process is suited to high-volume production and is generally limited to the diameters and schedule wall thickness shown in ANSI B36.10 and ANSI B36.19. (Specialty items can be ordered)

A312 pipe is available for immediate delivery from a complete inventory of standard sizes up to 24".

The principal manufacturing procedures specified under A312 are:

  • Automatic welding process with no addition of filler wire
  • Annealing after welding
  • Tension, Reverse, forward-bend and hardness tests of each lot
  • Hydrostatic of each tube
  • Wall thickness may not be more than 12.5% under nominal thickness

A312 pipe is normally furnished in square cut ends, but pipe with beveled ends can be provided.

Spot radiography or 100% radiography can be provided on all weld seams.

A312 pipe is pickled and passivated as per ASTM A380 to maintain corrosion resistance and to prevent surface discoloration from free iron oxidation.

 

Douglas Barwick Featured Product #2

IPS/ASTM A403 Fittings

Standard Specification for Wrought Austenitic Stainless Steel Piping fittings.

This specification covers two general classes, WP and CR, of wrought austenitic stainless steel fittings of seamless and welded construction covered by the latest revision of ANSI B16.9, ANSI B16.11, ANSI B16.28, MSS Standard Practice SP-79, MSS Standard Practice SP-43 and Mss SP-95. Fittings differing from these standard may be furnished in accordance with Supplementary Requirement S9.

Class WP fittings are subdivided into four subclasses: Classes WP-S, WP-W, WP-WX and WP-WU. They are manufactured to the requirements of ANSI B16.9, B16.11,B16.28, or MSS Standard Practice SP-79, and they shall have pressure ratings compatible with 9.2.

 

  • Class WP-S fittings are those manufactured from seamless product by a seamless method of manufacture (marked with class symbol WP-S);
  • Class WP-W fittings contain welds made with or without filler metal. Pipe or fitting fabrications made with filler metal have been radiographed (marked with Class symbol WP-W);
  • Class WP-WX fittings are those which contain welds where all welds have been radiographed (marked with class symbol WP-WX);
  • Class WP-WU fittings are those which contain welds where all welds have been ultrasonically tested (marked witch call symbol WP-WU);
  • Class CR fittings are those manufactured to the requirements of MSS SP-43, and they shall have pressure ratings compatible with 9.3. With no nondestructive testing required.

     

    Carbide solution heat treatment is required which includes rapid cooling to prevent re-precipitation of carbides.

     
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