H. K. Porter Company Pipe Insulation (Yarway)

Product Description

H. K. Porter Company was a diversified American industrial manufacturer with roots stretching back to the nineteenth century. Operating across multiple product lines and subsidiary relationships, H. K. Porter became associated with a range of industrial materials sold into heavy manufacturing, chemical processing, power generation, and related sectors. Among the products connected to H. K. Porter through manufacturing and distribution relationships is pipe insulation produced or supplied under the Yarway name.

Yarway Corporation, which operated as a manufacturer of steam specialty products and related industrial components, produced materials intended for use in high-temperature piping systems. Pipe insulation manufactured or distributed through this network was designed to reduce heat loss, protect workers from burn hazards, and improve energy efficiency in industrial facilities where steam and hot-process piping ran throughout buildings, boiler rooms, and mechanical spaces. These insulation products were sold to and installed in facilities including refineries, power plants, paper mills, chemical plants, shipyards, and manufacturing facilities across the United States during the decades when asbestos use in industrial products was widespread.

Pipe insulation of this type was a standard component in virtually every large industrial facility constructed or renovated during the mid-twentieth century. Products were typically specified by engineers, purchased by facility owners or contractors, and installed by tradespeople and industrial workers who handled the material regularly as part of routine construction, maintenance, and repair work.

Asbestos Content

Pipe insulation associated with H. K. Porter Company and the Yarway product line contained chrysotile asbestos. Chrysotile, commonly referred to as white asbestos, is the most widely used form of asbestos in industrial and construction products throughout the twentieth century. It belongs to the serpentine mineral group and was valued for its flexibility, tensile strength, and resistance to heat and chemical degradation — properties that made it particularly suitable for insulation materials applied to high-temperature steam and process piping.

In pipe insulation products, chrysotile asbestos was typically incorporated into the insulating matrix itself, bound with calcium silicate, magnesia, or other mineral compounds to form rigid sections or block insulation that could be cut, shaped, and fitted around pipes of various diameters. The asbestos fibers contributed both thermal resistance and structural integrity to the finished product.

Chrysotile asbestos has been classified as a known human carcinogen by the International Agency for Research on Cancer (IARC) and is regulated as a hazardous substance under OSHA’s asbestos standards (29 C.F.R. § 1910.1001 for general industry and 29 C.F.R. § 1926.1101 for construction). The Asbestos Hazard Emergency Response Act (AHERA) and subsequent EPA regulations further establish the hazardous nature of asbestos-containing materials and the precautions required when they are disturbed.

How Workers Were Exposed

Industrial workers generally represent the primary population documented as having exposure to pipe insulation products associated with H. K. Porter Company and Yarway. Exposure occurred through multiple pathways inherent to the lifecycle of asbestos-containing pipe insulation in industrial settings.

Installation: Workers who cut, shaped, and fitted pipe insulation sections around steam lines, boiler feed lines, and process piping generated significant quantities of airborne asbestos dust. Cutting rigid insulation sections with hand saws or power tools released chrysotile fibers into the breathing zone of the installer and nearby workers.

Maintenance and Repair: Industrial facilities required ongoing maintenance of their piping systems. Workers who removed sections of existing insulation to access valves, flanges, and pipe sections for repair disturbed aged and often friable insulation material. Asbestos-containing insulation that had been in service for years was frequently more friable than newly installed material, releasing fibers more readily upon disturbance.

Bystander Exposure: Workers in adjacent trades — operators, instrument technicians, supervisors, and others present in the same facility areas — could be exposed to asbestos fibers released by insulation work occurring nearby. In enclosed industrial spaces with limited ventilation, fiber concentrations could affect workers who were not directly handling the insulation products.

Routine Workplace Presence: In facilities where asbestos pipe insulation was installed on virtually every steam and process line, simply working in mechanical rooms, boiler houses, or along pipe runs placed workers in proximity to insulation that shed fibers through normal aging, vibration, and physical contact.

This article is provided for informational purposes only and does not constitute legal advice. Individuals with potential asbestos exposure claims should consult a qualified attorney.

Documented Product Identification

The following details are drawn from public asbestos litigation records, manufacturer catalog pages, technical manuals, and corporate history materials. Each item reflects the product as documented in those sources.

Documented asbestos-use period: 1920s-mid 1980s

Corporate context: Formed in 1908 as Simplex Engineering Company. Purchased by Keystone International in the 1980s, then sold to Tyco International in 1997. Currently a subsidiary of Tyco Flow Control Group.

Documented asbestos components: gaskets, packing, insulation.

Documented asbestos-component suppliers: the public records lists the following external suppliers of asbestos-bearing packing, gaskets, and seals used in conjunction with this manufacturer’s equipment — Johns-Manville, Manhattan Asbestos.

Industries served: Power plants, Petroleum refining, Marine/Naval.

Naval / marine service: This manufacturer’s equipment is documented in connection with U.S. Navy and commercial-marine service.

Documented product lines:

  • Boiler trim valves (1930s-present). Valves used for servicing vents and drains within boilers — asbestos components: gaskets, packing.
  • Gauges (1945-1965). Gauges for viewing water levels within a boiler — asbestos components: gaskets, packing.
  • Indicator systems (1945-1965). Level indication equipment for boiler levels
  • Steam control valves (1945-present). Valves used for controlling steam flow — asbestos components: gaskets, packing.
  • Steam traps (1945-present). Devices used to remove condensate from steam systems — asbestos components: gaskets, packing.
  • Hand-operated globe valves. Manually operated globe valves supplied to petroleum industry and marine applications — asbestos components: gaskets, packing.

Yarway began transitioning from asbestos to expandable graphite components in 1982-1983, a process that took approximately 5 years to complete. On ships, Yarway products were always insulated and contained asbestos gaskets and packing.