INSULATOR FOR PIPE ACCOUTERMENTS AND THE LIKE

• US 3,556,158 A
• Filed: 04/26/1967
• Issued: 01/19/1971
• Est. Priority Date: 04/26/1967
• Status: Expired due to Term

• Current Assignee: Schneider, Marvin
• Original Assignee: Schneider, Marvin
• Inventors: Schneider, Marvin
• Application Number:
  US04/633,802
• Time in Patent Office: 1,364 Days
• US Class Current: 138/149
• CPC Class Codes: F16K 27/12 Covers for housings
• CPC Class Codes: F16L 59/161 Housings for valves, tee pieces, or the like
• CPC Class Codes: Y10T 137/7036 Jacketed
• CPC Class Codes: Y10T 29/49405 Valve or choke making

Abstract

This patent deals with insulators formed of a pair of blanks. Each blank comprises a rigid outer shell with one open face, and interiorly of the shell is a block or insert of a novel polyurethane foam. The blanks are particularly adapted for insulating pipe accouterments such as valves, flanges, traps, etc. in which the accouterment being insulated acts as a die for forming the foam to substantially conform to the contour of the accouterment.

Claims

1. An insulator for a piping accouterment comprising at least a pair of blanks, each blank including:

an outer shell having one completely open side and of a material which may be readily cut out to provide openings which afford passage of a portion of the piping accouterment therethrough; and

a foamed polyurethane block in each of said shells having a compression yield strength of at least 5 p.s.i. and projecting outwardly of aid one open side;

said polyurethane having a coefficient of thermal conductivity no greater than .16 B.t.u.'"'"''"'"'s per hour, per square foot, per inch length, per degree F.;

said block having a friability to permit shear to occur in the cell structure and to permit cell collapse upon application of external physical pressure greater than 5 p.s.i.;

said blanks dimensioned for positioning on opposite sides of said accouterment whereby forcing said blanks together with said accouterment therebetween causes the outwardly projecting parts of one of said blocks to mate with a corresponding part of said other blank along at least some of their peripheral boundary, substantially enclosing said accouterment and causing said foam to deform and assume a shape substantially conforming to the portion of the accouterment impressed therein, and means to hold one of said pair of blanks in position against the other of said pair of blanks thereby insulating said accouterment.

2. An insulator for piping accouterments in accordance with claim 1 wherein said foamed polyurethane is a rigid foam having a closed cell content of between approximately 80-95 percent.

3. An insulator for a piping accouterment in accordance with claim 3 wherein the friability of said foam is such as to permit shear of said cell structure in planes substantially normal to the surface of said block when deformed by an accouterment.

4. An insulator for a piping accouterment in accordance with claim 1 wherein said foamed polyurethane block has an upper compression yield strength of 20 p.s.i.

5. An insulator for a piping accouterment in accordance with claim 1 wherein the cell shape of said foam fillers is elliptical with the short axis thereof substantially perpendicular to said open side.

6. An insulator for a piping accouterment in accordance with claim 1 wherein said shell is composed of a material impermeable to vapor.

7. An insulator for a piping accouterment in accordance with claim 1 wherein said shell is a rigid material having sidewalls and a back wall, said sidewalls being tapered away from said open side and merging into said back wall.

8. An insulator in accordance with claim 7 wherein said material is a polyvinyl chloride

9. An insulator according to claim 1 wherein the formulation of said polyurethane foam includes 0.25-3 percent by weight of carbon black.

10. An insulator according to claim 1 wherein the formulation of said polyurethane foam includes a predetermined amount of blocked amine.