US1698655A

US1698655A - Acid-resistant packing

Info

Publication number: US1698655A
Application number: US728369A
Authority: US
Inventors: Rautenstrauch Walter
Original assignee: METALASTIC Inc
Current assignee: METALASTIC Inc
Priority date: 1924-07-26
Filing date: 1924-07-26
Publication date: 1929-01-08
Anticipated expiration: 1946-01-08

Description

' No Drawing.

ane-.11.... a, 1929-.-

UNITED STATES- PATENT-lorries.-

WALTER namrnnsrnaucn. or rALIsAnE, NEW JERSEY, .ASSIGNOR .ro mnrarasrlc me or mnsEY'crrY, NEW JERSEY, A ooarona'rron or NEW JERSEY.

ncrp-rmsrsra rir rack-me.

This invention relates to chemical resistant 'packings and is herein disclosed as embodied may be present insmall quantity onlyso that in packings especially adapted for stufling boxes in which acidssuch as sulphuric, nitric,- hydrochloric, citric, acetic, and tartaric come into contact-with the packing. According to the" present invention the packing includes it mainly is present as "a coating on the metal and asbestos and serves to hold them together and also serves to bind to these any solid lubricant present. Preferably the packing also, includes a solid lubricant such as graphite.

- By observing the proper order of mixing -and using metal in a suitablef orm it is possible to prepare apackingwhich will contain a. large proportionof metal in such form that 2 it will not extrude through the clearance spaces between the fixed arts and moving parts of a stufling box. uchia-packing is very eflicient, having ,lon li eflicient of frictions The following has been I a satisfactory packing from every point of view for attainmgsuch and other ends-z 75 pounds of lead: containing one-half of one per cent. of antimonywas mixed in'an -Abbe mixer with 4' pounds of long, carded asbestos fibre to disintegrate the clumps of the fibre. The lead was 1n the form of small -.pieces, herein called chips, largely to inch long and mostly under 1 inch wide, The asbestos was Mapleleaf Crude v8n Fibre Corporation, A. T. asbestos, varying from about 3 mm. in length and 0.25 mm. in diameter, to about 7 mm. in length and 1.5 mm. in diameter. The asbestos wasfirst put through a picker having gripping feed rolls which delivered the fibreto a spike-covered rapidly revolving cylinder which had a disintegrating andcarding efiect The mixer had two concentric horizontal {shafts each carrying two blades working in a semicircular trough and rotatingiin opposite diIGCtlOIlS so as to feed'the material toward the center while stirringand mixin-g it.

Application filed Ju1y 26,

foun

1924. Serial No. 728,369.

Afterethe asbestos was disintegrated and i pounds of Dixons .#2 flake graphite.- The whole was then thoroughly mixed to produce thefinal packing.

The final product of this procedure was a sulphuric acid resistant packing. It was largely a fairly hard lumpy material in masses varying from a quarter to a half-inch or even an inch across, in which the graphite appeared for the most part'closely bound either to the fibre and/or as a thin. coating on the metaL; In some of the larger lumps the metal chips were closely packed. together, matted together. was in the form of loose agglomerated granules. The fibre was almost as closely bound.

A little of the graphite together as were the metal chips, and granules of graphite clung to projecting fibres. Although the above description is limited to-a packingresistant to. sulphuric acid, the invention is in no wise restricted thereto.

Packings resistant to variousother'acids mayv also be produced and are intended to be'em-- bracedby this invention. To produce apacking resistant to .any particular acid, it' is essential that the metallic ingredient of the packing be resistant to that particular acid. Thus, if a packing were to be used where it' would contact with nitric, hydrochloric, fruit acids or acids produced by fermentation, the metallic ingredients should be aluminum, copper or' tin respectively. The following illustrates a few of the specific examples of packings resistant to various acids: J Peaking resistant to fruit acids of acids giroduced by fgrmentatz'on.

4 lbs. carded asbestos fibersa 13 lbs. oily material (3 lbs. tristearim con- I taining less .,5 free fatty acid and mixed with 10 lbs. of paraflin) 10 lbs. Dixons N0. 2 flake graphite. I

so 1bs. Dixons No. 2 flake graphite.

resistant to hydrochloric acid.

73 lbs. 4: lbs. 10 lbs.

cop r (annealed).

car ed asbestos fibers.

oilymaterial comprising 1 lbs. parowax which has been previously v mixed with 3 lbs. C-706 oil.

10 lbs. Dixons No. Q'flake graphite.

Packzhig resistant to nitric acid.

55 lbs. aluminum.

lbs. carded asbestos fibers. lbs. parowax.

'To pack stufling boxes, the packing is heated to bring it into plastic form, and then asbestos, both thoroughly coated wit-ha pethe stuffing box is packed.

Having thus described certain embodiments of the invention, what is claimed is,

-1.An acid-resistant packing consisting largel of lead particles, and also'containing as estos, both thoroughly coated with an .a graphite acid-resisting Waxy material, coating on the lead and asbestos, and also containing other graphite' v 2. An acid-reslstant packing consisting largely of lead particles, and also containing asbestosfiaoth thoroughly coated with a small quantity of an acid-resisting waxy material,

a graphite coating on the lead and asbestos, and also containing other graphite.

3. An acid-resistant packing consisting largely of lead particles, and also containing troleum wax, agraphite coating on the lead and asbestos, and also containing I other graphite.

4. An acid-resistant packing consisting largely of lead particles, and also containing asbestosfboth thoroughly coated withparaflin wax, a graphite coating on the'lead v and asbestos and palso containing other graphite.

5. An acid-resistant packing consisting largely of lead particles, and also containing asbestos, both thoroughly coated with a small quantity ofparatfin wax, a graphite coating v on the lead and asbestos, and also containing 'other' graphite.

6. An acid-resistant packing containing about 75% of lead particles, about 4% oi asbestos fibre, about 10% of paraflin wax k coating the lead and asbestos, and about 11% of graphite, the packing being in the form of lumps. V

7. A packing material consisting largely of lumpy aggomera tes of graphite-coated lead bound togethenwith fibre, and other which it comes in contact in its intended use. and asbestos, both coated with an acid-resist mg waxy material, and graphite, said graphite coating the metal particles andasbestos and also being presentin'the form of loose agglomerated particles. I u

10. An acid-resistant packing-comprising metal particles resistant to the acid with asbestos, an acid-resisting waxy material, and

whichit comes in contact in itsintended use,-

graphite, sa i d graphite being-present in an amount inexcess of that required to coat the I metal particlesand asbestos. In testimony whereoflI have-aflixed my signature to this specification.

'WALIER BA UTENSTRAUCH;