anyone hate pdf's as much as I do? perverting the soul of the web. In this case however, it's probably the simplest way to post a 164 page document. maybe not. anyway, here is an abstract in case you were wondering whether it was worth downloading.
SECTION 1. GENERAL 078-1.1 INTRODUCTION 078-1.1.1 Seals are devices which prevent or control the escape of fluids or gases and prevent entry of foreign materials. There are hundreds of sealing devices and it is impossible to cover each one in this volume. This volume describes a number of the sealing devices used aboard Navy ships. Emphasis is placed on devices which are covered by military specifications or are interchangeable with devices used in standard configuration glands. Packings and gaskets are covered in Volume 2. 078-1.2 DEFINITIONS 078-1.2.1 GASKETS, PACKINGS, AND SEALS. In common usage, gaskets, packings, and seals are terms which are often used interchangeably. The seals covered in this volume include those preformed sealing devices that are manufactured to a specific size for a specific application along with any associated glands, rings, springs, and other auxiliary devices. Gaskets and packings, as defined below (paragraphs 078-1.2.1.1 and 078-1.2.1.2), are not covered in this volume. 078-1.2.1.1 Gasket. This term is applied to material used to provide a static seal between two mechanical joints, in which the sealing material is dependent on mechanical compression to form the seal. A gasket is often used to seal mating surfaces without a gland, where low differential pressure exists across the seal boundary. Gaskets are usually punched or cut from a sheet of thin, somewhat resilient material (see Volume 2). 078-1.2.1.2 Packing. This term is applied to material used to provide a seal in a mechanical coupling where some form of movement between the surfaces to be sealed is intended or anticipated. Packing material usually consists of bulk deformable materials which are shaped by manually adjusted compression to obtain and maintain effectiveness (see Volume 2). 078-1.2.1.3 Sealing Device (Seal). A seal is a device which prevents the escape of a fluid or gas or entry of a foreign material. 078-1.2.2 GENERAL TERMS. The terms defined in paragraphs 078-1.2.2.1 through 078-1.2.2.4 are frequently used in describing a sealing device. 078-1.2.2.1 Durometer Hardness. Durometer hardness is an indication of the hardness of the sealing material as determined by an indentor (see paragraph 078-2.2.5). 078-1.2.2.2 Squeeze. Squeeze is the amount by which a seal is compressed (distorted from its molded shape) when installed in the gland. 78-1 078-1.2.2.3 Dynamic Seal. A dynamic seal is a sealing device used between parts that have relative motion, such as piston or shaft seals. 078-1.2.2.4 Static Seal. A static seal is a type of seal where there is no relative motion between the seal and any parts in contact with the seal. Limited freedom may be provided to permit the seal to change its shape within the gland under pressure. 078-1.2.3 TYPES OF SEALING DEVICES. Sealing devices are often described by their shape or what they seal. some of the more commonly used types are listed in paragraphs 078-1.2.3.1 through 078-1.2.3.22. 078-1.2.3.1 O-Ring. An O-ring is a ring (seal) which has a round cross section. 078-1.2.3.2 Piston Ring. A piston sealing ring is usually one of a series and is often split to facilitate expansion or contraction. 078-1.2.3.3 Scraper Ring. A scraper ring is a ring which removes material by a scraping action. 078-1.2.3.4 T-Ring. A T-ring is a ring which has a T-shaped cross section. 078-1.2.3.5 U-Ring. A U-ring is a ring which has a U-shaped cross section. 078-1.2.3.6 V-Ring. A V-ring is a ring with a V-shaped cross section. 078-1.2.3.7 Wiper Ring. A wiper ring is a ring which removes material by a wiping action. 078-1.2.3.8 Cup Seal. A cup seal is a sealing device with a radial base integral with an axial cylindrical projection at its outer diameter. 078-1.2.3.9 Diaphragm Seal (Flat Diaphragm). A diaphragm seal is a relatively thin, flat or molded sealing device fastened and sealed at its periphery with its inner portion free to move. 078-1.2.3.10 Dished Diaphragm Seal. A dished diaphragm seal is a diaphragm in which the central area is depressed in a free state permitting longer travel than a comparable flat diaphragm. 078-1.2.3.11 Flange (Hat) Seal. A flange (hat) seal is a sealing device with a radial base integral with an axial projection at its inner diameter. 078-1.2.3.12 Lip Seal. A lip seal is a sealing device which has a flexible sealing projection. 078-1.2.3.13 Mechanical Seal. A mechanical seal is a sealing device in which sealing action is aided by mechanical force. 078-1.2.3.14 Oil Seal. An oil seal is a sealing device which retains oil. S9086-CM-STM-010/CH-078V1R2 Steve Spence Subscribe to the Renewable Energy Newsletter & Discussion Boards. 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