Recirculation from pump discharge through flow control orifice to the seal. If you are unable to identify the seal, it will be necessary for you to. John crane is an american company, now a subsidiary of smiths group and provider of engineered products and services including mechanical seals, couplings, seal support systems, filtration systems and. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. Piping plans help keep mechanical seals running cool and clean, promote safe handling of dangerous fluids, and extend the operational availability of rotating equipment. Mechanical seals technical manual brenner industrial sales. Installation of the new proflo seals covered single spring seal.
A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pumpmixer sealchamber housing. The seals are designed for universal use and fit perfectly into the installation spaces standardised in the chemical industry, e. Increase your ability to specify seals to improve mechanical seal reliability. Interchangeability completely interchangeable with the goulds model 3196 and extended pump life. New equipment operations startups can be particularly hard on mechanical seals, which is why it is critical to ensure that the pump seal chamber is filled. Improving the reliability of mechanical seals peerless pump. Mechanical seal applications mechanical seals the shaft seals used in rotating machinery such as pumps, hydraulic turbines, agitators and centrifuges play an important role in maintaining the safety and economic efficiency of machinery. For years, conventional mechanical seals have been used in applications where, often due to cost, cartridge seals were prohibitive. Mechanical seals consists primarily of a rotary seal face with a driving mechanism which rotates at the same speed as the pump shaft, a stationary seal. Packing although mechanical seals had been around for many decades, by 1955 industry had converted only a small. Viscous and sticky products creamy products, ointments, cosmetics, gels, etc determining the mechanical seal design and the appropriate materials for each application is. Probably the most widely recognized and also most common mechanical seal used in general service, low pressure applications. As previously stated, a pump with a throughshaft is not leakproof. A seal piping plan is designed to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal.
On both of the above setups, the installation of a suitable device is required to seal. The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different. The rotating and the fixed faces are the two vital parts of the mechanical seals. The seals are arranged by shaft size from smallest to largest. Because mechanical shaft seal failures are the number one cause of pump downtime, the writer decided to dedicate this column to mechanical seal basics. The stationary part of the seal is fitted to the pump housing with a static seal this may be sealed with an oring or gasket clamped between the stationary portion and the pump housing. The inboard or, primary seal keeps the product in the pump housing. The mechanical shaft seal is essentially a throttle arranged around the shaft. All are designed for a wide variety of services, ranging from water and wastewater, to chemical. Mechanical shaft seal types and sealing systems grundfos. A balanced, radially split end face mechanical seal that has seal faces, gaskets, and setting devices unitized into two semicartridge components. Mechanical seals explained the basics mechanical seals are leakage control devices, which are found on rotating equipment such as pumps and mixers to prevent the leakage of liquids and gases from escaping into the environment.
In plan 11, product is routed from the pump discharge to the seal chamber to provide cooling for the seal and to vent air or. At utex, we refer to this type as rs1 the assembly shown in the pump is configured with a. Mechanical seals are usually endface seals or rotatingface seals, but in some designs they can be circumferential or even a hybrid of liptype seals. The seal ring which rotates with the shaft is called the rotary ring. Failure to observe the instructions contained in this manual could result in personal injury and. Change a mechanical seal on the taco ta series pump. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal. Pump mechanical seal centrifugal, horizontal cn sealm series user manual this copy of the manual is a translation of the italian version and both manuals must be always furnished together model. A mechanical seal is a method of containing fluid within a vessel typi cally pumps where a rotating shaft passes through a stationary hou sing or occasionally. Mechanical seals the shaft seals used in rotating machinery such as pumps, hydraulic turbines. Mechanical seal leakage in pumps how much, if at all, mechanical seals do, must or must not leak is a controversial subject for which there are few clear answers. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. Figure 1 shows a typical centrifugal pump, which highlights its constituent parts, including the mechanical seal.
Sealplus mechanical seals goulds pumps pdf catalogs. Mechanical seals ekk technologies eagle industry co. A must read for all engineers, pump and seal professionals, end users, consulting engineers, distributors, and pump oems. A mechanical seal, figure 1, consists of a stationary member seat. This is essential when pumping or mixing a dangerous or toxic substance. Most common plans and sealing systems plan 53b plan 53c plan 52 used where the pumped product is. Years ago, most pump shafts were sealed using rings of soft packing, compressed by a packing gland, but this type of shaft seal required a fair amount of leakage just to lubricate the packing. Plan 11 is the default seal flush plan for all single seals. Taperedbore seal chambers promechanical seal basics mechanical seals provide a seal between a pump casing and a rotating shaft.
This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators, turbines, compressors, centrifuges, and. This seal design was amount the first single spring seals and proceeded the slightly less expensive type 21 seals. Sealing systems for pumpssealing systems for pumps part i presented by. Pump mechanical seal centrifugal, horizontal cn seal m series user manual this copy of the manual is a translation of the italian version and both manuals must be always furnished together model.
The outboard or, secondary seal prevents leakage of the flush liquid into the atmoshere. Taco is a manufacturer of hydronic systems and equipment for residential, light commercial, industrial and oem markets. Motoku water pump mechanical seal for suzuki lt250r quadracer ltz400 quadsport gsxr600 gsxr750 gsxr1100. Model 3196 iframe installation, operation, and maintenance manual 5 introduction and safety introduction purpose of this manual the purpose of this manual is to provide necessary information for. Double seals provide a level of safetyzero emissions compliance not possible with single seals. These seals virtually eliminate leakage of the fluid or gas being handled in pumps or mixers. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. The rotating face is connected to the rotating shaft while the. Berkeley b54585, model b3tpms, closecoupled centrifugal. The main parts of the mechanical seals are please refer the figure above.
Sealing systems for pumpssealing systems for pumps part i. Seal chamber and stuffing box both refer to a chamber, either integral with or separate from the pump case housing that forms the region between the shaft and casing where sealing media are installed. Double or dual mechanical seals are designed to ensure maximum sealing safety. Mechanical seals for pumps how mechanical seals work. High performance, high temperature cartridge mechanical seals are available from nearly all manufacturers for optimum sealing reliability. Berkeley b54585, model b3tpms, closecoupled centrifugal pump, b series, 1 hp, 230 volts, 1 phase, 1800 rpm, 3 npt discharge, cast iron impeller, mechanical seal. Mechanical seal installation location in pump a mechanical seal is installed on the. Every centrifugal pump must accommodate a spinning shaft while mechanically maintaining fluid or gas contained in the wet end of the pump. While this description is simple, it is a significant engineering challenge. Seal type the mechanical seal shown in the pump photograph is a type 1 mechanical seal. A few basic components and principles in mechanical seal design contribute to a working seal at the interface of the rotating shaft and stationary pumpmixersealchamber housing.
Sometimes operating conditions change to become quite different from the specific conditions for which the seal was intended. When the sealing is achieved by means of a mechanical seal, the chamber is. There are more complex designs with double, tandem or other arrangements which place a. The stationary part of the seal is fitted to the pump housing with a static seal this may be sealed with an oring or gasket clamped between the. Typically mechanical seals are installed on pumps and mixers. This document is intended to clarify what to expect on mechanical seals found in colfax products. Introduction to failures failure of the mechanical shaft seal is the most common cause of pump downtime. Internal structure of pump a pump is a machine that works to move fluids, as in lifting a liquid to its inside. Mechanical seal technology and selection eagleburgmann. It reduces leakage between the pump and the surroundings to an absolute minimum.
Seal end view piping plan layout what, why, and where pump crosssection mechanical seal preventative maintenance viewed from drive end shows preferred gland connection orientation illustrated schematic of auxiliary components describes piping plans, their purpose, and typical applications simplified centrifugal. Anthony 04547 pentair purex hydrotech l series p28280 pentair sta rite industries aj series u109 93ss pentair sta rite industries dura glas pre 1998 dura glas u109 93ss pentair sta rite industries max e glas pre 1998 u109 93ss pentair sta rite industries plbc series 17351 0102s. Goulds seal plus sp1 and sp2 are changing all that. In a single type mechanical seal pump, this liquid is normally the fluid being handled by the pump. The shaft seal is exposed to widely varying operating conditions. The mechanical seal type series 5kscb2 is available as single cartridge seal, single cartridge seal in quench design and double cartridge seal. The seals are classified as h, m or l according to load, with h and m indicating heavy load and l indicating light load.
The double mechanical seals can be provided by fristam in two different arrangements. Uxcell s14072500am4739 universal oil resistant water. From the company you trust for the best process pumps in the industry, look to goulds now for the most economical and reliable seal alternatives. Often, but not always, pumping systems contain a coupling, which attaches the driver to the rotary shaft of the pump. The manufacturer listings are alphabetical, refer to pages 7.