ventilation rate for a 1000sqft confined space

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ - (1) Hoods . Freely movable hoods intended to be placed by the welder as near as practicable to the work being welded and provided with a rate of airflow sufficient to maintain a velocity in the direction of the hood of 100 linear feet per minute in the zone of welding when the hood is at its most remote distance from the point of welding. The rates of ventilation required to accomplish this control velocity using a 3-inch wide flanged suction opening are shown in the following table: - (2) Fixed enclosure . A fixed enclosure with a top and not less than 2 sides which surround the welding or cutting operations and with a rate of airflow sufficient to maintain a velocity away from the welder of not less than 100 linear feet per minute. [Statutory Authority: RCW 49.17.010, .040, .050, and .060. 15-24-100 (Order 15-04), § 296-24-[redacted postal code], filed 12/01/2015, effective 01/05/2016. Order 73-5, 296-24-[redacted postal code], filed 5/9/73 and Order 73-4, 296-24-[redacted postal code], filed 5/7/73.] ## WAC 296-24-[redacted postal code] Ventilation in confined spaces. - (1) Air replacement . You must adequately vent all welding and cutting operations carried on in confined spaces to prevent the accumulation of toxic materials or possible oxygen deficiency. This applies not only to the welder but also to helpers and other personnel in the immediate vicinity. All air replacing that withdrawn must be clean and respirable. - (2) Airline respirators . In such circumstances where is not impossible to provide such ventilation, you must use airline respirators or hose masks approved for this purpose by the National Institute for Occupational Safety and Health (NIOSH) under 42 CFR Part 84. - (3) Self-contained units . In areas immediately hazardou…

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## Tending worker 56 (1) For every confined space or restricted space entry, an employer must designate a competent worker as a tending worker to be in communication with a worker in the confined space or restricted space. - 56 (2) An employer must ensure that a tending worker - (a) has a suitable system for summoning assistance, and - (b) is trained in the evacuation procedures referred to in section 55(3) and the emergency response plan referred to in section 115(1). 56 (3) An employer must ensure that, when a worker is present in a confined space, a tending worker is present outside the confined space at or near the entrance to the confined space, or at a remote monitoring station, if any of the following conditions are present or may be present in the confined space: - (a) the oxygen content of the atmosphere is less than 19.5 percent by volume; - (b) the oxygen content of the atmosphere is greater than 23.0 percent by volume; - (c) the concentration of a substance listed in Schedule 1, Table 2 is greater than 50 percent of its occupational exposure limit; - (d) a hazard other than one listed in clause (a), (b) or (c) is identified and the hazard cannot be eliminated or effectively controlled. - 56 (4) An employer must ensure that the tending worker under subsection (3) - (a) keeps track at all times of the number of workers inside the confined space, and - (b) is in constant communication with each worker inside the confined space. 56 (5) The tending worker under subsection (3) must not leave the area outside the confined space or the remote monitoring station until all workers have left the confined space or another tending worker is in place. 56 (6) If a remote monitoring station is used, an employer must ensure that the remote monitoring station - (a) is physically located at the same work site as the confined space being monitored, - (b) has a live visual display that allows the tending worker to have a clear, continuous and simultaneous view of - (i…

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- 49 (2) An employer must ensure that a worker does not enter a confined space unless adequate precautions are in place to protect a worker from drowning, engulfment or entrapment. - 49 (3) An employer must ensure that any hazardous energy in a restricted space is controlled in accordance with Part 15. AR 191/2021 s49;202/2024 ## Unauthorized entry - 50 An employer must ensure that persons who are not authorized by the employer to enter a confined space or a restricted space are prevented from entering. ## Traffic hazards - 51 An employer must ensure that workers in a confined space or a restricted space are protected from hazards created by traffic in the vicinity of the confined space or restricted space. ## Testing the atmosphere - 52 (1) Before a worker enters a confined space, an employer must ensure that the atmosphere in the confined space is tested by a competent worker to - (a) verify that the oxygen content is between 19.5 percent and 23.0 percent by volume, and - (b) identify the amount of toxic, flammable or explosive substance that may be present. - 52 (2) The employer must ensure that the testing required by subsection (1) is performed using calibrated test instruments appropriate for the atmosphere being tested and the instruments are used in accordance with the manufacturer's specifications. - 52 (3) The employer must ensure that as often as necessary after the first time a worker enters the confined space, a competent worker - (a) performs the tests specified in subsection (1), and - (b) identifies and records any additional hazards. - 52 (3.1) The employer must ensure that if there is a potential for the atmosphere to change unpredictably after a worker enters the confined space, the atmosphere is continuously monitored in accordance with subsection (2). - 52 (4) If tests identify additional hazards, the employer must deal with the identified hazards in accordance with this Code. - 52 (5) The employer must ensure that the procedures and prac…

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## Ventilation and purging - 53 (1) If the atmospheric testing under section 52 identifies that a hazardous atmosphere exists or is likely to exist in a confined space, an employer must ensure that the confined space is ventilated, purged or both before a worker enters the confined space. - 53 (2) If ventilating or purging a confined space is impractical or ineffective in eliminating a hazardous atmosphere, the employer must ensure that a worker who enters the confined space uses personal protective equipment appropriate for the conditions within the confined space. - 53 (3) If mechanical ventilation is needed to maintain a safe atmosphere in a confined space during the work process, an employer must ensure it is provided and operated as needed. - 53 (4) If mechanical ventilation is required to maintain a safe atmosphere in the confined space, the employer must ensure that - (a) the ventilation system incorporates a method of alerting workers to a failure of the system so that workers have sufficient time to safely leave the confined space, and - (b) all workers within the confined space have received training in the evacuation procedures to be used in the event of a ventilation system failure. - 53 (5) All workers must evacuate a confined space or use an alternative means of protection if a ventilation system fails. ## Inerting 54 (1) An employer must ensure that a confined space is inerted if it is not reasonably practicable to eliminate an explosive or flammable atmosphere within the confined space through another means. - 54 (2) If a confined space is inerted, an employer must ensure that - (a) every worker entering the confined space is equipped with supplied air respiratory protective equipment that complies with Part 18, - (b) all ignition sources are controlled, and - (c) the atmosphere within the confined space stays inerted while workers are inside. ## Emergency response - 55 (1) An employer must ensure that a worker does not enter or remain in a con…

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## S-15.1 REG 10 ## OCCUPATIONAL HEALTH AND SAFETY, 2020 ## Purging and ventilating of unsafe atmosphere - 18-8 (1) In addition to the requirements of section 25-11, if a concentration of a toxic, flammable or explosive substance is present or an oxygen enrichment or deficiency exists in a hazardous confined space, an employer shall ensure that the hazardous confined space is: - (a) purged and ventilated before a worker is allowed to enter the space, so that: - (i) any hazard associated with a toxic, flammable or explosive substance is reduced to the extent that is possible or eliminated; and - (ii) an oxygen content of not less than 19.5% and not more than 23% is ensured; and - (b) continuously ventilated at all times during which the worker occupies the hazardous confined space, to maintain a safe atmosphere. - (2) If ventilation is used to reduce or eliminate a hazard pursuant to subsection (1), an employer shall ensure that a competent person tests the atmosphere to determine that the confined space is safe for entry by a worker: - (a) before a worker enters the confined space; - (b) if all workers have vacated the confined space, before any worker re-enters the confined space; - (c) on the request of a worker who is required or permitted to enter the confined space; and - (d) continuously if any condition in the confined space may change and put the worker's health or safety at risk. 31 Dec 2020 c S-15.1 Reg 10 s18-8. ## Precautions if safe atmosphere not possible - 18-9 (1) If a hazardous confined space cannot be purged and ventilated to provide a safe atmosphere or a safe atmosphere cannot be maintained pursuant to section 18-8, an employer shall ensure that no work is carried on in the confined space except in accordance with the requirements of this section and section 25-11. - (2) An employer shall ensure that a competent person continuously monitors the atmosphere in a hazardous confined space. - (3) An employer shall ensure …

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space in which the atmosphere is not within acceptable limits. 2022-79 ## Exception re entry 2022-79 262.052 Despite section 262.051, an employer or a contractor may, if the hazard control measures identified in the code of practice are in place, permit an employee to enter or remain in a confined space in which the per -centage of oxygen is less than 19.5 % by volume. 2022-79 ## Testing atmosphere 2022-79 262.06 (1) Prior to an employee entering a confined space, an employer shall ensure that a competent person tests the atmosphere of the confined space, taking into consideration the stratification of air contaminants and oxygen to ensure that the atmosphere is within accepta -ble limits. 262.06 (2) The results of a test referred to in subsection (1), including the time and date the test was conducted, shall be documented and posted conspicuously at the en -trance to the confined space. 2022-79 ## Atmosphere within acceptable limits 2022-79 262.061 (1) The atmosphere of a confined space is within acceptable limits if - (a) the percentage of oxygen is not less than 19.5% by volume and not more than 23% by volume, - (b) the concentration of an air contaminant does not exceed 50% of the lower explosive limit or lower flammability limit of the air contaminant when the confined space work is cleaning or inspecting and does not create a source of ignition, - (c) the concentration of an air contaminant does not exceed 10% of the lower explosive limit or lower pace clos dont l'atmosphère n'est pas dans les limites ac -ceptables. 2022-79 ## Exception - entrée 2022-79 262.052 Par dérogation à l'article 262.051, l'em -ployeur ou l'entrepreneur peut permettre au salarié d'en -trer ou de demeurer dans un espace clos dont la teneur en oxygène est en volume de moins de 19,5 % si les me -sures de contrôle des dangers indiquées dans le code de directives pratiques sont en place. 2022-79 ## Vérificat…

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## S-15.1 REG 10 ## OCCUPATIONAL HEALTH AND SAFETY, 2020 - (c) to determine whether: - (i) work activities or processes will result in the release of toxic, flammable or explosive concentrations of any substances during the worker's occupation of the confined space; - (ii) measures have been taken to ensure that a worker will not drown or become entrapped in any liquid or free-flowing solid present in the confined space; - (iii) the entry of any liquid, free-flowing solid or hazardous substance into the confined space in a quantity that could endanger the health or safety of the worker has been prevented; - (iv) all energy sources that present a hazard to a worker entering into, exiting from or occupying the confined space have been locked out, with the energy sources being put in a zero energy state; - (v) any hazards from biological substances are present in the confined space; and - (vi) the opening for entry into and exit from the confined space is sufficient to allow safe passage of a worker who is using personal protective equipment required by these regulations. - (2) When testing the atmosphere of a confined space pursuant to clause (1) (b), a competent person shall use appropriate and properly calibrated instruments that have been tested to ensure that the instruments are capable of operating safely and effectively. - (3) A competent person who carries out the activities described in clauses (1) (a) to (c) shall prepare a report in writing that sets out: - (a) the results of the assessment, tests and determinations; - (b) recommended special precautions and procedures to reduce the risk to a worker that are to be followed by a worker entering into, exiting from or occupying the confined space; and - (c) recommended personal protective equipment to be used by a worker entering the confined space. 31 Dec 2020 c S-15.1 Reg 10 s18-5. ## Notice if no hazard found - 18-6 If a confined space is not identified as a hazar…

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## OCCUPATIONAL HEALTH AND SAFETY, 2020 - (c) alternative means to perform the work to be performed in a confined space that will not require the worker to enter the confined space; and - (d) alterations to the physical characteristics of the confined spaces that may be necessary to ensure safe entrance to and exit from all accessible parts of each confined space. 31 Dec 2020 c S-15.1 Reg 10 s18-2. ## Avoidance of entry into hazardous confined space - 18-3 (1) If reasonably practicable, an employer shall use an alternative means to perform work that will not require a worker to enter a hazardous confined space. - (2) An employer shall take all reasonably practicable steps to prevent any unauthorized entry into the confined space. 31 Dec 2020 c S-15.1 Reg 10 s18-3. ## Requirements before confined space is entered - 18-4 (1) If a worker will be required or permitted to work in a confined space, an employer, contractor or owner shall, before requiring or permitting the worker to enter the confined space: - (a) ensure that there is a safe entrance to and exit from all accessible parts of the confined space; and - (b) make all practicable alterations to the physical characteristics of the confined space necessary to ensure a safe entrance to and exit from all accessible parts of the confined space. - (2) In making alterations pursuant to clause (1) (b), an employer shall ensure that the structural integrity of the confined space is maintained. 31 Dec 2020 c S-15.1 Reg 10 s18-4. ## Requirements before hazardous confined space is entered - 18-5 (1) Before a worker is required or permitted to enter a confined space, an employer shall appoint a competent person: - (a) to assess the hazards; - (b) if a hazardous atmosphere has been identified, to test the atmosphere of the confined space for: - (i) oxygen enrichment or deficiency; - (ii) the presence of flammable or explosive substances; and - (iii) the presence and hazardous concentration of…

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- (c) prepare a procedure for the removal of a worker who has become injured or incapacitated while in the confined space; and - (d) ensure that the ventilation in the confined space is adequate to maintain safe atmospheric conditions. 31 Dec 2020 c S-15.1 Reg 10 s18-6. ## Entry plan - 18-7 (1) If a worker will be required or permitted to enter a hazardous confined space, an employer, in consultation with the committee, shall develop a hazardous confined space entry plan to ensure the health and safety of workers who enter or work in the hazardous confined space. - (2) A hazardous confined space entry plan must be in writing and must include: - (a) the tests or measurements necessary to monitor any oxygen deficiency or enrichment or the presence and hazardous concentration of flammable or explosive substances; - (b) the identification of any other hazards that may be present in the hazardous confined space and may put the health or safety of workers at risk; - (c) the means, if any, of isolating the hazardous confined space; - (d) the means, if any, of ventilating the hazardous confined space; - (e) the procedures to enter, work in and exit from the hazardous confined space safely; - (f) the availability, location and proper use of personal protective equipment; - (g) the rescue procedures to be followed, including the number and duties of personnel and the availability, location and proper use of equipment; - (h) the means to maintain effective communication with a worker who has entered the hazardous confined space; and - (i) the availability, location and proper use of any other equipment that a worker may need to work safely in the hazardous confined space. - (3) An employer shall ensure that the following workers are trained in and implement a hazardous confined space entry plan: - (a) a worker who is required or permitted to enter the hazardous confined space; - (b) a worker who attends a worker in the hazardous confined space pursuant…